[Premium-Rx] R-1051F

Clemens Ostergaard clemenso at gmail.com
Mon Sep 9 13:58:53 EDT 2019 

Then at least the Iowa would have been fine receiving CW on the AN/URR-74s
with their 0,3 and 1 khz filters. Mustn't forget that even if USN stopped
using CW, many other interesting sources did not.

Clemens

On Mon, Sep 9, 2019 at 7:21 PM Nick England <navy.radio at gmail.com> wrote:

> For anyone interested, I have photos of the USS Iowa installation at
> http://www.navy-radio.com/ships/bb61.htm
> The SA-2112(V)4/STQ Switching Matrix (Coke Machine) is shown, as are a
> batch of R-1051G receivers and three W-J AN/URR-74(V)2 receivers.
> The black receiver and transmitter switchboards are shown. As stated the
> crypto gear was all removed but the Red Phones can now connect through the
> Coke Machine direct to the black switchboards and thence to receivers and
> transmitters.
> Cheers,
> <http://www.navy-radio.com/ships/bb61/DSC02120.JPG>
> Nick England K4NYW
> www.navy-radio.com
>
>
> On Mon, Sep 9, 2019 at 12:36 PM sm0aom at telia.com <sm0aom at telia.com> wrote:
>
> > "There's a very elaborate switching matrix machine called "the Coke
> > Machine"
> > because its large and painted red (because it operates the classified
> data
> > path) which is used to route signals to/from the radio array on the ship"
> >
> > If the installation was done according to proper TEMPEST rules, the "Coke
> > Machine" would be
> > the "red matrix" which is connected in the un-encrypted signal paths
> > between the crypto devices and the "red" phones or data terminals.
> >
> > On the other, encrypted, side there would be one or more "black matrices"
> > or patch panels for assigning crypto equipment and modems to their
> > respective
> > radio equipment.
> >
> > Modern TEMPEST design rules prescribe physical separation or
> "air-gapping"
> > between "red" and "black" equipment.
> > Everything directly connected to the modulation input of a radio
> > transmitter or the line audio of a receiver is by definition on the
> "black"
> > side.
> >
> > 73/
> > Karl-Arne
> > SM0AOM
> >
> > ----Ursprungligt meddelande----
> > Från : jcp at pistritto.org
> > Datum : 2019-09-09 - 16:59 (CEST)
> > Till : vk5abc at adam.com.au
> > Kopia : Premium-Rx at mailman.qth.net
> > Ämne : Re: [Premium-Rx] R-1051F
> >
> > Well people who operated on the ship said they had never used CW on that
> > radio.  The Navy almost always used ISB often with different (usually
> > digital) feeds to each sideband.
> > (the switching matrix after the radio separated the sideband audio
> streams
> > and sent them to potentially different decoders, some of which are still
> > there. (the classified ones were removed).).
> >
> > There's a very elaborate switching matrix machine called "the Coke
> Machine"
> > because its large and painted red (because it operates the classified
> data
> > path) which is used to route signals to/from the radio array on the ship.
> >   There are also manual preselectors to control the path from the
> > *antennas* (which the ship has several types) to individual radio stacks,
> > separately for receive and transmit.  The receive and transmit radios are
> > actually located in different rooms on the ship.  There were about a
> dozen
> > R-1051s in the radio room that were connected to it.  I've learned how to
> > set up a path using "the Coke Machine" on board, its really a big cross
> > point switch that is electronically (from a keyboard) controlled.   All
> > this equipment was installed in the 1980 refit ofthe ship when Reagan
> > recommissioned the 4 Iowa class battleships as part of the 600 ship Navy
> > plan to compete with the Soviets, who were still a thing then (till
> 1989).
> >
> > If you happen to be in LA, going to see the Iowa is a great example of
> late
> > 1970s radio engineering as all the radio equipment on board was updated
> > then.   They also have a couple of the Racal radios that people
> > discussion on this list, at least one of which is actually working and
> used
> > by the "Gray Radio club" which are the people who operate the ship's
> > original equipment on the air.   There's also a regular "ham radio" club
> > which uses conventional ham equipment using the ship's antennas, they put
> > the Iowa on the air for Museum Ship Weekends
> > <http://www.arrl.org/Events/view/130911> and such.
> >
> >
> >
> > On Mon, Sep 9, 2019 at 7:51 AM L D Ritta <vk5abc at adam.com.au> wrote:
> >
> > > Well the mode selector module only has three filters lsb usb and am
> > > So what did they use for cw or didn't they
> > >
> > > -----Original Message-----
> > > From: premium-rx-bounces at mailman.qth.net
> > > <premium-rx-bounces at mailman.qth.net> On Behalf Of Joseph Pistritto
> > > Sent: Tuesday, 10 September 2019 12:10 AM
> > > To: Clemens Ostergaard <clemenso at gmail.com>
> > > Cc: Premium-Rx at mailman.qth.net
> > > Subject: Re: [Premium-Rx] R-1051F
> > >
> > > I work on the USS Iowa museum ship which has a large # of those radios
> in
> > > place.  They were rarely used for CW (but a lot of various RTTY-like
> > > digital
> > > modes)  The ham club on the ship actually uses them on the air from
> time
> > to
> > > time.
> > >  - jcp-
> > >
> > >
> > > On Mon, Sep 9, 2019 at 7:10 AM Clemens Ostergaard <clemenso at gmail.com>
> > > wrote:
> > >
> > > > So it relies on the bandwidths 7 and 3 khz. Leading one commentator
> on
> > > > eham to say :
> > > >
> > > > "The CW mode is all but useless, it's easier to use the USB mode on
> CW
> > > > instead."
> > > >
> > > > It was optimized for ISB, not for CW
> > > >
> > > > Best , Clemens
> > > >
> > > > On Mon, Sep 9, 2019 at 3:38 PM Nick England <navy.radio at gmail.com>
> > > wrote:
> > > >
> > > > > The R-1051 models do not have a separate narrow bandpass filter for
> > > > > CW or RATT (FSK). These modes use the LSB filter but with different
> > > > > BFO
> > > > injection
> > > > > frequency.
> > > > > Nick
> > > > >
> > > > > On Mon, Sep 9, 2019 at 7:49 AM L D Ritta <vk5abc at adam.com.au>
> wrote:
> > > > >
> > > > > >
> > > > > > Hello All
> > > > > >
> > > > > >
> > > > > > What sort filter does  the R-1051 receiver have  for cw mode Or
> > > > > > does it?
> > > > > >
> > > > > >
> > > > > > 73's Lee de vk5abc
> > > > > >
> > > > > >
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> > > > > >
> > > > > --
> > > > > Nick England K4NYW
> > > > > www.navy-radio.com
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