Article: 97408 of rec.radio.amateur.homebrew From: NudoSmasher Subject: Re: REALISTIC DX-302 HAM-SHORTWAVE RECEIVER-MINT-$150 Date: Sat, 13 May 2006 07:01:11 -0700 Message-ID: References: <35ta62dep5v9egl3sior4v1jo6mf7nnpc1@4ax.com> On 12 May 2006 at 09:09:07 -700, "Charlie Nudo" spammed: http://cgi.ebay STOP THIS SPAMMER! Google Groupers: Click on "Show Options," click on "Show Original," cut and paste the whole message including headers, and send in a spam complaint to: groups-abuse"AT"google.com abuse"AT"epix.net spam"AT"ebay.com (Spammer's eBay account is "66fourdoor") This spammer shows up under various trash (MAPI) email accounts: trippin28track"AT"yahoo.com winchester1886"AT"hotmail.com nativebrookie"AT"hotmail.com Due to Google Groups shutting down some of his other MAPI accounts, the fool is now also spamming from his own POP3 accounts: analog"AT"epix.net bb69"AT"epix.net His home ISP is Epix. His main POP3 account is thenudofamily"AT"epix.net. ALL his spam eminates from Epix IP blocks. Those using real newsreaders will already know what to do with this spamming pest and eBay fraudster. His spam posts are a violation of eBay's Terms of Service pertaining to Usenet Policy. Be sure to include that in your report to eBay. Article: 97409 of rec.radio.amateur.homebrew From: "Runge" References: <35ta62dep5v9egl3sior4v1jo6mf7nnpc1@4ax.com> Subject: Re: REALISTIC DX-302 HAM-SHORTWAVE RECEIVER-MINT-$150 Date: Sat, 13 May 2006 17:28:55 +0200 Message-ID: <4465fa8e$0$21282$8fcfb975@news.wanadoo.fr> Duh "NudoSmasher" a écrit dans le message de news: ljpb629d65hcvh28575f1ho1c3cfb6v2iq@4ax.com... > On 12 May 2006 at 09:09:07 -700, "Charlie Nudo" > spammed: > > http://cgi.ebay > > STOP THIS SPAMMER! > > Google Groupers: > > Click on "Show Options," click on "Show Original," cut and paste the > whole message including headers, and send in a spam complaint to: > > groups-abuse"AT"google.com > abuse"AT"epix.net > spam"AT"ebay.com (Spammer's eBay account is "66fourdoor") > > This spammer shows up under various trash (MAPI) email accounts: > > trippin28track"AT"yahoo.com > winchester1886"AT"hotmail.com > nativebrookie"AT"hotmail.com > > Due to Google Groups shutting down some of his other MAPI accounts, > the fool is now also spamming from his own POP3 accounts: > > analog"AT"epix.net > bb69"AT"epix.net > > His home ISP is Epix. His main POP3 account is > thenudofamily"AT"epix.net. ALL his spam eminates from Epix IP blocks. > > Those using real newsreaders will already know what to do with this > spamming pest and eBay fraudster. His spam posts are a violation of > eBay's Terms of Service pertaining to Usenet Policy. Be sure to > include that in your report to eBay. Article: 97410 of rec.radio.amateur.homebrew From: mb500sec-NOSPAM-@hot-ten-tot-not-mail.com (Willem) Subject: Re: SPRING SALE-SW/HAM RADIO-PA SYSTEM AMP-TAPES-ANTIQUES-LP'S-MORE-$$$$$$$$$$$$ Date: Sat, 13 May 2006 21:13:48 GMT Message-ID: <44664b9d.211907703@news.xs4all.nl> References: <35ta62dep5v9egl3sior4v1jo6mf7nnpc1@4ax.com> <4465fa8e$0$21282$8fcfb975@news.wanadoo.fr> <1147537375.398284.102060@i39g2000cwa.googlegroups.com> On 13 May 2006 09:22:55 -0700, "Fatts Proffitt" wrote: >http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZ66fourdoor SPRING SALE-SW/HAM RADIO-PA SYSTEM AMP-TAPES Ja dat zeg ik, Donderdagavond 18 mei is er weer de voorjaarsverkoping van de afdeling Den Haag. Willem > Article: 97411 of rec.radio.amateur.homebrew From: Roy L. Fuchs Subject: Re: FA KEITHLEY 610C ELECTROMETER, PICO AMMETER COULOMB METER Plus Message-ID: References: <8659g.23076$mX1.20976@newsfe2-gui.ntli.net> Date: Sun, 14 May 2006 19:12:35 GMT On Fri, 12 May 2006 19:12:04 GMT, Gave us: >FA KEITHLEY You posted to only ONE correct group. The posts in the rest of the groups are all SPAM, asshole. Article: 97412 of rec.radio.amateur.homebrew From: "Uncle Pete" References: <1147241561.722283.227940@g10g2000cwb.googlegroups.com> <1147275863.902102.8480@j73g2000cwa.googlegroups.com> <1147415104.249154.15630@j33g2000cwa.googlegroups.com> <1268ioekr9pcl8b@corp.supernews.com> <1147431611.429264.160840@i39g2000cwa.googlegroups.com> Subject: Re: VFO output power Message-ID: Date: Sun, 14 May 2006 21:40:53 -0400 wrote in message news:1147431611.429264.160840@i39g2000cwa.googlegroups.com... > Should I add a low pass chebyshev filter between VFO and mixer? > I mean - does it give real benefit (or only in theory)? > Put it before any attenuator to keep the port broadly terminated at 50 ohms. Pete Article: 97413 of rec.radio.amateur.homebrew From: Jeffrey D Angus Subject: Re: japanese kit radio References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> Message-ID: Date: Mon, 15 May 2006 01:44:50 GMT Use http://babelfish.altavista.com/babelfish/tr To get a sort of english translation of that page. It is rather fascinating. Jeff cornytheclown@hotmail.com wrote: > Thought some here might like seeing this. > > modern japanese science kit of a tube radio....looks neat.....book > condenser, three miniature tubes..loop antenna with what looks like > cloth wire..... > > http://shop.gakken.co.jp/otonanokagaku/vol18.html > -- RESTRICTED AREA. Anyone intruding shall immediately become subject to the jurisdiction of military law. Intruders will be subject to