Order Tray | Contact Us | Home | SIG Lists

[aprssig] APRS Voice Alert

Dave Baxter dave at emv.co.uk
Sat Sep 10 21:04:49 UTC 2005

"50Hz hum" won't trigger a 100Hz CTCSS system.  Significant PSU ripple (100Hz) may.
Sorry, but had to get that in :)
Dave B. G0WBX.


From: aprssig-bounces at lists.tapr.org on behalf of Robert Bruninga
Sent: Sat 10/09/2005 21:29
To: agara at kantauri.com; aprssig at lists.tapr.org
Subject: Re: [aprssig] APRS Voice Alert


Using 100 HZ tone in europe, do you hear many
squelch mistakes due to 50 Hz hum on some systems?


>>> agara at kantauri.com 09/10/05 3:28 PM >>>
I'm Asier, EB2FGI from Spain.
Usually, when I'm in mobile I use Voice Alert  (I think I'm the unique
ham in Europe using Alert Voice because never I contacted  an other ham
with this system, but I continue trying ...) and I use 100.0 tone.

Asier, EB2FGI

Robert Bruninga wrote:

>One problem with Voice Alert in Europe is
>that I'm not sure what tone they use.
>We use 100 Hz here in the USA, but since
>many of the AC Power Grid in Europe is
>at 50 Hz, this make PL 100 practically useless
>in Europe.  I have seen references to maybe
>136.5 Hz, but then I have also made the mistake
>of writing 123 Hz sometimes.  And of course,
>unless everyone uses the same tone on the
>same continent, then it really doesn't work
>for its intended purpose.
>So, if anyone on this list uses APRS Voice
>Alert in Europe, tell us what tone they use.
>aprssig mailing list
>aprssig at lists.tapr.org

aprssig mailing list
aprssig at lists.tapr.org

aprssig mailing list
aprssig at lists.tapr.org

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/ms-tnef
Size: 5131 bytes
Desc: not available
Url : http://www.tapr.org/pipermail/aprssig/attachments/20050910/b356aa8c/attachment.bin 

More information about the aprssig mailing list