[ARC5] US Submarine ELINT WWII, (was British ZB......?)

[Brooke Clarke]

Hi Hue:

The very early radio altimeters worked based on the impedance looking into the antenna (as did the Proximity Fuze).  So 
by tuning the frequency of each of them slightly off they would not interfere with each other.
The APS-13 was an FM modulated CW Doppler radar, not a pulse type. Again, I expect that if the carrier frequencies were 
slightly different they would not interfere with each other.

https://www.prc68.com/I/WallaceTiernanFA181.shtml#Electronic_Altimeter and scroll down a little.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> If "the bomb" package included 4 of APS-13, how did they keep them from interacting? I wouldn't
> think the APS-13 had a lot of selectivity OR frequency agility to tune apart. Since it's output was
> analogue, how would this have triggered at a set height?
> -Hue Miller
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