Re: PAR/LNR EFHW antenna

Posted by briancom on Jan 08, 2018; 11:38pm
URL: http://elecraft.85.s1.nabble.com/PAR-LNR-EFHW-antenna-tp7637237p7637243.html

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 <[hidden email]> 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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