[ARC5] GD-1B coil set - info wanted

[Glen Zook]

Try using this site to calculate the inductance of the coils.

I have used it the "other way around", that is, to get the number of turns, etc., for specific tank circuits.

http://www.daycounter.com/Calculators/Air-Core-Inductor-Calculator.phtml

 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: Al Waschka <awaschka at bellsouth.net>
To: 'Leslie Smith' <vk2bcu at operamail.com>; 'ARC-5 List' <arc5 at mailman.qth.net> 
Sent: Monday, November 21, 2011 8:18 PM
Subject: Re: [ARC5] GD-1B coil set - info wanted
 
OK, here's what I have been able to do.  I have an RLC meter, but even
though it has a 1 uuf scale, it will only measure L larger than 0.1 mh.  It
doesn't appear to be useful to measure these coils as I suspect they are in
the 10s to single digit uH range.  I tried to measure the largest one and
couldn't get a reading.  I was able to measure the resistance of the coil,
but I'm not sure the number was reasonable.

The mechanical data follows.  I have listed the exact measurements from my
caliper, but the tolerances may indicate another answer, e.g. I suspect the
coil form is 3/4".

Coil Form Diameter - 0.74 in.
Coil Pin Diameter - 0.115 in.
Coil Pin Spacing (CL to CL) - 0.75 in.

2-5 MHz Coil - 80.5-85.5 turns, close spaced, 0.636 in. long I'm sure of the
length measurement, but the wire is really fine, so turns are hard to count
and I can't measure the diameter, but 80 turns of #32 should measure 0.635,
so that is close.  This is what I was talking about when I said "LF".  Not
really LF, I guess, but I wasn't talking about the accessory LF coil set.

5-14 MHz Coil - 25.5 turns close spaced, 0.330 in. long, guessing #28, 26
turns should measure 0.329 in.

14-37 MHz Coil - 8.25 turns close wound, 0.202 in long, guessing #22, 8
turns should measure 0.2025 in.

37-100 MHz Coil - 2.25 turns close wound, 0.076 in. long, guessing #20.
Wire measures 0.035 in. in diameter, which is closer to #19, but wire is
enamel covered, stripped and tinned where I can measure it, so I'm going
with #20 at 0.032 in. diameter.

100-250 MHz Hairpin - This "coil" is a U-shaped half turn from spacedpin to
pin.  The length from top to bottom of the "U" is 0.870 inches.

For the half-turn counts, use holes in the coil form above the pins.  For
the 0.25 turn measurements put a hole half-way around from one pin to the
other.

Hope this is clear enough to be helpful.

73,  

Al K5TAN  

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Leslie Smith
Sent: Tuesday, November 15, 2011 4:13 PM
To: ARC-5 List
Subject: [ARC5] GD-1B coil set - info wanted

Hello List-members!
I seek information for coils to suit the Heathkit GD-1B.
(The GD-1B is useful to inject a signal into the R-27 IF line, on
2830kHz)

Can any-one here give me the following information:
(1) Diameter of the coil former.
(2) Number of turns for each of the 5 coils.
(3) Separation (spacing) of the coil pins (the pins that plug into the GDO
body).
(4) Diameter of the coil pins.  (I suspect 1/8 inch or 3.17mm)

If anyone has an RLC meter and can put measure the inductance of the
coils, that info will also be appreciated!  

Thanks you,


  Les Smith
  vk2bcu at operamail.com
  2011-11-16

--
http://www.fastmail.fm - Same, same, but different...

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