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Hans ,? Jonathan says? -? "I am not even sure if a single resonant band pass filter is the best option for my use.." This has some ambiguity? - does it mean a single resonant cct, one per band. ?

Mordan42, How is it doing on receive? Check C510 and C526 to see if they are damaged. If either have cracked or have been overstressed by high RF current, output power will be very low. JZ KJ4A

Digikey has BS170s in stock for 0.59 each. ? By 10 and then you will have spares. -- 73, Bernie, VE3FWF

"Cope with" and "make accurate measurements with" are different things. 73, Don N2VGU

Congrats on successful surgery! I second the suggestion to add an L14 diode to protect against a possible failure mode that sounds consistent with what you described. Other than the L14 voltage, I

Hello all! I have a QMX rev. 1 low band that has faithfully served me on 19 POTA activations, almost 1,000 QSOs and, recently, I was successfully using for my first 4 JS8Call contacts. After using it

Thanks Ron, I reckoned that if the manufacturer wrote the maximum limit on the front of the analyser that was what it would cope with. I'm running about half that power. I've got a home made

The aggressiveness with which the QMX swr protection kicks in gives me the confidence that I can present some pretty horrendous mismatches at the RF port and finals will be fine. G0UPL demonstrates

Chris G5CTH, The N7VE is an *absorptive* bridge, so it is *not* the same thing. ?Power is intentionally dissapated while never allowing the transmitter to see greater than a 2:1 SWR no matter

To that I'd look at https://blog.radioartisan.com/arduino-cw-keyer/ its a Arduino based keyer that's feature loaded and open source. -- Allison ------------------ Post online only, direct email will

Chris, you technically don't meet the -43 dBc requirement for harmonics on your 80 meter reading. However, I would suggest you add some more attenuation in the path to the SA. At +15 dBm currently,

Measured, all good, replaced BS170s and back in business, 5 quick QSOs over Europe from my balcony on the 1st floor are proof

The High band spectrum analyser topic prompted me to post similar measurements I made with a low band QMX using an apparently good spectrum analyser. I've attached the data and my analysis. It should

Kanga Products (UK company) do official K1EL winkeyer chips for not a lot at all....

Hi Ron, You could get an ATTINY chip from Digikey and program it.? Digikey seems to have a way of getting orders into USA without their customers incurring $35 customs brokerage gouges.? Also, see

That may be an option! Paul, I have limited upload speed there, (600kbps), so remotely viewing video is rough. But fair point I could use the remote desktop to view on the screen of the remote PC at

I made a no-frills keyer with only 3 standard CMOS ICs. See: Simple_CMOS_Keyer_HB9ABO.gif (732×469) (qsl.net) (

If one is to build a QDX-M for a band lower than 20m how should they set up the jumpers? Or does it not matter, as you can change it all in the band configuration in the Terminal program? (I'm

Ron,I built this one a few years back. It works perfectly. PIC-Keyer Overview | | | | | | | | | | | PIC-Keyer Overview Construction of a low-power morse-keyer with PIC

I had the same problem this morning, actually. I'm looking into increasing decoder speed any way that I can...I did find that I should not have had the AGC on (I did) and I should have had the audio