<div dir="ltr">Victoria is complicated, so complicated in fact they have a book you download...<div><br></div><div><a href="https://www.vicroads.vic.gov.au/~/media/files/documents/business-and-industry/heavyvehiclesheightclearanceonroadsnov2009.ashx?la=en">https://www.vicroads.vic.gov.au/~/media/files/documents/business-and-industry/heavyvehiclesheightclearanceonroadsnov2009.ashx?la=en</a><br></div><div><br></div><div>73</div><div><br></div><div>Matthew</div><div>VK5ZM</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 8 December 2017 at 16:56, Glen English VK1XX <span dir="ltr"><<a href="mailto:glenlist@pacificmedia.com.au" target="_blank">glenlist@pacificmedia.com.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">what are the recommendations and user practical limits for Melbourne ? (trams)<br>
<br>
Canberra here you'll get into trouble ~ 4m<br>
<br>
I had the loop on my vehicle when I was driving in Melbourne a fair bit....<br>
<br>
I once hit a tram line with my car roof antenna heatshrink insulated helical at Racecourse Road, Kensington... it made a huge pop in the receiver but otherwise no damage...<span class=""><br>
<br>
<br>
<br>
<br>
On 8/12/2017 3:07 PM, Matthew Cook wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
This is also worth considering when looking at larger HF whips.<br>
<br>
<a href="http://www.rms.nsw.gov.au/business-industry/heavy-vehicles/road-access/restricted-access-vehicles/4-6m-high.html" rel="noreferrer" target="_blank">http://www.rms.nsw.gov.au/busi<wbr>ness-industry/heavy-vehicles/<wbr>road-access/restricted-access-<wbr>vehicles/4-6m-high.html</a><br>
<br>
Each state has their own variations to the above, nationally un-restricted is 4.3m.<br>
<br>
73<br>
<br>
Matthew<br>
VK5ZM<br>
<br></span><span class="">
On 8 December 2017 at 14:03, Graeme <<a href="mailto:graeme@abrona.com.au" target="_blank">graeme@abrona.com.au</a> <mailto:<a href="mailto:graeme@abrona.com.au" target="_blank">graeme@abrona.com.au</a>>> wrote:<br>
<br>
Thanks Glen.<br>
<br>
Obviously my decision against buying a 2.2m centre loaded 40m whip<br>
because it would bend in the wind to its disadvantage in favour of<br>
a base loaded 1.4m whip wasn't a good one for multiple reasons.<br>
<br>
Graeme 2HFG<br>
<br>
-----Original Message----- From: Glen English VK1XX<br>
Sent: Friday, December 8, 2017 10:19 AM<br></span>
To: <a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a> <mailto:<a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a>><div><div class="h5"><br>
Subject: Re: [OZAPRS] On possibilities with short HF whips<br>
<br>
<br>
Ran some NR predictions for 10 MHz for Brisbane Sydney, and 7 and 3.5<br>
<br>
and also some more details calcs on the Diamond 1.4m logn base<br>
loaded whip<br>
<br>
turns out to be ~ 3% efficiency.<br>
<br>
for the -15dBi TX terminal (1.4m base loaded whip with suboptimal<br>
loading Q)<br>
<br>
yep, in daytime, single hop 750-1200km , 100W into the antenna,<br>
expect<br>
around 15dB SNR for the 300 baud modem given a good receiver<br>
antenna and<br>
setup...with a modem like DireWolf that can cope with frequency<br>
variations. Be sure you know your radio frequency offset before<br>
you start.<br>
<br>
with same length whip on 7 MHz, expect about 300-700km in<br>
daylight, but<br>
not much use outside that time and distance.<br>
<br>
All of this means is for 300 baud FSK packet mode and 100W, the<br>
mode is<br>
unsuitable for low efficiency mobile antennas like base loaded short<br>
whips. (3% or less efficiency at 10 MHz, 2% at 7 MHz etc)<br>
<br>
All this points to: (in my opinion) needing a >=2.2m long whip<br>
instead<br>
of a 1.4m long whip.<br>
and an antenna with a non base loaded structure (for 300 baud packet)<br>
<br>
Get your antenna efficiency up to 10% at 7 MHz and then now you<br>
have an<br>
idea setup 24 hours, single freq .... 10 MHz almost good enough except<br>
for the wee hours 2am-sunrise when you will be asleep anyway.<br>
<br>
So the lesson here, 300 baud packet needs decent antenna efficiencies<br>
mobile.<br>
hence the need for a mode that does about 6dB better<br>
<br>
sure we can do alot better than 6dB, but 6dB better mode is what is<br>