lethal force, without warning, and on sight. USE OF DEADLY FORCE IS AUTHORIZED under the Internal Security Act of 1950. Article: 97414 of rec.radio.amateur.homebrew From: Roy L. Fuchs Subject: Re: FA KEITHLEY 610C ELECTROMETER, PICO AMMETER COULOMB METER Plus Message-ID: References: <8659g.23076$mX1.20976@newsfe2-gui.ntli.net> <-5GdndVPALJIOfrZnZ2dnUVZ_vqdnZ2d@comcast.com> Date: Mon, 15 May 2006 02:14:42 GMT On Sun, 14 May 2006 17:44:51 -0400, "Ross Mac" Gave us: > >"Roy L. Fuchs" wrote in message >news:l70f62pu6h880c700hb0lghjn9moindili@4ax.com... >> On Fri, 12 May 2006 19:12:04 GMT, Gave us: >> >>>FA KEITHLEY >> >> You posted to only ONE correct group. The posts in the rest of the >> groups are all SPAM, asshole. > >Wrong again Dimbulb...do your homework..... > Not in school, you stupid fucktard. Article: 97415 of rec.radio.amateur.homebrew From: "Gary Tayman" References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> Subject: Re: japanese kit radio Message-ID: <2LR9g.4669$UY6.2171@trnddc08> Date: Mon, 15 May 2006 02:32:30 GMT It definitely beats the heck out of that "genuine" Atwater-Kent breadboard radio with miniature tubes that was posted on eBay a few months ago. For one thing it has a speaker. I can't read Japanese, and don't want to install one of those language programs, but it appears to be sold as just what it is -- a cute kit. For the tinkerer, it can make for a neat little radio that can be a conversation piece in the corner of any living room or office. -- Gary E. Tayman/Tayman Electrical Sound Solutions For Classic Cars http://www.taymanelectrical.com wrote in message news:1147656585.645561.130290@j73g2000cwa.googlegroups.com... > Thought some here might like seeing this. > > modern japanese science kit of a tube radio....looks neat.....book > condenser, three miniature tubes..loop antenna with what looks like > cloth wire..... > > http://shop.gakken.co.jp/otonanokagaku/vol18.html > Article: 97416 of rec.radio.amateur.homebrew From: biascomms Subject: Re: japanese kit radio References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <2LR9g.4669$UY6.2171@trnddc08> Message-ID: Date: Mon, 15 May 2006 06:12:42 GMT Gary Tayman wrote: > I can't read Japanese, and don't want to install one of those language > programs, You don't need to /install/ anything - "babelfish" just redirects the page you want translated to another web site that does the translation, then displays it in your browser just like any other web page. It's one of the most sophisticated web applications, but the translations (obviously) aren't perfect, and can sometimes be hilarious! Bob -- Everything gets easier with practice, except getting up in the morning! Article: 97417 of rec.radio.amateur.homebrew From: - exray - Subject: Re: japanese kit radio Date: Mon, 15 May 2006 03:01:55 -0400 Message-ID: <126g9rbc134ju53@corp.supernews.com> References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> cornytheclown@hotmail.com wrote: > Thought some here might like seeing this. > > modern japanese science kit of a tube radio....looks neat.....book > condenser, three miniature tubes..loop antenna with what looks like > cloth wire..... > > http://shop.gakken.co.jp/otonanokagaku/vol18.html > Dietary Fiber-challenged "Ron" will probably make his soup out of my shorts again but I homebrewed my own version of this set sans anything made of plastic or the weenie 20-25cm loop and phony horn. These sets are available on ebay and not so bad a bargain for a guy that wants to build a set but not go chasing around for individual components. You can find the schematic and details on other ebay listings. There's some yakk on ARF for those wanting to investigate deeper. Its further evidence of my "blue butchering period" of fake tubes like the Radio LL :) Its a cute little receiver - nothing to write home about and struggles to drive a horn, fake or otherwise, on anything but locals. Maybe over-represented in that regard. Toss the horn and use phones and its quite respectable for 'radio' person. http://www.sparkbench.com/gekken/gekken.html Its a clean sounding rig and shouldn't be any disappointment in its price class unless you compare it to an old plastic $5 clock radio. Its the kit that counts! -Bill ( the Butcher) Article: 97418 of rec.radio.amateur.homebrew From: Jeffrey D Angus Subject: Re: japanese kit radio References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> Message-ID: Date: Mon, 15 May 2006 07:23:53 GMT - exray - wrote: > I homebrewed my own version of this set > > http://www.sparkbench.com/gekken/gekken.html You tease... Where's the schematic? Jeff -- RESTRICTED AREA. Anyone intruding shall immediately become subject to the jurisdiction of military law. Intruders will be subject to lethal force, without warning, and on sight. USE OF DEADLY FORCE IS AUTHORIZED under the Internal Security Act of 1950. Article: 97419 of rec.radio.amateur.homebrew From: Jeffrey D Angus Subject: Re: japanese kit radio References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> <1147677079.106354.289410@v46g2000cwv.googlegroups.com> Message-ID: <73W9g.3259$uM4.2179@tornado.socal.rr.com> Date: Mon, 15 May 2006 07:26:59 GMT Steven wrote: > How about if I patch my halli into my 120 watt Pioneer that "looks" > like