[R-390] The R-725 and the DF story?

Mon, 08 Dec 2003 16:27:05 -0500

Where is a copy of this TM that can be had?  Sounds interesting.  I think the goniometer was in fact a rotating antenna inside a shield/can with a small opening or aperature, with continuous angle readout as it rotated (?)  Or did the can and aperature rotate?  So you would tune the radio to the signal of interest, turn on the gonio to start spinning, then a processor of some sort would detect the pulse at the IF output as the gonio slit swept the direction of the target, then read out the gonio angle.  That then was the heading to the target.  Pretty cool.  They do it these days with fixed antennas and interferometric techniques.  So if the filters had a lot of ringing or delay distortion, that could throw the timing off.

----- Original Message -----
From: "Richard M. MC Clung" <[email protected]>
Date: Monday, December 8, 2003 12:17 pm
Subject: Re: [R-390] The R-725 and the DF story?

> If you want to know where the R-725 was used you can see it all in TM
> 11-5825-231-10, Direction Finder Set AN/TRD-15/23.
> 
> The fact is that the mechanical filters caused phase distortions which
> provided for inacurate bearing readings in the goniometers.
> 
> RICH  WA6KNW
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