[Hallicrafters] Self resonant frequencies of various capacitors

[James Liles]

Hi Carl:
I have the same numbers for the .01 and .001 film caps but the your ceramic 
measurements are vastly higher than I measured.  Would you mind sending the 
.01 and .001 ceramic caps that you measured to me.  Need to determine why 
there is a difference between my measurements and yours; being very close to 
the same with the film and so vastly different for the ceramic caps.  Can I 
convince you to measure the ceramic caps with your HP Q meter?  Thanks for 
your effort but I need to confirm this setup to be accurate or modify it.

Kindest regards Jim K9AXN

--------------- Original message -----------------

Message: 4
Date: Sun, 2 Jan 2011 18:53:02 -0500
From: "Carl" <km1h at jeremy.mv.com>
Subject: [Hallicrafters] Self resonant frequencies of various
capacitors
To: "hallicrafters" <hallicrafters at mailman.qth.net>
Message-ID: <022e01cbaad8$3325bc40$6401a8c0 at DAVES>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

Here is a short list of a few new caps I tested as I was suspicious of a
previous posters results.

Equipment used: Measurements Model 59 GDO, HRO-500, R-7000. The GDO dip was
at the most distance to get a solid dip which is more than close enough for
his test.

Lead lengths ranged .5 to 1" depending on physical cap dimensions.

.001 1000V disc 120 MHz
.001 1000V CDE film 25.2 MHz

.01 500V disc 31.8 MHz
.01 630V Illinois film 11.35 MHz
.01 600V Orange Drop 9.1 MHz

.02 600V disc 10.1 MHz
.022 400V Illinois film 8.25 MHz

.03 600V Orange Drop 6.25 MHz

.05 100V disc 6.8 MHz
.05 100V film 5.6 MHz
.047 600V Orange Drop 3.7 MHz

I'll let others calculate the inductance of each cap.

Somewhere I have a few Black Beauties that show almost no leakage, I'll dip
those when I can find them. There are also a few hundred paper caps, NOS and
pulls, on hand that I use for restuffing; I'll see how a few dip.

Carl
KM1H