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[aprssig] Voice Alert in 'down under' ??

Steve Noskowicz noskosteve at yahoo.com
Fri Jun 4 00:25:39 UTC 2010



Is this valid for both the 'larger' down under and the 'smaller' down under?

I have this:
	Australia 145.175 MHz Voice Alert = 91.5 Hz.
	...
	New Zealand: 144.575 MHz


[note I avoided big vs. little (;-)]
--
 73, Steve, K9DCI   USN (Vet) MOT (Ret) Ham (Yet)

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--- On Thu, 6/3/10, Geoff <geoff-lists at gatwards.org> wrote:

> From: Geoff <geoff-lists at gatwards.org>
> Subject: Re: [aprssig] Voice Alert in Europe (T136)
> To: bruninga at usna.edu, "'TAPR APRS Mailing List'" <aprssig at tapr.org>
> Date: Thursday, June 3, 2010, 7:04 PM
> Bob,  
> 
> If you are updating pages, down under we use 91.5Hz (T91)
> for VoiceAlert
> (http://www.aprs.net.au/vhf/voice-alert)
> 
> Geoff  VK2XJG
> 
> 
> -----Original Message-----
> From: aprssig-bounces at tapr.org
> [mailto:aprssig-bounces at tapr.org]
> On Behalf
> Of Robert Bruninga
> Sent: Thursday, 3 June 2010 11:35 PM
> To: 'TAPR APRS Mailing List'
> Cc: aprs at yahoogroups.com
> Subject: [aprssig] Voice Alert in Europe (T136)
> 
> Seeing several references to:
> 
> >> Europe, Finland, Ireland: 144.800 MHz Voice Alert
> = 136.5 Hz.
> >> While we've adopted 136.5 here in Ireland...
> 
> Yes, 100 Hz was fine for the USA with a 60 Hz grid and 60
> Hz TV
> scan rate, but in some countries in Europe, harmonics of 50
> Hz
> power grid and mrgawatts of 50 Hz PAL TV RF would give
> false
> squelch openings on 100 Hz.
> 
> So for Europe, Voice Alert is 136.5 Hz CTCSS.
> We need to make sure that all documents reflect this.
> I just went through and corrected my web page
> http://aprs.org/VoiceAlert3.html
> 
> And I invite everyone to update theirs as well.  It
> will take me
> time to correct all of my other documents, but I
> will.  If
> anyone disagrees that T136 is NOT the standard European
> Voice
> Alert, lets battle it out now or forever hold your peace.
> 
> Further, Notice that in APRS we refer to tones by their
> whole-number values and ignore the decimal point.  All
> tones
> these days are generated by special chips and so we only
> use
> their frequency as a reference, not as an exact need to
> specify
> the exact frquency.  No one gives a hoot whether it is
> 136.5 or
> just T136.  They dial in whatever their radio has in
> that slot.
> 
> That is why APRS has standardized on the 4 byte format of
> "Tnnn"
> for specifying PL or CTCSS tones instead of CTCSS 136.5
> which
> takes almost 3 times as much bandwidth!
> 
> Bob, Wb4APR
> 
> 
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