Help with first contact

[wb5mmb]

Another problem I have seen is with repeaters that do not strip PL 
tones off the repeated audio. If the tone on the repeated audio is 
different from the tone the repeater transmits you end up with 2 
tones going into the tone squelch on your radio and how tones are 
detected determines if your tone squelch will open or not (filter 
type detectors will work, counting zero crossings in software will not).
      Sandy
     WB5MMB


At 09:20 PM 1/28/2013, you wrote:
>NO!
>
>The tone on the input MAY be related to the tone on the output, but
>not necessarally.
>
>I have run repeaters that use carrier squelch on the input, but
>everyone of them runs a tone on the output.  This is so the users
>don't have to deal with noise opening the squelch on their radios.
>However, because it is an option, they don't have to use it.
>
>I also have a close friend who runs closed UHF repeaters.  He doesn't
>want people to figure out (easily) how to gain access.  He uses cross
>tones.  The tone that opens the repeater is NOT the tone on the
>output.  The NYC police used a similar system, but now they don't even
>pair the repeater inputs and outputs at 5 MHz because of
>interference.  They use odd parings and cross tones.
>
>--chip
>
>On Jan 28, 2013, at 3:47 PM, tacos-request at amrad.org wrote:
>
>>Message: 2
>>Date: Mon, 28 Jan 2013 15:18:11 -0500
>>From: Louis Mamakos <louie at transsys.com>
>>To: Iain McFadyen <ki4hlv at gmail.com>
>>Cc: tacos at amrad.org
>>
>>Just curious, why wouldn't any repeater with PL tone required to
>>open the receiver also just transmit the same PL tone?  It would
>>presumably avoid this particular issue, as well as giving users the
>>option of using a PL tone squelch while using the repeater?  Even if
>>the receiver didn't pass it though, the transmitter could just
>>always insert it into the transmitted audio.
>>
>>louie
>>wa3ymh
>
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