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

Well, adding capacitive reactance would tend to electrically shorten the antenna.

Perhaps the cap is added to increase the DC isolation, improving it's ability to insulate against as much as 15kv to pass FCC regs.

Since the Imax measures correctly for a 5/8 on 11m, I'd presume the capacitive reactance is nullified by an appropriate amount of inductance in the bottom matching network.

- What I find thought provoking is the fact the phase of the radiation is being shifted above the capacitor, and how does that (Marconi?) tend to affect the pattern & TOA?

Perhaps if someone knew the value of the capacitor...?

[QUOTE="Needle Bender, post: 546085, member: 13339"] Well, adding capacitive reactance would tend to electrically shorten the antenna. Perhaps the cap is added to increase the DC isolation, improving it's ability to insulate against as much as 15kv to pass FCC regs. Since the Imax measures correctly for a 5/8 on 11m, I'd presume the capacitive reactance is nullified by an appropriate amount of inductance in the bottom matching network. - What I find thought provoking is the fact the phase of the radiation is being shifted above the capacitor, and how does that (Marconi?) tend to affect the pattern & TOA? Perhaps if someone knew the value of the capacitor...? [/QUOTE]

Top Bottom