Hi Chris - I built a linear PA for 136 kHz (I wanted it linear so as to run PSK31). It uses four bipolar output transistors (two MJ15003 and two MJ15004) in complement ary parallel/push-pull class AB
WE0H writes: Can you describe his loop and loop tuner box? Hi All - Now that I've sorted out my access to the Reflector I'll try to describe what I'm using. The loop is relatively small !! It's 9.5m
What circuits do they use? How do they ensure they are linear? What efficiency do they get?> My amp uses a darlington pair/PNP-NPN complementary arrangement - much like some early audio amplifiers. O
Well at least Markus, DF6NM, and myself (working at the club station DF0WD) can [Tx PSK]- using linear power amplifiers. So looking forward for the next weekend, though I am not very convinced to be
My question about linear amplifiers sparked some useful dialogue about eliminating the need for linears. If a new data mode is to be developed, it seems to me that two modes are needed. One for 'loca
Hi All Sorry if this lengthy message is a bit controversial but I feel I ought to comment on some of Mal's statements: Normal RTTY would not be acceptable on LF this has been discussed many times bef