a Icom, Drake or Yaesu? That's twice now you've posted that link. I doesn't look anything at all like an Icom or Yaesu. And most certainly not like a Drake. If anything, it looks like an over priced midrange consumer radio from the 80s. Which it is. Jeff -- RESTRICTED AREA. Anyone intruding shall immediately become subject to the jurisdiction of military law. Intruders will be subject to lethal force, without warning, and on sight. USE OF DEADLY FORCE IS AUTHORIZED under the Internal Security Act of 1950. Article: 97420 of rec.radio.amateur.homebrew From: - exray - Subject: Re: japanese kit radio Date: Mon, 15 May 2006 04:05:57 -0400 Message-ID: <126gdjb5ge3i5f@corp.supernews.com> References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> Jeffrey D Angus wrote: > - exray - wrote: > >> I homebrewed my own version of this set >> >> http://www.sparkbench.com/gekken/gekken.html > > > You tease... Where's the schematic? > > Jeff > How's this? http://www.sparkbench.com/gekken/gekken.gif -Bill Article: 97421 of rec.radio.amateur.homebrew From: Jeffrey D Angus Subject: Re: japanese kit radio References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> <126gdjb5ge3i5f@corp.supernews.com> Message-ID: Date: Mon, 15 May 2006 12:45:41 GMT - exray - wrote: > How's this? > http://www.sparkbench.com/gekken/gekken.gif > > -Bill Thankies Mr. Bill. Jeff -- RESTRICTED AREA. Anyone intruding shall immediately become subject to the jurisdiction of military law. Intruders will be subject to lethal force, without warning, and on sight. USE OF DEADLY FORCE IS AUTHORIZED under the Internal Security Act of 1950. Article: 97422 of rec.radio.amateur.homebrew From: "Brian Hill" References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> Subject: Re: japanese kit radio Message-ID: Date: Mon, 15 May 2006 07:49:34 -0500 "- exray -" wrote in message news:126g9rbc134ju53@corp.supernews.com... > cornytheclown@hotmail.com wrote: > >> Thought some here might like seeing this. >> >> modern japanese science kit of a tube radio....looks neat.....book >> condenser, three miniature tubes..loop antenna with what looks like >> cloth wire..... >> >> http://shop.gakken.co.jp/otonanokagaku/vol18.html >> I like your version of the peanut tube Bill. They got a little of that Arcturus sheen to em too. Cool!! -- Regards B.H. Brian's Basement http://webpages.charter.net/brianhill/6.htm Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm Article: 97423 of rec.radio.amateur.homebrew From: - exray - Subject: Re: japanese kit radio Date: Mon, 15 May 2006 11:50:47 -0400 Message-ID: <126h8qta39f393@corp.supernews.com> References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> John Byrns wrote: > > What is "ARF", I hope it's not one of those alternative forums? > > > Regards, > > John Byrns http://antiqueradios.com/forums/ Article: 97424 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: japanese kit radio Date: 15 May 2006 16:05:03 GMT Message-ID: References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> <126gdjb5ge3i5f@corp.supernews.com> On Mon, 15 May 2006 12:45:41 GMT, Jeffrey D Angus wrote: > - exray - wrote: >> How's this? >> http://www.sparkbench.com/gekken/gekken.gif >> > > Thankies Mr. Bill. I really miss the Olde Tyme Wireless Apparatus where you ran the B+ through the earphones!! :-) Jonesy -- Marvin L Jones | jonz | W3DHJ | linux 38.24N 104.55W | @ config.com | Jonesy | OS/2 *** Killfiling google posts: Article: 97425 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: japanese kit radio Date: 16 May 2006 02:44:04 GMT Message-ID: References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <126g9rbc134ju53@corp.supernews.com> ["Followup-To:" header set to rec.radio.amateur.homebrew.] On Mon, 15 May 2006 20:09:09 -0600, Warren Weber wrote: > "- exray -" wrote in message > news:126g9rbc134ju53@corp.supernews.com... >> cornytheclown@hotmail.com wrote: >> >>> Thought some here might like seeing this. >>> >>> modern japanese science kit of a tube radio....looks neat.....book >>> condenser, three miniature tubes..loop antenna with what looks like >>> cloth wire..... >>> >>> http://shop.gakken.co.jp/otonanokagaku/vol18.html >> >> Dietary Fiber-challenged "Ron" will probably make his soup out of my >> shorts again but I homebrewed my own version of this set sans anything >> made of plastic or the weenie 20-25cm loop and phony horn. These sets are >> available on ebay and not so bad a bargain for a guy that wants to build a >> set but not go chasing around for individual components. You can find the >> schematic and details on other ebay listings. There's some yakk on ARF for >> those wanting to investigate deeper. >> Its further evidence of my "blue butchering period" of fake tubes like the >> Radio LL :) >> Its a cute little receiver - nothing to write home about and struggles to >> drive a horn, fake or otherwise, on anything but locals. Maybe >> over-represented in that regard. Toss the horn and use phones and its >> quite respectable for 'radio' person. >> http://www.sparkbench.com/gekken/gekken.html >> Its a clean sounding rig and shouldn't be any disappointment in its price >> class unless you compare it to an old plastic $5 clock radio. Its the kit >> that counts! > > Beautiful