SUBMARINEMUSEUMS.ORG Forum

Individual Submarine Boards => USS Cobia (SS-245) => Topic started by: Mark Sarsfield on April 11, 2008, 02:52:54 PM

Title: SJ-1 radar questions
Post by: Mark Sarsfield on April 11, 2008, 02:52:54 PM

A guy on the Subsim.com website is trying to model more realistic SJ radar sets for the Silent Hunter IV game.  He read some material that stated that contacts looked like 5 degree arcs on the scope (due to its accuracy), as opposed to a dot.  Is this true?  Also, he wanted t know if SJ radar had a sweep line or did the operator have to pay attention to the radar bearing indicator?  Finally, did any of the SJ radar sets have a range and/or bearing "odometer"?  I know that the SS radar on the Batfish does.

A follow-up question is how far out do contacts show up on the PPI scope?  I thin the max. range is something like 80,000 yards/46 miles, but do contacts really show up that far out?

Thanks.

Title: Re: SJ-1 radar questions
Post by: K0EFV on April 11, 2008, 06:50:09 PM

Mark
Sorry I cannot answer the quetions.  Tom Aschenbrenner is the only source I go to, and he was in Manitowoc this past week, but a very hard person to get a hold of.  Their are other  vets up there that also can operate it.  I will try to find some place you can go to.  At one time I did operate airborne radar but thar will be no help here.  Also I was the dummy who was supposed to do a nite time radar navigation run up the Mississipi from Memphis and ended up on the Ohio River by mistake Har Har
K0EFV

Title: Re: SJ-1 radar questions
Post by: MWALLEN on April 11, 2008, 07:09:33 PM

Hey Mark S. - have you looked into the ability to raise the SD mast?

Title: Re: SJ-1 radar questions
Post by: Mark Sarsfield on April 12, 2008, 09:30:28 AM

It runs on the same hydraulics as the periscopes.  I even think that all three scopes/masts are built the same.  As far as I can tell, all of the hydraulic lines are metal pipe.  The machinery would probably have to be disassembled to clean it up and we need a 250V rectifier to run the IMO pump motors.  I think access to the SD mast is under the radio room, since it is not in the pump room - the shaft runs right behind the huge transmitter.  I have never been in that particular storage room and I don't know what the condition is.  It would be nice to get that system operational, again.  Obviously, our SD (or SV, more than likely) receiver stack is junk.