"Allan Butler" wrote in message
news:mRmEb.595184$Fm2.545419@attbi_s04...
Hi there.

Another Amateur that is involved with volunteering with schools and such
is
looking at launching a baloon with an HF transmitter on board. The band
of
operation is 80 meters. He is looking at some type of a beacon that will
send data via BPSK modulation and needs 10 to 20 watts of transmit power
at
the output port. For an input to the unit he has 0dBm or 1 milliwatt of
RF
at the operating frequency.

This looks like it would require 40 to 43 dB of gain to get to the level
that he needs for output.

Does anyone have suggestions of places to look on the web for application
notes and/or schematics for amplifiers along these lines?

I have done some searching on Google and found a few things but most of
them
take inputs of 30dBm or so and only take that level up to 40dBm. He still
needs to bridge the gap from 0 dBm to 30 dBm in that instance.

Any information that you can help with is greatly appreciated.

Al Butler
ka0ies

Here are the web page links for High Altitude Ballooning

http://users.crosspaths.net/~wallio/HABLinks.html

Ralph Wallio, W0RPK is a good resource
http://users.crosspaths.net/~wallio/

W9GB