You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

That coil is designed as an "Outbacker" type antenna loading coil. On the lower HF bands it will perform as badly as the antenna it's a copy of.
There are so many 'mis-truths' in that advertisement it's amazing. Taken individually, everything said is in fact true. BUT, as it's presented about this coil, it's either misapplied or out right 'poo-poo' since it doesn't apply at all.
Coils provide no 'gain' at all, that's just silly. They supply inductance and inductive reactance and that's all they can do. How that inductance is applied can certainly affect the performance of the circuit it's used in, and that circuit may 'amplify' something, but the coil it's self is only a part of that, certainly isn't the direct cause of it.
If you weighed that eBay coil, computed what it would be worth if it was copper and gave that price for it, you'd still have been taken to the cleaners.
- 'Doc

(Just for grins, did you know that Henry Allen used to make two versions of screwdriver antennas? One was low, the other high power.)

<blockquote data-quote="W5LZ" data-source="post: 390331" data-attributes="member: 129">That coil is designed as an &quot;Outbacker&quot; type antenna loading coil.&nbsp; On the lower HF bands it will perform as badly as the antenna it&#039;s a copy of.There are so many &#039;mis-truths&#039; in that advertisement it&#039;s amazing.&nbsp; Taken individually, everything said is in fact true.&nbsp; BUT, as it&#039;s presented about this coil, it&#039;s either misapplied or out right &#039;poo-poo&#039; since it doesn&#039;t apply at all.Coils provide no &#039;gain&#039; at all, that&#039;s just silly.&nbsp; They supply inductance and inductive reactance and that&#039;s all they can do.&nbsp; How that inductance is applied can certainly affect the performance of the circuit it&#039;s used in, and that circuit may &#039;amplify&#039; something, but the coil it&#039;s self is only a part of that, certainly isn&#039;t the direct cause of it.If you weighed that eBay coil, computed what it would be worth if it was copper and gave that price for it, you&#039;d still have been taken to the cleaners.&nbsp;- &#039;Doc(Just for grins, did you know that Henry Allen used to make two versions of screwdriver antennas?&nbsp; One was low, the other high power.)</blockquote>

[QUOTE="W5LZ, post: 390331, member: 129"] That coil is designed as an "Outbacker" type antenna loading coil. On the lower HF bands it will perform as badly as the antenna it's a copy of. There are so many 'mis-truths' in that advertisement it's amazing. Taken individually, everything said is in fact true. BUT, as it's presented about this coil, it's either misapplied or out right 'poo-poo' since it doesn't apply at all. Coils provide no 'gain' at all, that's just silly. They supply inductance and inductive reactance and that's all they can do. How that inductance is applied can certainly affect the performance of the circuit it's used in, and that circuit may 'amplify' something, but the coil it's self is only a part of that, certainly isn't the direct cause of it. If you weighed that eBay coil, computed what it would be worth if it was copper and gave that price for it, you'd still have been taken to the cleaners. - 'Doc (Just for grins, did you know that Henry Allen used to make two versions of screwdriver antennas? One was low, the other high power.) [/QUOTE]

Top Bottom