[OZAPRS] HF Mobile XMAS

[Andrew Rich]

30m whip on car

Waiting tinytrak 3



Sent from my iPhone

> On 1 Dec 2017, at 8:26 am, Glen English VK1XX <glenlist at pacificmedia.com.au> wrote:
> 
> yep try  stick to the highest frequency the path will support, stick near the OWF (approx  85% of the monthly median MUF)
> 
> 1) This will reduce/eliminate the production of multi hops/ multipath which in turn causes frequency dependent fading
> 
> - that is one of the FSK tones may be in a fade, and the other tone not in a fade. A couple of milliseconds of path difference will generate a 500Hz comb filter.
> 
> 2) Antenna efficiency is increased, galactic and atmospheric noise is reduced.
> 
> 3) Force a longer path/lower angle that will change less with ionization, IE less frequency changes throughout the day. For a 1000km path mid latitude , you can probably work with two frequencies the whole day.
> 
> Given we have multiple bases, then I expect 10 MHz would be usable 24 hours a day.
> 
> And given that there are multiple bases, there is receiver diversity, path diversity, and given the number of base options, generates a very high reliability system.
> 
> Of course there is the other end of the spectrum, 160m... which has equally useful traits....but you need to work much harder on the mobile antenna.
> 
> 
> 
>> On 1/12/2017 7:57 AM, vk4un wrote:
>> I use the same setup Andrew on 30 meters and it works 99% of the time where 40 meters won't work as well
>> Remember the freq is 10.147.6
>> 
>> David  Vk4un
>> 
>> 
>> -----Original Message-----
>> From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Andrew Rich
>> Sent: Thursday, 30 November 2017 1:13 PM
>> To: Australian APRS Users
>> Subject: [OZAPRS] HF Mobile XMAS
>> 
>> Hello
>> 
>> I am planning to drive from Brisbane to Melbourne this December
>> 
>> With HF APRS on board
>> 
>> I think 10.147 MHz will be the go
>> 
>> ICOM 706MKIIG
>> 
>> Andrew
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> 
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