Sunday, 16 March 2025

HF

After 8 years without a HF SSB transceiver of my own, I finally got one at Xmas.

A uSDX which covers 3.5 to 30MHz at <5 watts. It draws 900mA max at 13.8v and 80mA on receive.

Set up a dipole in the loft which is resonant at around 7 and 21MHz, not by design, that's just the amount of wire I fitted in there.

Power output from the uSDX on a 13.8v PSU:

1.8MHz = 4.5w 0.74a

3.5MHz = 3.3w 0.51a

5.3MHz = 3.8w 0.65a

7MHz = 3.0w 0.85a

10MHz = 3.1w 0.52a

14MHz = 2.7w 0.53a

18MHz = 2.5w 0.4a

21MHz = 1.7w 0.37a

28MHz = 3.0w 0.66a