[TowerTalk] Metal roof

[Jim W7RY]

Now that is a comparison!  Buxcom to DX Engineering.   "hahaha"

Rolling my eyes...

73
Jim W7RY


--------------------------------------------------
From: "David Jordan" <wa3gin at comcast.net>
Sent: Friday, August 05, 2011 3:13 PM
To: <towertalk at 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 at earthlink.net>
> To: <towertalk at 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.
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