Help with first contact

[Chip Fetrow]

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