{Collins} Re: reading capacitor codes on trimmer caps



Hi John.  The "N750" refers to the capacitors temperature coefficient.  I
forget exactly what the 750 means, but if I remember correctly,  it means
that the capacitance value will go down ( N = negative)  by 750 parts per
million per degree centigrade.   Some of you sharp train drivers can check
me on that.  The same value "N1500" cap for example, will move twice as far
for the same temperature change.  If you've ever been inside a Collins PTO,
you'll see a unique combination of various coefficients and values hand
picked to compensate for drift factors of the other components, with the
obvious goal of "ZERO" frequency  drift with changing temperature.

73' Charlie k3ICH


----- Original Message ----- 
From: "john lord" <k4elv@xxxxxxxxxxxxx>
To: <collins@xxxxxxxxxxxxx>
Sent: Monday, 29 September 2003 11:47 PM
Subject: {Collins} reading capacitor codes on trimmer caps


> I need some assistance to interpret what many may consider a rather
primitive question.  I'm working on a 32V2.  All of the trimmer caps have
been damaged.  The coding on each is N750 8-50.  I know the 8-50 is the
capacitance range, but the N750?  Designates what?  I ordered replacements
from SSN.  The codes on their units read either T8-50E, E8-50E or T8-50E.
What does the E and T stand for?  Thanks for any response.  73, Mike  K4ELV
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Sponsored by the Collins Collectors Association http://www.collinsradio.org
Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central





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