[Heath] IG -57A schematic received

[Donley]

Ken,

I am intrigued by your stated project - 'a "high-performance" crystal tester 
and evaluator'. I have been searching for the ultimate, all-encompassing, 
all-frequency crystal tester. I would appreciate any information you could 
share on this project. Most testers that I have found have holes in the 
frequency ranges that they test.

73
Richard
kc9ub




----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: <Heath at puck.nether.net>
Sent: Monday, March 19, 2012 11:59 AM
Subject: [Heath] IG -57A schematic received


> Thanks, ALL of you who sent me the necessary information.
>
> I bought the IG-57A off eBay for very little cost, since I needed the
> case/cabinet for another project.
>
> However, when I received the unit and removed the rather grundgy top and
> bottom covers, I was very thoroughly amazed at the incredibly careful
> construction. In all the years I have been dealing with Heathkits, I have 
> never
> seen such very high-quality work!
>
> At first, I thought it was a factory-built job, but on closer inspection, 
> it became
> very obvious that the original owner was the builder.
>
> ALL wiring was laid out at right-angles, long runs were carefully laced, 
> all
> solder joints were perfectly done, and the flux residue had been carefully
> cleaned off, probably with alcohol. There was not one single loose screw 
> or
> no-solder joint in the entire unit. Leads from coaxes were at the absolute
> minimum, etc. And the original owner/builder had scratched his information
> in the top of the sweep-generator housing.
>
> I was amazed!
>
> Although such a unit has absolutely no use in my shop, I was very 
> reluctant
> to take it apart until I had determined that there was nothing in it I 
> could use
> for my next project, a "high-performance" crystal tester and evaluator.
>
> From the schematic, it became obvious that I could use the internal power
> supplies, the DC amplifier, and possibly the sweep generator.
>
> Although the sweep-generator does not, in its present configuration, cover
> the frequency ranges I need for my favorite method for aligning receivers,
> the so-called "visual" method, it appears that it can be modified to do 
> so, so I
> have very carefully dismantled and saved all the parts necessary for that.
>
> Again, I thank everyone who sent me the necessary information.
>
> vy 73,
>
> Ken Gordon W7EKB
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