I have a 13CM Spectrian amplifier board which I believe is about 60 watts output this is the board with the three LDMOS devices.
The one thing that I can’t find is the connection details. I have tried using Google lot of pictures but no real useful information that I have found.
Could some tell me the following info?
Bias connection and bias voltage and what to set the bias current too.
There is also a small 10 pin header again is there any useful information i.e. fwd /ref power or temp?
Any pointers or links to find the information would be most welcome.
73 Keith GU6EFB
Hopefully you can find it here.... https://www.dropbox.com/s/xi461e7oa1rnl ... p.pdf?dl=1
I recall removing the PA devices from many of these boards but there must be many still in people's storage. I only have one left, it is on a DB6NT blown heatsink just about able to handle the extreme inefficiency - I might as well see if it is any use for my QO-100 portable station.
The mods described in a recent BATC News do increase the output at 2.4 GHz. I can get about 55W from mine running at 19V when it is cold. But that drops to about 45W when it warms up.
Look forward to working you all on many of the ATV bands we are slowly getting closer to being able to TX on many of the bands.
73 Thanks again Keith GU6EFB