ADF antenna

[Dan Luke]

What is the proper length?
Since my old one departed in flight, I have nothing to measure the new one
against.
--
Dan
C172RG at BFM

[mikem]

On Wed, 13 Aug 2003 12:24:41 -0500, "Dan Luke"
<c172rgATbellsouthDOTnet> wrote:

>What is the proper length?
>Since my old one departed in flight, I have nothing to measure the new one
>against.

Depends on the ADF. I have an installation manual for the Cessna ARC
R546? which shows the correct length of the sense antenna from top of
wing to the insulator. You can by a new stainless steel sense wire kit
from Chief and others.

MikeM

[Jim Weir]

It is pretty loose. The AGC makes up for a multitude of length errors. I
generally start out at 72" and go from there. Always worked for me.

Jim



mikem >
shared these priceless pearls of wisdom:

->On Wed, 13 Aug 2003 12:24:41 -0500, "Dan Luke"
-><c172rgATbellsouthDOTnet> wrote:
->
->>What is the proper length?
->>Since my old one departed in flight, I have nothing to measure the new one
->>against.
->
->Depends on the ADF. I have an installation manual for the Cessna ARC
->R546? which shows the correct length of the sense antenna from top of
->wing to the insulator. You can by a new stainless steel sense wire kit
->from Chief and others.
->
->MikeM

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

[Ron Natalie]

"Dan Luke" > wrote in message ...

> Why does it depend on the ADF? Wouldn't it be some fraction of an
> average wavelength for NDB frequencies?

It's a very tiny fraction of teh NDB frequency wavelength, which is over
200 meters. The radio has to have some internal matching for the
much shortened length.