[GreenKeys] Emailing: MVC-002F, MAVICA, MVC-001F, MVC-001F.411

[Nick England]

Yeah - same schematic for the later Navy patch panels - in the later ones,
the jacks are all mounted on bakelite so the jack shell (plug sleeve)
doesn't matter - it isn't connected to anything. I haven't looked at a TT-23
up close and personal but surely the jacks are insulated from the
chassis???? Otherwise all kinds of loop-de-loop stuff could happen.

BTW your Fig 2.2 says dummy plug OR patch cord so presumably the Navy
supplied TS-only patchcords too.

I'm gonna go out on a limb here and claim the Navy had great foresight in
designing patch panels that would work with whatever kind of plugs and
patchcords you had on hand - using either TR of a TRS plug or TS of a TS
plug.
cheers,
Nick
www.virhistory.com/navy 


-----Original Message-----
From: Larry Tighe [mailto:larryradio at worldnet.att.net] 
Sent: Tuesday, February 17, 2009 2:20 PM
To: Nick England; greenkeys at mailman.qth.net
Subject: Re: Emailing: MVC-002F, MAVICA, MVC-001F, MVC-001F.411

Nick et. al.,

There is a serious MILITARY CONFLICT starting here....the Navy shows on 
fig.2-1 of the T-23 patch field TRS on the looping jacks.  Thence, on the 
fig. 2-2 it shows a dummy plug that only has a T & S in a TRS jack.

http://antiquetelephone.com/diagram.pdf

I've posted a link to the offending figs.  They do not show the internal 
connections of the dummy plug.  So, apparently, the dummy sleeve is taking 
the the ring contact to the shell of the jack which would be ground if the 
box is mounted on the ship's wall...err bulkhead.

I'm sticking with the TRS....got lots of 'em.  And, I'm so glad I was army 
aviation...we never had the problems the Navy seems to have! ! ! ! !

lar
----- Original Message ----- 
001F, MVC-001F.411


> ahh, I think I'm catching on - if you plug in a two-conductor TS plug then
> the ring contact on the jack hits the sleeve of course - but using T&S of 
> a
> 3-conductor TRS plus won't work. More confusion - the TT-23B manual's 
> photo
> does indeed show PJ-55B two-conductor TS plugs. I can't tell about the 
> CC-66
> patch cords that came with it. Anyway, doesn't matter and I think you are
> right about using TRS plugs.
> thanks fer the info
> Nick K4NYW