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Emory, Have you tried the Audio Volume Step control? I believe the default is 0.25 dB per step. At that level, it seems like the volume control doesn't do anything! It actually does, but takes many

BTW, Hans, I never said I was happy with no key clicks, just that I was happy that they were reduced enough to make the QMX easily useable with 017, while before it was bad enough to make me use

Hi Dan, I had a similar problem on 20m with my QMX. TX and RX was not ob transceive and about 450Hz off. A factory reset resolved the issue. I had it twice so far, but do not know what caused it to

Just finished new build of QMX 20 to 10.? But no control of volume?? Its volume is full, can not adjust it?? Checked connections several times, all connections on the pot on both top of board and

I have key thumps, such that my QMX is unusable.? They are worse on the lower bands.? I have tried a variety of Audio and AGC settings to no avail.? Settings adjustments are at best like aspirin

Dan de NM3A at mail dot com

John I think you are correct.I believe I would need a spectrum analyzer to correctly and safely measure the final output harmonics. Might invest in a TinySA.? Greg Yahoo Mail: Search, Organize,

I have one each hi band and low band QMX Rev 3 using _017. Settings are: AGC ON Threshold 7 Slope dB/dB 95 Noise Filter 5 Hang time 50 Smooth Samples 99 Recovery dB/S

All, I definitely have the clicks. They are not as bad as pre 017 levels, but definitely there. They are much worse at high volume levels. So from a practical point of view, when you work a strong

Continuation of a story. After the sudden strange disappearance of the ability to turn on the RIT, returning to factory settings and re а flashing the firmware did not help. Checking the resistor and

Perhaps you intend to solder connections to the unpowered LPF you desire to test? JZ [email protected]> wrote:

Marek, When QMX is unpowered, the PIN diodes are all in a high resistance state. No particular LPF is selected. What would the VNA measure? When QMX is powered on, an LPF can be selected, but the

@ Donald yes you are right, I used wrong description. As for nanoVNA, you do not put power through it. S11 (source) goes into Input side of nanaVNA and S21 into output (ANT?) end. You should see

I've been searching and looking for info, but failing to find it. Which GPS bands will the QLG-2 decode?? Just L1?? L1 + L2? L5?

Many thanks. Makes good sense.? I have a 20db broadband attenuator I purchased for another project. I'll check the measured decrease against the rated VNA specs before proceeding.?? Greg Yahoo

I like hearing success stories here on the forum, gives me hope!!! ? Enjoy the fruits of your labor building the QMX. -- Trevor (N0YMA)

There are power limits for VNA ports, which will vary by device.? This should be specified by the manufacturer/designer. I would suggest 0dBm as a reasonably safe upper limit. When measuring

.....SECOND and subsequent harmonics... The "first" harmonic is the desired fundamental frequency. 73, Don N2VGU

Good point. I do have a VNA, but still learning how to use its many functions. I've only used mine so far for SWR antenna checks. Am I correct that there is some, likely very small, maximum input RF a

I still have the thumps at the end of each dit/dah, running firmware rev 17 and with a clean bill of health from the terminal utility. Bad enough I can’t use the unit for CW. Settings are the same