[R-390] R-725

[Cecil Acuff]

Is it documented anywhere as to where the ferrite beads were placed....might 
be an interesting thing to try.

Cecil...
----- Original Message ----- 
From: "Mark Huss" <mhuss1 at bellatlantic.net>
To: "Kenneth Arthur Crips" <CRIPS01 at MSN.COM>
Cc: <r-390 at mailman.qth.net>; "Steve Hobensack" <stevehobensack at hotmail.com>
Sent: Sunday, August 21, 2005 4:07 PM
Subject: Re: [R-390] R-725


> 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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