[TowerTalk] Balanced Feedline for Ground Mounted Vertical?

[WA3GIN]

It might be more fun to get an outdoor shed, a battery, a solar cell charger 
and put the radio in the shed and run it with an 802.11G wireless link back 
to the house.  No long runs of wires to worry about, no losses or noise 
pick-up, etc.

73,
dave
wa3gin

----- Original Message ----- 
From: "K4SAV" <RadioIR at charter.net>
To: <towertalk at contesting.com>
Sent: Saturday, May 23, 2009 12:25 PM
Subject: Re: [TowerTalk] Balanced Feedline for Ground Mounted Vertical?


>I would recommend also matching the open wire line (or ladderline) to
> the antenna at the antenna end.  If you did all the matching at the
> shack end and had 2000 ft of Wireman 551, the feedline loss on 80 meters
> would be about 6.4 dB.  On 20 meters it would be about 9.6 dB.  You also
> need to take care of the balanced feedline to unbalanced antenna
> problem, otherwise the feedline will radiate a lot, and with that length
> of feedline, could become the primary radiator instead of the vertical.
>
> Even with a matched load and using 2000 ft of Wireman 551, the feedline
> loss should be about 4 dB at 10 MHz.  I would look closely at building
> some custom open wire line which can be made to have lower loss, and use
> a matching system at both ends.
>
> Jerry, K4SAV
>
> Joe Giacobello wrote:
>> If one had to install a ground mounted vertical as far as 2,000 feet
>> from the shack and wanted to avoid the expense of using low loss coax,
>> could a balanced feedline be used as an alternative?  The idea would be
>> to run the balanced feed line to the base of the antenna and connect to
>> the antenna through a current balun.  The input to the feedline and the
>> antenna would be matched by means of a balanced tuner in the shack.
>>
>> Anyone have any thoughts on the effectiveness of this arrangement?
>>
>> Thanks and 73,
>>
>> Joe
>> K2XX
>> _______________________________________________
>>
>>
>
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