> "WD7F - John in Tucson" <[EMAIL PROTECTED]> wrote:
> It's obvisouly not aligned properly. I can turn it
> a tad CCW until the noise increases (possibly going
> into oscillation?) and breaks the squelch and then
> turn it back a hair CW until it stops. I can see
> the audio noise change when I hit the spot where
> it goes haywire.
The only proper L201 adjustment that I know about is
described in the Service Manual, completed with the
proper test equipment. I know it reads kind of hard
nosed, I'm not trying to be. Now that you've
adjusted the coil, you need to align it per the proper
instructions. This is such a hard (ie read pain in
the arse alignment to complete, that I don't recomend
anyone touch L201 unless they know there is a problem.
Since you bought your repeater second hand, there is
a chance someone else touched the adjustment.
> I have listened to this repeater for a few months
> with my trusty HTX-202 so I "earballed" it and left
> it until we can get to it. We will do the alignment
> again according to the manual soon.
>
> And you said:
>: As I describe in my text, above
>: 3.5KHz (service monitor) deviated test input, the MSR2000
>: receiver filters start to distort the audio. You can see
>: it with a scope at the discriminator output.
>
> I say:
> Yep, you're perzactly right. However, on our second attemp
> to set the deviation back in March, we did have it looking
> pretty good up to 5K looking at the audio at the input of the
> controller.
> And it tracked pretty good up to about 3.5K. It held still
> for a couple months and then we had the Channel 11 spur
> that drove us crazy. It was so strong, I thought the
> repeater was broken. One day, there was noise getting through
> with the antenna disconnected.. During that episode we
> tweaked it again and probably
> messed it up.
Do you use the exact shielded wire I mention in the text..?
(from the external controller to the squelch gate module)
Are there nearby high powered transmitters? TV or Broadcast
Radio?
> Final comment:
> Walt, WA4LDS and an engineer at Channel 4 here in Tucson noticed
> that when the picture changed on our local Fox channel, the
> repeater noise changed. He was instrumental in getting the Channel
> 11 engineer to tweak his
> transmiter and it is all better now.
> Thanks for the response.
> de WD7F
> John in Tucson
Wow, quite the story...
You should be able to check the repeater for proper operation into
a termination (load). If a gremlin appears when you place the
repeater onto the antenna system, you'll probably know where it's
comming in.
cheers
skipp
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