[OZAPRS] Higher beacon rate HF versus VHF?

[David and Justine Olsen]

No doubt about it Rob, 30m is where most of the effort should go. Me  
I will play backstop on 40m


On 31 Mar 2009, at 15:14, Rob Heyer wrote:

> Ray,
> Hi, I believe you have made a number of good points in your note.
>
> I don't say much on APRS (OZAPRS) because I have a lot to learn and  
> feel 'we' as amateur's need to hasten slowly on the HF issue; look  
> and learn (good and bad stuff) from those who have made there mark.
>
> We will have a wonderful safety system for those who need it, if we  
> keep our heads.
>
> Me, I'm working towards 30M and think we couldn't have a better  
> band for APRS than 30M.
>
> For what it is worth!
>
> 73's
>
> Rob Heyer
>
> IRLP VK2RMP Node No. 6018 (146.850 MHz)
>   APRS - VK2XIC QTH; VK2XIC-4 Bicycle; VK2XIC-9 Car; VK2XIC-12  
> Portable
>   Member - WIA  & IARS
>               - SES (Shellharbour City)
> Eat Australian lamb a 1,000,000 Dingos can't be wrong !
>
> --- On Tue, 31/3/09, Ray Wells <vk2tv at exemail.com.au> wrote:
>
> From: Ray Wells <vk2tv at exemail.com.au>
> Subject: Re: [OZAPRS] Higher beacon rate HF versus VHF?
> To: "Australian APRS Users" <ozaprs at aprs.net.au>
> Received: Tuesday, 31 March, 2009, 7:30 AM
>
> Hi David,
>
> You need to remember that your geographical isolation in the middle  
> of nowhere doesn't place you any "further" from an HF Igate, as far  
> as RF is concerned, than if you were in the middle of a large city.  
> And it is feasible (but probably unlikely) that propagation is such  
> that an Australian Igate is the only one hearing US traffic on 30m,  
> and they have lots of it. I regularly receive beacons from two US  
> stations (one of them last night and both the night before), and I  
> gated quite a number of packets from a station yachting around the  
> Caribbean a couple of years ago.
>
> Nobody can predict how far their HF signal will propagate.  
> Prediction charts are just that, predictions. A bit like the  
> weather, and we know how that can end up.
>
> For HF, we have to consider ourselves as a part of the global network.
>
> Discuss away, we all may stand to learn something as a result.
>
> Ray vk2tv
>
> David and Justine Olsen wrote:
>> Hi Richard
>>
>> My email answer may have seemed a bit short, that wasn't my  
>> intention.
>>
>> I was just thinking that for HF APRS where the maximum range must  
>> surely be limited compared to voice, that a worldwide standard on  
>> beacon rates that seems like a good idea in heavily populated  
>> areas may not be such a good idea in VK.
>>
>> I was just contributing to the discussion that not only arrives at  
>> such agreements, but also varies them in the same way as the Wide  
>> n.n  change came about.
>>
>>
>> David
>> VK4MDX
>>
>>
>> On 30 Mar 2009, at 20:00, Richard Hoskin wrote:
>>
>>>
>>> Hi Dave,
>>>
>>> I'm not really asking for agreement.
>>>
>>> I was pointing out the recommended mobile HF beacon rate world  
>>> standard that
>>> has been in place for over 15 years, and the reasons why.
>>>
>>> We have a very good VHF APRS Network in Australia that is based  
>>> on standards
>>> and cooperation.
>>>
>>> Cheers
>>> Richard
>>> VK3JFK
>>>
>>>> -----Original Message-----
>>>> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs- 
>>>> bounces at aprs.net.au] On
>>>> Behalf Of David and Justine Olsen
>>>> Sent: Monday, 30 March 2009 8:12 PM
>>>> To: Australian APRS Users
>>>> Subject: Re: [OZAPRS] Higher beacon rate HF versus VHF?
>>>>
>>>> Richard,
>>>>
>>>> I am not sure I agree <snip snip>
>>>>
>>>>> this results in a maximum of 7 stations being able to transmit per
>>>>> minute.
>>>>
>>>>
>>>> You sure? They can transmit all they like. Given the poor Rx  
>>>> success
>>>> rate, they aren't going to cause a whole lot of problems if they
>>>> aren't heard by anyone.
>>>>
>>>>> Lets see, HF APRS increases the coverage area from roughly 200,000
>>>>> Sq Km
>>>>> using 3 hops to potentially 75 Million SQ KM.
>>>>
>>>>
>>>>
>>>> Australia is different to elsewhere most that space has nobody  
>>>> in it.
>>>>
>>>>
>>>>> the maximum number of
>>>>> stations that can be in a single APRS Gate's coverage area is 70
>>>>> stations.
>>>>
>>>> I wonder how many times you have seen 70 HF stations on APRS at  
>>>> once,
>>>> let alone in one iGate's coverage area.
>>>>
>>>>
>>>> David
>>>> VK4MDX
>>>> _______________________________________________
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>>>> Ozaprs at aprs.net.au
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>>>
>>> _______________________________________________
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