[Elecraft] Experiment: how much PL tone deviation is required to > reliably key repeaters? (Wayne Burdick)

[Dale Putnam]

The "normal" or standardized modulation of PL tones is +/- 600 hetz... set and left alone...The "normal" or standardized modulation used by repeaters at a minimum is usually considered to be reliable is 20% or +/- 120 hertz.


Have a great day, 
 
 
--...   ...--
Dale - WC7S in Wy
 
 

> Hi all,
> 
> There seems to be some debate about how much FM deviation is required for PL tones used to activate repeaters. There's a wide range of deviation values in use by transmitters, and various "standard" recommendations. The question is how much is needed for reliable operation in the real world. 
> 
> Our objective is to set the default PL tone deviation in the K3 and KX3 to the lowest level that works in virtually all cases (let's say 98-99%, since there are always outliers). Setting it too high can result in the tone being audible in receivers.
> 
> If you have a K3 or KX3 outfitted with an internal 2-meter module (or an external transverter on any repeater band), you could help us with this experiment: just try reducing the PL DEViation value to the point where you can no longer reliably key up your local repeaters. 
> 
> NOTES:
> 
> 1. If you're doing this with a KX3, please use the current production firmware (rev. 2.18) or later. Earlier releases may not have provided an accurate PL DEV setting.
> 
> 2. To adjust the PL DEViation, locate the FM DEV menu entry, then tap '1' to switch to PL DEV. This applies to both the K3 and KX3.
> 
> Thanks for the help--
> 
> Wayne
> N6KR
> 
> 
> 
> -