Fw: Re: [Test-Equipment] Q-Meter Certifiable Calibration it isn't but......

Sun, 17 Mar 2002 10:13:13 -0600

There is no problem shipping to Norway .....an envelope is an
envelope ....just costs a few cents more.

I can give you some detail if you like using an Amidon core as
an example. I would think the "Q" will vary some with "doping" 
material used to hold the turns in place, wire spacing around 
the core, and consistency of the core material itself (maybe 
other factors). I bring up the last point because these Amidon 
"yellow" cores appear to be operational at a lower range than 
their charts indicate even thought they mention that larger cores 
tend to peak towards to low end of the range.

Amidon T-50-6 core, Permeability 8, Freq range 10-50Mhz, 
color - yellow

Winding - 23 turns of #22 wire
Spacing - equally spaced around toroid 
Doping - none
Inductance - 2.5uH

Results:  Frequency (Mhz)    Capacitance (pf)    "Q"
                    7.9                                150              
340
                    8.5                                134              
350
                    9.0                                119.4           
355 
                  10.0                                  94              
355
                  15.0                                  41.5           
340
                  18.0                                  28.5           
296
                  19.2                                  25              
284                       

73s  Kees K5BCQ

--------- Forwarded message ----------
From: "J M Noeding" <[email protected]>
To: <[email protected]>
Date: Sun, 17 Mar 2002 14:13:50 +0100
Subject: Re: [Test-Equipment] Q-Meter  Certifiable Calibration it isn't
but......
Message-ID: <002f01c1cdb5$fde80320$607d4382@hal>
References: <[email protected]>

Perhaps not possible to ship to Norway, but you could perhaps give some
description of the coils. Wouldn't it be an idea to wind such coils on
readily available Amidon cores with standard wire size, so it is easy to
duplicate? I use a Radiometer Q-meter, also have a Heath Kit QM-1

73,
Jan_Martin
LA8AK, 
N4623-Kristiansand (tel.: +47-380-87178)

----- Original Message ----- 
From: "Sandy and Kees Talen" <[email protected]>
To: <[email protected]>
Sent: Friday, March 15, 2002 1:43 AM
Subject: [Test-Equipment] Q-Meter Certifiable Calibration it isn't
but......

> I don't own any of the Boonton calibration standards, in fact I've
> never seen one. However, I would like some level of accuracy
> with my Boonton 260A.
> 
> Recently Paul Monroe volunteered to test some toroids on a 
> calibrated HP4342A Q meter (undoubtenly more accurate than 
> my old Boonton 260A).  As soon as I can correlate the data with 
> my machine (initial info looks like it reads about 20-30% low) I'll
> make those available to others (on loan) for a rough calibration 
> of their Q meters .......better than assuming/guessing. 
> 
> Send me your name if you would like to borrow them, I'll make a 
> list, and forward that around with a couple of toroids. Just keep
> them a few days and send to the next person on the list.
> 
> May work, may not, we'll see.
> 
> 73s  Kees K5BCQ
> _______________________________________________
> Test-Equipment mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/test-equipment
> 
> 

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