<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 href="https://www.vintage-radio.info/heathkit/">https://www.vintage-radio.info/heathkit/</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 href="mailto:dkdavies3@gmail.com" target="_blank">dkdavies3@gmail.com</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>
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