[Milsurplus] SCR-269 & SCR-273 differences

[C.Whitaker]

de WB2CPN
Question:  What's the MN-20E loop used with?
It can be mounted on either the top or bottom of
the aircraft.
I'd like to find a spline cable or something to turn
it with.  Anyone have any ideas?
Tnx  Clete
+++++++++++++++++++++++++++++++++++++

On 4/12/2013 11:47 AM, Sean Barton wrote:
> 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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