[OZAPRS] [aprssig] 434 MHz tracking
tfneumann at internode.on.net
Tue Aug 7 11:03:39 EST 2007
Andrew Rich wrote:
>Um the glider was at 8000 feet and i was on the ground.
>Mind you when I drove it, i got 1.9 km's out of it.
Blimey! An ASK-21 (like the one I usually fly) - 8,000 feet and they
only went 8 Km away? That's even more conservative than I am (and
that's saying something!).
Interesting exercise though. I've been wanting to do that for years.
One of our club's more adventurous pilots - who has the aircraft and the
talent to match his ambitions - quite often goes up to 300+ Km away
from our field here at Balaklava. He always gets back too. I've
wanted to stow a tracker in the back of his machine almost since I've
been working on APRS, but I've wondered about the legalities of putting
such a device in a situation where I'm not in absolute control of the
station and another person (non amateur) could be seen to be so. The
other fascinating aspect of putting a VHF tracker in his aircraft is
that his cross-country flights often are trips to the north from here
where there there are no other APRS activities, so it would be a good
test of airborne 2 metre propagation.
There are also airworthiness considerations in fitting such a device, as
well as a lot of avionics which may not like a burst of 8 watts every 5
minutes or so on a previously untried frequency. Theses
considerations aside, the new Byonics device would make it much easier,
however a non listening transmit device up to 15,000 feet in altitude
would be certain to get the wrong sort of attention.
Incidentally I've had a look at the manuals for the 8 watt device
currently under discussion. It seems to me that the power amp on this
package can be throttled back to give output below 8 watts and almost
down to zero. I'd be interested in such a device when anti collision
options are developed. However we can expect the price to go up and
there will be a further delay to incorporate a sensing device
(receiver?) of some sort. We could then find the price up to the level
of a current TT3 / micro handheld package - which is what I am working
on now for the gliding / motorbike / push bike experiments. And I do
like to make as much of my own gear as I can .............
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