[TowerTalk] Broadbanding 80 meter dipole

[Steve Maki]

If the tuner(s) are mounted on the tower.

-Steve K8LX

On 8/17/2017 7:53 PM, Steve Maki wrote:
> Except Roger is envisioning sloping *dipoles*, FIVE of them. Somehow I 
> can't picture five tuners hanging out there in mid-air at the 
> feedpoints, begging to be tuned up and down the band. Not to mention 
> that whatever pattern he's hoping for will be hopelessly compromised by 
> common mode currents on the feedlines between the antenna and tuner.
> 
> -Steve K8LX
> 
> On 8/17/2017 4:16 PM, Kimberly Elmore wrote:
> 
>> Rod's idea is by far the best. Slopers are weird creatures. While you 
>> can broadband antennas by making the elements with a large diameter 
>> (as in a cage) the mechanical complexity isn't worth it. If they 
>> absolutely positively must be resonant, well...
>>
>> Kim N5OP
>>
>>        From: Rod Greene via TowerTalk <towertalk at contesting.com>
>>   To: Roger (K8RI) on TT <K8RI-on-TowerTalk at tm.net>; 
>> "towertalk at contesting.com" <towertalk at contesting.com>
>>   Sent: Thursday, August 17, 2017 2:25 PM
>>   Subject: Re: [TowerTalk] Broadbanding 80 meter dipole
>> Or use an auto tuner at the feedpoint to match the slopers on whatever 
>> band/freq you want to use. That's what I do.
>> 73, Rod/w7zrc
>>
>>
>>        From: Roger (K8RI) on TT <K8RI-on-TowerTalk at tm.net>
>>   To: "towertalk at contesting.com" <towertalk at contesting.com>
>>   Sent: Thursday, August 17, 2017 12:33 PM
>>   Subject: [TowerTalk] Broadbanding 80 meter dipole
>> I've seen a few possibilities in the past, but I'd like to add a dew
>> slopers to come up with the 5 used for some directivity, gain and front
>> to back. Switched coils at the feedpoint with frequency sensing would
>> likely work.  I've had excellent results with just a couple switched
>> slopers on 40.
>>
>> To complicate things I'd like to do this and maintain the dual band 75 /
>> 40 meter operation, which would likely require separate feedlines. The
>> unused line would / could end up as a stub.  I could possibly use the
>> frequency sensing to disconnect the coax for the unused band.
>>
>> Thoughts?
>>
> 
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