[OZAPRS] 40m gates
Gerard Hill
vk2io at amsat.org
Fri Dec 18 01:08:00 EST 2015
Hi Matthew,
That is the bandplan for ITU Region 3 (our region) and as you say it has
narrowband modes from 7030 to 7040 unlike the WIA bandplan that has CW
within this segment. It would be worth clarifying this with the WIA TAC
(Technical Advisory Committee). I expect they'll say it is for
harmonisation with IARU Region 1
<http://www.iaru-r1.org/index.php/documents/Documents/HF/IARU-Region-1-HF-Bandplan--2014/>
and Region 2
<http://www.iaru-r2.org/documents/explorer/files/Plan%20de%20bandas%20%7C%20Band-plan/R2%20Band%20Plan%202013.pdf>
that have CW up to 7040 then narrowband digital modes from 7040 to 7050
then wideband digital modes (and SSB) from 7050 to 7060.
As for increasing awareness of the frequency change, promotion on this
mailing list, WIA broadcasts as well as the outlets you mention would go
a long way towards saturation coverage. Advising users of the 7040-7050
segment about the change in mode will be a step towards seeing it freed
for digital modes. I know of one daily net that has already moved from
7045 to a frequency in the SSB segment. There are more - it just takes time.
Considering our new bandplan, are there other 40m APRS users around the
world that we could harmonise with?
Cheers,
Gerard - VK2IO
On 16/12/2015 11:29 PM, Matthew Cook wrote:
> 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
> <mailto: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
>
> 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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