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Info/pics on VTAS and ARN-101 needed, please...

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Dazza44
Info/pics on VTAS and ARN-101 needed, please...

Hello everyone, new to the forum and first post, so please be gentle!

I'm looking for good quality pictures of the VTAS kit fitted to the F-4J/N/S, and the ARN-101 cockpit equipment fitted to the F-4E and RF-4C. I always understood that the 'Arnie' mods were only fitted to USAF jets and possibly some Israeli F-4E's but, some recent images I've found of ROKAF F-4E's seem to show the doghouse antenna on the spine, if anyone can help I'd be grateful...

 

Best regards, Daz

ejiran
ARN-101 was an intertial nav

ARN-101 was an intertial nav system, no external antennas.  I don't really remember there being anything in the front seat specifically for the ARN-101.  I think everything was in the back seat.   The only thing the pilot could really do up front was switch between reference inputs on the flight instruments i.e. between INS and ARBCS.

Dazza44
ARN-101 external antenna

ejiran, the ARN-101 did have (at least one) external antenna, as I already mentioned, it was on the spine inbetween the TACAN and UHF antennas, nicknamed or referred to as a 'doghouse' antenna. I would post an image but for some unfathomable reason the forum won't let me post images in the replies to to topics...

-Daz

ejiran
ARN-101 external antenna

Dazza44, I worked on the ARN-101 system on USAF F-4E/Gs, it had no external antennas.  It was an Inertial Navigation System, hence no external radio nav reference signals.  It may be possible that if you think the ROK AF had ARN-101 on their F-4s, that they may have had a GPS interface in later years.  I wouldn't know about that; but I DO know the F-4s I worked on did not have an antenna for ARN-101.

Eric

 

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