[R-390] R-725

[Mark Huss]

Basically an R-725 is an R-390A modified for HF DF using an array of 
vertical antennas and measuring the phase delay of the wavefront.  
Because of the phase shift in the mechanical filter across its response 
curve, they substituted an R-390 IF deck for the R-390A IF deck, then 
added a whole s***pot full of ferrite beads to suppress leakage normally 
present in the R-390A.  the result is the quietest and most sensitive 
R-390A made.  In the shop I worked in, they always had at least 6dBm 
better signal to noise ratio.

Kenneth Arthur Crips wrote:

>How does the R-725 differ from the R-390A. I can see the RF/IF deck is 
>different is that It or are there other differences.
>
>                                            Ken
>
>
>
>Kenneth A. Crips, W7ITC, Cheyenne,
>Wyoming. with The Chew Crew; Beezie,
>Chic', and Cowboy, Irish Terriers who
>are Red House ninjas with 10th degree
>Black belts in Bed Fue, Mooch Fue,
>Chew Fue, and Con Artist Fue
> 
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