I have the 160-80-40 twin sloper attached at 50' on a rohn 25 tower a couple
of feet below a force 12 c3 triband beam. I have 3 buried 35' radials
connected to the tower legs and have no room for more. On 40 I also have a
half wave dipole on a separate tower also at 50' and I can rarely tell any
difference in signals received or transmitted but the half wave dipole is
more wideband. I also have a half wave dipole on 75 at 50' and it is
noticeably better tx or rx than the sloper most of the time and it is more
broadband then the sloper. On 160 the sloper is the only antenna I have
room for and it is very noisy on receive and does not transmit well either
and only has about 50kc of usable bandwidth. I do not run more than 200
watts on 160 because I was warned by NU5D who tried to run 500 on his and
the end insulator caught fire! I wish I had room for a full half wave on
160 but like most of us do not have room for it unless the next door
neighbor would let me run 1 leg to a tree in her back yard. She might let
me do it if it did not interfere with her TV or stereo but I am chicken to
ask (my wife does not want me to ask either because the neighbor is a single
woman)!!!!!
wb5oxq
----- Original Message -----
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
Cc: <towertalk@contesting.com>
Sent: Sunday, December 28, 2008 2:02 PM
Subject: Re: [TowerTalk] Quarter Wave Sloper (half sloper)
>
>
> Bob Kellow wrote:
>> Been trying to get up to speed on these...Learned that height is not
>> important, as it's the tower that will radiate, primarily. My tower is
>> 70'
>> with a Steppir 3 ele and other assorted antennas for VHF, all on a 10'
>> mast.
>> Looking at the Alpha Delta DX-B, which would give me 30/40/80/160m. Has
>> anybody installed one of these on a 70' tower? If so, what height was
>> ideal? Would like to do this right the first time....Thanks.
>>
>>
> I really don't think it's the tower that radiates. I use a relatively
> steep 1/4 sloper on 160. It tuned just like any other antenna with
> pruning and seems to favor (slightly) the direction in which the wire
> slopes.
> at the bottom of http://www.rogerhalstead.com/ham_files/tower.htm is a
> write up and photos that show the assembly that mounts very close to the
> top of the tower. Initially it was resonant on the low side. Pruning
> adjusted the frequency just like it would on a dipole.
>
> 73
>
> Roger (K8RI)
>
>> Ed NI6S
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>>
>>
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>>
>>
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