workmanship. My stuff won't look that good because I am "A non > practicing perfectionist." Warren Beautiful photography, too! FB OM!! 73 Jonesy -- Marvin L Jones | jonz | W3DHJ | linux 38.24N 104.55W | @ config.com | Jonesy | OS/2 *** Killfiling google posts: Article: 97426 of rec.radio.amateur.homebrew From: Allisonnospam@nouce.bellatlantic.net Subject: Re: low pass filter between vfo and mixer Message-ID: References: <1147772607.946164.5780@j55g2000cwa.googlegroups.com> Date: Tue, 16 May 2006 11:58:04 GMT On 16 May 2006 02:43:28 -0700, aadu.adok@gmail.com wrote: >hi, > >I have chosen the IF frequency to be 8mhz (since I have crystals for >that freq) in my superhet project. So, VFO frequencies should be: > >band (mhz) VFO (mhz) >---------------- --------------- >1.8 9.8 >3.5 11.5 >7.0 15.0 >14.0 6.0 >21.0 13.0 >28.0 20.0 > >Well..now here is a question: can I use single chebyshev low-pass >filter for all those frequencies? Or maybe it's better to use different >filters with different cut-off frequencies? > >thanks! Different filters, as the frequency span is more than 2:1. You can get by with three if those are the lowest frequecies. 6, 9.8 filter 1 11.5, 13, 15, filter 2 20 filter 3 Myself I'd do four: 6 as filter 1 9.8 filter 2 11.5, 13, 15, filter 3 20 filter 4 One thing I notice is the VFO frequencies. With great care will the VFO drift above 10mhz be acceptable for SSB or CW. A premix scheme with a VFO at some convenient frequency like 5mhz and mixed with a crystal osc for an injection frequency. For a schedule like this: >band (mhz) VFO (mhz) >---------------- --------------- >1.8 9.8 >3.5 11.5 >7.0 15.0 >14.0 22.0 >21.0 29.0 >28.0 36.0 That would need different filters but the tuning would be the same for each band and getting a 5mhz vfo to stay put is far easier than a bandswitched VFO. Also spurs are more likely if the LO injection is below the IF than above. Allison Article: 97427 of rec.radio.amateur.homebrew From: - exray - Subject: Re: japanese kit radio Date: Tue, 16 May 2006 08:09:05 -0400 Message-ID: <126jg72pqfdp9f8@corp.supernews.com> References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> <1147760777.223576.272860@u72g2000cwu.googlegroups.com> cornytheclown@hotmail.com wrote: > Thanks for the babelfish link..thats pretty neat too. > > Anyhow I just thought this kit is kinda neat...dont see something like > this everyday...only things close usually have a cassette player or cd > player jammed into them...and no tubes.... I bet it is all plastic > too....the base, the horn everything... > > 150.00 USD on ebay ~:>....kinda steep..... if they were 30 bucks I'd > buy one just to get an up close look at it. These can be purchased directly from Gakken for about $100 with direct express shipping from JA. It is all plastic. -Bill Article: 97428 of rec.radio.amateur.homebrew From: "Theo" References: <1147656585.645561.130290@j73g2000cwa.googlegroups.com> Subject: Re: japanese kit radio Message-ID: Date: Tue, 16 May 2006 16:10:23 GMT "Driving 006P9V with 45V which 5 these series is done.!" Don't ye jest lurve those Japanese - English translations! Article: 97429 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: TCXO Substitution? Date: Tue, 16 May 2006 12:49:33 -0400 Message-ID: References: <1147373350.498396.182210@i39g2000cwa.googlegroups.com> In article <1147373350.498396.182210@i39g2000cwa.googlegroups.com>, KC2PIH@gmail.com wrote: > I have been searching for a Kenwood SO-1 temperature compensated > crystal oscillator for the last 4 years. When I did find them (eBay), > they went for a fortune because I must not be the only looking for one. > I believe the SO-1 runs at 20Mhz...are there other units that could be > substituted? I believe the Kenwood SO-2, with also runs at 20Mhz, is > still available. Can the SO-2 be wired in place of the SO-1? Or is > there more to it than that? Scott- You can probably find service manuals on the web for rigs that use each version. It should be possible to get an idea how the footprints compare, what voltages are used and how similar are the loads. It may be possible to find another company's TCXO that could be adapted, but it may be just as easy to adapt the SO-2. Your best bet may be to contact Kenwood's engineering department. It is conceivable that the two might be the same, but the SO-2 has better specs. It is also possible that there is a version available from Kenwood parts, identical to the SO-1, but used in their commercial radios. Incidentally, if you do find an SO-1, the label can be peeled back to reveal a trimmer capacitor behind a hole under the "e" in Kenwood. I adjusted mine so the 20 MHz WWV audio tone is the same on USB and LSB. It is also possible to setup A and B vfos for 19.999 MHz USB and 20.001 MHz LSB, and adjust the trimmer so the 1 KHz beat notes are the same. Either way, you need a "musical ear" to be sure the two tones are the same! 73, Fred, K4DII Article: 97430 of rec.radio.amateur.homebrew From: Roy L. Fuchs Subject: Re: FA KEITHLEY 610C ELECTROMETER, PICO AMMETER COULOMB METER Plus Message-ID: <0rhl629t40if5hih8t7hm85gn5s5h44qei@4ax.com> References: <8659g.23076$mX1.20976@newsfe2-gui.ntli.net> <-5GdndVPALJIOfrZnZ2dnUVZ_vqdnZ2d@comcast.com> Date: Wed, 17 May 2006 06:51:54 GMT On Mon, 15 May 