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Hi Paul, I just added a close in SA plot of the output of my TR-7 digital VFO which uses the Si5351A device. Regards, Dale W4OP

The following photos have been uploaded to the DRAKE TR-7 DIGITAL VFO ( /g/DRAKE-RADIO/album?id=294391 ) photo album of the [email protected] group. * Si5351A CLOSE IN.png (

I think it looks great!

This is probably a stupid questions but I have to ask; What are the minimum connections needed for troubleshooting/transmitting besides the obvious power and dummy load? Thanks! Gus W?GUS

Paul, I'm curious as to the RF output voltage you're obtaining from your Si5351A VFO.? I suspect you're amplifying for use into the Drake 2NT? I'm using the same Si board with a homebrew RF voltage

Paul Lukosius <plukosius@...> added the photo album Drake 2-NT Digital VFO ( /g/DRAKE-RADIO/album?id=294409 ) : An EU station complained about my HA-5 drifting on 10M so I

*** OK, I pulled it apart again. Recleaned the plastic gears, and cleaned and lubed everything that was metal-to-metal sliding contact. Put it back together, and all is well. The tuning dials turn

I have a TR7 PTO, total;y disassembled where it could be, ultrasonic cleaned to remove old lubricant, relayed and reassembled. This one its as good as factory new. $50 shipped in CONUSA. Gary W0DVN

Jerry, I had the same problem (PTO output dropping) in my T-4XB when I bought it. It turned out to be the ground connection was via a lug under the PTO mounting stud.? Probably was loose from the

Hello All, You may remember my TR7 that loses lock. But only when it's in the right mood. Tap on the big tuning knob and *poof* - no lock. Hit the "FIX" button a couple times, and lock comes back. I

The following photos have been uploaded to the DRAKE TR-7 DIGITAL VFO ( /g/DRAKE-RADIO/album?id=294391 ) photo album of the [email protected] group. * VFO REAR.jpg (

Dale Parfitt <PARINC1@...> added the photo album DRAKE TR-7 DIGITAL VFO ( /g/DRAKE-RADIO/album?id=294391 ) : The VFO is from QRP Labs and employs the Si5351A CMOS clock

Interestingly, the original AC-3 was designed to run the TR-3, in ‘63-64, so they did add capacitance in the transceivers. The transmitters really did not have extra filtering, as their cans were

I'm surprised Drake didn't design more headroom in the application. That's cutting it close Electrolytic caps that run anywhere near their rated temperature have a remarkably short lifetime in their

I checked the TR-4C, S/N 37k: Mallory, 250, 250, 250, 25 VDC. ?I cannot see the date codes clearly, but I do see 85 degrees C, clearly. ?That one looks original, too. ?I have one Hayseed cap for

I've also heard the story that one should operate electrolytic capacitors near their marked voltage.? The rationale was always been theoretical rather than practical (based on experience over

I'm working on a TR-4C (yep -- the same one that had the bad can) that was built in September, 1972, so a very early example. I noticed that there were small flat brass washers between the PTO and the

Interestingly, the cap I removed from this TR-4C (built in September, 1973) has no branding on it. Date code of 7326, so around the end of June. One of the high-voltage sections failed leakage test

The TR-4CWRIT multi-cap can manufacturer is Mallory — looks original. ?The four VDC markings are 250, 250, 250, 25. ?The transceiver serial number is 44K. ?I have a TR-4C I’ll check for as soon

The interesting bit is that the +250 is already filtered in the AC-4. This buss is then filtered again in the TR3/4, so there’s not much ripple there to begin with. Steve Wedge, W1ES/4 Time flies