QSX? That will have a 10 watt output natively, per the spec, and won't have any need for a 10W linear PA. Julian, N4JO.

It's all mathematical so far, Bernard, I haven't built one yet. :-) Will do when QSX is there.

Thank you very much, it's actually a very good idea to use a a tenuator to respect the impedance of 50 Ohm.73 dear friend.

When you connect something to the 10W amp to drive it, you want to make sure that the driver device sees a nice friendly 50 ohm load. One way to do that is to use a bit of attenuation between them;

Thank you very much Jens for the information. Did you encounter any particular difficulties during the construction of the PA? Thank you. Bernard.

Bonjour Bernard, other group members helped me with the same question, so today it's my turn: 10W, minus 26dB –> 25mW Best wishes Jens

Hello everyone, can someone tell me what level of power should one inject at the entrance of the PA 10W to actually come out 10w? thank you in advance for the intelligence. 73 QRO

Merci beaucoup de m'avoir accepté dans le groupe. Je construit beaucoup et je viens d'acheter le PA10 W + les filtres de bandes. 73 QRO

Hi Cathal... I am comparing a sigle band U3S with 5 watt PA kit and a multiband U3S with a 5 watt PA kit Doing the comparison i used the same 10M LPF  as well as the same 5 watt PA kit for testing

Dear Jakob, I have a documented 1uW contact on QRSS for 1,164 miles between me and W4HBK in Pensacola, Florida back on May 17, 2014. QRSS and other weak signal modes do travel much farther than we

Jacob, I’m not surprised at your success. A while back a number of us participated in the “Under 1mW Challenge” which was a totally informal fun event. My U3S here in California was heard all

Hi Vernon, Just to clarify. You have one U3S kit, built with the LPF relay board, and with the PA unit inline between the U3S and the LPF, and another U3s kit built as a single band but also using a

Hi Jelle, Warren I changed the Palm Radio link to http://palm-radio.de/ which works, as you say; this way if Palm do anything with the website then the link will still be useful. Yes but it does say:

Hi Hans, The link points to a blank/dead page. This one does still work, http://palm-radio.de/ Regards, Warren.

Hi WSPR fans, I built a U3s a few months ago and run it now with about 1 watt on 40 meters. I usually get quite some DX spots in Australia, NZ, Japan, Brazil, Europe, and sometimes Antarctica and

Hi Hans, Just noticed:Page 155. R36 is missing from diagram. C21 is in the 5.7 CW filter section. But R36 is mentioned in the text of section 5.8 but not shown in that sections diagram. Sorry,

Hi David Yes correct, thanks. I have updated it in my local copy. Any other errors detected, anyone? 73 Hans G0UPL http://qrp-labs.com

Manual correction? I think that on p89 the image on the upper left hand side should also have a pointer to the spacer (M3 7mm) between the back of the front panel and the LCD module PCB. dave k2lyv

Hi Gary, Dave Yes, we already started shipping QCX+ kits. Starting with the people who didn't need the LCD, and moving through the others in chronological order. Packing and shipping takes time. Our

For those that havent read the mail... Apparently there was a missship of the display. so that delays shipment until the correct ones are had. see link for