<p dir="ltr">Oh ok my bad! I was unaware of the alteration of the 40m band plan! I had just recently downloaded a copy but didn't look at it closely with regards to the digital allocated section. </p>
<p dir="ltr">So I now agree that a frequency change will be required going forward. So the question is to our ZL neighbours, is 40m APRS still active? If so then is there a particular frequency that is historically been used for voice schedule that should be avoided? I've got some vague recollection that 7.045 was once used, but I don't recall exactly what for! </p>
<p dir="ltr">Maybe a new thread should be started to get discussion started... </p>
<br><div class="gmail_quote"><div dir="ltr">On Wed, 16 Dec 2015, 02:50 Gerard Hill <<a href="mailto:vk2io@amsat.org">vk2io@amsat.org</a>> wrote:<br></div><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 href="http://aprs.net.au/hf/hf-aprs-frequencies" target="_blank">http://aprs.net.au/hf/hf-aprs-frequencies</a></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 href="http://iaru-r3.org/?dl_id=1" target="_blank">http://iaru-r3.org/?dl_id=1</a></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</div></div><div bgcolor="#FFFFFF" text="#000000"><div><br>
<br>
On 14/12/2015 9:19 PM, Scott Evans wrote:<br>
</div></div><div bgcolor="#FFFFFF" text="#000000">
<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>
</div>
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