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I also have an AADE L/C meter. Mostly it works fine, but some
caveats:<br>
<br>
(1) Always run with a fresh 9V battery. When the battery is low,
the readings get screwy.<br>
(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. <br>
(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<br>
<br>
I've found this meter to be the most accurate when measuring small
values of L and C, bang-for-the buck wise. <br>
<br>
Chris, KL7DM<br>
<br>
<div class="moz-cite-prefix">On 3/7/2018 2:51 PM, Doug & Kathy
Davies wrote:<br>
</div>
<blockquote
cite="mid:CADrcw9mQfYNAcdVzNDuOqYxZVO8GREoM=pv3O1dMgBq1P7rRng@mail.gmail.com"
type="cite">
<div dir="ltr">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.
<div><br>
</div>
<div>The coils are for the low pass filter in a Heathkit DX-60B
transmitter. The schematic can be viewed here: <a
moz-do-not-send="true"
href="https://www.vintage-radio.info/heathkit/"><a class="moz-txt-link-freetext" href="https://www.vintage-radio.info/heathkit/">https://www.vintage-radio.info/heathkit/</a></a><br>
<div><br>
</div>
<div>Doug</div>
<div>VE7DRF</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Mar 7, 2018 at 9:38 AM, Doug
& Kathy Davies <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:dkdavies3@gmail.com"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:dkdavies3@gmail.com">dkdavies3@gmail.com</a></a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">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. <span
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span>I
also measured the other coils and they too were not even
close to the manual values.<span> </span></span>
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?
<div><br>
</div>
<div>Doug</div>
<div>VE7DRF</div>
</div>
</blockquote>
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</pre>
</blockquote>
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