[OZAPRS] HF to VHF Confused
David and Justine Olsen
davejust at bigpond.net.au
Fri Mar 27 20:55:45 EST 2009
Fair enough, I was thinking more gates on the best frequency (other
than 30m) gives a better chance of being heard by someone versus
spreading resources across frequencies.
I am hearing quite loud packets now but no decode
David
On 27 Mar 2009, at 19:07, Ray Wells wrote:
> I think it's that we have choices that's important.
>
> David and Justine Olsen wrote:
>> 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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>>>>>
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