It's usually the case that 80% of the time there's a problem, it's
in the wiring/connectors. Another 10% times it's a cold/cracked solder
joint. Unless it's something benign and independent like a sidetone
adjustment or dimmer pot, for Pete's sake don't twiddle it! Having
designed a whole slew of analog and digital circuits, I can assure you
that there is usually an interdependency between them and they can usually
be really twitchy. I screwed up the squelch adjustment on one of my
radios and had to borrow an RF generator and obtain required pages from
the adjustment manuals to fix it. Unless you've got the adjustment
procedure manual, don't touch.


Mike Noel wrote:
: I forgot to mention the radio types. They are a mix of Bendix and
: Bendix/King. The Nav1 failed to register glide slope information at one
: airport, but seemed to work fine a few minutes later at another.
Check for loose wiring.

The Com1
: started receiving fine after rotating the frequency selector knobs a few
: times, but still has terrible audio quality during transmit.
Sidetone or actual transmission (from received radio)? Check
overmodulation on mic if it's actually bad transmission.

Not sure
: wether it is the radio, the audio panel or something else. I wanted to take
: my best shot at fixing these guys before resorting to an avionics shop. I'm
: not entirely ingnorant in these matters since I was an avionics tech in the
: army but have since moved on to other things.

: --
: Regards,
: Mike
:
: "Sven" wrote in message
: news:Hd79b.443485$YN5.299972@sccrnsc01...
: "Mike Noel" wrote in message
: ...
: I'm pulling out my older RF gear 1 by 1 to use a little Radio Shack
: contact
: cleaner on the interior switches. On my Nav radio I noticed a bank of
: rotary resistors (guess they are resistors since they are labeled R1, R2
: etc.) and I am tempted to treat them and turn the pots back and forth a
: bit
: to make sure they're clean. Does anyone know if they are too position
: sensitive to set back into their original positions by eyeball? Any
: other
: comments about using or not using contact cleaner are also welcome.
: Thanks.
:
: If these are trim-pots that are mounted inside the radio and aren't
: normally
: adjusted during regular radio use, I'd recommend leaving them alone! They
: shouldn't need cleaning if they aren't moved. The contact cleaner is for
: cleaning the pots that you use such as the volume control.
:
: Are there problems with the radio??? If it ain't broke, keep your f'ing
: mitts off! Leave it for your avionics tech...
:
:



--
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* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
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