2006 19:42:38 -0400, "Ross Mac" Gave us: > >"Roy L. Fuchs" wrote in message >news:gvof629spp34fho2k68kvv340b0memcg0r@4ax.com... >> On Sun, 14 May 2006 17:44:51 -0400, "Ross Mac" >> Gave us: >> >>> >>>"Roy L. Fuchs" wrote in message >>>news:l70f62pu6h880c700hb0lghjn9moindili@4ax.com... >>>> On Fri, 12 May 2006 19:12:04 GMT, Gave us: >>>> >>>>>FA KEITHLEY >>>> >>>> You posted to only ONE correct group. The posts in the rest of the >>>> groups are all SPAM, asshole. >>> >>>Wrong again Dimbulb...do your homework..... >>> >> Not in school, you stupid fucktard. > >Oh...you must be...you use schoolyard lingo! You wouldn't know. You're just an old alzheimeristic twit. >That's the best you can do Hey Dimbulb? My worst is two orders of magnitude better than your best. >Wrong and wrong again....what else is new.... You should stop talking about yourself. >Big on mouth and small on brains..... > You're an idiot. That is quite succinct. This is a text forum, you retarded bastard. There are no mouths here, dumbfuck. Article: 97431 of rec.radio.amateur.homebrew From: Paul Keinanen Subject: Re: low pass filter between vfo and mixer Message-ID: <64il621hqtjo45ikibb3ljjm97mef39keh@4ax.com> References: <1147772607.946164.5780@j55g2000cwa.googlegroups.com> Date: Wed, 17 May 2006 11:31:26 +0300 On 16 May 2006 02:43:28 -0700, aadu.adok@gmail.com wrote: >I have chosen the IF frequency to be 8mhz (since I have crystals for >that freq) in my superhet project. So, VFO frequencies should be: > >band (mhz) VFO (mhz) >---------------- --------------- >1.8 9.8 >3.5 11.5 >7.0 15.0 >14.0 6.0 >21.0 13.0 >28.0 20.0 > >Well..now here is a question: can I use single chebyshev low-pass >filter for all those frequencies? Or maybe it's better to use different >filters with different cut-off frequencies? Unless you are using a true multiplicative (four quadrant multiplier) as a mixer, i do not see why you would want to put a low pass filter between the VFO and the mixer. However, if you are using some switching type double balanced mixer, such as diode ring or hard driven Gilbert cell (such as MC1496, NE602 etc.) mixer, these should be driven with a clean symmetric square wave to ensure accurate switching. A symmetric square wave contains a rich series of odd harmonics that could mix with the signals in the antenna. With the VFO at 6 MHz and 8 MHz IF, the third LO harmonic would be at 18 MHz, forming spurious responses at 18+8=26 MHz and 18-8=10 MHz, the 5th harmonic would produce other spurious responses. Since you are apparently not designing a general coverage receiver, but a ham band only receiver, IMHO, it is a much better idea to put the effort to build filters into the front end (e.g. band pass filters for each ham band or a constantly tunable filter) ahead of the mixer. In the example above, the 14,0-14,35 MHz front end band pass filter would strongly attenuate the spurious responses at 10 and 26 MHz. While there would still be mixing products with the harmonics of the local oscillator, with proper input filtering, the RF port of the mixer would only contain some thermal noise from the input stage(s), which at HF would not be an issue. As others have pointed out, your VFO frequencies are quite high and would ruin the stability. Also running the VFO below the received frequency can easily cause harmonics to fall on the RF passband or IF frequency. For local oscillator frequency stability you might have to use the mixing method (band crystal +/- VFO) or the offset-PLL method (VCO-VFO) / divide-by-N and phase comparator. In both cases you should check that none of the auxiliary frequencies (band crystal, VFO, VCO, VCO-VFO difference, PLL reference crystal or PLL reference frequency) or their harmonics fall on the input frequency band or the IF frequency. With a limited coverage receiver this should not be too hard to do. Put all the generated frequencies and their harmonics into a spreadsheet and check for several points on that band that all spurious signals are outside the ham band under investigation and that these frequencies do not come too close to the IF bandwidth. Even if you do not currently plan to implement the WARC bands, it would be a good idea to include them in this spreadsheet analysis, in case you sometimes would want to implement them too. Paul OH3LWR Article: 97432 of rec.radio.amateur.homebrew From: Allisonnospam@nouce.bellatlantic.net Subject: Re: low pass filter between vfo and mixer Message-ID: <7u2m62pjphnjn2ssir971lblvj2cbuscim@4ax.com> References: <1147772607.946164.5780@j55g2000cwa.googlegroups.com> <1147861488.283237.283690@38g2000cwa.googlegroups.com> Date: Wed, 17 May 2006 11:43:00 GMT On 17 May 2006 03:24:48 -0700, aadu.adok@gmail.com wrote: >I like the idea of having 5-5.5 mhz VFO (for all bands) mixed with band >crystal. >Lets take 40m band as an example: > >I still must provide 15mhz to mixer (15 LO - 7 RF = 8 IF). Right?! Yes. >Now - how to produce 15 mhz from 5 mhz VFO and band crystal osc? >Obviously I need to add another mixer and feed its input ports with 5 >mhz from VFO and 10 mhz from crystal osc. This new mixer would have 15 >and 5 mhz at its output. Right? Yes, use a DBM for less undesired products. If done with medium care you can expect the undesired outputs to be 30 to 40 