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<DIV><FONT face=Arial size=2>Hi Stuart,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ive played about a fair bit with various antenna
combinations on 30m APRS mobile. I use a modified 5ft CB whip on 30m when
driving around town. ( I can leave it on the bull bar of the landcruiser when
parking under the carport ! ) .. Basically its a trial and error thing. Start
with a CB whip 5ft or whatever length suits .. Get a 20 or 25mm piece of
PVC pipe say about 100mm long. About half way along the CB whip cut into
the plastic coating and remove about 100mm , then cut away about the same amount
of antenna braid leave an inch or so of braid to use as the solder connection
point for each end of the loading coil. .. Slide the tube over the whip and
secure in place with silastic. Wind between 30 - 40 turns of wire around
the pcv tube and solder ends to braid. You will need to play around with the
number of turns and the spacing between the turns etc. By a bit of extra
fiddling Ive managed to get mine to work on 30m and 10m at the same time, with
less than 1.3 to 1 swr on both bands. Because I made mine adhoc so to
speak, I never really measured anything while I was making it, but I could send
you a photo of it if you like as a starting point. It does work suprisingly well
though. Always seem to get into a HF gate without any problems. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I also use an old modified multi tapped Flying
Doctor terlin type antenna, for when Im out in the sticks .. Its a bit longer ..
probably about 6ft or so. ( and doesnt fit under the carport ! ) I had an old
one here that happened to have a 9660 tap. I chopped ( hacksawed ) about an
inch off the top and now its perfectly resonant on 10.146 .. swr 1.1 to 1 ..
This makes for a very robust antenna . Mine has survived some very rough trips
.. banging through trees etc .. and still works extremely well on 30m APRS
. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Another antenna that works excedingly well is to
use a normal 5 band amateur band terlin type tapped antenna. Ive had one of
these antennas for many years, In fact I think it was my first mobile antenna
covering 80-40-20-15-10. The trick with these antennas is to replace the
~100mm tuning stub on top of the whip with a stainless whip. roughly 1 to
1.5m long, scrounged from from the top section of an old CB whip. Then
while using the 20m tapping on the terlin, trim the ( extended stub ) whip
and surprisingly enough you will be able to obtain perfect
resonance on 30m. This configuration works very very
well, probably the best 30m antenna configuration for mobile use.
Trick is to find the ~1m stainless whip to go on the top, with the same
diameter as the original tuning stub, where it slides into the retaining nut.
The main advantage is that you can replace the original tuning stub and still
use the antenna on its original bands as well. Bascially making it a 6 band
antenna. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you want any more info , let me know
..</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards .. Andrew .. VK5EX</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=scameron@airspringssa.com.au
href="mailto:scameron@airspringssa.com.au">Stuart Cameron</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=ozaprs@aprs.net.au
href="mailto:ozaprs@aprs.net.au">ozaprs@aprs.net.au</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, April 08, 2010 2:09
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [OZAPRS] 30m mobile
antenna</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Hello all, I would
like to find out if there is any recommended HF 30m mobile antenna as I am
currently using a Codan 7350 which I would like to use for general
HF.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Regards,
<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Stuart
Vk5ade<o:p></o:p></SPAN></P></DIV>
<P>
<HR>
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