[Test-Equipment] HP-606A Calibration question

[Carl]

----- Original Message ----- 
From: "Barry" <n4buq at knology.net>
To: <test-equipment at mailman.qth.net>
Sent: Tuesday, May 26, 2009 5:48 PM
Subject: Re: [Test-Equipment] HP-606A Calibration question


>> My experience has been different than Carls. While the
>> dials don't loosen up they are sometimes mis-set by careless
>> repair people.
>> The frequency calibration should come in to no worse
>> than half the spec, it is very good all over. The error is
>> determined by the characteristics of the tuning caps, they
>> are pretty accurate although I have some vague memory that
>> there were some bad ones. I have no idea of how the stators
>> on my generator got tilted, it would have taken a lot of
>> force, enough to damage a lot of other stuff and there was
>> no sign of that. Whoever bent the plates evidently didn't
>> realize that the stators were off or didn't know how to fix
>> that.
>> You should be able to get the calibration right on the
>> nose on one of the low bands and have it correct on all
>> bands once the L and C are done. Again, once the shield
>> cover is replaced the high end will need to be touched up.
>> Evidently the amount of disturbance to the amplifer is
>> little enough so it doesn't need touching up.
>> The dial slipping procedure is not in the manual, I
>> learned it at -hp-, it works. BTW, if you ever run across a
>> 608C/D they can also be brought exactly on the money. Both
>> generators were designed by Art Fong who was one of the
>> great designers at -hp- in the old days.
>> You are unblocked from my e-mail..
>>
>> --
>> Richard Knoppow
>
> Something occurred to me about all of this.  Is it possible there is a 
> proper starting position for the trimmer so as to effect the
> final position of the slug?  In other words, there might be almost any 
> number of combinations of L and C that would cause the endpoints
> to be on target, but certain combinations cause the accuracy across the 
> entire dial to be further off than others?
>
> Barry - N4BUQ

Not that Ive experienced Barry. With seperate LC for each band any non 
linearity is repeatable in the same percentage.

Getting the right overshoot at the high end takes a little time/experience 
but its the same as any radio that requires it. At least youre not trying to 
track 3-4 stages.

My favorites are the National HRO's that someone else got into the plug in 
coil sets. I get quite a few of all those models in here for restoration and 
use the same models of equipment I used in the Service Dept 1963-69. Some is 
the exact same item complete with inventory tags that I bought at their 
auction.

Carl
KM1H


>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html