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Thanks for posting this!? It's been AGES since I've seen it.? Is 'Niagara Falls' strictly a Three Stooges skit or have other comics done it, too?

Added to the output of the Hyelec PS-28A is a 12 VDC, 3ADC, 50w zener, the NTE 5254AK, mounted on a 3 inch x 5 inch extruded aluminum heatsink. Well, so far, so good. I shouldn't be breaking any more

Steve, Oh, OK then my thought of a U3S defeats your purpose:-) Best of luck! 73 Alan

OK so you have a different problem then I do. My QMX just stops transmiting WSPR after 10 hours or so even though the display still shows the transmission when the time comes. I have noticed this all

Alan, WSPR Transmit only. My idea is to get the QDX to transmit WSPR on a frequency and at a time determined by a microcontroller rather than a computer. This would allow the automation of a multi

Hi Pawel Sorry I don't have any schedule for firmware releases. There are LOADS of things going on here all the time and it's hard to guess from one day to the next, when I might have time for some

The power reduces as the input voltage does - IIRC the ‘raw’ supply runs the last few op amps on RX, the backlight and the PA. The limit is around 7V into the 5V regulator which is more like 7.5

SOTAbeams, a company in the UK, sells a "Milliwatter extreme" that is a 5 watt, 50 Ohm attenuator, with a choice of 10 dB or 17 dB attenuation. The device attenuates the transmission, but bypasses for

Winding a toroid is more like this... https://youtu.be/MYP1OBZfFK0?si=OF3Iifb3XMsnPK_K

I run my qcx+ at 8v with 1 watt out for wspr. somewhere between 8 and 7 v the rig display starts to fade on tx. My mini will run down to 7v but is still doing 1 watt at that point. I too would like to

Wind a Toroid? ?Slowly I turn, step by step, inch by inch….

I did not mention my 5th QDX, a V5M for experimenting. It is on a breadboard with a 317 regulator for the PA. I was running at ~1 Watt 5 volts on the PA. I've just tried 2024-02-26

What should be the resistance between +12 and ground? I have open circuit which is obviously not good, and the PA is not working. Maybe I have fried a mosfet while soldering since I had a nasty solder

Hi Paul M1CNK Thanks for the feedback, I have corrected this for the next version. Hi Robb K5RAB: I checked, and you are right, a typo! It had "DEV" instead of "DEC"... so I have fixed this for the

Morning, That’s for the information, really appreciate it. Have a great day.? 73John W9QP? Sent from AT&T Yahoo Mail for iPad

Hi Eric, assembly_1_02a.pdf on page 36 shows a picture of L401 with "an example of the wire spacing we have found to work well," Maybe this could help. 73, Ludwig

One additional Information: at least 56 dB up to 35 MHz at least 59 dB around 42 MHz at least 61 dB above 50 MHz So it's fine according to regulations.

Steve, Like Evan I've built mine for 12 volts, run them at 7.5 volts. As I only want 1 watt for WSPR I also have 2 or 3 diodes in series with L14. 4 version 1s, run this way obviously no problem, no

Hi Andy Thanks for the feedback, I added your observations to my bug list to investigate. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Steve, I still have my Rev 1 QDX running.? It is built for 12 volts, but I run it between 8 to 10 volts.? That, to me, supports Hans's statement.? The one mod that I suggest is adding a 1n4148