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

Including the mast is important, it's the very reason why isolating the coax alone (RF choke) on a DC grounded vertical isn't enough to eliminate CMC, the mast will carry the CMC instead, it's worthy to note that unless the vertical antenna has resonant elevated radials then potentially the choke won't have enough impedance to eliminate the coax CMC completely

I've heard a number of chaps that won't use gamma matching on their beam antennas simply because of the current imbalance in such an installation, I can't say I've put much thought into it, maybe they have a point

<blockquote data-quote="northern35s" data-source="post: 419874" data-attributes="member: 17216">Including the mast is important, it&#039;s the very reason why isolating the coax alone (RF choke) on a DC grounded vertical isn&#039;t enough to eliminate CMC, the mast will carry the CMC instead, it&#039;s worthy to note that unless the vertical antenna has resonant elevated radials then potentially the choke won&#039;t have enough impedance to eliminate the coax CMC completely <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f631.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":ohmy:" title="Eek!&nbsp; &nbsp; :ohmy:"&nbsp; data-smilie="9"data-shortname=":ohmy:" />I&#039;ve heard a number of chaps that won&#039;t use gamma matching on their beam antennas simply because of the current imbalance in such an installation, I can&#039;t say I&#039;ve put much thought into it, maybe they have a point <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":confused1:" title="Confused&nbsp; &nbsp; :confused1:"&nbsp; data-smilie="5"data-shortname=":confused1:" /></blockquote>

[QUOTE="northern35s, post: 419874, member: 17216"] Including the mast is important, it's the very reason why isolating the coax alone (RF choke) on a DC grounded vertical isn't enough to eliminate CMC, the mast will carry the CMC instead, it's worthy to note that unless the vertical antenna has resonant elevated radials then potentially the choke won't have enough impedance to eliminate the coax CMC completely :ohmy: I've heard a number of chaps that won't use gamma matching on their beam antennas simply because of the current imbalance in such an installation, I can't say I've put much thought into it, maybe they have a point :confused1: [/QUOTE]

Top Bottom