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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

I've made an Iambic keyer using a Teensy, a sort of Arduino on steroids. As for shipping costs, for small things I use eBay's free shipping or Amazon Prime and go with UK sources, even if they are

Tayda Electronics has Nano clones that are top notch and low cost. I've used several of their parts. Jim, K8IQY

And for whom with out that dang ole toroid Or not want to fiddle with winding one Check out "THE"? GQRP Site The Resistive SWR Bridge Highly recommended for both beginners and experienced

I don't see how adding another SWR bridge will help things.? The QMX already has a SWR bridge, it can also control the Tx power, and all this is under the control of the QMX controller.? All the OP

I've had good luck with the Elegoo Arduino clones. Both Uno and Nano. I don't recall whether I used Amazon or AliExpress, but they work fine. They go into enough projects that I think I bought 3-packs

To echo Larry: I built a K3NG keyer based on an inexpensive Arduino clone. Easy to build, easy to program (the Arduino eco-system is targeted to a wide, non-techy, audience), easy to customize, works