[OZAPRS] HF Configuration.

[Des Shephard]

The transceiver I am using for the HF gateway has a "High-Stability
Crystal 
Unit", stability 0.5 ppm
-30C to +60C. Other gateways and "net" stations probably are similar.

Des VK4DMI


----- Original Message ----- 
From: "Andrew Rich" <vk4tec at people.net.au>
To: <vk3jfk at amsat.org>; "VK / ZL APRS Users" <ozaprs at aprs.net.au>
Sent: Saturday, April 14, 2007 10:22 AM
Subject: Re: [OZAPRS] HF Configuration.


> How good is the drift on the primary ?
>
> No point having a master that drifts
>
>
>
> -----------------------------------------
> Andrew Rich
> Amateur radio callsign VK4TEC
> email: vk4tec at people.net.au <mailto:vk4tec at people.net.au>
> Brisbane AUSTRALIA
>
>
>
> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au]On
> Behalf Of Richard Hoskin
> Sent: Saturday, 14 April 2007 10:12 AM
> To: 'VK / ZL APRS Users'
> Subject: Re: [OZAPRS] HF Configuration.
>
>
>
>
> Gday Dick,
>
> The HF Gates (some times also an IGate) transmit at pre-set intervals to
> allow the accurate tuning or 'Netting' of all other HF stations to the
> Primary or Secondary Net Stations.
>
> As the frequency tolerance is tight for HF and radios in mobiles tend to
> drift the beacon rate required to tune and retune the radio needs to be
> relatively high.
>
> The Primary Net station VK3MY-4 transmits once every 5 minutes on HF.
The
> Secondary Net Stations VK4DMI-4 and ZL1GTB also transmit once every 5
> minutes on HF. All other Gates should set their beacon rates to transmit
> once every 20 minutes or more on HF.
>
> If the Gates run VHF or APRS-IS on a second port then you may see them
> beacon their HF posit on the second port more often than the HF port.
> VK8ZAB-4 for examples does not transmit on HF, he sends all posit to 
> APRS-IS
> at the 30 minute rate.
>
> Cheers
> Richard
> VK3JFK
>
>
>
>
>> -----Original Message-----
>> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
>> Behalf Of VK7DIK
>> Sent: Friday, 13 April 2007 1:05 PM
>> To: VK / ZL APRS Users
>> Subject: Re: [OZAPRS] HF Configuration.
>>
>>
>> Hi All,
>>
>>           I think some of you guys missed the point I was trying to
make.
>> My point was the parameters used should be such to ensure maximum
>> possibility of the mobile station being heard by an IGate. For sure
there
>> has to be a limit but if an IGATE can beacon every few minutes I
believe
>> the HF mobile station should be able to do the same else, why have HF
>> IGates ?
>>
>> Cheers, Dick.
>> VK7DIK
>>
>> Please Note.
>> My e-mail address at home is vk7dik at dodo.com.au and work is
>> dick.vanbeek at zinifex.com
>> If your address book do not have these then please change it.
>>
>>
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