[Premium-Rx] Shortwave receiver EN-R2, Intermarine Electronics Inc.

[sm0aom at telia.com]

There is some "family semblance" between the EN-R2 and other ITT receivers.

A tradition within the ITT conglomerate was to "look over the shoulders" of the developers in the sister
companies. 

Lots of the "family traits" between products, such as between the 
SRT CR91 and the ITT-Mackay MSR5050, can be explained in this way.

There were a lot of stories about American and British ITT staff visiting SRT and somewhat later developing
quite similar products.

Another example was the SRT STR950 and the very similar STC 800 W marine transceivers.

73/
Karl-Arne
SM0AOM 





----Ursprungligt meddelande----
Från : clemenso at gmail.com
Datum : 2020-11-07 - 09:30 (CEST)
Till : dh2fa at me.com
Kopia : premium-rx at mailman.qth.net
Ämne : Re: [Premium-Rx] Shortwave receiver EN-R2,	Intermarine Electronics Inc.

Rich is right to point to the (wonderful) most recent 2014 edition of Fred
Ostermann's book. It reveals that there might be only about 100 units of
the rx produced, in 1984. Filters 8,2,1, 0.4 and an empty slot. Intermarine
was an offshoot of more well-known CAI. Electro-Nav, which did not produce
any receiver themselves, may have been a somewhat fly-by-night setup,
cooperation between them and Intermarine soon ended, with Intermarine
issuing the rx in a very slightly changed EN-R3 version.

So in any case you have a rare receiver, Heinz, but good luck getting a
schematic.

Best regards,

Clemens S. Ostergaard
Copenhagen
DENMARK

On Sat, Nov 7, 2020 at 7:54 AM Heinz Breuer via Premium-Rx <
premium-rx at mailman.qth.net> wrote:

> Hello Gary,
> not even remotely similar in the internal setup. The ITT Mackay 3020 has
> an IF frequency of 8 MHz, a large preselector box in the middle with two
> card cages on the left and right.
> The power supply is in the back on the left.
> The Mackay 3020 has thumbwheel switches to set the frequency and neither a
> microprocessor nor any memories.
>
> As I already wrote I will provide more pictures early next week.
>
> vy 73 Heinz DH2FA, KM5VT
>
>
> Von meinem iPhone gesendet
>
> > Am 07.11.2020 um 05:25 schrieb Gary Geissinger <geissingergary at yahoo.com
> >:
> >
> > Looks a lot like a Mackay Marine 3020.  Both receiver companies have
> ties to ITT.
> >
> >
> > Sent from Yahoo Mail for iPhone
> >
> > On Friday, November 6, 2020, 2:26 PM, Heinz Breuer via Premium-Rx <
> premium-rx at mailman.qth.net> wrote:
> >
> > Hello,
> > here are three pictures, front, back and filter board.
> >
> > I can upload more pictures early next week.
> >
> > https://www.directupload.net/file/d/5994/n8u3w49x_jpg.htm
> >
> > https://www.directupload.net/file/d/5994/t39eudyo_jpg.htm
> >
> > https://www.directupload.net/file/d/5994/qtxlt3n5_jpg.htm
> >
> > vy 73 Heinz DH2FA, KM5VT
> >
> >
> > Von meinem iPhone gesendet
> >
> > > Am 06.11.2020 um 19:08 schrieb Keith Densmore <ve3gem at gmail.com>:
> > >
> > > Great find! Can you post a picture of it?
> > >
> > > Thanks, 73,
> > > Keith ve3ts
> > >
> > >> On Fri, Nov 6, 2020 at 10:56 AM Heinz Breuer via Premium-Rx <
> premium-rx at mailman.qth.net> wrote:
> > >> Hello to the group,
> > >>
> > >> out of an estate of an avid collector I picked up a shortwave
> receiver EN-R2 which was built by Intermarine Electronics Inc.
> > >> Unfortunately no address is given on the type plate, just „Made in
> USA“.
> > >> Various date codes on integrated circuits are from 1981.
> > >> Google didn’t find anything about it.
> > >>
> > >> Frequency range is 10 kHz to 30 MHz, tuning steps are 10 Hz, 100 Hz
> and 50 kHz. Operating modes are LSB, USB, CW, AM and F1B.
> > >> I count five crystal filters made by NETCOM, center frequency is 5.2
> MHz. There is an empty spot for a sixth filter but the front panel has only
> 4 push buttons to select filters which are labeled VNAR, NAR, INTR, LSB
> (very narrow, narrow, intermediate and LSB. If no push botton is pressed
> the USB filter is selected.
> > >> The receiver has an LCD display down to 10Hz.
> > >>
> > >> The receiver is in working condition but programming of the memories
> is not straightforward. I would appreciate to get a manual for it,
> hopefully with a schematic. I can receive AM broadcast stations but
> bandwidth is quite narrow.
> > >>
> > >> According to a glued on tag it seems that this receiver once served
> with the U.S.M.C. which probably translates to United States Marine Corps.
> There is a U.S.M.C. Plant Account No. listed.
> > >>
> > >> Any help appreciated.
> > >>
> > >> vy 73 Heinz DH2FA, KM5VT
> > >>
> > >> Von meinem iPhone gesendet
> > >> ______________________________________________________________
> > >> Premium-Rx mailing list
> > >> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> > >> Help Page: http://mailman.qth.net/mmfaq.htm
> > >> Post: mailto:Premium-Rx at mailman.qth.net
> > >> Help Contact eMail:  radio at 8zo.com
> > >> Home Page:  http://www.premium-rx.org/
> > ______________________________________________________________
> > Premium-Rx mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> > Help Page: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Premium-Rx at mailman.qth.net
> > Help Contact eMail:  radio at 8zo.com
> > Home Page:  http://www.premium-rx.org/
> ______________________________________________________________
> Premium-Rx mailing list
> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> Help Page: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Premium-Rx at mailman.qth.net
> Help Contact eMail:  radio at 8zo.com
> Home Page:  http://www.premium-rx.org/
>
______________________________________________________________
Premium-Rx mailing list
Home: http://mailman.qth.net/mailman/listinfo/premium-rx
Help Page: http://mailman.qth.net/mmfaq.htm
Post: mailto:Premium-Rx at mailman.qth.net
Help Contact eMail:  radio at 8zo.com
Home Page:  http://www.premium-rx.org/