Altitude encoder

Ross Richardson wrote:
I think it was the Ameri-King AK-350 that I replaced for my Trans-Cal
when it went belly-up. You do have to wait for the encoder to out put a
signal. I first noticed this when my GPS messaged me that it had an
altitude fail. This occured for about 6 minutes. I called the avionics
shop and they explained the warmup that is required. Other than that it
does work fine. The GPS does require a valid encoder signal for IFR
operations.

6 minutes! Thats a long warmup. Is that during the summer or winter?
I live in Michigan so it may take a while to warm up during the winter.


Chad Lemmen wrote:

I need a new encoder. I currently have a Trans-Cal D120-P2-T. I can get
an overhauled exchange for $230. Should I do that or just replace it with
a new ACK A-30 or Ameri-King AK-350? The Ameri-King is the cheapest at
$150. I believe both the ACK and Ameri-King use an oven to compensate for
temperature variations, while the Trans-Cal does not. Is it better to
have one with an oven or without? Is the Trans-Cal a better encoder
making it worth the extra money?

Winter as it is in Texas. By the time I let the engine warm up, taxi
out, and do run up, the Altitude Fail message is gone. Summer, its gone
a little faster.

Ross


6 minutes! Thats a long warmup. Is that during the summer or winter?
I live in Michigan so it may take a while to warm up during the winter.