> "Brent" <[EMAIL PROTECTED]> wrote:
> or better yet I had a trident ltr controller
> on a uhf system and at times it would lock up
> my rlc2 controller until i took it off the same
> power source and used battery power it fixed
> it.. but the trident controller was holding
> the rlc controller in weird mode when it would
> goto ltr channel 3
>
We have a story, which is pretty much the same
animal as my described problem.
Moving the one repeater over to another DC Power
Supply solved the problem. All the original and
spare equipment repeater hardward combinations
now function as expected (normal).
The orignal Triplite 40 Amp DC Supply measures
just what it should. Something related to the
output impedance, filtering (ESR), glitch or
HF noise bypassing, grounding or lack of case
cabinet negative rail grounding, ground loop is
probably the the described problem source.
There are two other controllers running off the
same DC rail, some HF noise or logic glitching
on the dc rails might be an issue.
The output of many DC Supplies is not grounded
to the case/cabinet (floating). The Triplite
negative rail is not grounded to the case/cabinet.
A loop might have been formed from the negative DC
lead wire to the rack mounted equipment, which was
both chassis and frame grounded.
Fix options might include bonding the Triplite
supply negative rail directly to ground or through
a large glitch diode. Possibly the supply filter
capacitors have poor ESR (old and tired) or there
might (probable) also not be adequate triple
bypassing. A temp fix might have been to "tack on"
additional filter capacitors.
We are converting the site over to a Master DC
Rail Supply System, the repeater hardware made
the trip a week or two before the planned move.
I suspect the Triplite DC Supply to have aged
filter caps and marginal noise bypassing. Filter
Cap ESR can be researched on the web or see the
Sencore Test Equipment web site. I'll check the
supply upon full retirement later this month,
although I don't point the finger completely at
the above issues as the problem source.
There might be a magic combination of glitches
on the DC Rail, sourced from one of the other
controllers or a combination thereof. You may
want an exact reason, I just wanted to be done
with the problem and put this gremlin to bed.
The Triplite DC Supply remains operational
with the other repeaters working 100% as
expected. Some magic glitch combination is
formed with this repeater in this rack space,
on the Triplitte Supply at this moment in
time after some years of regular operation.
Go figure...
Thanks for all your feedback. I hope the next
hair-pull problem goes another direction.
cheers,
skipp
www.radiowrench.com/sonic
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