[amsat-bb] Re: Amplifier Suggestions?

g0mrf at aol.com g0mrf at aol.com
Wed Sep 21 14:52:25 PDT 2011

Hi James.

That is a lot of gain.  10mW to 75W is around 38dB.
If I had this as a problem, I would consider putting two amplifiers together.

For example

But include a small amplifier 'brick' to get the drive up from 10mW.
Perhaps the M57721M from RF parts in California.  10mW in and 7 Watts out.

Of course with just 10mW input, your amp will not automatically switch from RX to TX. - Best to switch manually and not with RF anyway.

Second choice would be to make an amp from scratch. - A quick look at RF parts again shows 50mW to 60 Watts is available in a single device. - RA07H4047M.  cost is $23 but then a box and some relays and a LPF will be much more than that.


David G0MRF




-----Original Message-----
From: James Cutler <jwcutler at gmail.com>
To: amsat-bb <amsat-bb at amsat.org>
Sent: Wed, 21 Sep 2011 17:32
Subject: [amsat-bb] Amplifier Suggestions?


We are looking for a UHF amplifier (430-440MHz) for a transceiver to go from
10 mW to ~ 75W.  Most of the amps were are funding require a much stronger
input power than we can do. Note, it's a transceiver, so we want to be able
to receive through the system as well.  This is for half duplex satellite
communication using a USRP radio.

Do you have any suggested amps?


--James, KF6RFX
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