[R-390] R-391/URR (MOD) - Direction Finder Set AN/FRA-44 --- Receiving Set AN/FLR-7

Wed, 28 Jan 2004 23:23:42 -0800

Thanks for the info.  I thought I had searched the entire mailing list
archive, but for some reason when I try to download it from qth.net, the
download indicates that it is 23MB in size, but it always quits at about
10MB.  My copy covers Dec 2001 to Aug 2002.  I wonder if the file has been
corrupted on the server.  If anyone has a copy that they can email to me, I
would appreciate it.

Clay

----- Original Message -----
From: "LI WHA HO WALLY" <[email protected]>
To: "Clay Curtiss WA7KBR" <[email protected]>
Sent: Wednesday, January 28, 2004 3:31 PM
Subject: Re: [R-390] R-391/URR (MOD) - Direction Finder Set AN/FRA-44 ---
Receiving Set AN/FLR-7

> Clay, This set was discussed on this site early last
> year... The RCA mod consisted of two things.. First
> they provided a new IF strip with a 60 khz band
> pass... Then, they modified the bandpass of all of the
> RF cans to get a 60 or 70 khz band... If you have the
> original IF strip, then your receiver is about
> useless..  73's  Wally  k5op
> --- Clay Curtiss  WA7KBR <[email protected]> wrote:
> > Hi,
> > I'm new to the list and looking for some advice on
> > an R-391 (S/N 145) that I
> > have.  It was an original 1951 Collins unit
> > (contract 14214-PH-51-93) and
> > was modifed by RCA for the Navy and has an
> > additional 3"x2"metal tag on the
> > front panel below the function switch.  It reads as
> > follows:ass.
> >
> > R-391/URR (MOD)
> > RECEIVER, RADIO
> >
> -------------------------------------------------------------------------
> > A UNIT OF DIRECTION FINDER SET AN/FRA-44 (XN-1)
> > COUNTER MEASURES RECEIVING SET AN/FLR-7 (XN-1)
> >
> -------------------------------------------------------------------------
> > MODIFIED FOR
> > NAVY DEPARTMENT - BUREAU OF SHIPS
> > BY CONTRACTOR
> > RADIO CORPORATION OF AMERICA
> > CAMDEN, NJ
> > CONTRACT NObsr 81315
> > US
> >
> > I've searched this list's archives, but find no
> > mention of it.  I tried
> > google and came up with a reference to Antenna
> > AN/FLR-7 on www.r-390a.net in
> > the FAQ as follows:
> >
> > This Wullenweber antenna, also known as a Circularly
> > Disposed Antenna Array
> > (CDAA), consisted of a large number of 200 foot
> > towers arranged into a ring
> > more
> > than 1300 feet in diameter.  An inner ring of
> > shorter towers competed the
> > array.
> > The antenna reportedly operated from VLF well into
> > the VHF frequency range.
> > It
> > provided direction finding accuracy to within two or
> > three degrees,
> > according to
> > some reports.
> >
> > When I first got it, it worked but always had
> > ringing in the audio.  I
> > suppose it could have been modified to have a very
> > narrow IF bandpass.
> >
> > Does anyone have any info on how this R-391 was
> > modified by RCA?  I suspect
> > that there weren't very many of these made, and I
> > don't know if it is rare
> > enough or interesting enough for anyone to care
> > about.  Would it be best to
> > leave a unit like this in it's current
> > configuration, or to try to convert
> > it back to a stock R-391 again?
> >
> >
> > Thanks for any and all help.
> >
> > Clay
> > WA7KBR
> >
> > _______________________________________________
> > R-390 mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/r-390
>
>
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