Ttransponder question #3

Is this likely somehow related to the cold temp?

Yep, most definitely. The older non-solid-state transponders use a
cavity in their tx circuit, and the geometry of the assembly is
critical to getting it to work. It can be close enough that it works
when it is warm and expanded to its usual operating conditions, but far
enough off that it won't work when it's cold. My KT-76A did this a
couple of times, and needed to be tweaked back in by the radio shop.
It's an easy enough fix, but they do tend to slip out of alignment
again after a while.

Another thing that can cause transponder/ATC problems: dirt
and oil on the antenna. It apparently can detune things just enough to
cause intermittent or nonexistent returns on the controller's scope.

Dan

TaxSrv wrote:
Is simply what they do. The microprocessor in the Kings invariably
sets the delay; Narco merely first charges up a capacitor which
takes about 30 sec. So, whether she needs "warm-up" or not, it
can't xmit until the light goes out.

We're arguing the same side of the discussion (ie, we're in aggreement).


--
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Jay and Teresa Masino ___(_)___
http://www2.ari.net/jmasino ! ! !
http://www.OceanCityAirport.com
http://www.oc-Adolfos.com

"Newps" wrote in message
...

Wow, lots of misunderstanding out there. Recycle transponder means to
turn it off and then back on again. "Check your transponder on" means you
have taken off and we are not receiving it when we expect to. "Check mode
C on" means we are getting the transponder but no altitude information.
If we are getting the transponder return and an altitude but you didn't
tag up properly it is because the code is wrong. 75% of the time it is
because you entered it wrong, the other 25% of the time is because you are
hangaing on to that piece of **** and even though you entered the code
right it decided to transmit a different code. Banging on it usually
clears it up.

Here's one that's maybe a bit different...

Tucson, AZ Clearance Delivery gives me a squawk of YYYY for departure from
the Class C airspace.

When I get handed off to ZAB Center, I check in with them for flight
follwing and the controller says "Recycle Transponder, Squawk XXXX."

They only mean to enter the new code, right? They aren't really asking me
to go to STBY, enter the new squawk, then go back to ALT, are they?

Is this correct phrasiology on their part?

Jay Beckman
PP-ASEL
AZ Cloudbusters
Chandler, AZ

I wrote to Bendix-King and they confirm there is a built in delay when
tuning on the KT-78 transponder. I would suspect it would apply to others.


-------------
Regards, Ross
C-172F 180HP
KSWI


TaxSrv wrote:
Be that as it may, I believe most transponders just
wait a static timeout amount (30-45 sec), whenever
transitioned from OFF to ON, even if you've
already had it on.

--- Jay



Is simply what they do. The microprocessor in the Kings invariably
sets the delay; Narco merely first charges up a capacitor which
takes about 30 sec. So, whether she needs "warm-up" or not, it
can't xmit until the light goes out.

Fred F.

Jay Beckman wrote:



When I get handed off to ZAB Center, I check in with them for flight
follwing and the controller says "Recycle Transponder, Squawk XXXX."

They only mean to enter the new code, right? They aren't really asking me
to go to STBY, enter the new squawk, then go back to ALT, are they?

Is this correct phrasiology on their part?

They should be saying..."reset transponder, squawk xxxx."

"Jay Beckman" wrote in message
news:FfsXe.253826$E95.128149@fed1read01...

Here's one that's maybe a bit different...

Tucson, AZ Clearance Delivery gives me a squawk of YYYY for departure from
the Class C airspace.

When I get handed off to ZAB Center, I check in with them for flight
follwing and the controller says "Recycle Transponder, Squawk XXXX."

They only mean to enter the new code, right?


Right.



They aren't really asking me to go to STBY, enter the new squawk, then go
back to ALT, are they?


No.



Is this correct phrasiology on their part?


No, correct phraseology would be just "Squawk XXXX".