Re: [Drakelist] Hearing 2 PTOs at the same time?
The original cable was Belden 8421 Low Capacitance microphone shielded wire. It was the same size and flexibility of the other 'audio' cables, and about one-half the capacitance. RG-62 will work, but is MUCH thicker, stiffer and damage prone if bent over too tight a radius. It's also somewhat difficult to solder without melting the almost non-existent dielectric. That said, it IS cheap, as many miles of it was pulled out of attics (and many miles still remain!) as relics of earlier computer networking systems. The original cable, 38 long tip-to-tip, had a total capacitance of 60 pF. RG-59A/U will also work, but is about the same size as RG-62, although it is considerably more flexible. A list member bought a quantity of 8421 a while back, and may still have some. I think it's still available by the foot from ACK in Atlanta, but everyone else wants to sell you a 500' spool! Also use good quality connectors, I prefer Switchcraft 3502. They have a nice backshell that encourages you to pull on that rather than just yank on the cable! :-) Regardless of what cable you use, it's best to tweak up the INJ trimmers on the receiver and transmitter with the two units cabled together. This will provide the highest levels of received and transmitted signal when in transceive mode. There is almost always a slight reduction in the 'non-controlling' unit, but should be very little. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Eugene Balinski wrote: The injection cable is nominally RG-62. It is available from a number of sources if want to make your own cable for the Drakes 73, Gene K1NR On Sat, 04 Dec 2010 20:19:34 -0500 Garey Barrellk4...@mindspring.com wrote: Joe - When all else fails :-) Yes, the INJ cable provided by Drake was a special, low capacity cable, cleverly marked for 'INJ'. It will definitely increase the transmitter output when transceiving under RCVR control. Works the other way too, received signals are louder when using XMTR control as well. I believe your 'double PTO' problem was just corrosion on the 'non-INJ' cable's pins. All's well that . 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Joe Loverti wrote: Gary, I found the original drake injection cable... it has a metal tag crimped to it that reads: INJ. When I use that cable my RF output on the T-4XB increases nearly 30 watts! It feels like I installed a new set of finals. And the problem of the PTOs has disappeared. Nothing like original equipment! Thanks! 73, WW8X Joe Loverti Sr. Miamisburg, Ohiio ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake Low Pass Filters and other misc items FS
Drake items for sale: Drake TV-1000-LP Low pass TVI filter This is the filter that is in the copper case, and may also be used on the low end of six meters, as well as HF. It is a 50 ohm filter and is good for 1000 W below 30 MHz, and about 200 W up to 52 MHz. With paper work for $30. Drake TV-3300-LP Low Pass TVI Filter This is a modern low pass filter to go between your transmitter and antenna, and has been optimized to have more attenuation in the 40 MHz region, where many TVs have their IF. It is good for 1000 Watts average according to the manual, and has over 80 db attenuation at 41 MHz. This one looks great, and includes the paper work. $30 Case for Drake TR-33 C This is the black case that fits the Drake TR-33 C, and has cutouts in the back for antenna, power, etc. It includes the shoulder strap, and is in good shape. $12 Case for Drake TR-22 As above, but for the TR-22. No shoulder strap. $10 3 pin mic plug for TR-22 This is the small 3 pin mic plug that fits the Drake TR-22 mic jack. It is much smaller than most of the mic connectors. This one has been used, but should still be usable some more. $10 Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to w...@flham.net or w...@arrl.net Voice Phone (352) 732-8400 __ Information from ESET NOD32 Antivirus, version of virus signature database 5652 (20101126) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] NEW! Service Supplement CD for R-4A / T-4X
I have received numerous requests for a CD covering the R-4A and T-4X. Here it is! Hopefully people have not given up, or the requests were not all from the same person, but ... This was not an easy one, since it seems there were quite a few changes in the R-4A AFTER the last known schematic, 1026665400, requiring a revised schematic. This CD is for the 11 tube version of the R-4A (s/n 4054 - 6999). The early version is 'coming', but I had to start somewhere! The T-4X was also in a state of flux, as I have found three distinct versions of the schematic, none dated or otherwise identified. Of course both (now three) R-4A schematics are included, plus all three (now four) T-4X schematics. There are 58 pages, 32 of which are in high resolution color, in the Service Manual. Along with the Manual directory with quality scans of the C-4, L-4B, FS-4, MN-2000, W-4 and other original manuals, there are the usual batch of miscellaneous files with field changes, modifications, troubleshooting tips, etc. All the previous CDs are still available too! -- 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4A, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] NEW! Service Supplement CD for R-4A / T-4X
Garey, Well, if it is anything even a fraction like the CD I have for my C line, it will be worth its weight in gold. Thanks for supporting the Drake enthusiasts. 73, Evan, K9SQG -Original Message- From: Garey Barrell k4...@mindspring.com To: drakelist Drakelist@zerobeat.net Sent: Sun, Dec 5, 2010 6:21 pm Subject: [Drakelist] NEW! Service Supplement CD for R-4A / T-4X I have received numerous requests for a CD covering the R-4A and T-4X. Here it is! Hopefully people have not given up, or the requests were not all from the same person, but ... This was not an easy one, since it seems there were quite a few changes in the R-4A AFTER the last known schematic, 1026665400, requiring a revised schematic. This CD is for the 11 tube version of the R-4A (s/n 4054 - 6999). The early version is 'coming', but I had to start somewhere! The T-4X was also in a state of flux, as I have found three distinct versions of the schematic, none dated or otherwise identified. Of course both (now three) R-4A schematics are included, plus all three (now four) T-4X schematics. There are 58 pages, 32 of which are in high resolution color, in the Service Manual. Along with the Manual directory with quality scans of the C-4, L-4B, FS-4, MN-2000, W-4 and other original manuals, there are the usual batch of miscellaneous files with field changes, modifications, troubleshooting tips, etc. All the previous CDs are still available too! -- 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4A, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Service CD's
To all, I have both the B line and the TR4c CD's and they are very easy to work with and have material you don't have available anywhere else. So if Garey say's he has the CD for R4A T4x if I had them I'd get it. Carl WD8NHK___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Article on boatanchors, primarily Drake
The following link may be of some interest to group members. _http://www.k4lrg.org/Projects/Magic_of_Boatanchors/index.html_ (http://www.k4lrg.org/Projects/Magic_of_Boatanchors/index.html) ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
