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Whenever I see something like this happening with multiple UUT’s, I check the obvious: is the transmitter outputting? Are the meters being fed correctly (rig to input, load to output)? We all do

Hi Mike, Don’t forget that R1 is in the circuit. If that goes high in value, it could throw everything off. PIN diodes should work well in these meters. They work well into the VHF range and have

Hi Mike Search for 1N295 here: https://www.nteinc.com/search.php Found NTE109. Datasheet NTE109: https://www.nteinc.com/specs/100to199/pdf/nte109.pdf How to find NTE distributors:

Hi Bob How about buying/building these DDS VFO: Noble Radio NRV7 Remote Digital VFO for Drake TR-7: https://www.eham.net/reviews/view-product?id=12990 NRV7 Remote DDS VFO/Station Accessory:

Does anyone have a list handy of the keying voltage and *current* on the CW key line for the various T4 transmitters? I've gone over all the manuals, and the usual web pages, but this doesn't seem to

Sorry I should have done a little more research on those items. I replaced the diodes in my W4 last year and it worked great after the diodes were replaced. Still works like it should. Was able to

Lots of vendors selling 1N34A even if Mouser doesn't stock them. is

Did you put the meter for reverse and adjust the capacitor for minimum first ? There are 2 schematics that I know of for the wattmeters are you sure you are looking at the correct one ?? I don't

Bob… Those parts are not diodes…some kind of SMD device for control circuits. The 1n34a is listed as obsolete Mike Btw. Found some 1n270 at Jameco Knowledge is knowing a tomato is a fruit; Wisdom

link for 1N34A Search results for: 1N34A – Mouser ( https://www.mouser.com/c/?q=1N34A ) 73? Bob

I can’t find a listing for them on mouser. Will check again Mike Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a fruit salad.

The last time I needed 1N34A or 1N295 diodes, Mouser had them for about 75 cents each.

Hi, Ron, already checked the meter movements and they all seem to be working fine. I’ve been poking around with one of the meters. Trimmer R4 sets the calibration for the 200W scale. Voltage from

Mike first you need to be sure that the ones that doesn’t work at all DO have good panel meters Take the wires off the meters and put a VTVM or VOM that is on the ohms scale, across the meters and

1. Check meter connections. I had a bird meter that developed corrosion under the nuts.? 2? Check coax to dummy load and dummy load for 50 ohms. ralph ku4pt

Gang, It’s been too cold to do much outside, so I’ve been tinkering around in the shack. I have a nice collection of Drake W4 Wattmeter. I think there are six or so in the collection. So I decided

$7 is a great deal for real Apple! 73, Gary WB6OGD

Dan, Thanks for this post! My 2C stopped working on most bands. I cleaned the Aux switch as you suggested and it miraculously came back to life. Your post certainly saved me a lot of troubleshooting

*** Is this a 6.3VAC or 12.6VAC filament circuit? If it's 6.3, you might want to use a voltage doubler. Lemme see: 6.3V RMS = 8.9V peak. Yup, definitely needs a doubler. - Jerry, KF6VB 12.6 VAC and

*** Is this a 6.3VAC or 12.6VAC filament circuit? If it's 6.3, you might want to use a voltage doubler. Lemme see: 6.3V RMS = 8.9V peak. Yup, definitely needs a doubler. - Jerry, KF6VB