<div dir="ltr">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?<div><br></div><div>The 40m APRS frequency has been 7.036kHz (group C tones) for as long as I can remember.</div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>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 !</div><div><br></div><div>73</div><div><br></div><div>Matthew</div><div>VK5ZM</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 16 December 2015 at 02:20, Gerard Hill <span dir="ltr"><<a href="mailto:vk2io@amsat.org" target="_blank">vk2io@amsat.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>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: <a href="http://aprs.net.au/hf/hf-aprs-frequencies" target="_blank"></a><a href="http://aprs.net.au/hf/hf-aprs-frequencies" target="_blank">http://aprs.net.au/hf/hf-aprs-frequencies</a><br>
<br>
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.<br>
<br>
The current <a href="http://www.nzart.org.nz/info/technical/hf-band-usage/" target="_blank">ZL
bandplan</a> 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: <a href="http://iaru-r3.org/?dl_id=1" target="_blank"></a><a href="http://iaru-r3.org/?dl_id=1" target="_blank">http://iaru-r3.org/?dl_id=1</a><br>
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...<br>
<br>
Cheers,<br>
Gerard - VK2IO<span class=""><br>
<br>
On 14/12/2015 9:19 PM, Scott Evans wrote:<br>
</span></div><span class="">
<blockquote type="cite">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
<br>
<br>
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.
<br>
<br>
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)
<br>
<br>
Now I'm not going to confuse this any further by quoting center
frequencies like is done with pactor! :D
<br>
</blockquote>
<br>
</span></div>
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