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The TR3, TR4, TR4C, and TR4CW transceivers operate "CCSM" (Controlled Carrier Screen Modulation) AM in one side band only. The side band switch must be kept in "X" which limits the AM transmit in one

Dave, I am sure your VFO puts out a pretty good signal.? It uses the Si5351 clock generator chip (google it).? I use them all the time. But, they put our square waves with harmonics. I don't know

I was about half-way through writing a reply to you when I decided to, yet again, read the section on AM operation. That's when I realized that I had mistakenly been trying to receive in X-AM with the

The TR-3 uses the a product detector for AM reception, and needs to be switched to SSB for receive, but on the? various TR-4, TR-4C, and TR-4Cw's I have used on AM for both transmit and receive, the

On Sun, May 25, 2025 at 07:39 AM, Gary WB6OGD wrote: > > Dave, > Have you actually used that VFO with a 2B? > > I started it but many on this list have been homebrewing a VFO > functionally the same

I'm still trying to determine why my TR-4 won't receive on X-AM. Taking some measurements of V2 (12AX7), Pin 1 (grid) is at -34V. Pin 2 is 0.0. According to the Voltage Chart, Pin 1 is supposed to be

It’s a square wave, of course it has harmonics! I uses an Si5351. You can re-invent the wheel but results won’t be any better than we found. 73, Gary WB6OGD

I have that Chinese VFO. I would look at its output. I believe it has some harmonics. 73 Mike W5RKL https://www.w5rkl.com

On Sun, May 25, 2025 at 11:49 AM, Richard W2ONE wrote: > > > Thanks Dave, > > You are not the first to recommend that I just go get a general coverage > receiver.? I have to admit that that is good,

Thanks Dave, You are not the first to recommend that I just go get a general coverage receiver.? I have to admit that that is good, practical advice.? But I have also repeatedly been told that I am

It turns out that the AC-4 was not connected to the TR-4; however, now that I look at that -60V line, there are a few other paths to ground. R47 and R48 is one path as well as R62 and R113. Thanks

Dave, Have you actually used that VFO with a 2B? I started it but many on this list have been homebrewing a VFO functionally the same as that chinese one for years. It is called the FS-4A, it is a

Not sure how different the RIT circuits are for the TR4310 versus the TR-7 but they are different. ?For example, with the 4310 using RIT, when the PTO dial is moved the RIT is automatically turned

Ahh. That one eluded me. The "KEY" line went straight up there and I never looked back... I'll check again but I'm pretty sure the AC-4 was connected when I was checking that resistance. Thank you!

Richard, 1) Here's a picture of the little VFO I use. The price is only up a few dollars over what I paid, at this time. There was a com

Dave, Can you explain the working of the VFO a little, please?? I have researched this, but all that I can determine is that people do it, and very little information on how they do it or how doing

Barry, Could it be... R20 3.3M goes to -60V which goes to pin 9 on the Cinch Jones connector to the AC-4.. which goes through the transformer and D7 to ground. Is the AC-4 disconnected? 73, Gary

I'm looking at the resistance values on V2, Pin 1 and something doesn't make sense to me. With a key inserted and the key up, I'm getting about 5.7M. With the key down, I get about 3.3M. The key-down

Richard, Jim did a good explanation of how to use the passband tuner to hear down close to zero beat. A difference in the dial calibration at 3.6 and at 4.0 of 1KHz is fine.? The 2B has a tuning

To hear tones in the "quiet" space you will need to center the passband knob at the middle of the passband. Or halfway between USB and LSB if thinking in terms of SSB. As you tune the dial through