Mike,
What frequency are you guys on? How high is your antenna? How long has
this problem been going on? How often does it happen? What's the call
of your repeater?
There might be an explanation other than intermod. There is one VHF
repeater in metro Atlanta (West) right now that frequently goes spurious
and, while on the actual operating frequency of that repeater during the
failure you can't hear the users (well, maybe very weak and with
sizzling), you can hear that repeater signal with audio sweeping across
other frequencies (other repeater inputs).
73, Tony W4ZT (Union City)
Mike - WM4B wrote:
>Dick,
>
>Thanks for the info... that helps steer me in the right direction.
>We've got a CAT-1000 controller and I'm still trying to get smart
>about it. It seems like it does everything but butter your toast in
>the morning, and it might even do that if I can figure out the right
>command! I wish we could just solve the intermod problem, but it's
>so intermittant we can't chase it down, so I guess the bandaide
>approach will have to do!
>
>-- de WM4B
>Mike
>Kathleen, GA
>
>--- In Repeater-Builder@yahoogroups.com, "Rich Misener" <[EMAIL PROTECTED]>
>wrote:
>
>
>>Mike,
>>
>>I had this problem with the 146.800 repeater, here in Northeast
>>Oregon, when Fox fired up Ch. 11 (318,000 Watts ERP)about 200 feet
>>from our tower. The club refused to let me put it in total PL, due
>>to the number of members that did not have tone capability, so I
>>compromised and put it in both. I was fortunate to be using the
>>venerable SCOM 5K controller (keeps going, and going, and going).
>>After installing an old Comspec TS-32P that I had in the parts
>>
>>
>pile,
>
>
>>I set the 5K to respond to either "COR or PL" and tightening the
>>squelch to eleminate the burbs and chirps of the intermod. When the squelch
>>is broken the controller goes into repeat. This works in most cases, but
>>allows for mobile drop-out and severe flutter. When a PL tone is detected,
>>the controller goes to repeat, regardless of the squelch setting. This will
>>only work if you install the decoder ahead of the squelch. In my case
>>VOL/SQL HI in a MASTR II. Most newer controllers have the ability to key the
>>transmitter with "COR only", "PL only", "COR and PL", or "COR or PL". If
>>your controller does not have these features, you can build a circuit with a
>>few cheap common parts to do the job. Let us know if you need more help.
>>
>>
>>Dick---N7ZH
>>Technical Director
>>Spout Springs Repeater Association
>>
>>
>>--- In Repeater-Builder@yahoogroups.com, "Mike - WM4B"
>><[EMAIL PROTECTED]> wrote:
>>
>>
>>>Greetings all,
>>>
>>>I've just been brougt on board to assist our local repeater guru and we've
>>>been working on trying to solve an intermod problem we have. Thus far, we've
>>>had little luck finding the source, and one solution we discussed was to add
>>>PL to the machine. Unfortunately, (or
>>>fortunately) the club really doesn't want to PL the machine. It's one of
>>>the few 'toneless' machines in this area, and we're located right off of
>>>I-75, where we have the potential to get a lot of hams passing through.
>>>
>>>I've heard from several folks that it's possible to set up dual
>>>squelch levels... one for signals with PL and one for those without. We know
>>>that by setting the squelch tight, we don't get the intermod problem (at
>>>least not to any significant extent), so if would could set the squelch
>>>tight, allowing ALL signals to access the machine, and then bypass that
>>>setting with a looser squelch for those that have PL, we'd be in pretty good
>>>shape.
>>>
>>>Can one of you guru's point me in the right direction?
>>>
>>>Thanks,
>>>
>>>Mike
>>>WM4B
>>>Kathleen, GA
>>>
>>>
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