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On my TR-4, when I switch to AM mode I get no audio output at all. Can someone please suggest a way to troubleshoot this? I thought that if I touched the grid of the last audio amplifier with a

Thanks for the suggestions guys. There was no jumper on the RV3 VFO socket. I have installed a 8 pin plug with pins 2 & 8 jumpered. It is amazing what happens when something is connected properly!

Or a NTC surge limiter in the AC mains side of the power supply. "Jim VE7RF via groups.io" <jim.thom@...> wrote: -- 73 -Jim NU0C

As a side note, not all step-start controls are really what one would want. ?One particular model (still in inventories) is no longer made and is not a step-start even though it is advertised as

Wasted effort.? ?You would be better off to do any surge limiting with an outboard step start circuit.? ?Like a 20 ohm resistor in the hot leg? of the incoming mains.? ?Then shunt it after 2-3

When I used to work on computer motherboards, the memory batteries were of different sizes and shapes. I found a battery holder source, maybe in China? As long as it would fit the board it worked

Hello everyone, I’m trying to get a RV-3 and a RV-4 working again. When I put the VFO in receive only it causes the radio to trip into transmit in a cycling manner. ?I cleaned wafer switch very

I got a note tonight from Terry Perdue K8TP that some of us are ordering his CD through PayPal (me included), and if you use the F&F mode Paypal is not sending him your address. I thought it always

Sorry, that was supposed to be an off list email. Stan

Ok. Do you have a PayPal account? 73 Stan KM4HQE

Not much to do with anti-surge devices, but the supercapacitors reminded me of... I did something with batteries. I wanted to power a near legal-limit linear off 125V. So I modified a Panasonic

I'm not following the intent here.? The power-on surge is a surge in current.? Capacitors are voltage devices, primarily.? Please elaborate. Eric WK3B

Hey Ronnie, Is that "$28" a reply to my question of how much you want for your 2-BQ?? It seems like a good price.? I do not know what they go for these days, but it seems like even a low price.? If

$28 Ronnie

I have an R-4B also. I need to go through the alignment procedure to see if that is what’s causing the T-4XB to not put out good power when the receiver is used for frequency control. I just thought

The TR3's 100Khz calibrator signal can be checked at pin 1 of V7. If your scope can display the frequency of the signal, connect the scope probe (probe initially set to x10) to pin 1 of V7. Turn the

I agree with Gary.? A nice 2-B and a nice R-4B can both be bought for around $200.? I own both.? While the 2-B is a very good receiver and I like it a lot, the R-4B is even better and I like it

I had a constant tone when I engaged the Calibrator in my TR-4. It can be caused by the carrier oscillator not being set properly. Barry - N4BUQ

The RV3 socket pins that need to be connected when the RV3 is not plugged into the "J2" on the bottom of the TR3, are pins 2 and 8. Look at the TR3 schematic, J2 clearly shows the dotted lines between

Dave,There's a jumper on the remote VFO connector on the bottom of the radio that is cut to enable the radio to work with the remote VFO.? Make sure that jumper is still there.? It should be under