开云体育

Hi Bob.? Yes, I discovered that early on.? At 20 meters and above, however, peaking the preselector didn't solve the problem.? While I had carefully aligned the R4C using the Drake recommended

This radio SOLD. - Alan K9MBQ

I would be happy to share it.? It's always a work in progress, but let me clean it up a bit. John WB0RXL

Hi Guys. I installed the aforementioned freq counters for displays on both a n T-4XC and an R-4C probably 10 years ago. At the risk of pointing out the obvious, you have to re-peak the pre-selector

Thanks for your input, Jan

Thank you Stan, I have some of those in the junk box. Looking at the manual, the removal looks challenging. Mike G3ZCC

This reminds me of a frequency counter I built in high school. It was a simpler age. Lots of 7490 decade counters. My counter was extremely insensitive. I tried to get it more sensitive by biasing

If the pushbutton for the PBT is REALLY dirty, you would get something like what you see. Try a bit of contact cleaner on the PBT button and exercise it a few dozen cycles. Gary W0DVN

Your front panel pushbuttons may need a good cleaning. "Clayton kk4iz via groups.io" <KK4IZ284@...> wrote: -- 73 -Jim NU0C

As already mentioned, that suggests that the fixed passband pots are not doing their job. You may be losing voltage somewhere. The service manual does a very good job of explaining how everything

I used 1N4007 to replace the pin diodes in the TR7 I have. They work fine. 73 Stan KM4HQE

Jim- I think you're on to something. I have carrier that persists after I open the key on CW, and I have carrier being transmitted on SSB. Only a couple of watts of output, sounds awful. The "BFO"

Yep -- I got that. Looks like there's one of the AF GAIN ones currently on eBay but no concentric one. eBay is where you're going to find them, eventually... Steve Wedge, W1ES Time flies like an

Are they1/2 inch long? I may have some. Gary W0DVN

Thanks, Rob. I guess I was lucky to have found an R-4C that has them. It looked like what that knob set SHOULD have looked like. I've never been a fan of those pointy metal ones for RF gain. The

"which must have replaced it". Sorry... Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/mail/home) secure email.

I thought so, too but when I looked up the part, it's a silicon diode and it's on the data sheet with the 1N914 series -- which it must have replaced. Steve Wedge, W1ES Time flies like an arrow.

I wasn’t clear. No longer available from Kurz Kasch. Rob, NC0B

You might try eBay. ?Also, if you can find an equivalent size in nylon or Teflon, it might resist shock damage better.

Hi Paul, You may be able to find what you need here https://www.surplussales.com/Antennas/Ceramic_stof.html 73 Stan KM4HQE