[OZAPRS] 40m gates

Matthew Cook vk5zm at bistre.net
Wed Dec 16 23:29:09 EST 2015


In reading all three docs it appears that the latest WIA 40m band plan has
followed the ITU Narrow Band (NB) DX recommendation starting at 7.040,
which still has NB modes listed down to 7.030.  I wonder why, this seems
half baked at first glance?

The 40m APRS frequency has been 7.036kHz (group C tones) for as long as I
can remember.

Perhaps some clarification from the WIA can be sought through the TAC's as
to when/why was this changed.  I know my VK5 TAC well and am happy to
discuss.   I'm sure there will be further changes to the ITU band plans as
of the recent meeting of the minds.  For the time being it seems sensible
to sit tight, ask a few questions and see what happens.   The band plans
are fluid as was recently demonstrated with the 2m and 70cm bandplans
having been straightened out and previous decisions reversed.

If the frequency needs to change, then this will need to include a national
awareness campaign, so information in AR, vklogger, faceborg etc in an
attempt to get the new frequency out there.  Otherwise those in the know
will move, but those that haven't heard will simply think it's closed
down... which would be sad.  There are a number of rag chewers in the
7.040-7.050 region using SSB already, so moving and camping in there will
lead to a few cross words.

Just my 0.022c worth inc GST and since I've got a vested interest in
helping said Ham in the Riverland get Larry's gate going again on 40m and I
hate reprogramming 8525/8528 Codans with a passion !

73

Matthew
VK5ZM

On 16 December 2015 at 02:20, Gerard Hill <vk2io at amsat.org> wrote:

> 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>
> 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>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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>
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