[Collins] INFO PLEASE

[Bob McGraw - K4TAX]

One approach that I've used is to connect my sinewave audio generator set at 
60 Hz to a winding, adjust the level for 1 volt RMS generator output and 
then read the voltage on the other windings.  Makes for easy calculations 
and takes a lot of guess work out of figuring a transformer turns ratio. 
Also keeps the "unknown" voltage on the windings from biting too much should 
you accidentally get across them.


73
Bob, K4TAX
Sparta, TN
----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
To: <collins at mailman.qth.net>
Sent: Thursday, June 18, 2009 1:27 PM
Subject: Re: [Collins] INFO PLEASE


> On Thu, 2009-06-18 at 07:14 -0400, Gary wrote:
>> I have acquired a few transformers and chokes with Collins numbers on 
>> them. A search of the internet turned up nothing. Is there any Collins 
>> members that mite be able to help. The following numbers 
>> are...............
>> 668-0199-010
>> 664-0124-030
>> 668-0200-010
>> These were made by "BASLER ELECTRIC" for Collins.
>> Regards,
>> Gary
>
> I wish I had  a room full of aperture cards holding microfiche. Then I
> could answer that question. They aren't for S-line that I can see. If
> they have wire leads they can be tested and the power rating guesses.
> Black and maybe black/white are usually primaries. Green is usually 6.3
> volt heater, green/yellow for center tap. Red for high voltage,
> red/yellow for center tap. Brown for 5 volt filament, brown/yellow or
> some other combination for center tap. I like to apply 12 volts AC to
> the primary, then I don't have 300 volts flopping around while I'm
> checking the secondary voltages. Then with voltages and core size in
> hand, I go look at a Stancor catalog to see what had about the same
> voltages and core size and I can have a good idea of the rating.
>
> Chokes are tougher, they tend to change inductance with current, but
> there too, absent the amount of inductance swing (that's affected by the
> air gap) comparing inductance, size, and resistance often gives a ball
> park idea of value.
>
> The 668 are chokes, the 664 a transformer. The dash numbers tell me
> probably at least 1963 or later specifications.
>
> It might be worth calling Basler, though they may not admit having made
> them. Last I knew Basler was in western Illinois in a small town.
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
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