required to work on the 1.4m base loaded whips.<br>
<br>
Otherwise for 300 baud FSk packet, it needs to be teamed up with<br>
antenna<br>
efficiency >= 8%, implying something with a feedpoint of around 2<br>
ohms<br>
Rr and not too lossy loading and matching... a whip of 2 meters<br>
tall at<br>
10 MHz with continuous or 1/3 loaded structure. Base loaded structures<br>
are the worst !<br>
<br>
The longer 1.8m long CB helical whips are a bit hard to find these<br>
days.<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
g<br>
<br>
<br>
On 7/12/2017 6:36 PM, Glen English VK1XX wrote:<br>
<br>
ok<br>
<br>
<br>
On 7/12/2017 6:24 PM, <a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.net</a><br></div></div><span class="">
<mailto:<a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.n<wbr>et</a>> wrote:<br>
<br>
You are not telling me anything new<br>
<br>
-----Original Message-----<br>
From: OZAPRS [mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.ne<wbr>t.au</a><br>
<mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.ne<wbr>t.au</a>>] On Behalf Of Glen<br>
English VK1XX<br>
Sent: Thursday, 7 December 2017 5:10 PM<br></span><span class="">
To: <a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a> <mailto:<a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a>><br>
Subject: Re: [OZAPRS] Hf gates CD<br>
<br>
base station 700-1500km away will hear you, but you wont<br>
hear a station 50km away.<br>
<br>
<br>
On 7/12/2017 5:57 PM, <a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.net</a><br></span><span class="">
<mailto:<a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.n<wbr>et</a>> wrote:<br>
<br>
Go for a walk<br>
<br>
-----Original Message-----<br>
From: OZAPRS [mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.ne<wbr>t.au</a><br>
<mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.ne<wbr>t.au</a>>] On Behalf Of Glen<br>
English VK1XX<br>
Sent: Thursday, 7 December 2017 4:55 PM<br></span><span class="">
To: <a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a> <mailto:<a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a>><br>
Subject: Re: [OZAPRS] Hf gates CD<br>
<br>
tracker might well have CD but:<br>
<br>
1) Consider that in the mobile, you wont hear any<br>
stations less than the skip distance (unless they are<br>
10km away) . The daytime skip distance might be<br>
700km.... so anyone inside that distance you wont<br>
hear cause the ionosphere wont support it..it wont<br>
support any angles higher than perhaps 45 degrees.<br>
<br>
The base station though will hear lots of<br>
transmissions from lots of stations >700km to 1500km<br>
away, so there would be significant collision chance<br>
if the position update is too often. Maybe 10 minutes<br>
might be suitable. I dunno why people run..<br>
<br>
2) With a 5% to 10% efficiency mobile you wont hear<br>
too much unless the propagation is optimal...<br>
<br>
<br>
glen<br>
<br>
<br>
<br>
<br>
<br>
On 7/12/2017 5:41 PM, <a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.net</a><br></span><span class="">
<mailto:<a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.n<wbr>et</a>> wrote:<br>
<br>
Blind ?<br>
<br>
Tracker has CD<br>
<br>
-----Original Message-----<br>
From: OZAPRS [mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.ne<wbr>t.au</a><br>
<mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.ne<wbr>t.au</a>>] On Behalf Of<br>
Glen English VK1XX<br>
Sent: Thursday, 7 December 2017 2:46 PM<br></span><span class="">
To: <a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a> <mailto:<a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a>><br>
Subject: Re: [OZAPRS] Hf gates<br>
<br>
but how does this matter?<br>
<br>
You will be transmitting on a frequency blind<br>
<br>
there will be receivers you cannot control<br>
<br>
There will be any number of propagation modes you<br>
cannot control...<br>
<br>
<br>
<br>
On 7/12/2017 3:34 PM, Andrew Rich wrote:<br>
<br>
Hi<br>
<br>
Can I get a list of hf gates on 10.147<br>
<br>
In my planning for the Xmas run<br>
<br>
Cheers<br>
<br>
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</span></blockquote><div class="HOEnZb"><div class="h5">
<br>
<br>
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