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P.s. sorry, I messed that up... I meant, the Specc Ann center shifted UP to 7,035,000 Hz so still with 10kHz span, if shows us the range 7,030,000 to 7,040,000. Thus the left edge of the screen is at

That's something I hadn't considered... I ran through the test on the 818 again without the preamp (by enabling the IPO setting), the S1/-121dBm signal is still clearly audible on all bands 20-10m but

Why would you ever short an input pin (5) to a formatting logic pin (6) ??? JZ KJ4A [email protected]> wrote:

I can't comment on whether it's normal or not because my measurements also don't look great and I don't know for sure if it's faulty (I had to replace PCM1804). I ordered QDX-M and QMX+ to see if they

Everything is fine with soldering L401. But why when PCM1804 pins 5 and 6 are short-circuited, a distorted receive appears?

Pin 4 of all the op amp ICs is 0 volts. That’s the ground pin for the chip. The volume pot schematic is on the separate front panel schematic page. Volume pot issues can be a damaged pot caused when

I was running through some receiver tests this morning on my high-band QMX (rev 5) and noticed that sensitivity on 10m is somewhat less than the rest of the bands on my unit. I have rigged up a

I don't have a scope, at least not yet. These are my further findings (all measured in receive: R38 is good at 120k. IC-10. Pin 4 is 0v. Q7 gate is 0v. The pot R-1 is doing interesting things but

I only did the AI prompt.? It created the lyrics and I tweaked them.? All vocals, instruments, sound mixing, etc were done by the AI platform, including album art.? I picked the music genre.

The way I look at it, the QMX+ is a very attractive option compared to the QMX. When I operate portable using the QMX, I bring along a battery and tuner. The QMX+ has the room to put the battery and

Note that you may need to modify number of inductor turns; it will take some playing with. The circuit around the band pass filter did change from Rev 1 to when the other band versions were

Hello Ron Interesting question. We are not sending the frequency way above the expected passband because we really want to transmit there. We're doing it because we want or rather, NEED to get that

Hi Hans, Very very interesting.?? I used the Teensy audio library which is 16 bit integer audio processing.? I used approximations and investigated better approximations than what is in the

There is a kit of parts for that: https://shop.qrp-labs.com/SPAREPARTS/sparepartsqmx/qmxhi 73, Don N2VGU

I ended up with knobs I found at adafruit. Using a jeweler's saw, I removed the skirts from the undersides to make them flush. https://www.adafruit.com/product/5527 Al, K2ZN

Thanks Chris. Mitch NK3H

One other thing Dan. The 5v point on JP100 is pin 8 and that one can also cause your issue. Make sure all the pins, especially the ones on the top of the little board are well soldered. ..

Saved it for posterity ! 72, Bill, N4QA/QRP

Actually pretty good! What parts were AI ? Paul Wamble K5EBP 214-405-5876 cell

I forgot the link: https://czh-labs.com/blog/audio-all-pass-filter-phase-rotator-18