[Milsurplus] USN RBM vs. RBS Questions

Mon, 11 Aug 2003 19:27:00 -0400

Hue, Wally & Crew:

The RBM setup was quite a contraption as a full "outfit".

The two receivers were mounted in a transit case with a lid that provided a
sort of desk if needed.  You had your choice of separate rectifier or
dynamotor power supply running off lead acid batteries.  Either one supplied
both receivers.  The case mounted on 3 tripod type legs. I think there was a
control unit as well, but the receivers could be directly connected to the
power supply.

Anybody out there have a setup with the transit case?

Barry

----- Original Message -----
From: "LI WHA HO WALLY" <[email protected]>
To: "Hue Miller" <[email protected]>
Cc: <[email protected]>
Sent: Monday, August 11, 2003 6:07 PM
Subject: Re: [Milsurplus] USN RBM vs. RBS Questions

> Hue, As you know the RBM consisted of two receivers
> ... One for LF and a 2 to 20 mc HF... The RBS is
> almost the same as the RBM HF... The IF freqs are
> different... The RBS is 455 and tne RBM HF is 1255 kc
> I think... The schematic diagrams are the same even
> down to the part numbers.. The Navy had an RBS abord
> every ship, it  was
> used to receive time ticks to check the ship's
> chronometers... The dials are marked because non-radio
> people operated them.. They had no speakers, only
> fones with long leads... I own an RBS, but I have no
> manuals for either the RBM or the RBS.. Yes, the RBM
> was used ashore with the TBW by the Marines... 73's
> K5op  WALLY
>
>
>
>
>
> --- Hue Miller <[email protected]> wrote:
> >
> > ----- Original Message -----
> > From: "Morrow, Michael A." <[email protected]>
> >
> >
> > > I have no manuals for either, so I was wondering
> > what actual differences
> > > exist between the RBM and the RBS receivers.  I've
> > noticed only:
> > > (1)  Name plate (of course),
> > > (2)  Tuning lock on the RBS that isn't on the RBM,
> > > (3)  Control knobs engraved with first letter of
> > the control's function on
> > > the RBS.
> > >
> > > Everything else appears identical, so I'd be
> > tempted to assume that the
> > > circuits would be identical.
> >
> > Letter-marked knobs on RBS are the only difference.
> > I think that's
> > radium paint, the B, T marks on the knobs. Also, you
> > will never
> > see an RBS with the scrolling-towel logging chart
> > thing.
> > >
> > > Aside from that, what transmitter was normally
> > used with the RBS,
> >
> > No transmitter! Auxiliary equipment= the splashproof
> > cover for
> > outside mounting, and the "big" PS with audio power
> > amp.
> >
> > >and what  was the general nature of the
> > installations for which it was designed?
> >
> > So far, it seems the RBS with the big PS and splash
> > cover case
> > was intended for "alert-circuits", kinda like the
> > army's SCR-593
> > (right nomenclature) or later GRR-5.  "5 bogies
> > reported our way,
> > NE, estimated 10 minutes", that kind of thing.
> > But most reports, and all the photos available, seem
> > to only show
> > it as just an auxilliary communications receiver,
> > right in the
> > radio room, not out on the bridge.
> > I have my doubts on how great this might have worked
> > as an
> > alert receiver. The calibration is not very good,
> > and the dial tuning
> > is much too fast. I suppose the wide band with the
> > selectivity in
> > that position took care of that. Also, i don't
> > recall that the HF receiver is very stable either.
> > In
> > its favor, Uncle Sam paid $1000
> > WW2 dollars for each - a whole lot of money, and it
> > looks good,
> > nice architecture, very high quality construction, a
> > smart circuit
> > diagram, quality overall. It's just that the tuning
> > is not very good.
> > I suppose that's in keeping with how the military
> > actually used
> > most of their receivers....just set to frequency and
> > dial locked.
> > For actually using, for my money, the LF/MF receiver
> > is much more usable.
> > Hue Miller
> > _______________________________________________
> > Milsurplus mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/milsurplus
>
>
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