V85NPV - (tr)uSDX using a micro PA50 , ATU-100 and long wire Part 1

I Have built my own USDX and working decently but the (TR)USDX is really more convinient regarding its size.
I bought the device from the official seller as a kit a and manage to achieve above 83% of efficiency for the Class E amplifier (About 91% on 30m).
www.aliexpress...
In addtion i am using a Micro PA50 tiny amplifier and ditto far more tiny compare to my homebrew one . This amplifier is able to provide up to 50w but mostly i am using it from 30 up to 40w . I add an additional fan on the of the IRF530 mosfet to enhance the cooling.
www.aliexpress...
I am using this combo with a tiny N7DCC which is perfect to tune my long wire antenna.
The overall combo is for my outdoor activity but can be used obviously in static posture in my shack. Overall performance is great.

[@brianfields4479]

Great video. I really like the micro pa

[@fabd4103]

hello, I have a long wire around 20/30 m and the (tr)usdx QRP, plus of my FT818ND (I ever have the tuner LDG Z-817 for yaesu). However, seeing your good video, I would like to by the ATU-100 for the (tr)usdx. Is the unun 9:1 necessary or without unun the tuner direct to long wire work well? thanks by advance. 73/88 Fab.

[@f5npv-v85npvamateurradio3]

The ATU shall be located outside the shack close to the antenna. Therefore i never try the ATU100 with such configuration. you will need to try

[@honeybadger6127]

how do you keep the (tr) uSDX from over amping the PA50... how do you lower power on the (tr) uSDX?

[@f5npv-v85npvamateurradio3]

i just go use the bias menu and reduce it (max biasing).

[@honeybadger6127]

@@f5npv-v85npvamateurradio3 - is that menu 8.2 PA Bias max?

[@honeybadger6127]

how long is your long wire antenna?

[@f5npv-v85npvamateurradio3]

30 meters long with 1:9 transformer

[@honeybadger6127]

@@f5npv-v85npvamateurradio3 - were you able to work 160m band?