[ARC5] More ZB

[jmfranke]

Yes, the ARR-2 did have a BFO.

John  WA4WDL

--------------------------------------------------
From: "Robert  Eleazer" <releazer at earthlink.net>
Sent: Saturday, July 09, 2011 12:37 PM
To: <arc5 at mailman.qth.net>
Subject: [ARC5] More ZB

> 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:
>
> 1.  Turn the ARR-2 on by switching the Voice-Nav switch on the NAVIG panel 
> to NAV.
> 2.  Turn CHAN SEL indicator to the channel desired of the 6 channels 
> available.
> 3.  Turn SENS knob clockwise to obtain comfortable volume level.
> 4.  Vary pitch or beat note by turning PITCH knob to a comfortable 
> frequency.
>
> 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.
>
> The frequency of the ARR-2 is given in the manual as 234 to 258 MC, so 
> they were not taking great pains to hide it, despite the deliberately 
> mismarked receiver dials and the fact that the pilot could not change the 
> frequency.
>
> Also, I find it curious that the APX-1 IFF gear had the usual destruct 
> charges but that the ARR-2 did not.  They must not have been too worrried 
> about the enemy finding out about the ZB system.
>
> 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?
>
> Wayne
> WB5WSV
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