[SixClub] 6 meter repeater PL tones

[donroden at hiwaay.net]

Agreed !!

there was a repeater once that had a mix and wouldn't unkey.

The owner put a tone on the output and a decoder on the input to  
REVERSE COR the thing off. weak signals WITHOUT tone could activate  
the repeater, but when the signal went away, and the IM took over, the  
tone killed the PTT. Once the mix was killed, the repeater was quiet.

An inelegant solution for sure.

Don WA4NPL




Quoting "Chris Boone" <Cboone at earthlink.net>:

> BUT using PL doesn’t make the PROBLEM or MIX go away...it covers it  
> up but the rptr range is actually less now...
>
> My personal experience on UHF......440 GE rptr on 23 story  
> building...NO desense, etc with the rptr and duplexer into dummy  
> load...had been on 444.1 but swapped with another rptr that had some  
> problems...so I ended up on 444.8......and SOMEWHERE in the building  
> was a scanner or monitor rcvr listening to the local Sheriff rptr on  
> 460.500---wanna guess what the IF offset was?? 10.7MHz....low side  
> injection (can you see where this is going?) and tada...constant low  
> level signal on 449.80!!! So we added PL but the decoder would not  
> unmute because of the heterodyne between the user on the input and  
> the scanner LO...
> We went carrier SQ and had better range though you still heard the  
> "tone"....finally ended up moving to 444.5 where it is still today
>
> If you cannot run the rptr in carrier mode, don’t expect better in  
> PL mode!!! The problem is just hiding!
>
> Chris
> WB5ITT
> And I run flat audio on all my systems..
>
>> -----Original Message-----
>> From: sixclub-bounces at mailman.qth.net [mailto:sixclub-
>> bounces at mailman.qth.net] On Behalf Of donroden at hiwaay.net
>> Sent: Wednesday, April 21, 2010 4:25 PM
>> To: World Wide Six Meter Club
>> Subject: Re: [SixClub] 6 meter repeater PL tones
>>
>> "Back in the day" ( pre-expensive cavety filters ) a repeater owner
>> could PL the input and not the output. That way, if there was any
>> desense or mixing products, the repeater would not "hang-up", becaued
>> the interference DIDN'T have the correct PL to trip the COR.
>> Running the same tone on the transmitter would be counterproductive to
>> eliminating the "hang-up". Repeaters that passed ALL the audio
>> suffered from the same problem.... the PL passed on through.
>>
>> most used a high-pass audio filter ( above the PL frequencies ) to
>> eliminate the pass-through.
>>
>> Don WA4NPL
> donate.html
>
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