[ARC5] Mystery Black Box

[J. Forster]

Correct. It's called a Pye. Also used on the APN-4 and APN-9 and WS 19.

-John

==================


>
> The RF connectors may provide a clue. They have a bail retainer and that
> seems to be to be used on UK gear.(?)
>  Smarter people speak up!
>  Jay
>
>
> -----Original Message-----
> From: Michael A. Bittner <mmab at cox.net>
> To: ARC5 <ARC5 at mailman.QTH.net>; Milsurplus <Milsurplus at mailman.QTH.net>
> Sent: Sat, Apr 26, 2014 3:19 pm
> Subject: [ARC5] Mystery Black Box
>
>
> I found this mystery black box in mint condition, still in its herm.
> sealed
> overseas packing at the TRW swap meet.  Does anyone have any further
> information
> on it?  Tech. manual availability?  See photos here:
>
> http://s1367.photobucket.com/user/kmmab/library/?sort=2&page=1
>
>
>
> Description
>
> Name/Nomenclature:                Frequency Converter CV-27/UPN
>
> Power:                                     115/80 Volts, 60/400 Hz, 1
> Phase
>
> Serial No.                                 A-327
>
> Contract No.                            CAON-2000-DAY-DE-AR
>
> Stock & Part No.                     1660-211 963 170 XD2 2C720-27
>
> Name of Activity or Mfg.:         Dayton AFD
>
> Date:                                        16 Dec 1955
>
> Tech. Order Compliance Record: 00-20K-11
>
>
>
> Front Panel Description (left to right):
>
> Top Row: Antenna Connector, Spare Fuse, Receiver Connector.
>
> Middle Row: 4-Pos. Antenna Match Switch, 3-Pos. Switch (HF/ L.F.
> Distant/L.F.
> Local)
>
> Bottom Row: Power Connector, Power Switch, Pilot Light, Fuse, 115V/80V
> Selector
> Sw.
>
>
>
> Size: 6-5/8" Wide x 6-1/8" High x 8-5/8" Deep (Not including shock mounts
> &
> controls)
>
>
>
> Tubes: 6SJ7, 6SA7, 6X5
>
>
>
> Probable Function:
>
> With middle 3-position switch in the L.F. Distant or L.F. Local positions,
> it
> probably converts signals in some unknown low frequency range to some
> unknown
> high frequency range for tuning on an HF receiver.  With the switch in the
> H.F.
> position, it probably connects the two antenna connectors together for
> normal HF
> reception on a connected HF receiver.
>
>
>
> I found an instruction manual reference at:
>
> http://books.google.com/books/about/Handbook_of_Operating_Instructions_for_L.html?id=r3mmtgAACAAJ
>
> http://www.jproc.ca/hyperbolic/loran_a.html
>
>
>
> The manual doesn't seem to be available in print or on line, but the
> manual
> title says "Loran Low Frequency Converter", so it has something to do with
> LORAN.
>
> My own experience is with LORAN A using the AN/APN-4 in the Martin PBM
> Mariner
> flying boat.
>
> A good description of LORAN A can be found at:
> http://www.jproc.ca/hyperbolic/loran_a.html
>
>
>
> Questions:
>
> So what did this black box do? Convert LORAN C to LORAN A?  Can't be
> because
> LORAN C wasn't invented yet in 1955.
>
> What LF range does it cover?
>
> What HF range is its output?
>
> How was is used, with what receiver(s), for what military purpose?
>
> Anybody know?  Guesses welcome.
>
>
>
> Mike - W6MAB
>
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