[OZAPRS] HF Mobile XMAS

[Glen English VK1XX]

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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