[OZAPRS] HF to VHF Confused

Fri Mar 27 19:22:20 EST 2009

Ray

Once again thanks for your input and experience. Of course all my  
coms have been voice. I have no experience with data. That is one  
reason I am keen to have as many people as possible attemt to access  
my igate on 40m, if it is in fact a worse choice, I will know for  
sure before I set of and then we will have to igates on 20m :-)

David

On 27 Mar 2009, at 17:48, Ray Wells wrote:

> I would seem that our various experiences over the years are quite  
> different and variable.
>
> Having travelled through the region David intends visiting I can  
> only recommend 20m to get signals to populated areas. From  
> experience gathered over a 10 year period on HF with the BBS, there  
> is no question that 30m wins hands down for signal quality and  
> reliability, with 20m a not so close second on some routes. I've  
> been using 40m for the BBS for maybe 8 years now and anything over  
> about 400km is generally unreliable. Those findings are, of course,  
> somewhat variable, except for 30m which, on some routes provided 22  
> hour per day forwarding. There is also a big difference between a  
> short position frame and multiple (short - paclen 64) frames  
> required for bbs traffic.
>
> Give that Mother Nature can sometimes be unkind (we recently  
> experienced many weeks where 40m was totally useless - the O.W.F.  
> was about 3.5Mhz), the more options that are available, the better.
>
> The amateur service does, at least, have the option of alternative  
> bands and that enhances the possibility of establishing contact.
>
> The IPS online prediction service, Grafix, is brilliant for  
> predicting HF paths and optimum working frequency (OWF).
>
> Cheers ... Ray vk2tv
>
>
> David and Justine Olsen wrote:
>> Andrew
>>
>> Thanks for clarifying that.
>>
>> I wonder what range you did your testing over? I travel regularly  
>> in Central Australia SA Deserts and the Kimberley and can talk to  
>> home (Townsville) most days on 40m and 8MHz VKS.
>> For me personally the ability to report my position at beginning  
>> and end of day is more important than during midday, and I think  
>> that would be the case for most people traveling away from VHF  
>> regions. Just how many of us are standard calls I have no idea. I  
>> am doing my advanced call study now, but 5 months of travel will  
>> put a halt to that :-)
>>
>> Anyway it will be fun to see what happens if I run the iGate 24/7  
>> while I am away, and have my vehicle reporting position for 5  
>> months. I think not too many people would have the opportunity to  
>> run a test like that one.
>>
>> I will be in Simpson Desert from May to mid June then Cape York  
>> (20m will be useless Cape York to Townsville except from the very  
>> tip) Then in the Gulf and Kimberley Regions until end Sept
>>
>>
>> David
>> VK4MDX
>>
>>
>> On 27 Mar 2009, at 17:17, vk5ex.andrew at gmail wrote:
>>
>>> Hi David and all,
>>>
>>> In the past there were a few HF gateway stations about that  
>>> were'nt directly connected to the internet. I have in the past  
>>> been in this category myself however It would be nice to know,  
>>> who / if there are any HF gates still running that dont have a  
>>> direct connect to the aprs-is ?    Hence the recommended use of  
>>> GATE,WIDE2-1 for HF mobiles.
>>>
>>> And .. we ( VK5 ) have also done a resaonable amount of testing  
>>> on 40m for possible HF APRS use back a few years ago. Similar  
>>> time frame to what Brian was alluding to in his email. At that  
>>> time we didnt have much success either on 40m, alaways going back  
>>> to 30m, with perhaps 20m as the second choice. I reckon the main  
>>> problems were daytime noise levels at the HF gates, along with  
>>> some funny multipath stuff. Anyway It'll be interesting to see  
>>> how 40m performs for you this time around. Like you say it would  
>>> probably be a good option in the long run.
>>>
>>> Regards .. Andrew .. VK5EX
>>>
>>>
>>> ----- Original Message ----- From: "David and Justine Olsen"  
>>> <davejust at bigpond.net.au>
>>> To: "Australian APRS Users" <ozaprs at aprs.net.au>
>>> Sent: Friday, March 27, 2009 13:45
>>> Subject: [OZAPRS] HF to VHF Confused
>>>
>>>
>>>> I note reference on the Australian aprs site to HF iGates  
>>>> digipeating  to VHF. Not sure why?
>>>>
>>>> My plan for HF at least initially, was to simply receive on 7036  
>>>> MHz  and upload the data to an APRS server, so that HF stations  
>>>> can be  tracked. This will be easy to do as it doesn't require  
>>>> anything other  than my radio, antenna and computer equipped  
>>>> with soundcard and  internet connection. Am I missing something?
>>>>
>>>> David VK4MDX
>>>> _______________________________________________
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>>>> Ozaprs at aprs.net.au
>>>> http://aprs.net.au/mailman/listinfo/ozaprs
>>>
>>> _______________________________________________
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>>
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>
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