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bootie,
w8ji modeled the imax with a worst case mast or feedline length scenario that promotes maximum common mode radiation.
i think you missed his opening statements,

End-fed Vertical and J-pole

when i tested my imax vs the i10k on a short mast the imax was way behind, it was also behind the sirio 827 ( no skip )

i took the imax portable on a 10ft flagpole, performance was reported as been about the same as my 1/4wave whip on the car roof and i could not use the amplifier because of high common mode currents badly screwing up my ssb audio, a choke did not help,

on the other hand i have also had decent results from both the a99 and imax,
on a 1 wavelength pnumatic mast i experienced the old a99 equal my sirio 2012 5/8wave to the majority of my locals.

<blockquote data-quote="bob85" data-source="post: 281954" data-attributes="member: 18">bootie,w8ji modeled the imax with a worst case mast or feedline length scenario that promotes maximum common mode radiation.i think you missed his opening statements,<a href="http://www.w8ji.com/end-fed_vertical.htm#IMAX" target="_blank">End-fed Vertical and J-pole</a>when i tested my imax vs the i10k on a short mast the imax was way behind, it was also behind the sirio 827 ( no skip )i took the imax portable on a 10ft flagpole, performance was reported as been about the same as my 1/4wave whip on the car roof and i could not use the amplifier because of high common mode currents badly screwing up my ssb audio, a choke did not help, on the other hand i have also had decent results from both the a99 and imax,on a 1 wavelength pnumatic mast i experienced the old a99 equal my sirio 2012 5/8wave to the majority of my locals.</blockquote>

[QUOTE="bob85, post: 281954, member: 18"] bootie, w8ji modeled the imax with a worst case mast or feedline length scenario that promotes maximum common mode radiation. i think you missed his opening statements, [URL="http://www.w8ji.com/end-fed_vertical.htm#IMAX"]End-fed Vertical and J-pole[/URL] when i tested my imax vs the i10k on a short mast the imax was way behind, it was also behind the sirio 827 ( no skip ) i took the imax portable on a 10ft flagpole, performance was reported as been about the same as my 1/4wave whip on the car roof and i could not use the amplifier because of high common mode currents badly screwing up my ssb audio, a choke did not help, on the other hand i have also had decent results from both the a99 and imax, on a 1 wavelength pnumatic mast i experienced the old a99 equal my sirio 2012 5/8wave to the majority of my locals. [/QUOTE]

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