[ARC5] Advice requested. AN/ARN-7 Controls

[J. Forster]

> John wrote:
>
>> The Control Box is for an ARN-6 or ARN-7... I never remember which is
>> wich.
>
> No, there is never any confusion made between the C-4/ARN-7 and the
> C-149/ARN-6. Those are very different visually.

Not if you only collected MN-26s. I never studied the other three.

> What is often confused is the BC-434-* control box for the BC-433-*
> (SCR-269-*) ADF,
> versus the C-4/ARN-7 control box for the R-5/ARN-7 ADF.  The AN/ARN-7 ADF
> is just
> a SCR-269-* ADF with a fourth band from 100 to 200 kHz added, plus a
> CW-VOICE switch
> on the control box.
>
> Just remember...
> Three bands on the control box = SCR-269-*
> Four bands on the control box = AN/ARN-7
>
> The presence of the CW-VOICE switch is a little less of a distinction
> since many
> BC-434-* control boxes had a CW-VOICE switch added.
>
> So Ken's control box is the C-4/ARN-7.
>
> And with all that in mind, the control box on ebay that was cited at
>
>    http://www.ebay.com/itm/261172459854
>
> is obviously NOT the item that Ken has.  It is a BC-434-* (three-band, no
> CW-VOICE
> switch).
>
> The AN/ARN-6 (R-101/ARN-6) is a considerable advance over the R-5/ARN-7.
>
>> The Junction Box is for a more complex system with more than an ADF.
>
> Well...it's for systems using *ONE* ADF (here, R-5/ARN-7) with *TWO*
> control boxes
> C-4/ARN-7.  One control is located in the pilot's cockpit, the other at
> the
> navigator's (or rarely radio operator's) position.  The "CONTROL"
> pushbutton on
> a control box is pushed momentarily to assume control of the common
> R-5/ARN-7
> at that particular control box.

There were too many cables and some Jones plugstoo.

> The SCR-269-* and most other USAAF ADFs utilized the same type of control
> transfer system.
>
>> The MN-52J is for either a MN-26 or much more likely an RA-10. The
>> second
>> toggle is a dead giveaway for te RA-10...  it's for the Loop Relay in
>> the
>> RA-10 front panel mounted switch box.
>
> Yes...RA-10** Receiver with MR-11* Loop Relay Unit and MN-20* Loop,
> controlled
> by MN-52* Loop Control box.  This item has nothing to do with the MN-26
> RDF, nor the AN/ARN-7 ADF components shown.

It works just fine to rotate the loop on an MN-26 and indicate its
position. You just don't wire up the Loop/Ant switch to anything. Other
than the second switch and possibly the connector it is identical to the
MN-26 one. I never said it had anything to do with the ARN-6/-7. It's for
a MDF.

-John

===========.
>
> Mike / KK5F
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