Re: [ARC5] tuning knobs (and local controls)

[jcoward5452 at aol.com]

Robert,
  Both versions have only positions 1 and 6 connected.(I did not open 
them,just ohmed them out).The two solid body ones I have on the 
aluminum finished FT-227-A rack with BC-454 and BC-455 and the black 
disk ones are on the black wrinkle MT-63/ARC-5 rack with R-26 and 
R-27.All four receivers have local controls but I'm not sure if they 
are all politically correct for their series unless I get the tools 
out!They do look pretty good though.All work fine except no BFO on the 
BC-454.Have not had the time to get into it but suspect the usual 
suspects.
 Happy New Year to you and yours!
 Jay


-----Original Message-----
From: WA5CAB at cs.com
To: jcoward5452 at aol.com
Sent: Thu, 1 Jan 2009 4:37 pm
Subject: Re: [ARC5]  tuning knobs (and local controls)



My guess would be that the PL-192 with the phenolic disk was made from 
the -A
suffix plug shell while they were making tooling to make the closed 
back
blanking plug.  The GF/RU has several different blanking plugs.  And 
most if not
all) are stamped on the rear (not the side) with a four-digit A.R.C. 
number.  A
few are stamped with the 2- or 3-digit number of the plug they 
substitute for.

I have over the years seen receiver racks with a short jumper between 
two pins
in one or more of the 8-pin chassis plugs.  I can't recall which pins 
or which
plug.  The jumpers were made from two hollow rivets set into
 two ring 
lugs with
a short piece of solid wire connecting the lugs.  Grease was squirted 
into the
plug and one of the black plastic caps covered it.

Jay, do your two plugs have one jumper or two?

jcoward5452 at aol.com wrote:

>  I have two different PL-192's . One has a completely enclosed metal
>shell and the other has a solid phenolic disk where a wire loom disk
>would ordinarily be for a PL-152-A.The solid shell has PL-192 stamped
>into the end of the shell,the phenolic disk one has PL-192 stamped 
into
>the shell side like the -152 and also has PL-192  stamped onto the 
disk
>in white ink. (BTW,they are also from A.J.Link).
>  As for local controls,I have two versions of FT-260-*. The odd one 
has
>a toggle switch in place of the 3 positin rotary.The stamped
>nomenclature on the housing is scratched out.The labeling of the 
switch
>positions looks facktory and the tip of the toggle has the little glow
>bead.Not a ham job at all.Could have been an upgrade for high altitude
>gloves?
> Jay KE6PPF
>
>
>-----Original Message-----
>From: Mike Morrow <kk5f at earthlink.net>
>To: arc5 at mailman.qth.net
>Sent: Wed, 31 Dec 2008 9:51 am
>Subject: Re: [ARC5] tuning knobs (and local controls)
>
>
>
>Jack wrote:
>
>>Another rare item for a locally controlled receiver is the
>>PL-192 plug for the receiver rack. This is a jumper plug for
>>the receiver rack that completes the +28 volt supply line
 for
>>on-off switching. There is an MX-something equivalent for the
>>AN/ARC-5 as well...
>
>Excellent point!  How could I have forgotten that?  The wired
>plug for the SCR-274-N is indeed rare.  In all my years, I've
>come across just one PL-192, and I got that from A.J. Link.
>
>These local control plugs make up the LV power connection from
>pin 1 to 6 on the back top of receiver rack, which normally would
>be made up at the remote control box.
>
>The official AN/ARC-5 equivalent is the "A.R.C. 6787 Wired Plug".
>I've never seen one.  Another plug which could be used is the
>MX-2/ARR-2 that Jack refers to.  It is wired like the A.R.C. 6787,
>plus it has a connection between pins 2 and 8 to connect receiver
>audio output to audio bus A.  This was required for AN/ARR-2
>installations using the early MT-7/ARR-2 single receiver rack,
>which does NOT have an audio bus A / bus B select switch.  (That
>was later added to the MT-7A.)  There are a lot of MX-2/ARR-2 plugs
>around because they were used every place that the AN/ARR-2 was
>was installed.  Since all AN/ARR-2 and AN/ARC-5 racks other than
>the old MT-7 have audio bus switches on the rack, the AN/ARC-5
>manuals say that the connection between pin 2 and 8 should be
>lifted on the MX-2.  Thus it becomes electrically identical to
>the A.R.C. 6787.
>
>Mike / KK5F
>
>
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