[TheList] UBC-9000XLT Fault

Wed Sep 18 05:04:30 AEST 2019

That's a little like asking where is the needle in this haystack! Best 
guess would be either the reference oscillator crystal is crook so the 
PLL/VCO is unable to synthesis the correct first local oscillator or one 
of the other local oscillators isn't working, but it could be anything 
really. Unfortunately if I recall correctly the IF's and subsequently 
LO's are slightly unusual frquencies. But it could be anything. My 
UBC9000XLT is still going strong despite all my mods ;-)

Get an RF Tech to look at it.

:-)

On 17/09/2019 8:28 PM, Mike Trump wrote:
> Hi Folks,
> How many of you guys own one of these scanners?
> I've had mine for about 6 years, it has all of a sudden stopped 
> receiving anything at all.
> A couple of years back, the squelch stopped working (as in wide open 
> all the time),
> so I installed a discriminator tap to run PDW for Fire Paging and 
> turned the volume right down.
> Now, the thing is as deaf as a post, I opened it up, couldn't find 
> anything obvious, put it on
> a signal generator and a 'scope, as well as an audio signal tracer, it 
> all tests out fine, yet if I
> trigger a VHF handheld next to it, with a simple aerial connected to 
> it, it doesn't want a bar of it.
>
> Any thoughts?
>
>
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