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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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