db down from the sum and difference products. Makes filtering much easier. >Now..how to block 5 mhz and let 15 mhz go through towards my existing >RF/VFO mixer? > >Obviously low-pass is not an option here.. Correct. You will need to use band pass filters. Allison > >thanks guys! Article: 97433 of rec.radio.amateur.homebrew From: Allisonnospam@nouce.bellatlantic.net Subject: Re: low pass filter between vfo and mixer Message-ID: References: <1147772607.946164.5780@j55g2000cwa.googlegroups.com> <64il621hqtjo45ikibb3ljjm97mef39keh@4ax.com> Date: Wed, 17 May 2006 11:53:40 GMT On Wed, 17 May 2006 11:31:26 +0300, Paul Keinanen wrote: >On 16 May 2006 02:43:28 -0700, aadu.adok@gmail.com wrote: > >>I have chosen the IF frequency to be 8mhz (since I have crystals for >>that freq) in my superhet project. So, VFO frequencies should be: >> >>band (mhz) VFO (mhz) >>---------------- --------------- >>1.8 9.8 >>3.5 11.5 >>7.0 15.0 >>14.0 6.0 >>21.0 13.0 >>28.0 20.0 >> >>Well..now here is a question: can I use single chebyshev low-pass >>filter for all those frequencies? Or maybe it's better to use different >>filters with different cut-off frequencies? > >Unless you are using a true multiplicative (four quadrant multiplier) >as a mixer, i do not see why you would want to put a low pass filter >between the VFO and the mixer. > >However, if you are using some switching type double balanced mixer, >such as diode ring or hard driven Gilbert cell (such as MC1496, NE602 >etc.) mixer, these should be driven with a clean symmetric square wave >to ensure accurate switching. If your using a DBM while a perfet square wave would be good the use of a low pass filter achieves the same result with less effort. By removing any higher order harmonics the wave form will be a symetric sine wave (to resistive load) and a symetric clipped square wave to a DBM. > >A symmetric square wave contains a rich series of odd harmonics that >could mix with the signals in the antenna. With the VFO at 6 MHz and 8 >MHz IF, the third LO harmonic would be at 18 MHz, forming spurious >responses at 18+8=26 MHz and 18-8=10 MHz, the 5th harmonic would >produce other spurious responses. Exactly. However with good reciever design you strip images and out of band signals. You can't mix with whats not there. >Since you are apparently not designing a general coverage receiver, >but a ham band only receiver, IMHO, it is a much better idea to put >the effort to build filters into the front end (e.g. band pass filters >for each ham band or a constantly tunable filter) ahead of the mixer. >In the example above, the 14,0-14,35 MHz front end band pass filter >would strongly attenuate the spurious responses at 10 and 26 MHz. >While there would still be mixing products with the harmonics of the >local oscillator, with proper input filtering, the RF port of the >mixer would only contain some thermal noise from the input stage(s), >which at HF would not be an issue. Image stripping. The trick here is adaquate band pass and minimum loss unless your using an RF amp ahead of it. >As others have pointed out, your VFO frequencies are quite high and >would ruin the stability. Also running the VFO below the received >frequency can easily cause harmonics to fall on the RF passband or IF >frequency. > >For local oscillator frequency stability you might have to use the >mixing method (band crystal +/- VFO) or the offset-PLL method >(VCO-VFO) / divide-by-N and phase comparator. In both cases you should >check that none of the auxiliary frequencies (band crystal, VFO, VCO, >VCO-VFO difference, PLL reference crystal or PLL reference frequency) >or their harmonics fall on the input frequency band or the IF >frequency. Tracking PLL is a good way to go if your goal is to reduce the amout of switching of filters. These can be fairly simple and straightforward. The handbook, QST and EMDRF have good designs that are reproducable. The downside is offset PLLs have phase noise and it increases with the /n and they can be complex. Unless in kit form and stock design I don't advise them for novice builders unless they are willing to experiment, alot. >With a limited coverage receiver this should not be too hard to do. >Put all the generated frequencies and their harmonics into a >spreadsheet and check for several points on that band that all >spurious signals are outside the ham band under investigation and that >these frequencies do not come too close to the IF bandwidth. Find SPURTUNE on the net. >Even if you do not currently plan to implement the WARC bands, it >would be a good idea to include them in this spreadsheet analysis, in >case you sometimes would want to implement them too. ! Good idea! Allison > >Paul OH3LWR > Article: 97434 of rec.radio.amateur.homebrew Subject: ** FLEA at MIT ** Sunday May 21st Cambridge MA From: w1gsl@mit.edu (Steven L. Finberg) Date: 17 May 2006 22:17:46 GMT Message-ID: <446ba10a$0$568$b45e6eb0@senator-bedfellow.mit.edu> This comming Sunday... +++ Now even more Buyers Parking !!! Thanks to TKT we have use of their new parking lot across Albany St from the SWAPFEST !!! !! ** More Buyers PARKING is available ** for details see http://web.mit.edu/w1gsl/Public/flyer *** !!!! In our Traditional GARAGE and the adjacent lot !!!! **** so come rain