开云体育

Oh, no! Not RST again! When will be get rid of that scourge? How about the two-character Maidenhead Field Maidenhead Locator System - Wikipedia<https://en.wikipedia.org/wiki/Maidenhead_Locator_System>

Thanks, Hans, for clarifying that point.? Interesting story of how to solve hardware problems using clever software! But I think the principle of what I said stands: you disable the receiver from

Just thinking about it a little more, if you tapped at the bandpass filter you could utilize it as well. Like at points 1 and 2 of T1. Evan could better explain if that would work. I would have to

Murat, It is a good point that the T/R isolation may not be enough however, I think it is worth a try to measure it. You will get a little over a 3db drop in your QCX receive but I find a panadapter

Hello Peter FYI... the synthesizer drive to the mixer is not disabled completely. It WAS, in the early firmware. However, there was a problem. The DC bias level through the phase shift network and CW

Dear Evan, Curt, Peter, Thanks to all of you for your kind answers and suggestions; I will consider all of them. 73, Murat

I think there is a real problem of the isolation provided by Q5 when the QCX is in transmit.? On the LPF side of Q5 you have around 15V rms of RF and a significant level of RF appears at the receiver

OM ta1db The challenge here is that the qcx does not possess an RF amplifier on receive. It Getz more complex if we still want to transmit the the qcx. Some sort of splitter or coupler takes energy

ta1db, I still do not understand the goal of your project; If you want a Panadapter for the QCX, then the I/Q solution is the most direct and has the least impact on receiver sensitivity. I do not

Something like this, for example..

First of all I apologize for my sending same pictures twice by mistake, I couldn't edit the message didn't want to delete and resend the message either because this may full your mail boxes much more,

Hi all, Next monday, December 12th, is the monthly QCX WARC Party. See https://www.qrp-labs.com/qcxmini/qcxwarc.html for all information. Join the discord page in the #qrp-operation channel to post

Disclaimer: I have not tried any of the following.? I am giving suggestions based on the information provided by QRP-Labs. No RF or IF outputs are available on the QCX+ that an SDR Dongle could

Hello Michael Yes, I have studied the linked discussion thread. And it lead me to my own Yes, that thread was about PSK31. But the same principle applies to CW, it's the same technique for shaping

Mr. Brown, We are trying to learn electronics and how to solve problems regardless of how and where they develop. If we have someone do it for us all we learn is how to write the check...... When

*Mychael Morohovich* -------------------- <toroidguy@...> If you have doubts about the accuracy of the toroid's winding, have it done Professionally, then when you solder and test it, you

Hi, I would like to get an RF receive output from QCX to drive 50 ohms antenna input of an SDR panadapter and I request advise about from where and how I should get this output from QCX. My initial

I ordered one of each of these: https://www.amazon.com/gp/aw/d/B07WX2DSVB?ref=ppx_pt2_mob_b_prod_image https://www.amazon.com/gp/aw/d/B08BLHGWHS?ref=ppx_pt2_mob_b_prod_image They both should work I

Not sure this is your problem, but I’ll share just the same. If it seems right, I’ll try to find the original thread I started. I had two different QRP lab 50 watt amps that would not “turn

Paul, I can work if the output is first low passed (x2) and then put through a power combiner.? It is both phase and frequency sensitive so multiband is likely out of the window (two set of of