[Heath] Inductor Values

[ChrisIwata]

I also have an AADE L/C meter.  Mostly it works fine, but some caveats:

(1) Always run with a fresh 9V battery.  When the battery is low, the 
readings get screwy.
(2) Short leads are a must.  Lay the component on the bottom side of the 
case if you must:  For whatever reason if you  place the component over 
the LCD part of the meter, the reading is changed. Bear in mind that the 
leads become part of the component measurement.
(3) Always zero the meter before making measurements.  For an inductor, 
a short piece of bare wire directly between the binding posts is the 
right method

I've found this meter to be the most accurate when measuring small 
values of L and C, bang-for-the buck wise.

Chris, KL7DM

On 3/7/2018 2:51 PM, Doug & Kathy Davies wrote:
> I ran the numbers through an on-line inductance calculator using the 
> stock Heathkit coils.  They all came out exactly what the manual 
> values said they should be.  I then wound a few turns of enameled wire 
> on the form I have and, after playing with the turns, I achieved a 
> value of 0.318 uH.  The manual value is 0.320 uH so I think I'm good 
> to go with those I wound.  Looks like I won't be relying on the AADE 
> L/C meter.
>
> The coils are for the low pass filter in a Heathkit DX-60B 
> transmitter.  The schematic can be viewed here: 
> https://www.vintage-radio.info/heathkit/
>
> Doug
> VE7DRF
>
> On Wed, Mar 7, 2018 at 9:38 AM, Doug & Kathy Davies 
> <dkdavies3 at gmail.com <mailto:dkdavies3 at gmail.com>> wrote:
>
>     I'm in the process of completing a previously partially built
>     Heathkit DX-60B transmitter.  Yesterday, I was assembling the
>     low-pass filter and found that two of the coil were missing. 
>     Figuring I could wind my own, I got some enameled wire and wound a
>     bunch on a form that looked to be close to the right diameter.  I
>     measured the value with my AADE L/C meter and finding that it was
>     too high, started to remove turns until I got to the correct value
>     which was 0.32 uh in this case.  Just for grins, I put the meter
>     on one of the kit-supplied "green marked" coils that was,
>     according to the manual, supposed to be 0.44uh.  It measured
>     0.098uh. Since there are two of these, I measured the other one
>     and it' value was 0.094uh. I also measured the other coils and
>     they too were not even close to the manual values.Now this has me
>     puzzled.  Why would Heath put coils in the kit that are way out of
>     spec. or, does it really matter for this application?
>
>     Doug
>     VE7DRF
>
>
>
>
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