[Motorola] MICOR repeater UHF

[motorola@mailman.qth.net]

Hi Glenn,

Perhaps something to do with the 'reverse burst'
timing or decoding circuits ?  Just a thought.
Have never worked on the UHF Micor, but I seem
to recall something in the manual for the VHF
that mentioned that.  Have a look under "FUNCTIONAL
OPERATION" (subsection 2 in the "Private Line"
encoder section) of the manual and that may shed
some light on a solution.  I don't think the DPL
units used 'reverse burst' so there may be another
'module' that needs to be added.

Perhaps those pages will lead you to the 'complement'
segment in the receiver section, and the adjustments
might be near that for adjusting the tail (even when
not using CTCSS).

Just noticed, in the rcvr section under 'rcvr audio
and squelch board' that there is a "long squelch tail
circuit" and an accompanying 'defeat' circuit just
downstream from the detector tha follows the 2nd Amp.
This is followed by the "Carrier Squelch Switching
Logic" and the "Squelch Control Logic". Have you
investigated any adjustments in those ?

Please NOTE!  All this info from the *VHF* Low manual.

Btw, does anyone have a "Portable Test Set",
as described in the Micor VHF manual, that
they'd be willing to part with ?

73,
     Bruce

On Sun, 24 Mar 2002, Glenn Little wrote:

> We now cannot get rid of the squelch taiol on the repeater.  The repeater 
> was originall a DPL encode and decode unit. We are using it as carrier 
> squelch.  We moved the obvious jumper to convert the unit from DPL to 
> carrier squelch.  Does anyone have a list of what has to be changed to get 
> rid of the squelch tail?  Any help greatly appreciated.  This repeater is 
> used to link a number of repeaters together and the squelch tail is 
> anoying. We do not really want to use PL as the decode time chops the first 
> word.