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That's a very fine dummy load for general HF uses, but I would not want to make the frequency response any worse especially for calibrating the SWR meter. The method I used (posted on 22 Sep) is

Relative performance would be useful, as long as typical performance is added to the Assembly Instructions or Operating Manual.? It would show obvious mistakes: 1) PIN diodes oriented correctly 2)

I replaced the broken transistors Q107 and Q109. Nothing else has been changed. N ow the SMBS boards work , all voltages are correct: R eceiving seems to work very well after first tests. W hen

Thanks Robert I just corrected that. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl [email protected]> wrote:

Check for a short between the left encoder body and the back of the power socket. It's a very tight clearance. I had to move my power jack out as far as I could and also filed the encoder body for

I thought this was brought up before (and fixed), but I was just showing a friend the information about the QMX and he pointed out this mistake: QMX transmits a SINGLE SIGNAL on FSK signal modes, it

Dear Philip, thank you. I removed the screw. No change. Still a short. Annoying. I am now abroad for a week. 73, Holger DL9HDA.

Hi Bruce: That's a great help...I've had no idea what the commands were. ?I know "man"... but then, I don't know what page to call. 73 de RayK2ULR

"screen" works fine on the Mac.? But, do a "man screen" to (a) see all the command line switches and (b) to see all the key bindings to be able to get to the QDX's terminal emulator's command

I also use *screen* on the Mac, but I must admit I didn't know about the *-fn* option to turn off the Xon/Xoff flow-control, so thanks so much for that tip Ryuji! I could never send Ctrl-Q so I was

Check the screw that holds the BS170s, there is a 5 volt track under it. Philip g7jur

I have checked the S11 of my 20W QRP Dummy Load up to 75 MHz. See the attachment for the results. VSWR 1.06:1 at 40m VSWR 1.21:1 at 10m VSWR 1.53:1 at 4m 73 Bojan S53DZ

Hi, my QMX does not start. When I disconnect all four boards (2x PS, 1x LCD, 1x controls) I measure about 1 Ohm from VDD to ground. Accordingly, a high current is drawn. I applied 1V and at 500 mA I

I use screen (/usr/bin/screen) on terminal, like: $ screen -fn /dev/cu.usbmodem?????? You need to find the device file name of your transceiver. -fn switch is there to disable flow control, since

Thanks Kees! I’ll order some immediately to experiment with. Thanks for the heads up. Tony

For the plate supply, consider the $5 boost converter available on ebay (search term "390v dc boost converter").? I used this to provide B+ for a vintage receiver from a LFP battery.? The output

Now on RX bandpass filter. My design worked largely as intended, although the filter peaks may be a bit off on some bands from 60 to 15m. For some reason, the BPF for 12/10m is behaving very

Me too. We'll see if this has really solved the issue after a week or two of use. 73, Cliff, AE5ZA

Using my filter and transmitting at 18.068MHz, the second harmonic is about -55dBc. This is about 10dB better than the second harmonics of 60m and 30m through the stock filters (they are at about

So I just got my Mouser package arrived so I assembled QMX for real. I skipped the 80m LPF but installed my filter in place. I also skipped BS170 but installed LDMOS AFM907NT1 x 2 in place. I just