On Sep 26, 12:14 am, wrote:
This may not seem like a "homebrew" question, but it is!

I have a Kenwood 440SAT which is failing, but the AT (Antenna Tuner)
is still working. Since the 440SAT can (could) also be purchased as a
440S (i.e., without the AT), the AT may be a stand-alone "module", and
I'd like to remove it and package it separately to use with a new radio.


It would be a lot of work, for a somewhat mediocre result....and
speaking from working on the ATU in several TS440, here goes...

The tuner band switching is done via the radios CPU - could be hard
wired via a switch. But that sort of defeats the concept of an auto
ATU - still, amateurs have done weirder things than that before...

The SWR/tuning sensing is inside the ATU, no probs there...it does
feed back to the PA as a high SWR protector, how to use it would
require some thinking...

BUT the thing has a fairly limited tuning range anyway - its small,
has to fit inside the radio, so its ability to match to a wide range
is not very good (cant remember the figures)

Why not just fix the radio? - they go fine, have very little
commercial value so ideal mobile/backup radio - no great loss if its
stolen out of a vehicle. The Kenwood manual is excellent, easy to read
to fault find, and there is even a YAHOO group devoted to the beast...

73 de VK3BFA Andrew.