or shine or super heat the Flea is on !!! ********* $1 buyers discount with hardcopy of this notice ******** COMPUTERS - ELECTRONICS - HAM RADIO - COMPUTERS - ELECTRONICS - HAM RADIO FLEA all SUMMER at MIT Sunday May 21st 2006 9AM-2PM Come to the city for a great flea - plenty of free parking. MIT's electronics and ham radio flea will take place on the third Sunday of each month this summer, April thru October. There is tailgate space for over 600 sellers and free, off-street parking for >2000 cars! Buyers admission is $5 (you get $1 off if you're lucky enough to have a copy of our ad) and sellers spaces are $20 for the first and $15 for each additional at the gate. The flea will be held at the corner of Albany and Main streets in Cambridge; right in the Kendall Square area from 9AM to 2PM, with sellers set-up time starting at 7AM. SEASON PASS + Advance Seller Discount A sellers discount season pass is available which offers a 30% discount. By prepaying you get a discount and earlier admission. See the registration form. *** Attention Sellers *** Prepaid vendors.. Season Pass or monthly, will be admitted FIRST. Separate lines will form prior to gate opening for prepaid and nonprepaid vendors !! RAIN or SHINE !! Have no fear of rain, a covered well illuminated tailgate area is available for all sellers (6'8" clearance). Talk-in: 145.23- (PL 88.5) W1BOS/R and W1XM/R-449.725/444.725 (PL 114.8/2A). Sponsors: MIT Electronics Research Society MIT UHF Repeater Association (W1XM) MIT Radio Society (W1MX) Harvard Wireless Club (W1AF) For more info / advanced reservations 617 253 3776 ********** $1 buyers discount with hard copy of this notice ************ <<<<<<<<<<<<<<<<<<<<<<<< cut here >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Mail the coupon below by the 5th of the month to be a Prepaid Vendor. FLEA at MIT 2006 Rates SELLERS To use your prepaid spaces the named vendor MUST be present. Rates include one admission per space. Season Pass $99 First Space includes all 7 2006 meets $70 each additional Space Must be received by April 16th Advance $17 First space $12 Additional Spaces Must be received by the 5th of the month. Gate Admission $20 First Space $15 Additional Spaces Admission is after the prepaid vendors Early Bird Buyer -Admission after the prepaid vendor line is admitted. ~ 7:15AM ** You may not sell. ** $15 per person at the gate. ****************************** cut here ******************************* FLEA at MIT 2006 Advance Space Application ____April ____May ____June ____ July ____Aug ___Sept ____Oct @ $17 for the first each month + $12 each additional ____ Season Pass @$99 _____ Additional Season Spaces @$70 Name ________________________ Call __________ $ Included______ Address ________________________ Phone __________ Make Check to The MIT Radio Society City ____________________ State _______ Zip _______ PO Box 397082 Cambridge MA 02139 E-mail _____________________________________________ ******************************************************************************* Steve Finberg W1GSL w1gsl@mit.edu PO Box 82 MIT Br Cambridge MA 02139-7082 617 258 3754 ******************************************************************************* Article: 97435 of rec.radio.amateur.homebrew From: "Gary McIsaac" Subject: Thank god for this Message-ID: Date: Wed, 17 May 2006 22:56:33 GMT Hi everyone Just a quick message, does anyone actually read this news thing if so I would be glad to know why. Is there anyone out there? Thanks Gary Article: 97436 of rec.radio.amateur.homebrew From: "Gary McIsaac" Subject: So Granny got the Jail Message-ID: Date: Wed, 17 May 2006 22:59:34 GMT Hi everyone My Granny got the jail, well kinda she got put into a homepoor wee soul. Hope she is doing fine and settling in the new place, Jail well it must seem like jail not that I have ever been Cheers Gary Article: 97437 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: So Granny got the Jail Date: Wed, 17 May 2006 19:47:04 -0700 Message-ID: References: In article , gary.mcisaac@ntlworld.com (known to some as Gary McIsaac) scribed... > Hi everyone > > My Granny got the jail, well kinda she got put into a homepoor wee soul. > Hope she is doing fine and settling in the new place, Jail well it must seem > like jail not that I have ever been I'm sorry to hear about it, but what does it have to do with amateur radio and the design of related electronic accessories? (which is what 'homebrew' means in this context). -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute (Known to some as Bruce Lane, KC7GR) http://www.bluefeathertech.com -- kyrrin a/t bluefeathertech d-o=t calm "Salvadore Dali's computer has surreal ports..." Article: 97438 of rec.radio.amateur.homebrew From: mathilda@canadaweb.net Subject: Les plus belles jeunes filles du web Date: 18 May 2006 10:04:48 GMT Message-ID: <446c46bf$0$21301$8fcfb975@news.wanadoo.fr>
