[Elecraft] Re. Experiment: how much PL tone deviation is required to reliably key repeaters?

[Jim Brown]

On Mon,9/8/2014 9:44 AM, Phil Kane wrote:
> Interesting that the UK requires transmitted tone as well as received
> tone.  Although I support this when I can, it has not been all that
> common on US repeaters.

It's pretty much standard where I have lived -- nearly all repeaters in 
the Chicago area transmit PL, as well as here in Northern California 
where I live now. Two major advantages. First, if propagation allows 
your receiver to hear a distant repeater, activating receive PL in your 
rig prevents it from bothering you. Second, receive PL allows your RX to 
be muted when your PL is not present, so your RX doesn't unsquelch when 
you drive through an area of loud noise.

73, Jim K9YC