I would get in touch with the station Engineer and ask him or her if they
may adjusted something, added or removed anything within the past time frame
that this interference started. If they say No then you may have something
on your end just went out.
I would start with the Ground to see if the continuity of Resistance is Zero
Ohms. from Chasis, Cabinet, rack, etc.. especially green crud from moisture
will start a resistance path to ground.
a good oscilloscope check will indicate intermittent, as well a VOM check.
Good Hunting !
Mark Holman, CRO
AB8RU
----- Original Message -----
From: "Jeff Thomas" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Tuesday, November 23, 2004 6:25 PM
Subject: Re: [Repeater-Builder] Repeater Interference
>
> Thanks Mike,
>
> The station is 1420 AM.
>
> Nothing else was changed besides the duplexer.
>
> The AM station audio is audible during the entire time the repeater
> transmitter is transmitting, even during the hang time.
>
> It is a much lower level compared to the repeated audio and it is
> perfectly
> clear. I could hear everything Rush Limbaugh was saying.
>
> Thanks for your help.
> Jeff - W2JRT
>
>
> ----- Original Message -----
> From: "Mike WA6ILQ" <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Tuesday, November 23, 2004 1:29 PM
> Subject: Re: [Repeater-Builder] Repeater Interference
>
>
>>
>> At 07:43 AM 11/23/04, you wrote:
>>
>>>I have a 70cm repeater that is located about .75 mile from a commercial
>>>radio station.
>>>
>>>I was using a Cellwave Notch type mobile duplexer and experienced no
>>>problems what so ever. Recently I purchased a new Sinclair Bp/Br Q318GR,
>>>4
>>>cavity duplexer and replaced the Cellwave. This morning I have noticed
>>>that
>>>the nearby radio station is now coming through on the repeaters
>>>transmitted
>>>signal.
>>>
>>>Anyone have an idea what causes this and how to get rid of it?
>>>
>>>Thanks,
>>>Jeff
>>
>> Is the station AM or FM ???
>>
>> What else was changed besides swapping out the duplexer?
>>
>> Is the station audio audible during the received signal only, or is it
>> also there during the carrier delay ?? (the time period that the TX is
>> still up after the RX squelch closes and before the repeater carrier
>> drops).
>>
>> Can you hear it under the ID?
>>
>> How loud is it compared to user audio or ID audio?
>>
>> Mike WA6ILQ
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
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