[R-390] Help part numbers

[Roger Ruszkowski]

Tage Flemming,

Extender cable use is mentioned in the manuals.
You can set an R390 or R390A up on end swing any one deck out and plug the deck in.
This has been the way it is done since day one.
Some wood blocks help this activity along.
Recommended as you drop the front panel.
You may have to unbolt the wire harness from the frame to let the front panel be dropped.
The wire harness needs some extra slack.

Save your self the effort and do not build these extender cables just because.
 
Some Fellows doing VFO rebuild and testing have made up the cable
to operate the VFO in a jig to allow the exact 10 turn alignment.
The VFO is dialed 10 turns with an indicator better than eye ball.

If you need help with other problems let us know.
But I am trying to save you from your self.
I am sorry those bad books still exist to miss lead us.

The US Army trained me in 68 to maintain these receivers.
I made a career of that for 8 years until 75.
And I have been talking about the receivers and writing about maintaining these receiver and own a few and still listen to them every since.
Please believe you will not need extended cables to maintain and repair the receiver.

A signal generator, A DC volt meter, An AC volt meter and 600 ohm 1 watt resistor (2 ea 1200 1/2 watt in parallel) is all you need for
equipment. A magic spline wrench, a tweaker, nut driver for filter cover in IF deck, and long Philips screw driver are the only tools you need.

More tools are better. calibrated signal generator, freq counter, tube extenders, AC meter with scale in DB. all help things along.
But are not required.

There is an inspection check list at R390.net, I am only the last editor of the list.
I was taught the inspection sequence.
I was developed long before I ever seen an R390.
It has worked ever time I have applied it.

I use to work six day weeks and gave two of these receivers my full attention for an 8 hour work shift. each day.
In six months I start the process all over.

A good Saturday 8 hours once a year. Give your receiver a bath, tube test, alignment and noise level mitigation.
Swap the tubes around for the very best signal to noise ratio you can get with the parts at hand. A morning in the yard
a lunch hour drying in the sun as you do the chores for the day. A 4 hour evening doing the alignment.

Between 500 KHz and 32 MHz the receivers sensitivity exceeded atmospheric noise levels.
The limits for the receivers is the antenna.
If the signal can be heard the receivers will hear the signal.

Welcome to the R390 Fellows.

Roger Ruszkowski  33C4H 68-75 AI4NI and now an old timer

 
 
-----Original Message-----
From: Flemming Tage Kirsby <flemming.kirsby at mail.dk>
To: r-390 <r-390 at mailman.qth.net>
Sent: Thu, May 26, 2016 6:54 pm
Subject: [R-390] Help part numbers

Help!

I'm missing the part numbers on the connectors used to create
Multi-Conductor Test Cables for bench testing the Collins R-390A /UUR radio
receiver.

Plug P108 and Jack J208, Plug P109 and Jack J709, Plug P110 and Jack J410,
Plug P111 and Jack J811, Plug P112 and Jack J512, Plug P119 and Jack 619 and
Plug P120 and Jack J620.

Ore anyone knows manufactor name and number?

 

Best regards

Flemming OU1FTK

 

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