[ARC5] More ZB

[Mike Hanz]

On 7/9/2011 12:37 PM, Robert Eleazer wrote:
> The F4U-1 Corsair pilot's manual, the one issued during the latter half of 1944 has the following info on operation of the ARR-2:
>
> So, with the ARR-2 even the pilot of a single seat aircraft was given the ability to switch the received ZB modulation frequency, which was changed by a set schedule as well as the sensitivity of the set.  He also could adjust the "Tone," which I assume was done with a BFO?  Except that I do not recall that the ARR-2 had a BFO, so perhaps it was purely an audio tone.

There is a BFO in the receiver.  Beyond that, the label on the square 
knob on the *C-2/ARR-2 and C-38/ARC-5 control boxes read "Beat Note" and 
"Pitch" respectively, which sorta implies a BFO.

> Finally, the manual shows a view of the radio controls in the cockpit, including a a tube mounted along the longitudal axis of the aircraft fuselage, and located just above the  radio control boxes, identified as "Navigation Antenna Control."  I have no idea what this could be.  Any ideas?

Not without a more comprehensive description of its appearance...