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Subject: Re: OT: RF Dummy Load
Date: Sat, 04 Jan 2003 10:48:06 +0100
NNTP-Posting-Date: Sat, 04 Jan 2003 10:48:06 MET
Jim Backus wrote:
> There are lots of suppliers of low power dummy loads. Try
> Making a load with a low reflection coefficient at high frequencies
> using normal leaded components is not easy. Carefully made loads are
> OK for frequencies up to 150 MHz or thereabouts.
A long, thin coaxial cable is not a bad start as a dummy load. Put a not so
perfect resistor at the end, and that resistor has only to handle a fraction of
the power, if the frequency is high enough.
And whatever that resistor reflects is also attenuated by the cable on the way
back into the transmitter.
It takes a long cable. But it can be lousy quality.
BTW what happens to the impedance if cable gets damp inside?
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