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Article: 97439 of rec.radio.amateur.homebrew From: John - KD5YI Subject: Re: Thank god for this References: Message-ID: <655bg.7359$Go6.5368@trnddc04> Date: Thu, 18 May 2006 20:49:06 GMT Gary McIsaac wrote: > Hi everyone > > Just a quick message, does anyone actually read this news thing if so I > would be glad to know why. > Is there anyone out there? > > Thanks > > Gary > > No. Nobody is here. Article: 97440 of rec.radio.amateur.homebrew Message-ID: <446CDD81.D588D7A4@earthlink.net> From: "Michael A. Terrell" Subject: Re: So Granny got the Jail References: Date: Thu, 18 May 2006 20:49:12 GMT "Dr. Anton T. Squeegee" wrote: > > In article , > gary.mcisaac@ntlworld.com (known to some as Gary McIsaac) scribed... > > > Hi everyone > > > > My Granny got the jail, well kinda she got put into a homepoor wee soul. > > Hope she is doing fine and settling in the new place, Jail well it must seem > > like jail not that I have ever been > > I'm sorry to hear about it, but what does it have to do with > amateur radio and the design of related electronic accessories? (which > is what 'homebrew' means in this context). Maybe his granny got wired on homebrew moonshine? -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 97441 of rec.radio.amateur.homebrew Message-ID: <446CDDB4.1ED6D05F@earthlink.net> From: "Michael A. Terrell" Subject: Re: Delay Line -- free References: Date: Thu, 18 May 2006 20:50:04 GMT jack wrote: > > I have a delay line from a Tektronix 7704 -- free if you will pay the > postage (should fit into a USPS Flat Rate priority mail box). (the power > supply in this thing was shot). > > Jack You might want to post this one news:sci.electronics.equipment as well. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 97442 of rec.radio.amateur.homebrew From: Me Subject: Re: Thank god for this References: <655bg.7359$Go6.5368@trnddc04> Message-ID: Date: Thu, 18 May 2006 23:47:43 GMT In article <655bg.7359$Go6.5368@trnddc04>, John - KD5YI wrote: > Gary McIsaac wrote: > > Hi everyone > > > > Just a quick message, does anyone actually read this news thing if so I > > would be glad to know why. > > Is there anyone out there? > > > > Thanks > > > > Gary > > > > > > > > No. Nobody is here. Not only that but we really don't care if you read it or not...... Me Article: 97443 of rec.radio.amateur.homebrew From: "Brian Murrey" Subject: Parts for Sale - Updated Message-ID: Date: Fri, 19 May 2006 00:49:45 GMT I have moved my junkbox surplus stuff to a new website. http://www.hamradparts.com 1N4148 Diodes $3.00 for 100, $4.00 for 200 1N4001 - 1 Amp 50v General Purpose Rectifier Diodes - $3.00 for 50 33pf NPO Caps, SMT 0805, 50V - $3.00 for 100 150pf NPO Caps, SMT 0805, 50V - $3.00 for 100 220pf NPO Caps, SMT 0805, 50V - $3.00 for 100 390pf Caps, SMT 1206, 50V - $3.00 for 100 1500pf NPO Caps, SMT 0805, 50V - $3.00 for 100 3300pf Caps, SMT 0805, 25V - $3.00 for 100 .1uF Caps, SMT 0805, 50V - $3.00 for 100 SPECIAL SMT PACK - 50 of each listed value $9.00 350 total parts 2N3704 NPN TO92 - 20 for $2.00 2N2907 PNP TO92 Package - $4.00 for 50 2N3904 NPN TO92 Package - $4.00 for 50 2N2222 NPN TO18 (metal) Package - 5 for $1.00 MMBT4403 PNP SMT transistor - 50 for $4.00 SPECIAL: 100pcs PN2222A Motorola $7.00- FREE SHIPPING 2N2222 NPN TO92 Package - $4.00 for 50 The 2N2222 is a bulk transistor...meaning the part is not labeled. They ship in a Zip Lock packet and the packet is clearly labeled. 2N3906 PNP TO92 Package - $4.00 for 50 The 2N3906 is a bulk transistor...meaning the part is not labeled. They ship in a Zip Lock packet and the packet is clearly labeled. IRF510 - MOSFET AMP TO220 - 4 for $5.00 Crystal Ladder Filters anyone? 3.575611 Mhz HC49 Crystals - 5 for $2.00 4.9152 Mhz HC49 Crystals - 10 for $3.00 9.830 Mhz Crystals (SS2 package) - 20 for $3.00 LM7805ACV 5v Positive Voltage Regulators (TO220) 5 for $2.00 LM386N-1 - Audio Amp 6 for $5.00 Sticky Back Rubber Feet for your projects, self adhesive - 8 to a strip - 2 Strips for $1.00 Panasonic Wall Warts - 12VDC, 500mA (center negative) $6.00 each If you need center positiove, cut off the end and reverse it. I use these to power my rock mites, my TT2, and all of my homebrew test gear. 8pf NPO Ceramic 50 for $3.00 11pf NPO Ceramic 50 for $3.00 12pf NPO Ceramic 50 for $3.00 22pf Ceramic 50 for $3.00 470pf Ceramic 50 for $3.00 560pf Ceramic 50 for $3.00 .1 uF (104J) NPO Ceramic 50 for $3.00 .01uF (103K) Ceramic 50 for $3.00 SPECIAL PACK - 25 of each listed ceramic $10.00 200 parts total Cash, check, paypal now accepted Paypal to: orders@hamradparts.com Add $3.00 shipping to any order under $50.00 unless you are ordering the special Motorola PN2222 transistors. Brian Murrey 47 Grassy Drive New Whiteland IN 46184 73 de KB9BVN -- ========================================= Radio Amateurs - Fill your junk box, from my junkbox! http://www.hamradparts.com 73 de KB9BVN ========================================= Article: 97444 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: So Granny got the Jail Date: Thu, 18 May 2006 21:08:17 -0700 Message-ID: References: <446CDD81.D588D7A4@earthlink.net> In article <446CDD81.D588D7A4@earthlink.net>, mike.terrell@earthlink.net (known to some as Michael A. Terrell) scribed... > > Maybe his granny got wired on homebrew moonshine? ...Or constructed a moonshine-driven battery? Be interesting to try running a QRP rig off that... ;-) -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute (Known to some as Bruce Lane, KC7GR) http://www.bluefeathertech.com -- kyrrin a/t bluefeathertech d-o=t calm "Salvadore Dali's computer has surreal ports..."