[Amps] Transceiver Output Impedance

[Peter Voelpel]

For maximum power transfer the output impedance and the load must be the
same.
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

73
Peter 


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Robert Carroll
Sent: Sonntag, 9. März 2008 01:10
To: amps at contesting.com
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.

 

73

Bob W2WG

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