[ARC5] TA-12B/RA-10DB

[J. Forster]

Mike,

In fact, the loop function is optional on the RA-10. The relay box for the
loop on the front panel is not provided on all radios. It's a bolt on,
wire solder option.

Without the loop option, the loop, spline cable, special RF cable, loop
control, and loop relay are not used. W/o the loop, you probably don't
need the receiver meter either.

Best,

-John

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


> John wrote:
>
>> ...the RA-10 is a much under-appreciated radio.
>
> I think the whole TA-12/RA-10/MP-28 system has never had much
> regard given to it.  The TA-12B provided a lot of overlap in
> coverage of its three HF channels, while the RA-10 with loop
> adapter allowed both aural DF work and communications.  All that
> was needed was:
>
> MN-20E  RA-10DB Receiver DF Loop
> MN-52B  Control Box for MN-20E DF Loop
> MP-28BA Modulator with Dynamotor and Mount
> MR-9B   Control Box for RA-10DB Receiver
> MT-31C  Tuning Meter for TA-12B Transmitter
> MT-51C  Control Box for TA-12B Transmitter
> MT-53B  MF Tank Coil for TA-12B Transmitter
> RA-10DB	 Receiver with Dynamotor, Mount, and
> MR-11D  Loop Relay Unit
> TA-12B  Transmitter and Mount
>
> Plus maybe a MS-14B generic junction box and some MS-18B mic jack
> boxes.
>
> Plus, an LM or SCR-211 frequency meter would be essential.  There
> is no real calibration data provided for the TA-12 and RA-10.
>
> This relatively small amount of equipment provides:
>
> RA-10DB Receiver
> Band 1      150 to   400 KC
> Band 2      400 to  1100 KC
> Band 3     2000 to  5000 KC
> Band 3     5000 to 10000 KC
>
> TA-12B	Transmitter
> Channel 1:   300 to  600 KC
> Channel 2:  3000 to 4800 KC
> Channel 3:  4000 to 6400 KC
> Channel 4:  4370 to 7000 KC
>
> It seems like a pretty capable system that adequately covered all the
> spectrum that really was valuable for aviation use, pre-WWII.
>
> It's become fairly difficult to find all these pieces, and RA-10s have
> never seemed to be all that common.
>
> Mike / KK5F
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