[OZAPRS] 40m gates

[Gerard Hill]

Interesting history on the origins of 7036 LSB for APRS. I tend to quote 
dial frequencies for the "standard" 1600/1800 Hz tones. The dial 
frequencies for the six other tone pairs in common use are available 
here: http://aprs.net.au/hf/hf-aprs-frequencies

When it comes to looking for a spare slot in the band its the centre 
frequency that is of interest. This is 1700 Hz less than the dial 
frequency. Looking at the group archives, there was a lot of discussion 
in Oct 2009 about moving away from 7036 to avoid QRM. We never did move 
:) Now we'll have to.

The current ZL bandplan 
<http://www.nzart.org.nz/info/technical/hf-band-usage/> has not changed 
since 2013. The segments in 40m are the same as the old VK bandplan. Its 
probably due for a review to fall in line with the latest IARU Region 3 
bandplan: http://iaru-r3.org/?dl_id=1
In VK we should follow the VK bandplan (as released in Sep 2015). Its 
annoying to have to change frequency, but its going to happen so we 
might as well get established as soon as we can when there is more 
choice of frequencies. Liz VK2XSE, I'm in the same boat and will have to 
reprogram radios - we all will. Now to work out what the frequency 
should be...

Cheers,
Gerard - VK2IO

On 14/12/2015 9:19 PM, Scott Evans wrote:
> The History of HF APRS on 40m stems from our friends in ZL. That was 
> the frequency that suited best for their local coverage and so I just 
> setup there. Now I'm not up to speed with the ZL band plan (or if 
> there is one) but I do recall a problem with the use of digital modes 
> higher up the band. Personally I'd prefer to stay on the frequency I'm 
> on purely for the fact that it's a known frequency for use in VK/ZL
>
> back in the archives of this mailing list you will find a bit of 
> chatter around 2007/2008 for reestablishing either a 40m or 20m 
> network as an alternate for VK standard license class as they don't 
> have permission to operate on WARC bands. After quite a bit of testing 
> between the two bands it was settled that 40m was the better of the 
> two at that time.
>
> just one thing to remember, depending on the tone pair of your HF 
> TNC/Tracker most use 1600/1800Hz but some older gear (like the Pakratt 
> PK-232) uses 2110/2310Hz this affects your dial frequency. The 
> reference to 7.036 LSB is for 1600/1800Hz tones so your dial frequency 
> is 7.036+/- and if you are using 2110/2310Hz like me, the dial 
> frequency is 7.036510 LSB (2110/2310Hz)
>
> Now I'm not going to confuse this any further by quoting center 
> frequencies like is done with pactor! :D

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