necessity for shifting coils in the plane. When the planes are 
on the YE frequency we have a hell of a time communicating with 
them. A ready means of orientating the dividing line between any 
two letters-sectors to any desired bearing. This is desirable to 
permit using the dividing line between two sectors as a beam for 
planes to follow to an objective.
 
The next item is a MUST item and we need them pronto. All carriers, 
cruisers, and destroyers must be equipt with TBS equipment immediately. 
One frequency is all that is required (72.5). We have built haywire 
equipment to work our destroyers. The carriers are task force flag-
ships and are constantly the primary targets of enemy submarines and 
aircraft. We must have a direct voice channel for day and night 
emergency maneuvers and warning or radar reporting channels with 
our protecting cruisers and destroyers. Radio silence and limitations 
on visual signalling at night and the normal delays in handling this 
type of traffic preclude the use of other circuits for this purpose.
I cannot too strongly emphasize the necessity for equipping the 
carriers and cruisers with TBS equipment immediately. When can we 
expect ours? CXAM and SC equipped ships need two each- one for the 
radar net and one for maneuvering channel.
 
Based upon my entire experience and most thorough considerations, the 
following are the general specifications for the ultimate aircraft 
radio equipment for all CV or single engined aircraft. Crystal con-
trolled, five channel, quickshift both transmitter and receiver,
25 watts, 3000 to 20000 kcs., built-in ZB circuit with provisions 
for two way voice communication on the ultra high frequency. No 
direction finders and no plug-in-coils, voice and MCW only. Inter-
phone separate from radio. Include IFF circuit if practicable.
The number contracted for after all bugs were worked out would be 
sufficient to provide all small planes in the navy with one model.
I could expound for hours on the advantages of such a set over the 
present equipment and know about all the limitations and arguments 
against crystal control."
 
 
 
                                                                   J. B. Dow,
                                                                  Comdr. U. S, N.