[ARC5] Marine Aviation comms Luzon 1945

[Mike Morrow]

There were 14 different RU/GF command sets.

"...pilot could change frequencies on ... the transmitter to the two preset frequencies the coil was set to on the transmitter..."

There has never been a dual-band transmitter coil set for any GF-* transmitter.

I have attached (if the list management software permits) a tabulation that is a complete listing by Navy Type Number for every:

- GF-* and later transmitter
- RU-2 and later receiver
- GF and RU Receiver coil set
- GF Transmitter coil set

The listing contains a cross reference of specific units to specific coil sets, in addition to the frequency coverage of each coil set.  Coil sets for which two frequency ranges are shown are dual band RU-* receiver coil sets.  There are NO dual band GF-* transmitter coil sets.

"...if the ZB was not engaged, the lower receiver frequency could most certainly be used for regular voice or CW communications."

RU-* coil sets used with the ZB cover 540 to 830 kHz.  There is NO GF-* transmitter coil that operates below 2000 kHz.  Additionally, that range of frequencies has never been utilized as a ground-to-air communications frequency in the manner that, for example, 278 kHz was.

Mike / KK5F
-----Original Message-----
From: Michael Hanz <aaf-radio-1 at aafradio.org>
Sent: Sep 28, 2022 9:10 AM
To: ARC-5 List <arc5 at mailman.qth.net>, milsurplus at mailman.qth.net <Milsurplus at mailman.QTH.net>
Subject: Re: [ARC5] Marine Aviation comms Luzon 1945

I spent some time in three different RU/GF manuals trying to understand the opinion expressed below in blue, and could not find a single reference to two preset transmitter coil positions on any of the GF TX coil sets, nor any switch identified to accomplish such a capability.  Such switches were installed in dual frequency receiver coil boxes, but not in the transmitter coil boxes.  Changing frequency with the set isn't a trivial proposition, even if approximate settings have been penciled on the data plate for a given coil box, as shown in the instructions:



I think we all would appreciate clarification with a bit more detail. 

- Mike   KC4TOS 

On 9/27/2022 2:27 PM, MARK DORNEY via ARC5 wrote:
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 &ldquo; coffee grinder&rdquo; 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


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20221005/03d67e83/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 122286 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20221005/03d67e83/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: RU-GF Receivers-Transmitters-Coil Sets-Complete List 20220929.pdf
Type: application/pdf
Size: 189184 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20221005/03d67e83/attachment-0001.pdf>