[CQ-Contest] Pre tuned Hf amps
df3kv at t-online.de
Sun Sep 24 17:04:07 EDT 2006
I would never want to change monoband amps to a single or two "autotune"
Optimized homebrew monoband amps are the far better solution:
- much better components, never bandswitch failures
- better efficieny
- usually better harmonic reduction
- no single point of failure
- more power
- instant switching of bands, no tune at all
- much cheaper
As an alternative, I am in the process of building an additional three band
amplifier for the low bands, 3 Pi-L output circuits, switched in by vacuum
switches and a common input.
No antenna relays necessary since receiving antennas are separate.
This one is to feed additional antennas and will be driven through a ratio
adjustable power splitter.
My amplifiers are not in the shack, except those with radiation cooled
I just monitor automatically SWR and overcurrent states which drop the
ptt-line in case of failure, or automatic shutdown of voltages if necessary.
I think this thread will be better discussed in the amp reflector
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] On Behalf Of Eric Hilding
> I'am looking for some information to put an hf amp in an other room I
> thinking to build monoband amps who are pre tuned and no need to
> retune if you go from ssb part to the cw part of the band.
> Has any one done ths before?
> How do you make the protection/feedback to the operator if something
> goes wrong?
Why re-invent the wheel? Get ***ONE*** "Auto-Tune" amp. ACOM, ALPHA or
check out the new Elecraft KPA amps ("coming soon" :-)
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