I have built up my 9V-QMX 60-15m with TN0110 - the rounded side was ground flat, the top side was provided with an additional cooling plate, LPF-coils optimized.?
The information comes from the terminal control display (current from the power supply, temperature sensor)
Operating voltage 9.6V, at the finals 8.2V
Current consumption 0.9A (17m) to 1.1A (20m)
Output between 5.2W (60m) and 5W (20m), 18m 4W, 15m 4.3W
Power loss at the finals 1.7W (60m) to 3.33W (15m) increasing. (= ((IinTX-IinRX)x8,2V)-Pout)
So far I have not seen any clear differences to the BS170
My temperature test for 50°C of the cooling surface (the permissible Id and the power dissipation drop to 80%) at 25°C room temperature:
In CW no 50°C are reached with a CQ loop.
In FT8 no 50°C are reached with CQ loop from 60-20m, but on 18MHz after about 14x CQ and on 21MHz after 7xCQ
A test with Olivia (Fldigi, passes up to 2min) on 17m was aborted immediately due to the rapid temperature increase caused by the long transmission cycles.
Test with TinySA: Lowest harmonic attenuation -48dB on 60m, otherwise at least -56dB, sensitivity between -118dB (21MHz) and -128dB (7MHz) at approx. 10dB S/N, CW
I am satisfied with my QMX, I use it mainly for CW and some FT8
73 Reiner
dl8lrz Reiner