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I'am using ATU-10 from the beginning of QDX Very happy with it, at home and at remote QDX, Hermes lite 2, ICOM 705 Battery lasts forever I also have an ATU-100 (not good for QRP) and a ATU-100 OGS-3D

I got one of my last three orders from Aliexpress. Now overall, the whole pile was cheap enough that is was okay. I intentionally ordered the parts (a bag 'o 9 MHz crystals) from two different places

No need to build "everything", just what you need. Getting components is very easy now, there has never been a better time. Cost will be low if sourced properly. If you are going to build stuff then

Very true Hans.? I have bought a lot of stuff made in China, usually there is no other source. I dealt once with Alibaba and had no problem. I would not use Aliexpress ever again and am wary of

Hello Alan I'd really love to believe it but still find it impossible to do so. All the maps in the document are criss-crossed by "WSPR links", many of which are marked as various types of "anomaly".

Sorry, I meant 150?°C/W. -- Julian, N4JO.

As has been said by one or two others as well as me, the package of the BS170 has a very high *thermal resistance* - 100°C/W (meaning that in free ambient air, the junction of the device will

Jim, Thanks for the update. You are drawing more current on TX, so that's a good sign. Are you getting spots on 10 meters with both the 10m and 6 meter LPFs in the chain? If so then things should be

WSPR isn't a communications protocol, you don't have conversations with it. And it isn't a competitive sport. The value in WSPR is to get a relative measure of current atmospheric conditions, to give

Al, I put the six meter LPF back in slot 1 and put the U3S in the lower part of the case and my harmonics on other bands are down and the output does not seem to be impacted. Best I can tell on 6

Hello Bertel, I have an ATU-10 and other ATU's. The ATU is not a problem, however the output stage of the QDX won't like wild impedance excursions whilst the ATU is searching for the best setting. I

The metal washer is NOT the heatsink, the washer only serves to hold down the transistors on the PCB copper with IS the actual heat sink.

The design of the PA in the QSX-Mini is not made for an on-time of 2 minutes at maximum power. The washer-screw heatsink can absorb some power, but it cannot get rid of it with convection or

There are two holes to the other side of the board, being a smart and lazy person I used them. So correct not soldered to the pads Current limiting, you are right, hopefully Hans will include this on

That's pretty clever! So those wires are running _through_ the board and not soldered to the pads? I like the 'both flavors of PTT on one connector, but shouldn't there be some current limiting on the

HOW TO GET PTT FROM QDX As promised, With Hans's help of course Do it on your own risk! Lot of silicon souls wasted, I take no responsibily, Most probably I might be mad. Don't listen to a mad person.

Well, FWIIW, I have been running my mini on 40 meters WSPR for about 18 hours. I did drop the voltage to around 11 volts. The case shows no increase in temperature for me. Similar performance with my

It comes down to - in all good conscience. I'm waiting on an enclosure from china. Is that really necessary? Let's start there. Also, do I call turkey a friend? Not on your life. Something is not

Mine, 40M- QCX+, has been sitting for a few months but no longer... I started with a bare board yesterday, working through the construction book which begins by winding the T1 transformer. That's a

Instead of all the hoohah about QCX mini overheating of BS170’s, if you are going to use modes that have 100% duty cycle, why not run the mini on 9v, the power drop at the finals will not be noticed