Sure, I can help... Look up the receiver coil preset
charts in the service manual and reset every coil to
the factory preset. Then align the receiver using the
manual steps in the proper order.
Most people will only "retouch" the front end helicals.
You need to do the entire realignment from scratch (out
of adjustment) to properly align the injection levels.
There is one or or two very small peak/dip adjustments,
which can be missed. One must stare at the MSR
alignment box after a cup of good coffee (not evil
empire starbucks) to not miss one of the small peaks.
Aligning the receiver with all the coils out of
adjustment (presets) is quite different than a touch
up, where the coils are somewhat near their final
values. The injection change levels are different and that
makes a difference.
The MSR / Mitrek Receiver taught me not to fudge the
complete alignment.
cheers
skipp
www.radiowrench.com
> "n9wys" <[EMAIL PROTECTED]> wrote:
> Our repeater is an MSR2000 UHF model, Model # C74GBS3106BT. It was
> originally at 460 MHz, and we tuned it down to 444.550 / 449.550.
> Our problem is - we are only getting about .6 µv to .7 µv
> sensitivity in the receiver, and this is when feeding signal
> DIRECTLY into the receiver (no duplexer). If I remember, the manual
> says that nominal sensitivity should be about .2 µv... The tuning
> coils are bottomed out, so we have no more tuning available with
> which to improve the receiver.....
>
> So, my question is: Does anyone know if there is any different
> receive boards available, other than the TRNE6262A ? If so, can you
> advise what the part number would be? I would think that Motorola
> MUST have made UHF repeaters lower than 450 MHZ, but I can't seem to
> locate any part numbers for receiver boards for any of those
> machines. (We called Motorola parts, and this is the part number
> for the receiver board they say belongs on our machine - of course,
> it's for 450-470 MHz range, which is what is specified by our model
> number. They were no help with whether there is any other receiver
> board available for any other frequency spread. Plus, the TRNE6262A
> is no longer available, anyway.) Also, my manual is not
> complete... We have all the sections for the transmitter, but the
> receiver stuff is all VHF. :-(
>
> Otherwise, I guess a modification is in order, and I'm not sure
> where to look for that.
>
> Can anyone point me in the right direction?? I'd be much obliged!
>
> Thanks!
> Mark - N9WYS
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