[ARC5] Marine Aviation comms Luzon 1945

[MARK DORNEY]

If the aircraft was equipped with the remote switches for the coil bands, the aircraft pilot could change frequencies on bothe the receiver and the transmitter to the two preset frequencies the coil was set to on the transmitter, and the two frequency bands the receiver was set up for ( the receiver could also be fine tuned using the “ coffee grinder” tuner the pilot had available to him. The ZB Homing adapter had to be turned on via the pilots control box in order for the receiver to be used for navigation. If the ZB was not engaged, the lower receiver frequency could most certainly be used for regular voice or CW communications. 

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

> On Sep 27, 2022, at 11:59 AM, Mike Morrow <kk5f at earthlink.net> wrote:
> 
> 
> No.  There are no dual-frequency RU/GF sets.
>  
> There are indeed dual-band RU coil sets, but in every case except two, one band is a communications band and the other is a navigation band.  Examples:
>  
> CBY-47076     400 to   600 kHz for MF reception or homing
>                       3000 to 4525 kHz for GF-* comm. transmitter
> CBY-47107    540 to    830 kHz for ZB-* VHF homing adapter output
>                       3000 to 4525 kHz for GF-* comm. transmitter
>  
> There is NO capability for swapping from one communication frequency to another by simply selecting the alternate band of a dual-band coil set.
>  
> There are NO dual-band GF-* transmitter coil sets, nor any RU/GF set with more than one transmitter or receiver.  (RU-4, -5, -6, -10, -11, -12, -18, -19 liaison receivers included one or two receivers, but never include a GF-* transmitter.  Those RU models were used with GO-* and GP-* liaison transmitters.)
>  
> The only way to cover two channels with an RU/GF set is to have two complete and separate RU/GF installations...which would have been extraordinary if ever it occurred.  That was a significate advance provided by the ARA/ATA, SCR-274-N, and AN/ARC-5 command sets.  Two transmitters in the transmitter rack provided two switch-selectable channels for transmit, and two of the three receivers in the receiver rack provided simulateous reception of those two channels.
>  
> Mike / KK5F
>  
> -----Original Message-----
> From: MARK DORNEY <mkdorney at aol.com>
> Sent: Sep 27, 2022 6:49 AM
> To: Hubert Miller <Kargo_cult at msn.com>
> Cc: ARC-5 List <arc5 at mailman.qth.net>, <Milsurplus at mailman.qth.net>
> Subject: Re: [ARC5] Marine Aviation comms Luzon 1945
> 
>  
> RU/GF set.   Dual frequency transmitter and receiver coils. 
>  
> Mark D. 
> WW2RDO
> 
>  
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