[OZAPRS] HF Bands.

[Robert Thirkettle]

Hi All

        I have a major problem with getting my Tinytrak to work on 10 MHz
has any body had similar problems. I am sure the problem is RF getting
into the Tinytrak and corrupting the settings. I have my Tinytrak mounted
in a metal die cast box RF bypass capacitors on all inputs and outputs
plus clamp on ferrites around all the leads. My setup is a IC 706 and AH4
ATU plus whip It all works fine on all bands but 10 MHz.



Noel do you think we can get ZL wide coverage on 30M I don’t think we can
because of the short distances in ZL and the longer skip distance of 30M
compared to 40M this problem will get worse as this sun spot cycle
continues to wards it’ minimum over the next few years even 40M will
struggle as we get to the bottom of the sun spot cycle.



As you can see from the plot below 30M is around 900Km skip distance ZL is
only approximately 1500Km long if we had the 30m Gateway at each end it
may work but I think there will be holes in coverage at the top of south
island and bottom of the north island.



These topics should give us plenty to talk about next weekend.







Christchurch Local Area Mobile Predictions



Regards Rob Thirkettle  ZL3RX

Dept  Physics & Astronomy

University of Canterbury

Private Bag 4800,

Christchurch 8020,

New Zealand

Tel: +64 3 364 2510

Fax: +64 3 364 2469

mailto:rob.thirkettle at canterbury.ac.nz





-----Original Message-----
From: Noel Rowe [mailto:noel-r at clear.net.nz]
Sent: Monday, 31 May 2004 10:11 a.m.
To: ozaprs at marconi.ics.mq.edu.au
Subject: [OZAPRS] HF Bands.



A couple of comments, if I may:



Terry said:



>Incidently, I left my tnc on a couple a nights ago.  The  MH list
>showed three stations from France.   I'm revising my earlier
>observations :-)



And I agree that reviewing each morning (I use a separate terminal screen
for the HF port's traffic) what has been heard overnight is one of the
joys of HF APRS - the thrill of the chase, as it were.



I was a bit disappointed when I was told not to post here the new "DX"
calls decoded, thinking after that, I must be the only one interested in
what was being heard outside of  VK/ZL.



Some thoughts on 40 metres:



Rather than split the HF traffic in two - 30m and 40m - are we not better
to stick to one band (30m, as the 40m frequency is not an internationally
common one) and concentrate on the geographical spread of the receiving
stations.  The beacon is (almost) always going to come down somewhere!  If
there are enough "somewheres" that listen and gate to the internet, then
surely that is better than splitting the receiving points into those on
30, and those on 40?  It whould be a big ask if it was going to be
suggested the gating stations listen on both 30 and 40 for 24/7, and with
different time zones a change time isnt an option.



Our i-gates, at least in my area, are usually set so that any ZL call
"heard" through the internet is then outputted to VHF.  So it is
transparent where the beacon, say via HF, was received and decoded.  Could
be anywhere in the world.  I am working on getting my car set up for HF.
If  I am HF mobile, and some of my beacons are only heard and then gated
in VK, but are then in ZL put out onto local VHF, it is surely "mission
accomplished"!  And can we help to make that work in reverse?



Noel, ZL3GR.

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