re: KLM Amplifier info
A few years ago (more like 10 or 15), bare boards from
the production line of KLM were being sold by HSC
Electronics (a chain in No Calif.) The circuit diagram
was provided for the two or three power levels related
to the two boards sold. I probably still have the copies
I received and can probably provide them to patient
people who really need them.
Although some might have been class C, there are
many known conversions "out there" and one can
easily be lifted from another similar design. I have
converted class C amplifiers into Linear operation
by adding a bias network and output filter tweaks.
The possibility is determined by the actual devices
in the amplifier. Some emitter balasted transistors
don't operate in linear modes. I have modified
and "forced" commercial two way PA's into linear
operation with very mixed results, some devices
just don't work well in linear ckts. I had a bit more
luck with less specialized transistors.
The devices in your klm should be looked up and
to determine if they will operate in linear
modes, hopefully you will find the power devices
have more than house numbering labels.
Some suppliers have Cross Ref tables to work
The bias circuit is "relatively" easy thing to add.
--------- Forwarded message ----------
From: "Floyd Sense" <firstname.lastname@example.org>
I picked up an old KLM 435MHz "brick" amp at a
hamfest last weekend, with thoughts of using it for
satellite work. The model number is PA 15-110CL.
There was no paper work with it and I've come up
dry searching the Internet for info. It occurred to me
later that since the amp was originally intended for
FM work, it is not necessarily a linear amp and
might not be suitable for SSB work. Can anyone
provide info on this KLM amp? (OK, so it doesn't
have any glowing bottles inside - still an amp!).
K8AC Floyd Sense - Angier, NC
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