[TMC] [R-390] CV591 power connector

[nryan at mchsi.com]

Hi, Nick,

Thanks for that tip on ground connection for MS series.  I've noticed that the three wire connection varies from one type of equipment to another.

Is there a standard hook-up convention for the other terminals, A and C?  (Neutral and hot wires?)  If not, it would be helpful to adopt a standard so one can switch power cords among other units, be they CV-591, R-1051*, etc., without worry.  Perhaps our group can work out a standard.

I suspect, but do not know for sure, that when the the R-1051 series receivers came along, the Navy had their power connectors identically wired.  (Any R-1051* mavens out there who can confirm this?)  My hunch is that at some time prior, there was no standard connection pattern, but with subsequent wider use of the MS series, some consistency was required.  We might use the R-1051* as our starting point.

Suggestions welcome.

73 from eastern NC,
Norman, KG4SWM

Any activity becomes creative when the doer cares about doing it right, or doing it better. -- John Updike


----- Original Message -----
From: Nick England <navy.radio at gmail.com>
To: Alan Chandler <alanchandler at frontier.com>
Cc: R-390 HF Receiver List <r-390 at mailman.qth.net>, TMC at mailman.qth.net
Sent: Sun, 20 May 2012 15:30:35 -0500 (CDT)
Subject: Re: [R-390] CV591 power connector

Clarification - the 3-wire grounded-type twist-lock female plug will
NOT work in the 2-wire male receptacle.
The 3-wire plug is larger than the 2-wire.

The 2-wire female twist-lock plug should be a NEMA ML-1R (Hubbell
HBL7464V) - the back shell and strain relief don't look like the old
kind, but should be much better. I have not tried these since I still
have enough of the old brown style.

The 3-wire female twist-lock plug should be a NEMA ML-2R (Hubbell
HBL7593 or HBL7593V) - I am NOT sure about that since two Hubbell data
sheets seem to contradict each other!

See http://www.hubbellcatalog.com/wiring/catalogpages/Page-B05.pdf

And a warning - the 3-wire MS connector on earlier CV-591A (TMC MSR)
is wired differently from those on later ones and on all other
military gear I have come across! The standard is ground on pin B, but
TMC didn't do it that way on early CV-591A for some reason. I have
changed all my CV-591A connectors to conform to the standard.

Cheers,
Nick K4NYW

>
> On May 19, 2012, at 10:34 AM, "Alan Chandler" <alanchandler at frontier.com> wrote:
>
>> Hello to the list.
>>
>> I am looking for the small two conductor twist lock power connector used on
>> some of the CV591A SSB converters.  These were also used on some of the
>> older test equipment too.  I have two of the 591A and one uses this twist
>> lock and the other is an MS series.
>>
>> TIA
>>
>> 73, Alan - K6RFK
>>