"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- I have successfully done the Prather mod to add 0 to 0.5 mHz, 0.5 to 1 mHz, and 1 to 1.5 mHz. I used the FAR Circuits board and made several parts substitutions as many of the original parts listed in the article are no-longer available. For example the relays I used were Teledyne 172D-12 because that's what I had. Fortunately they have wire leads which could be routed to the proper holes on the PC board. I also added the diodes to add those bands. It works great but I sure could have used an updated board layout.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Pruitt Sent: Saturday, January 14, 2006 11:30 PM To: DrakeList Cc: L.D. Ritta Subject: [drakelist] Re: [Drake] TR-7 Help "Jim Pruitt" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Hello Lee. The Communications Quarterly article reprint is at the Drake Museum at http://www.dproducts.be/Drake_Museum/images/tr7art.pdf It takes a while to load. This is the link to the mods and corrections to the above article: http://www.dproducts.be/Drake_Museum/tr-7mods.htm If you find a source for the MA4P4002D let me know as I am still looking for one. I did get the MA4P4002B which will work without problems if you do not run RTTY and other full duty cycle modes. I got the MA4P4002B from Richardson Electronics ( http://www.rell.com/ ) for about $7 if memory serves me. In the above mods page, Scott Prather mentions an EAC relay that Digikey sells that will work with a coule of wiring changes or N0SS laid out another QSK pc board for me that will take the EAC relay. I have been unable to find a reasonable source for the Magnecraft W104MIP42 relay but did find several sources--the cheapest was $38! The EAC relay from Digikey was in the $7 USD range. I got the RSD-12 relays from Richard AG6K ( main page at http://www.somis.org/ ). He bought many when Aromat informed him that they were discontinuing that relay so that one is available. Also the Communications Quarterly article appears in John Lougmiller (KB9AT) excellent book "The R.L. Drake Story -- A Family Affair" available from Universal Radio and Amazon. The article appears a little different in the book because Scott Prather re-drew the schematics so that they are easier to follow. The PC boards for the Scott Prather mods outlined in the Summer 92 Communications Quarterly article are available from FAR circuits. I know you will like the TR7. It is and was a great radio. Good luck. Jim Pruitt ----- Original Message ----- From: "L.D. Ritta" <[EMAIL PROTECTED]> To: "'Drake Listserver ( QTH.NET )'" <[EMAIL PROTECTED]> Sent: Saturday, January 14, 2006 7:25 PM Subject: [Drake] TR-7 Help > > Howdy Folks > Does anyone have any of the following articles. > > Communications Quarterly Summer-92 TR-7 Modifications > HR Aug-87 Better Frequency Stability For Drake TR7 > Qst 1982 warc and lf on tr-7 > I have a TR-7 I would like to update. > Thanks > 73 Lee VK5ZNA > > ______________________________________________________________ > Drake mailing list > Home: http://mailman.qth.net/mailman/listinfo/drake > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[EMAIL PROTECTED] ---------------------------------------------------------------------- Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ---------------------------------------------------------------------- ---------------------------------------------------------------------- Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
