[Milsurplus] SCR-269 & SCR-273 differences

[J. Forster]

Sounds a lot like the MN-26.

It had (stupoidly) never occured to me that the loop (not the tuning) on
an MN-26 might be done from more than one location, using a spline 'T'.

The bulkhead mounted crank and dial indicator are both two-port, with a
male spline on each end, so could be 'daisy chained' with standard spline
cables.

Does anyone know if that works in practice, or if the friction in the
components make it unworkable?

Best,

-John

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




> Dave,
>
> The SCR-273 uses a manually rotated loop antenna.  The I-75 indicator has
> spline connectors to connect it through an MC-204 crank to the loop
> antenna to rotate the loop and indicate bearing.  The I-65 indicator
> consists of a center-zero needle that indicates left-right course.  I have
> been gathering components for the SCR-263 system for a number of years
> which is the 24V version of the SCR-273 (with some minor differences).
>
> Sean
> KB0OVD
>
>> Date: Fri, 12 Apr 2013 09:02:54 +1000
>> From: davprin1 at optusnet.com.au
>> To: milsurplus at mailman.qth.net
>> Subject: [Milsurplus] SCR-269 & SCR-273 differences
>>
>> G'day all,
>>
>> I have a query about the differences between components of
>> these two Radio Compass systems. SCR-269-* was used in
>> aircraft with 12 or 24V electrics whereas the SCR-273-*
>> appears to be (more or less) the equivalent for use in
>> aircraft with only 12V electrics. The component of each
>> system are as set out below - other components not mentioned
>> such as cords and tuning cable/fittings are common to each
>> system.
>>
>> The receivers do have different frequency ranges.
>>
>> My question is, why the different indicator units? I thought
>> it might be just different illumination bulb voltages but
>> the SCR-269 can be used on both 12 and 24v anyway.
>> Functionally, can I use the 269 indicators on the 273?
>>
>> I would like to build up functioning systems for both
>> SCR-269 and SCR-273. I do have all the components for the
>> 269 and I have the receiver for the 273
>>
>> I would be interested to hear from anyone who has spare
>> components for the SCR-273 system particularly the control
>> box BC-414. The two control boxes look identical except for
>> the tuning ranges.
>>
>>
>> SCR-269 (12/24 volt)
>> Frequency ranges Band 1 - 200 to 410kc, Band 2 - 410 to
>> 850kc, Band 3 - 850 to 1750kc.
>>
>> BC-433* receiver
>> BC-434* control box
>> LP-21* loop antenna
>> BK-22* relay
>> I-82* indicator Navigators
>> I-81* indicator Pilots
>> PL-112 connector
>>
>>
>> SCR-273 (12 volt)
>> Frequency ranges Band 1 - 150 to 325kc, Band 2 - 325 to
>> 695kc, Band 3 - 695 to 1500kc.
>>
>> BC-413* receiver
>> BC-414* control box
>> LP-19* loop antenna
>> BK-21* relay
>> I-75* indicator Navigators
>> I-65* indicator Pilots
>> PL-117 connector
>>
>> Cheers
>> Dave
>> VK4KDP
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