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

DB, I don't know how the currents on the mast/coax in this case effects the antenna. I mentioned this earlier. I was only calling attention to our seeing the maximum primary radiating portion, the 1/2 wave section, as being in phase on the Imax model.

Over time I have had antennas that acted bad with what I thought were currents on the mast/coax, but I never observed this to make the antenna any less effective...just using my radio, and I don't see it in modeling either.

My point in all of this, concerns the claims we often hear that states...if we can minimize or eliminate these currents on the mast/coax, these same currents will then be redirected onto the antenna and thus increase the gain.

My models don't show any noteworthy gain when I isolate the mast and minimize or stop the CM type currents flowing on the mast/coax DB. I don't know how to do this with Eznec using the choke feature. Maybe you can help me out.

Can you show us what happens with the gain on the model you posted above, before and after you add the choke?

<blockquote data-quote="Marconi" data-source="post: 549164" data-attributes="member: 903">DB, I don&#039;t know how the currents on the mast/coax in this case effects the antenna. I mentioned this earlier. I was only calling attention to our seeing the maximum primary radiating portion, the 1/2 wave section, as being in phase on the Imax model.Over time I have had antennas that acted bad with what I thought were currents on the mast/coax, but I never observed this to make the antenna any less effective...just using my radio, and I don&#039;t see it in modeling either.My point in all of this, concerns the claims we often hear that states...if we can minimize or eliminate these currents on the mast/coax, these same currents will then be redirected onto the antenna and thus increase the gain.My models don&#039;t show any noteworthy gain when I isolate the mast and minimize or stop the CM type currents flowing on the mast/coax DB. I don&#039;t know how to do this with Eznec using the choke feature. Maybe you can help me out.Can you show us what happens with the gain on the model you posted above, before and after you add the choke?</blockquote>

[QUOTE="Marconi, post: 549164, member: 903"] DB, I don't know how the currents on the mast/coax in this case effects the antenna. I mentioned this earlier. I was only calling attention to our seeing the maximum primary radiating portion, the 1/2 wave section, as being in phase on the Imax model. Over time I have had antennas that acted bad with what I thought were currents on the mast/coax, but I never observed this to make the antenna any less effective...just using my radio, and I don't see it in modeling either. My point in all of this, concerns the claims we often hear that states...[I][B]if we can minimize or eliminate these currents on the mast/coax, these same currents will then be redirected onto the antenna and thus increase the gain.[/B][/I] My models don't show any noteworthy gain when I isolate the mast and minimize or stop the CM type currents flowing on the mast/coax DB. I don't know how to do this with Eznec using the choke feature. Maybe you can help me out. [I][B]Can you show us what happens with the gain on the model you posted above, before and after you add the choke?[/B][/I] [/QUOTE]

Top Bottom