Now that is a comparison! Buxcom to DX Engineering. "hahaha"
Rolling my eyes...
73
Jim W7RY
--------------------------------------------------
From: "David Jordan" <wa3gin@comcast.net>
Sent: Friday, August 05, 2011 3:13 PM
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Metal roof
> Our court house has a copper metal roof (flat). Hustler Vertical antennas
> require an added $45. shunt coil (16 turns) to couple the low impedance to
> 52ohm coax. The Hustler vertical trap antennas are not designed to
> operate
> over a perfect or very good ground radial system. I guess there are more
> poor to fair radial systems out there then good ones. So those of us with
> good ones have to pay an extra $50 BUCKS... GO FIGURE! BUXCOMM sells
> OCF antennas and they offer their antenna in three options, all for the
> same
> price. So, you tell them the wire is going to be up over 50ft you get one
> type of balun... if it close to the earth you get a different one or if it
> is going to be over a roof of a building yet a third type, but they don't
> screw you because of your choice, geez DX Engineering, hahaha
>
> 73,
> Dave
> wa3gin
> ----- Original Message -----
> From: "Jim Lux" <jimlux@earthlink.net>
> To: <towertalk@contesting.com>
> Sent: Friday, August 05, 2011 3:40 PM
> Subject: Re: [TowerTalk] Metal roof
>
>
>> On 8/5/11 11:44 AM, Pete Smith wrote:
>>> Without any direct experience, other than a trap vertical on a 20 x 40
>>> metal roof made up of 4x8 metal sheets, I'd say a vertical would work
>>> fine, but anything else nearby could be adversely affected. I also
>>> wonder, at least in theory, if you wouldn't risk imperfect electrical
>>> connections between shingles becoming harmonic-generating diodes, in the
>>> presence of a strong RF field.
>>>
>>
>> But... what about all the harmonic generating diodes from the chicken
>> wire under the stucco, or the woven mesh of a chain link fence.
>>
>> I think the harmonics & diodes thing pops up more in situations where
>> you have multiple transmitters in a single location, generating spurs
>> that get into receivers at that same location.
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|