[OZAPRS] Further on 40m BBSs and APRS

[Chris Hill]

Hi All,

I note that the US 40m APRS frequency is the 7.0832MHz & 7.0834MHz pair.
(7.085MHz suppressed carrier for LSB, using 1600Hz & 1800Hz tones).
<http://www.aprs.net/vm/DOS/HF.HTM>

However, from the VK Bandplan, only 7.030 to 7.040MHz is allocated for
Digital Modes ("'Digital Modes' includes all modes such as RTTY, packet
and
Amtor, using FSK or PSK and with bandwidths up to 1.12 kHz. The SSB
segment
can also be used for image transmission modes such as SSTV or Fax, using
bandwidths up to 4 kHz)".
<http://www.wia.org.au/bandplans/Australian_Amateur_Band_Plans.pdf>

So, it doesn't look good for co-ordinating with the US on this one.

However, perhaps we could use the same 40m APRS frequency as Europe seems
to
be using;  from
<http://www.franceaprs.net/modules.php?name=Recommandations&func=qrg>,
they
use a frequency pair of 7.0332MHz & 7.0334MHz (7.035MHz suppressed carrier
for LSB, using 1600Hz & 1800Hz tones).


This is pretty close to the suggested move to 7.036MHz;  can anyone
comment
on whether 7.035MHz (-ish, suppressed carrier) is  already in use?  If
not,
then why don't we make 7.0332MHz & 7.0334MHz the VK (and ZL?) standard for
APRS operation on 40m?



73 Chris vk6kch




-----Original Message-----
From: ozaprs-bounces at marconi.ics.mq.edu.au
[mailto:ozaprs-bounces at marconi.ics.mq.edu.au]On Behalf Of Brian Beamish
Sent: Thursday, 25 December 2003 10:00 PM
To: OZAPRS
Subject: [OZAPRS] Further on 40m BBSs and APRS


Hi Folks
Hope you all had a great Christmas Day we sure did.

Yes it is the exact same frequency as the BBS stations have been on for
quite some time now and the same frequency pair just get on and listen.

Yes I believe it is most unfair and uncooperative of us to be beaconing
when
they are often trying to either forward between BBSs or being accessed by
users. For one who has run a HF BBS I can appreciate the delays and
problems
that would be created by us operating a HF APRS network right on the same
frequency. I feel that it would for want of a word be most unsportsmanlike
of us to do so and I for one would not consider operating there for that
very reason and I am sure that there are others who feel likewise.

Also during the time that forwarding between BBSs or the time users access
these BBSs which could be from a few minutes to maybe 30 minutes at a
time,
remember it is not 1200 baud packet they are forwarding at but 300 baud,
we
would not be able to get beacons through anyway.

Why not move to 7.036 LSB or some other less busy and freer frequency we
have nothing to loose but plenty to gain.

Have a great New Year

B C N U
Brian VK4BBS




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