[Milsurplus] YE - YG considerations

[WA5CAB at cs.com]

Hue,

The overload problem could be a problem for a single seat aircraft.  In an 
aircraft with a radio operator, he would just turn down the receiver RF 
gain.

Aboard a ship, there are two bearing types, relative and true.  Relative 
depends upon which direction the ship is headed .  The YG antenna rotator was 
synced with the ship's stable element so that when the antenna was pointed 
toward the north pole (true north), the transmitter would send the code for 
South (the direction that an aircraft receiving it would need to fly to get 
back to the carrier.  This is all independent of the ship's heading, so if 
the ship did a tight 360 degree circle, the code received by the aircraft 
coming in from the north would never change.

On another subject, does anyone know what RPM the YG antenna rotated at?

In a message dated 11/12/2015 17:29:00 PM Central Standard Time, 
kargo_cult at msn.com writes: 
> I didn't know this about the YE/YG  :
> 
> "However, as range for the YE/YG decreases, the ZB equipment in the 
> aircraft 
> will begin to pick up letters in adjacent sectors, but they will be weaker 
> 
> than the
> correct sector letter. At close ranges, as many as two letters on either 
> side of the correct sector may be distinguished."  ( OPNAV 34-P-0800 )
> 
> What does it mean when this says the YE "is synchronized with a gyro 
> compass 
> so that each letter is beamed from the ship on a true bearing" ?
> I am missing what is "true bearing" ?   The ship's not travelling that 
> fast 
> that the plane can't follow the beam.
> 
> The manual also mentions YJ, "a radar beacon which is operated by certain 
> types of airborne radar", and YM similar operation but higher frequency .
> I hadn't heard of these two systems before.
> 
> I also wonder how far apart they ran these transmitters in the 234-258 MHz 
> 
> band. Where more than one was going at a time, like radar picket 
> destroyers 
> with YG.
> -Hue Miller

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