Should all four finals be matched in gain like some of us did with vacuum tubes?

I've never worked with RF circuits before so I am happy my QDX works on the first try (I made some QSO on FT8 but I leave it on WSPR most of the time). I have two questions. First the simplest to

Howard W6ZZ

The ATS series by Steve KD1JV starting with ATS3 uses a clever CW shaping circuit producing a trapezoid envelope with timing independent from the power supply

ALAN AND EVERYONE: SUCCESS!!! FOLLOWED ALL STEPS, LOADED STM (2014) SERIAL PORT DRIVER, (DON’T KNOW IF 32 OR 64 BIT) AND JUST GOT A GREEN LIGHT ON CAT TEST!!! Thank you all very much, Howard

I have had my Teledyne thermal stripper for decades and it is still doing its job flawlessly. It is still the best (only?) way to strip PTFE- or Raychem-insulated wires and will not nick any wire

Alan, I tried first to delete my unused Comm Ports. (That didn't work). I will try your suggestion and post the results later today. This is what I'm currently seeing in Device Manager: QDX

Howard Have you used my way of installing the driver? If so you should see the QDX in Device Manager. Boot the computer. Open device Manager. Open Ports (COM and LPT) Plug in the QDX USB. Power up

Does the QDX show up in Device Manager?" 73 Evan AC9TU

I am not sure whether WSJTX on Linux / Chromebook would work, I tried some audio applications and there was some stuttering in the receive audio. However the following web based terminal works nicely

The only port available on my Radio Page is COMM9. It failed to assign to QDX (perhaps) because it was assigned to another device. I used the procedure in "Finding & Removing Hidden COM Ports" to

Steve KD1JV used 2N7000 FETs in his earlier ATS series transceivers. They were much more fragile than BS170s. Don't use 2N7000s as BS170 substitutes. Vojtech OK1IAK

I will look again Tom, but when I did none of the boards in the complete set had a version # on them. I was surprised. Will use my mag head set next time. I want to build the clock kit first as I

depends on what you call "in the field". If you have to cary it around RG 8 would be heavy. For that length I would use RG 58 especially for 40 m On 15m RG 58 may become already a bit lossy. I have

QRPLabs sells 10-packs of BS170s and has plenty in stock. http://shop.qrp-labs.com/bs170

Yes, some 64 bit systems make it hard to install a driver that is not listed. But the first thing is to try by dismissing the warnings. If that does not work then it gets more complicated:-) 73

Phil, The easy/non answers first. Q7, Fails due to shorted BS170s. Several have been reported as simply failing with no obvious reason. One current post says this. L1, one previous failure

Others suggested here on the list that Q7 failed due to shorted finals. Frankly I would expect the excess current draw to be much higher than 40mA or so with a shorted final FET, but it may be

The same happened to me yesterday. The maximum Q7 gate voltage +-20V was likely exceeded and the FET gate to source shorted. Removing the FET and replacing it with a bit of wire fixed it. BTW apart

Thanks, I will try your suggestions. Rob, N3EQ