[Milsurplus] Command Set ReceiverCoffee-Grinder

[Neil Barnett]

>> A second notion that I put forward for frequency changing was that it
>> might have been for tactical reasons, ie. pilots at briefing time might 
>> be
>> instructed to change their receivers every 15 minutes of the flight and 
>> the
>> frequencies to be used would be the sequence XXXX, YYYY, ZZZZ,
>> and so on, so that an enemy monitoring the flight commander's orders
>> about compass headings and other sensitive stuff would hear at most
>> 15 minutes worth and then would have to tune around for the new
>> command frequency. Its difficult for an enemy to plot your course when
>> you're doing that and flying a zig-zag course as well.
>
>
> Where this fails is in the fact that the pilots didn't have control of
> the transmitters' frequencies.  Further radio discipline would include
> not airing that information since all the aircrews would have
> foreknowledge of the flight plan.

I'm suggesting that the pilots didn't need control of the transmitter 
frequency.
They worked duplex. Orders such as compass heading issued on the XXXX,
YYYY, ZZZZ .... frequencies at every change and Roger'd by each pilot on
the fixed Roger channel. The enemy would never be sure when the frequency
change was about to take place, and would miss the vital information given
immediately after the change.

Did they do that? I dunno, but given the same equipment and circumstances
it's exactly what I would do.

73 de Neil ZL1ANM
Goodnight, 11:40 pm