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My R-4B isn't real early, S/N 8825 but it doesn't have the board that's in Thomas's receiver. It seems to connect largely to board 3 in Garey's manual. The product detector AVC/S-Meter board. I don't

Good morning everyone made great progress with the TR7. Low signal cal and radio in general was not those pin diodes on the feed to the cal. Scoped the two pin diodes, was ok. Eventually found? an

Check: INJ cable. Make sure it’s good. Injection matching at the two front sets of trimmers Receiver V2 and V8 (6HS6’s). Try subbing 6AH6’s if you don’t have the 6HS6’s. Steve Wedge, W1ES

This isn’t a class issue. This is a government overreach issue. If there’s any greed involved, it’s not on private citizens. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a

*** Doubt it. The billionaires don't care about Ebay sales. And more 1099's means more tax revenue, right? - Jerry, KF6VB

I just sent a part to a ham in Italy. We wound up with me sending to a friend of his in Miami, who’d meet up with another friend going back to Italy. Twenty years ago, I could fill out a customs

Ebay has totally roached international shipping . ?While Pirate Ship is able to provide decent service (I just shipped a 5 lb box to New Zealand for $20 ) I was never able to figure out how to NOT

I have looked at the B Line Service Manual by Garey, K4OAH (SK) and there is no board shown there in that location. Thinking that this could be a very early version, I looked at the 11-tube R-4A

I have a complete re-cap kit for the R-4C that I bought from Hayseed a couple of years ago. I've decided not to use it as the caps in my R-4C are okay. This kit sells now for $78.95 plus shipping.

Thomas, what are the serial numbers of the two receivers and which one has the extra board? Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana.

*** There are two bus wires that go everywhere. One is 0V on receive, and -15V on transmit. The other is zero volts on transmit and -15V on receive. Zero volts turns stuff on, and -15V turns stuff

There is lots of good advice in this email string. I would also point all of us to this link about T/R switches <https://www.wireless-girl.com/Projects/TRswitches/Johnson/>. I want to build my own

$1500 is a bit much for me but thanks in any case. 73, Doug/WA1TUT -- Doug/WA1TUT

Thanks again Steve!

One can build a SPST NC reed switch with a small magnet attached to the body of the switch, adjacent to the contacts. With the correct amount of magnetism, the switch will be held closed. Apply an

The Atlas 350xl uses the same qsk architecture through the magnecraft's? fast switch relay. Giuliano, IV3DLW

Ken, The answer to your question is yes. ?Using the external Dow Key auxiliary switch in the open position will provide sufficient isolation to all of the active devices of the receiver front end.

Jerry, this makes sense for QSK except for the part about the RX being biased off during transmit. Surely there's another reed or transistor switch doing the biasing, otherwise how would QSK work?

Hello Group, I have two Drake R-4Bs here. One of them got a problem, but this is not the topic here. When I compare the bottom views of these two receivers, one of them has a small additional board,

If your Dow-Key relay is acting properly and disconnecting the Drake 2B receiver when transmitting, you will be fine.? You can confirm the switching of the relay contacts with an ohmmeter or