On 2022-01-01 13:12, j...@kk9a.com wrote:
I follow the SPE Expert list and I never understood their reasoning for
running 100 watt radios at full power and relying on ALC to control the
output. I never use ALC.
*** I am building a 600W LDMOS linear. An input of 5-8 watts gives full
output.
The maker of the RF deck ( dxworld-e ) recommends putting a 10dB
attenuator at the input, to get a better match to the typical 100W
exciter and protect the LDMOS.
I was reluctant to do it, because I'll be throwing away 10dB of gain
and also
putting more heat inside the box. But I do want to preserve the
devices. So I
ordered a 10dB resistive attenuator on Ebay - it just looks like a flat
ceramic pack with a lead at each side, and a plate to bolt it down.
I'll bolt it to the linear's
big heatsink.
- Jerry KF6VB
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