[MRCA] U-229 & saliva lubrication

[Rich Arland]

OK, well I just rechecked the schematic and it is for the "A" version with
the U-183/U AF connector on the front of the TRC-77A. I thought that it was
weird that all five pins were common with the hot side of the audio. I wired
up the U-229 with the two stereo pins (tip and ring) going to two random
pins on the U-183 U. The shield went to the case of the U-229. I was
wondering if the there was a problem on the connector if I didn't cinch
things down tight enuff. I LOVE MilCom electronics.

Hw are thingsw going?

73

Rich K7SZ
----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <mrca at mailman.qth.net>
Sent: Wednesday, February 01, 2006 11:54 PM
Subject: Re: [MRCA] U-229 & saliva lubrication


> Rich,
>
> The U-229/U will not plug up if the internal O-ring is dry.  I sold a
> connector to another list member who reported back that it was defective.
So I
> gathered up the remaining ones that I had and a junction box with a
U-183/U on it
> and none of them would couple up either.  Took one apart and discovered it
> worked fine with the O-ring removed.  Finally had one of those Duh!
moments and
> got out the OD tube of special purpose underwater mine O-ring grease and
that
> fixed the problem.
>
> On the wiring of the U-183 itself, I don't have the -35 but I can't
believe
> that all five contacts are tied together, nor that the other half of the
> circuit is the outer shell. Perhaps you are looking at the schematic of
the RT-654
> rather than that of the RT-654A.  The former has a JK-34-A (standard 1/4"
phone
> jack for PL-55 plug) for audio out.  Standard wiring to the U-183/U would
be
> Ground to A and Receive Audio to B.  E may or may not be tied to the key
line.
>
> In a message dated 2/1/2006 10:21:23 PM Central Standard Time,
> richard.arland at verizon.net writes:
> > Thanks guys! Great idea. However, I think I'll stick with the silicone.
Any
> > particular brand? How about using something like Lubriplate (tm) which
is
> > silicone based and I happen to have that stuff on hand?
> >
> > I,  like Philip, KA4KOE, thought that the U-229 would be much easier to
plug
> > up to my TRC-77A's audio output jack than it is. Initally I was hesitant
to
> > try any type of lubricant since I didn't know how it would affect the
> > opreation of the rig or if it would possibly degrade or ruin the
connector
> > itself.
> >
> > Incidentally, I have a couple of spare U-229s and want to make an audio
> > patch cord using one of them to interface my W3NQN passive AF filter to
the
> > 77A. Having constructed a 6 ft AF patch cord with a 1/8" (3.5 mm) stereo
> > jack on one end and the U-229 on the other I get no audio from the radio
at
> > all after hooking it up to the rig!. The schematic from the TM
> > 11-5820-473-35, Figure: 7-6 (fold out schematic of the rig) indicates
all
> > five pins on the U-183/U audio jack on the front of the TRC-77A are tied
> > together and are "hot" with receiver audio, with the grou nd side of the
AF
> > circuit going to the shell of the audio jack.
> >
> > After afixint the U-229 plug to the patch cord, I reassembled the U-229
> > according to specs. The U-183/U jack and U-229 plug mate together like
> > normal, however, I get no audio when I attach a set of Sony Noise
Cancelling
> > headset 68 ohms, not 600) to the end of the patch cord; not even any low
> > level audio. There is no audio getting thru the filter to the headset
when I
> > place the NQN AF filter in series between the rig and the headset. Am I
> > doing something terribly wrong? Continuity checks done on the AF patch
cord
> > shows that there are no shorts bewteen any of the pins on the U-229 and
the
> > shell of the connector. I am beginning to think that the schematic is
drawn
> > incorrectly, OR Depot Level maintenance rewired the U-183/U jack to
comply
> > with a modification and neglected to document the change in the TM.
> >
>
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> MVPA 9480
> <wa5cab at cs.com> (Primary email)
> <wa5cab at houston.rr.com> (Backup email)
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