I have a clear recollection of being told, years ago, that the ORIGINAL design use model for the UHF connector series (PL-259/SO-239) was for connecting high DC supply voltages between transmitter mo
There's one for sale on E-Bay -- http://cgi.ebay.com/Eimac-Y-739G-Electron-Tube-8829400007-1_W0QQitemZ350316115268QQcmdZViewItemQQssPageNameZRSS:B:SRCH:US:101 Probably the one he's asking about, I du
I'm constructing a vacuum/reed relay QSK T-R system in my converted SB-220 6m amplifier. I'm using two Kilovac HC-1 vac relays for the input and output RF switches and one small RGS-6396 DPDT (SPDT/R
Thanks for the tip. The solenoid coil measures exactly the same in both directions (670 ohms), which is pretty close to the claimed coil resistance (675 ohms). Also, when using the DVM's diode/contin
Hmmm, you might be on to something here, Jeff. My assumption came from this on the MGS site: " NOTE: Our customers who buy these [vacuum RF] relays frequently are also seeking high speed reed relays
Hi Jim, I was particularly interested in this part of your response: I discovered the 28VDC rating of the aux contacts AFTER I bought the damned thing... D'oh!! The rating may have more to do with to
-- I am not bored. Good post, Lee. I don't agree that the subject is too political, though. I think it bears thought and discussion. And, I think you have hit the nail on the head. There HAS been a g
That URL goes to an earlier version of his site, and the links are all dead. Go here instead... http://www.pmillett.com/tubebooks/technical_books_online.htm Bill W5WVO _______________________________
Uh, yeah. 100 watts power out. To what kind of antenna, mounted where, with how much gain, in what direction... ? This all reminds me, perversely, of the early WW I fighter planes, where they initial
Correcto mundo! I've never been able to see any advantage to that mode, myself. Seems awkward. Just set up your mail client to filter all messages from the list into a mail folder you create. And if
Just did a little googling on these events, of which I knew nothing prior to this thread. Here's a representative site: http://www.bigradios.com/avis/ Who knew? Yikes. Bill W5WVO ____________________
I would NOT recommend the Harbach SB-220 replacement T-R relay. The one I bought worked reliably for less than six months before beginning to exhibit very poor contact pressure in the receive (normal
Allen is a great guy. He phoned me personally to discuss which vac relay best fitted my needs before shipping anything, and as a result I was able to get a couple of Kilovac HC-1s that he had just go
I'm interested in hearing from anybody who is knowledgeable about the SB-220 replacement transformer by Peter Dahl that Harbach is offering -- specifically, wehether it has significantly higher power
I had a bit of an accident with my converted 6m SB-220 (flashover somewhere while transmitting, not sure where yet) that resulted in all the rectifiers in the operating bias string (Harbach rectifier
Thanks for the ideas, Bill. OK, so let's say I want to clean this amp up once and for all. No more accidents. For the bias string, I'm going to go with the 1N5408 diodes I already have, which have a
Carl, the rectifier diodes that fused short were 2.5A (251Ds). I have more questions: (1) One of the other destroyed components in the bias path was a small SPST relay that I used to bypass the 50Koh
Discalimer: I'm not a list owner or moderator. This mailing list is built on Mailman software. If you google this software and read everything that's currently online about it, you'll find that forwa
That is the reason Yahoo! Groups went to the system they currently have. Nobody has to download the attachment unless they are interested in it. But everybody gets a LINK to the attachment that appea
Finally, my 6m-converted SB-220 (which is now beginning to resemble a homebrew amplifier) is back in service -- after repairing the burned-out plate RF choke; replacing the welded-closed bias relay (