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Re: [Amps] Transceiver Output Impedance

To: "'Robert Carroll'" <>, <>
Subject: Re: [Amps] Transceiver Output Impedance
From: "Peter Voelpel" <>
Date: Sun, 9 Mar 2008 03:18:01 +0100
List-post: <">>
For maximum power transfer the output impedance and the load must be the
Above and below that value power drops.
The internal low impedance of a solid state amp is converted to 50 Ohms by a
wideband step-up transformer


-----Original Message-----
From: [] On
Behalf Of Robert Carroll
Sent: Sonntag, 9. März 2008 01:10
Subject: [Amps] Transceiver Output Impedance

I have been told that modern solid state HF transceivers have been designed
to deliver rated power into a stated load resistance-almost always around 50
ohms-but that their effective internal impedance looking into the output
port while it is active and delivering rated power is nowhere near 50 ohms
but rather closer to a few ohms if you can define such an impedance at all.
Is this more or less accurate?  I ask in connection with the 87A input match
problems Rit Nesbitt mentioned a few days back on this reflector.



Bob W2WG

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