[ARC5] Question on ARC Type 12 R-11A receiver.

[D. Platt]

Ken,

The plot thickens.....  Now looking at TM 525-25 (dated April 1955), 
note 5 says:

A short antenna is defined as one having and effective capacitance of 
21-50uuf and a long one as 50uuf or greater.  Beginning with s/n 530 of 
R-11A (14v) and s/n 405 of R-11 (28v) "A" antenna terminal post 
connection was deleted and "L" antenna terminal post was marked "A".

Might that do the deed for you?

Jeep - K3HVG



On 8/5/2014 8:12 PM, Kenneth G. Gordon wrote:
> A schematic diagram I have of the ARC R-11A Type 12 MF receiver shows a
> notation on it near the antenna input. To wit:
>
> "LONG ANT (NOTE 5)" then "SHORT ANTENNA (NOTE 5)" and "C-601 50
> (60MMF) (NOTE 12)"
>
> There are no "notes" on the schematic, and I cannot find them in my copy of
> the ARC Type 12 maintenance manual.
>
> Does anyone here have any idea to what this all refers?
>
> How long or short are the long and short antennas?
>
> An interesting thing I did find in the manual, though, states that the R-11A
> MF receiver, and the R-10A BC band receiver, should test with a sensitivity
> of less than 1 microvolt when properly aligned.
>
> I am wondering if the 14S7 is a "quieter" mixer than the 12K8?
>
> Kenneth G. Gordon W7EKB
>
> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>
>