Fw: [Boatanchors] HeathKit QM-1 calibration question

Wed, 17 Mar 2004 18:06:04 +0100

Hi Mike,
yes I have received some replies and I have found a web page where are
published info on how to build a standardized coil
(http://home.online.no/~la8ak/m1.htm).

I don't need an absolute accuracy: just a comparative indication is quite
enough for me.

Thank you for your reply and have a nice day,
** Luca Rossi **
[email protected]
http://www.geocities.com/chopin.i/

----- Original Message -----
From: Mike
To: Luca Rossi
Sent: Wednesday, March 17, 2004 3:29 AM
Subject: Re: [Boatanchors] HeathKit QM-1 calibration question

Did anyone get back to you on this?
Can help with a spec sheet and drawing (Heath) on the item.
I used a 1% standard from my junk box to set it up. Not the same
as provided by the QM 1 though.  Believe it should be 100 uh
value from memory and it's a PI Wound nightmare to replicate.
Mike
Iowa

Luca Rossi wrote:

> Hi to all,
> I am a, potentially happy, new owner of an Heath Q-meter mod.QM1.
>
> Looking at the manual (another gift of BAMA) I have seen that I need a
> reference inductor to do a correct calibration.
>
> So, after years of desuetude and now a circuit refurbishment, I will need
> something like that.
>
> I am looking for someone that has or has had a QM1 or knows well how it
> works.
>
> #1 approximatively, what is the inductance value, wire section and support
> diameter of an original test coil?
> #2 how can I reproduce a test coil of known Q and distribuited capacity
with
> the only aid of a signal generator, a rcl meter and an oscilloscope?
>
> Best regards from Italy,
> ** Luca Rossi **
> [email protected]
> http://www.geocities.com/chopin.i/
>
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