[Elecraft] KPA500 and KAT500 Ports

[Don Wilhelm]

  And full band coverage of 3.5 to 4.0 MHz with an SWR no greater than 
2:1 except at the very high end of the band where it goes to 2.5 can 
easily be achieved, I have one.  Take a look at the ARRL Handbook page 
9-16 and you can see it.  The "magic" is in the feedline  - 1 wavelength 
of 50 ohm (RG-213) followed by 1/4 wavelength of 75 ohm RG-11.  I hang 
mine as an inverted vee.

I would think the same principle could be extended to 160 meters if full 
band coverage there is desired.

73,
Don W3FPR

On 7/13/2011 1:28 PM, Dave Wright wrote:
> 'Cookie'
>
> Noted...but I think full-band, no-tuner coverage of 40/20/15/10 isn't too
> shabby.
>
> Dave
>
> On Wed, Jul 13, 2011 at 1:18 PM, WILLIS COOKE<wrcooke at yahoo.com>  wrote:
>
>> The request was in response to a statement that the KAT-500 was not
>> required if an all band antenna was used.  The challenge was to name an
>> antenna that will give full coverage WITHOUT  TUNER making the KAT-500
>> superfluous.  Of course, full coverage of 20 is 14.0 to 14.35 and 80 and 160
>> are included.  Alpha-Delta makes nice products, but achieving full coverage
>> on 160, 80, 20 and 10 is elusive.  Maybe you only work CW and don't care
>> about the phone band or 10 meter FM, but if so, you don't require full
>> coverage.  Even 40 requires you to accept a pretty high SWR at the ends to
>> cover the whole 40 meter band.  LPs can be good for broad banding, but even
>> the RCA LPs that I saw on Guam with the rotors that weighed about a ton only
>> covered 7.0 MHz and up.
>>
>> Willis 'Cookie' Cooke
>> K5EWJ&  Trustee N5BPS, USS Cavalla, USS Stewart
>>
>>
>>   ------------------------------
>> *From:* Dave Wright<hfradiopro at gmail.com>
>> *To:* elecraft at mailman.qth.net
>> *Sent:* Wed, July 13, 2011 11:43:49 AM
>> *Subject:* Re: [Elecraft] KPA500 and KAT500 Ports
>>
>> I'll second that Alpha-Delta reference.  Full band coverage on 40/20/15/10,
>> plus about 100kHz on 75/80, partial-full coverage on 17m although it isn't
>> cut for it, and some 6m as well.  Full coverage 80m-6m with tuner...and
>> even
>> 160m, but the efficiency has to be terrible.
>>
>> And easily handles 500w+
>>
>> 73
>>
>> Dave
>>
>> On Wed, Jul 13, 2011 at 12:26 PM, Ken - K0PP<kengkopp at gmail.com>  wrote:
>>
>>> Hi Cookie,
>>>
>>> My Alpha-Delta pretty much meets the no-tuner-needed
>>> requirement.  It's just a fan dipole with another name. (:-)
>>> I'm aware of at least five of them in this sparsely ham
>>> populated area.  It -is- bandwidth limited on 80/75, but
>>> mine's cut for 3550.
>>>
>>> My station is often used in major contests (KE7X) and
>>> we put up the AD as a 2nd station antenna that doesn't
>>> need any attention ... just switch to it and go.
>>>
>>> It's extremely well-made, but very heavy.  It's at 65',
>>> help up with 3/8" Dacron rope and heavy pulleys.
>>>
>>> 73! Ken - K0PP
>>>
>>>
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>>
>>
>> --
>> Dave
>> K3DCW
>> www.k3dcw.net
>>
>> "Real radio bounces off of the sky"
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>