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[aprssig] APRS Local Info Initiative

Bob Bruninga bruninga at usna.edu
Sat Feb 18 17:37:53 UTC 2012


> There are other bandplans and differing frequency 
> allocations world wide, so one (assumed) size 
> does not fit all.
> Just like Andre PE1RDW detailed.

I assumed everyone understood that.  If you do not have the 440 to 450 band, then the comment does not apply.

And Kenwood makes different model radios for each area.  The USA has 440 to 449.999 for repeaters etc.  So it only makes sense that if the freq is above 445 MHz, then it must be a -5 MHz offset or it would be out of band.  And if the freq is below 445 MHz then the 5 MHz offset is positive or it would interfer with the satellite and ATV band (in the USA).

If your country's Kenwoods are the USA model D710A and  you also have the 440 to 450 band, and if + or - 5 MHz is not your standard offset, then let me know.

Thanks
Bob, Wb4APR


>73.
>
>Dave G0WBX.
>
>
>On 17 Feb 2012 at 8:41, Bob Bruninga wrote:
>
>> The Kenwoods do not autoset the UHF offset.  I never understood why.
>> Makes no sense, because if the frequency is above 445, then it has to
>> be MINUS and if it is below 445, then it has to be +.  And every ham
>> knows that, so no need to have to transmit it...
>>
>> SO I guess if you want the radio to QSY, then you should include it.
>>
>> Bob, WB4APR
>>
>>
>> I was giving someone a hand with the IRLP APRS status script on
>> their node and commented that the frequency wasn't entered
>> correctly for users of the D72/D710/FTM350 (does the VX-8GR also
>> do this?) to use the tune/QSY buttons. While trying to make
>> suggestions, I noticed that the node is on a UHF frequency with a
>> minus offset. Do these radios automatically handle the offset or
>> should the offset direction be included in the object?
>>
>> The following pages are related, but I couldn't find a mention of
>> offset / shift direction.
>>
>> http://aprs.org/localinfo.html
>> http://aprs.org/hamfest.html
>> http://aprs.org/info/netsked.txt
>>
>> Shift is mentioned on the following page, but not how it is
>> implemented. Going by the original IRLP APRS status
>> script, I believe it should be after the tone. Is this correct?
>> Should it be blank or an S for simplex?
>>
>> http://aprs.org/aprstt.html
>>
>> Is it assumed that the radio will automatically use the correct
>> offset? If so, will it do this when there's an oddball frequency
>> e.g. on 70cm with a minus offset? Or is the operation dependant
>> on the object showing the actual shift direction?
>>
>> 73 es cul - Keith VE7GDH
>> --
>> "I may be lost, but I know exactly where I am!"
>>
>>
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>>
>
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>
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