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Don't confuse the DC input with the power dissipated in the finals. Power goes elsewhere, and (hopefully) a large fraction of that power goes out to the antenna (and does not come back). 73, Willie

Strangely enough, just ran across this picture of my Decwriter II (300 baud! 30 characters per second!) that was hooked up to my S-100 machine running CP/M. Had one in high school that was a _serious_

Hi all, The outcome of my tests with the QDX connected to the 50W class C PA (for FT-8) is as follows: - QDX with T1 3:2, operated at +10V DC - 50W PA operated at +18V DC - direct BNC 50 Ohm

HP stuff was always my favourite. They seemed to have a habit of collecting around my workbench. At least the boss always knew where to come if he needed one ;-) -- - 73 de Andy -

Hello all, I'm curious about the general consensus for setting receive audio levels on the QDX. I've been using WSJT-X mainly in FT8 and FT4 with an occasional check in WSPR. I like the fact that QDX

One key point to remember is that the manufacturers spec sheet doesn't quite tell the truth in reality because to save their butts they deliberately underspec the ratings. I can prove that by saying

Oh dear... seeing VT220 mentioned took me down the nostalgia terminals trip... ASR33 on a DEC-10 at university ADM3A on Prime750 at university. ( 32bit supermini similar to a VAX 11/750 but completely

Hello Ken It's like a Morse key. The transmission stays on only while you hold the key down. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl wrote:

Anyone else have this problem? The operating manual says’ The following keys are used in the Transmitter test application: + increases the band - decreases the band p Enable PTT (Highlights in

Hi Hans, Thank you for the clarification.? I have only used the QCX+ rev 1 with my 50watt amp, which I used for my reply.? The others are for different bands, so I did not try them.? I will be sure

Hi Evan That's right, but QCX+ and QCX-mini also have a straight-through cable, the same. Only the Rev 1 PCB of the QCX+ had tip/ring reversed (my stupid mistake); all subsequent PCB revisions are OK.

High Andy, Unlike the QCX, the connection of the QDX to the 50watt amp uses a straight-through cable.? Since the Roing is the +5volt PTT signal, you do not need to worry about the tip connection.?

Hi Bela, I would first check that the low-pass filter selection is working correctly.? You measure the voltage on the banded (cathode) side of the six diodes used to select the filter.? ?The two

Hi Andy, I agree with Alan on RF being the issue.? I had the problem with an off-center fed dipole where 40 had no issues, and 20 had a lot of RF on the feedline.? Installed an ugly choke (6 turns

Andy, Typical symptoms of RF getting in. Some manage with ferrites on the USB cable but best to reduce the amount of RF in the shack. (Consider antenna configuration.) 73 Alan G4ZFQ

Hi, up to 150 mA is ok with v.3. 73 Bojan S53DZ

I have built my QDX all is working fine. But it taking 150 mA on RX. The spec said 100 mA. Philip G7JUR

I struggle with low output power on some of the bands. 80m: 5W - OK 60m: 5W - OK 40m: 2W - not OK 30m : 3.8W - not OK 20m: 2W - not OK I did reduce the L4, and L10 (LPF3) also L3 L8 (LPF2) inductors

How about this one:

Hi Folks, is there anyone here who is thinking about adding a bluetooth interface for QDX? This could improve the portability of it. QDX could be deployed very close to the antenna with some battery