[ARC5] Ceramic Beads

[Craig]

Hi Mike: Thanks for the diameter info, as I couldn't remember what it 
was. As to the number of beads, the book calls out a quantity of 450 of 
them. The AT ran a two transmitter, three receiver set up. Where the 
extra length comes into play, is that both transmit lead are routed 
differently to the BC-442.

The next trick is finding some W-106-A antenna wire in bulk.


Craig

KF5JOT

Fairchild AT-21-BA


On 05/23/2018 05:31 PM, Michael Hanz wrote:
> They are IN-83 beads, Craig.  From my web page on insulators 
> (http://aafradio.org/docs/aircraft_antenna_insulators.html ):
>
> IN-83 is a Signal Corps designation, and is 5/16" in diameter, 48 
> beads per foot, which is about 1/4" long nested in the next bead.
>
> Man, 500 seems a lot for an aircraft the size of the AT-21, but I'm 
> sure you've done the measurements.  Even with the two ART-13's in the 
> Enola Gay, I don't think we had more than maybe 7-8 feet. They 
> designed the runs to get the RF out of the shack and through the 
> fuselage as directly as possible.  I'm assuming you are just using 
> them for the Liason transmitter.
>
>   Hope that helps,
>  - Mike  KC4TOS
>