Consider what W8JI says about end fed ants. He also addresses the PAR.
Interesting observation from one set of calcs he did- Maximum antenna
current is .758 amperes, while the coax common mode current maximum is
actually 1.02 amperes!
https://www.w8ji.com/end-fed_1_2_wave_matching_system_end%20feed.htm
Without a decent counterpoise, the Z you see could be anything. What
you see will be a function of your particular counterpoise.
Yes it can work with the KX2 with no coax feed line and those power levels.
His remarks about using high power are interesting.
73 de Brian/K3KO
On 1/8/2018 23:07 PM, rich hurd WC3T wrote:
Try a 64:1 balun. That's what our antenna expert at our club suggests for
resonant end fed antennas.
On Mon, Jan 8, 2018 at 5:59 PM, Rich Arland <[email protected]> wrote:
I have one of the original PAR end fed half wave antennas prior to LNR
taking over production and sales.
Everything is present EXCEPT the little matching network that couples the
EFHW to the radio. I tried contacting LNR to obtain a new one but they told
me that they couldn't do that, BUT they would sell me a new version of the
complete antenna for the paltry sum of around $80! I said "no thanks" and
hung up the phone.
I am after the schematic or the best guess of the components and parts
placement that will resonate this 40-30-20M antenna. It's not rocket
science but it's close!! As I understand it these antennas are fairly high
impedance wise, so I need some kind of matching network to bring that down
to around 50 ohms for the KX2.
Failing that path, has anyone hooked an EFHW to the internal ATU with good
results? I would also include a cut to frequency ground radial that I would
lay out below the antenna. That would be the easiest thing and simple to
employ.
Over the next 10-12 days I am planning on doing some portable operating
from MD and PA. Taking the KX2 with me and hope to get some operating time
between family obligations.
Opinions, observations, ideas please.
Vy 73 es gud DX!
Rich Arland K7SZ
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