[Milsurplus] Y YJ 1945 ?

[Hubert Miller]

YJ and YH are “long-wave racons” listed under “Navigation Sets” in the “U.S. RadarOperational Characteristics of Radar

Classified by Tactical Application FTP 217” Not radar but radar adjuncts, you might say. If i called the YH-YJ radars,

my mistake. The text says that YJ can be interrogated by ASB as well as some SCR-set. 

 

My comment was largely that i thought ASBs had all been retired when the microwave radar was viable. I see listed numerous Pacific sites,

ca. 1945, with only YJ racons. Hence my surprise. 

The beacons are lumped with the radars in the Navy discussion as they are, most of them, interrogated by radars. In the radio charts, they are

called “Racons”. YG is a separate animal and is identified on the charts as “Beacon”, as compared to “Racon”.  AN-PPN-1 is clearly a beacon, 

interrogated by a radioaltimeter. I suppose that is a kind of radar in that it measures reflected radio pulses.

 

I believe most Japanese radars operated around 187 MHz but i’m just going on sketchy memory here. Even if they did have magnetrons,

from what i have seen of the aircraft radar photos, i think it was all below even US ASB radar freqs, so there really was no chance of 

Japanese spoofing or using US racons. 

 

As i look thru the list, i sure wish Henry Engstrom was still with us. I really would have liked to have compiled a list of the Pacific AFRS

broadcast stations for him. And i found some other document that talks about the programming of the stations. 

 

Here’s another ( i think ) interesting thing. A time & frequency standard station in Australia, with the call letters WTO, frequencies 5,10,

15 MHz, transmitting 5 minutes of the hour only, and only 4 times a day.

-H 

 

From: WA5CAB at cs.com [mailto:WA5CAB at cs.com] 

Sent: Friday, August 19, 2016 11:32 PM

To: kargo_cult at msn.com

Subject: Re: [Milsurplus] Y YJ 1945 ?

 

Actual radar went to shorter wavelengths due to increased resolution and decreased antenna size.  Calling either the YG/YH and the associated aircraft end, or the AN/PPN-1 and AN/APN-2 "radar" is stretching the term seriously.  The middle "P" in the AN nomenclature system means "Pulsed" and doesn't necessarily imply search or fire control capabilities or high frequencies.  You can "pulse" any frequency.

 

Robert &Susan Downs - Houston

wa5cab dot com (Web Store)

MVPA 9480

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