[Milsurplus] Wanted

Wed Feb 1 02:56:49 EST 2017

.52 to 1.5.     ARC 6052.          MC-415.       ID-26/ARC-5
I would like one of these to  use as an AM radio!!
( maybe build a power supply inside a dynamoter looking like  case.....)

Ed#

In a message dated 1/31/2017 2:56:56 P.M. US Mountain Standard Time,  
kk5f at earthlink.net writes:

Larry  wrote:

> I have a pair of the BC-496 dual receiver control  box's.
> Neither has the small frequency dial scales.  Any extras  around?
> The current one is being used with a BC-453 and a BC-454 so  would
> like to find the frequency dials (small types) for those  two
> radios.

In the SCR-274-N, control box dials weren't  included with the control box. 
 In the ARA they usually were.  I've  obtained a complete set of dials (see 
below) for all three sets, except for  the BC-946-B.  I got most of them 
through ebay.

The early ARA and  all the SCR-274-N remote dials have a large flat front 
disk with a narrow  sharply-sloped outer rim on which the frequency scale is 
inscribed in small  non-luminous characters and gradations.  Later ARA and 
all AN/ARC-5  remote dials have a smaller front flat surface disk surrounded 
by a much  larger sloped rim with larger luminous characters and 
gradations...much easier  for a pilot to read.

> Also have a BC-946B that it would be nice to  have a small dial
> scale for as well.

The later ARA 6052 and  ID-26/ARC-5 dials for the BCB receivers show up 
rarely.  But the  narrow-rim small-character MC-415 remote dial for the 
BC-946-B is genuinely  really rare.  I'vd never been able to find one.

The scale  calibration is identical for the dials of all three systems, but 
I'd like to  find someday a real MC-415 for a SCR-274-N (communications) 
plus AN/ARR-1 (vhf  homing) system.  In that system, the BC-453B beacon 
receiver is removed  from the rack and replaced by a BC-946-B being fed RF from a 
R-1/ARR-1 VHF  "ZB" homing adapter.  The center section of the 
three-receiver control  box BC-450-A that was controlling the BC-453-B now gets the 
MC-415 dial and  controls the BC-946-B to demodulate the output of the R-1/ARR-1 
ZB homing  adapter.

> Any ARA control box's around? Have an ARA CBY-46104 1.5  to 3.0 mc
> receiver i'd like to try out.

The ARA CBY-23155  two-receiver remote control box is eletrically and 
mechanically identical to  your SCR-274-N BC-496-A control box.

There is no two-receiver control  box in the AN/ARC-5.  Two C-26/ARC-5 
single-receiver control boxes would  be needed for similar service use.

The entire SCR-274-N system is  identical to the ARA/ATA system without the 
1.5 to 3.0 MHz receiver and the  2.1 to 3.0 MHz transmitter, except for 
receiver and modulator sidetone AF  impedance.  The ARA/ATA uses low impedance, 
while the SCR-274-N uses  either high or high/low impedance.

> Same with AN ARC-5 R-24 and  R-25.

The receivers of the AN/ARC-5 are improved versions of the ARA  receivers 
that are backward compatible with both of the earlier systems.   Once you 
have a system set up to use your SCR-274-N receivers, you may mix and  match 
any of your ARA and AN/ARC-5 receivers with your SCR-274-N receivers in  your 
SCR-274-N racks.

"Command set" Receiver Remote Dial  Nomenclatures:

Freq Range.     ARA.       SCR-274-N.    AN/ARC-5
.19 to  .55.     ARC 6051.          MC-212.       ID-25/ARC-5
.52 to 1.5.   ARC 6052.         MC-415.     ID-26/ARC-5
1.5 to 3.0.     ARC 7575.   na.            ID-27/ARC-5
3.0 to 6.0.     ARC 6053.       MC-213.       ID-28/ARC-5
6.0 to  9.1.     ARC 6054.          MC-214.       ID-29/ARC-5

Typically, the A.R.C.  part number (6051, 7575, etc.) is the only 
identification that appears on the  back of these dials.

Two-Receiver.   ARA.       SCR-274-N.    AN/ARC-5
Control  Box.    CBY-, CCT-23155.  BC-496-A.      na

Mike /  KK5F
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