On Sat, May 18, 2024 at 03:24 PM, Jim - W7EZN wrote:

Will the QMX+ support the current 10W amp?

Don't see why not.? Maybe in the box. Wonder if it could be fitted before the LPFs and SWR meter.
Chris

Will the QMX+ support the current 10W amp?

Thx--Jim
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Jim, W7EZN? ? 73!

On Sat, May 18, 2024 at 04:06 PM, @Ludwig_DH8WN wrote:

To lower the the pass trough you should increase the inductance. If possible spread the turns more over the whole toroid.

Jim, you could try to tweak the BPF winding of L401 in the same way. It seems there is room on the toroid.

Start with the highest band and with the part of the winding in use for all bands (the part direct connected to Q508, "0 - Start" I think).

73 Ludwig

Hello, I just received a U4B Tracker.? I do not see a port where a USB-mini cable can be connected. There is a metal box with a white plastic piece in the center (see photos). Is this a cover which should be removed?

Thanks! -Bob KA5MIZ

I have to admit something - I was not understanding how the results of the RF, LPF, and BP sweeps are to be interpreted. On the RF sweeps I was especially confused. I thought that the very low reading on the left side of the sweep was the bottom of the band. I did not realize that there is a vertical "line" displayed where the default band frequency is measured. Big difference! So, in my case it is not simply a case of RTFM, it is also UNDERSTAND TFM.

Well, it looks like one of those "It is what it is" situations. the windings for 20/30 meters on L510 and L513 cannot be spread any more than what they are; the turns are evenly spaced around the entire donut - photo attached. Those are the pair on the right side. I did squeeze the turns on L401 and that made a slight change with the RF Sweep. Results are:

80m -10
60m -2
40m -2
30m -5
20m -8

Not worried about 80 meters because my 80 meter antenna is not so good anyway and with only five watts (or less) I might as well transmit into a dummy load.

There was a slight improvement on 20 meters, from -9 to -8. So it appears not much else I can do without major surgery that might harm the other bands.
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Jim / K7TXA
Eagle, ID

SKCC 10447T
BUG 301

Has anyone considered putting a small TalentCell battery in the available space inside the QMX+ enclosure? ?Would have to work out how to charge it without having to unscrew the top every time, but it might make a nice addition...

The QCX+ (!) is 559 gram (19.7 ounces) and I dont think that the QMX+ is MUCH heavier as its same enclosure. So its about the weight of an Elecraft K1 (600 gramm) which is very ok for trips.

73!
Peter DL3NAA

Thanks for the responses all. I did continue with the build so we shall see how it turns out.

Correction: 38 mv
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73
Karl
KI4ZUQ

One of my inductors was damaged during assembly. It works perfectly.
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Colin - K6JTH?

Here is a scope trace of this buck converter. I cannot hear anything in the QMX from this 5 mv 190 khz saw tooth output:
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73
Karl
KI4ZUQ

Hi,

My parcel also come with damaged inductors. But my understanding of how it works convinced me to build kit. And no issue with power supply in my QMX HB.

We just picked ours up.There going like hotcakes! Lots of interest.
Thanks Hans for your labor and energy and bringing some with you.

James and Dawn?

From your picture, it appears that only a chip is off from those two 331 inductors. If that is all, I can't imagine that it would have any impact on functionality.?
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73, Dan? NM3A

Hello, Steve

I cannot say for QMX, but I tried Bourns 32 and 64 clicks per rotation with QCX and they worked well. But would not recommend to install more than 64 as it looks to fast for QCX/QMX. Current firmware of QMX have some kind of freezing after small steps. It looks like saving something in background and very high ppr encoders might not work as expected.

The 330uF inductor on one of my SMPS boards arrived in a similar condition on Thursday. The coil is intact, so I assume that it will function as intended...

73 de Russ, va3rr

That last question requires a look at my second picture:
The single round hole is for power in. The dual nine pin serial port is not connected to anything. I drilled the hole for the SMA coax connector. So, I guess the question should have been, "Does Hans supply a different rear plate with the WSPR kit?"

Here is a picture of the GPS clock in operation:
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73
Karl
KI4ZUQ

开云体育

I wonder if it was the original two? Postmark date?

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Jim / K7TXA
Eagle, ID

SKCC 10447T
BUG 301

Got 'em today! Arrived about 1300 CDT as we met the mail van coming our way as we headed into town on another matter. They got here in good shape, no boot or tire prints! Thanks and message me here or QRZ.com or email if you need anything!
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73
Karl
KI4ZUQ