Re: End of transmission hiss


"fred burgess" <burgessfred33@xxxxxxxxxxx> wrote in message
news:c9c3650b-5c22-4e87-9e4f-55090ecd7586@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Nov 29, 12:05 pm, "mikeFNB" <mike...@xxxxxxxxxxxx> wrote:
yep most prob
though could just be selcalor dtmf id tones?

mike

"fred burgess" <burgessfre...@xxxxxxxxxxx> wrote in message

news:0a3d4630-fe20-401e-b489-5fae3cca473c@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



On Nov 28, 9:49 pm, Bill <kc7...@xxxxxxxxxxx> wrote:
What does it mean when I hear music like jingle (tone) lasting about a
second at the end of transmission? Does it mean it is trunk
communication? Any sites I can look up to learn more?

Thanks in advance.

-Bill

It may very well be a trunk. When the City Services here in Calgary
AB Canada, used the GE/Ericcson trunk, there was a jingle right after
each transmission, then the conversation hopped to the next
frequency. It was totally annoying, and hard to scan. Curious to
know what frequencies you are monitoring. Here in Calgary, we have
now, trunks in 400, 800, and 900 mhz bands.
Fred Burgess- Hide quoted text -

- Show quoted text -

Pardon this dumb question, but was is " selcalor" ? Thanks in advance.
Fred Burgess

Hi Fred...

I'm guessing the OP intended to type selcal. If so, that stands for
Selective Calling, a scheme where two audio tones sent before a conversation
starts "unlock" the receiver's squelch so the conversation can be heard.
Other radios on the frequency which receive those tones (the SelCal "code")
don't unlock and the conversation is unheard. I've heard SelCal used when
aircraft control stations are calling trans-Pacific commercial aircraft.
http://en.wikipedia.org/wiki/Selective_calling provides a pretty good
explanation.

Al


.