How do most of you pilots set up a flight plan and what nav-aids doyou use.

Bob Nixon wrote:
On Nov 10, 6:10*pm, Jim Logajan wrote:
Bob Nixon wrote:
The UART that I used to install back in *73 was a yellow colored
snap
-
on or Velcro battery powered emergency location crash transmitter
box.

Aha! Perhaps you mean AN/URT beacon set radio, right? As in this:

http://www.tpub.com/1ase2/43.htm

To me, UART means "Universal Asynchronous Receiver/Transmitter" and
was a handy chip to have when one wanted to convert serial bit stream
to parall
el
byte streams and vice versa (as in modems and such.) Sure beat wiring
together (and debugging) discrete TTL chips to accomplish the same
thing.

I must have gotten those acronyms messed up over the years, How about
ELT for emergency location transmitter?

Works for me.

In article ,
Jim Logajan wrote:

Bob Nixon wrote:
On Nov 10, 6:10*pm, Jim Logajan wrote:
Bob Nixon wrote:
The UART that I used to install back in *73 was a yellow colored
snap
-
on or Velcro battery powered emergency location crash transmitter
box.

Aha! Perhaps you mean AN/URT beacon set radio, right? As in this:

http://www.tpub.com/1ase2/43.htm

To me, UART means "Universal Asynchronous Receiver/Transmitter" and
was a handy chip to have when one wanted to convert serial bit stream
to parall
el
byte streams and vice versa (as in modems and such.) Sure beat wiring
together (and debugging) discrete TTL chips to accomplish the same
thing.

I must have gotten those acronyms messed up over the years, How about
ELT for emergency location transmitter?

Works for me.

Me too. Of course this is also optional equipment in many
circumstances....

--
Mike Ash
Radio Free Earth
Broadcasting from our climate-controlled studios deep inside the Moon

Mike Ash wrote:
How about
ELT for emergency location transmitter?

Works for me.

Me too. Of course this is also optional equipment in many
circumstances....


There are ELTs and ELTs...
the usual article may have a remote switch, but emits on 121.5 and 243
MHz I watched the fellow in the next hangar testing his g switch:
he replaced the battery, then swung the ELT smartly against a tire.
At 5 to the hour, naturally... There was a recent alert about stuck g
switches, I hear.

The later article features 406MHz emissions I hear. I must find out more
about them.

Brian W

In article ,
says...

Mike Ash wrote:
How about
ELT for emergency location transmitter?

Works for me.

Me too. Of course this is also optional equipment in many
circumstances....


There are ELTs and ELTs...
the usual article may have a remote switch, but emits on 121.5 and 243
MHz I watched the fellow in the next hangar testing his g switch:
he replaced the battery, then swung the ELT smartly against a tire.
At 5 to the hour, naturally... There was a recent alert about stuck g
switches, I hear.

The later article features 406MHz emissions I hear. I must find out more
about them.

You should - 'cos yer a bit out of date on the info thesedays. 406Mz
ELT's are manditory in most countries now.

Also the monitoring Cospass-Sarsat satellites will not find you with a
121.5Mz ELT as they don't monitor it anyymore. You'd better hope for a
nearby commercial aircraft that's monitoring 121.5 - it's about your
only chance now days.

The 406Mz system is also lots more accurate for position determination,
and, the beacons must be registered (registration of 121.5Mz devices was
never manditory).

--
Duncan.

Dave Doe wrote:
....

You should - 'cos yer a bit out of date on the info thesedays. 406Mz
ELT's are manditory in most countries now.

Also the monitoring Cospass-Sarsat satellites will not find you with a
121.5Mz ELT as they don't monitor it anyymore. You'd better hope for a
nearby commercial aircraft that's monitoring 121.5 - it's about your
only chance now days.

The 406Mz system is also lots more accurate for position determination,
and, the beacons must be registered (registration of 121.5Mz devices was
never manditory).


Hi, User posting as Dave,

do you know how to relate emission frequency
to the length of a corresponding quarter wave whip?

Brian W

g'day Brian,

Call frequency "f". Speed of light c = 3*10^8 metres/second. Wavelength =
c/f in metres. Quarter-wave antenna length then is c/4*f.

So, 406 MHz, call it 400 to simplify a bit. Wavelength = 3*10^8/400*10^6 =
3*10^8/4*10^8 = 0.75 metres. Quarter wave a bit under 20 cm, which would be
a bit under 8 inches old scale.

Cheers ... MikeW.

"brian whatcott" wrote in message
...
Dave Doe wrote:
...

You should - 'cos yer a bit out of date on the info thesedays. 406Mz
ELT's are manditory in most countries now. Also the monitoring
Cospass-Sarsat satellites will not find you with a 121.5Mz ELT as they
don't monitor it anyymore. You'd better hope for a nearby commercial
aircraft that's monitoring 121.5 - it's about your only chance now days.

The 406Mz system is also lots more accurate for position determination,
and, the beacons must be registered (registration of 121.5Mz devices was
never manditory).


Hi, User posting as Dave,

do you know how to relate emission frequency
to the length of a corresponding quarter wave whip?

Brian W

Yes indeed, Mike. Or close enough. If you buy the copper tape antenna
and stoppers from the avionics guru who lurks on r.a.homebuilt he will
want to sell you something to trim a little shorter to account for the
local speed of light (c) on a 1/4 .

My nose was a little out of joint initially with yet another slightly
snippy and mis-spelled note from an anonymous poster on this
crap-infested group. [Brings to mind the idea of adolescent poseurs
with dirty ears and dirtier mouths...]
....But he was in fact doing me a service in prompting me to look out the
requirements for 406MHz ELTs in the US.

These turn out to include the requirement for a 406MHz ELT on NEW light
aircraft and ANY light aircraft going international (if I got it right).
This could happen, I suppose. I have made the Oshkosh pilgrimage, and I
am fixing to visit Corpus Christi in the other direction....
I am not thrilled by the prices however. Surely there must be cheaper
examples out there than the $800 specimens? A new Ameriking dual Fx
costs $150 after all....

The initial point was that a glance at a light aircraft will show
whether it is equipped for 121.5 (or 121.5 and 243Mz) or 406Mhz.
The great majority of aircraft that I see, have a 20+ inch whip or rod.

Brian W


MikeW wrote:

g'day Brian,

Call frequency "f". Speed of light c = 3*10^8 metres/second. Wavelength =
c/f in metres. Quarter-wave antenna length then is c/4*f.

So, 406 MHz, call it 400 to simplify a bit. Wavelength = 3*10^8/400*10^6 =
3*10^8/4*10^8 = 0.75 metres. Quarter wave a bit under 20 cm, which would be
a bit under 8 inches old scale.

Cheers ... MikeW.

/snip/

Hi, User posting as Dave,

do you know how to relate emission frequency
to the length of a corresponding quarter wave whip?

Brian W