[Hallicrafters] Snow / Antenna question.

[jeremy-ca]

Try telling that to anyone who has had HF yagis ice up. The VSWR goes WAY up 
until the sun melts the ice. Its no fun when it happens during a contest! 
Since these antennas are quite narrow band the effect is dramatic.

I and anyone else in the ice belt has experienced it. Light snow just 
sitting on the elements has no effect.

VHF/UHF high performance yagis are designed so that the bandwidth is wide 
enough so that they arent detuned in plain old rain. They become rotary 
dummy loads when iced up.

Carl
KM1H



----- Original Message ----- 
From: "Bill Gerhold" <k2wh at optonline.net>
To: <hallicrafters at mailman.qth.net>
Sent: Saturday, February 02, 2008 4:41 PM
Subject: RE: [Hallicrafters] Snow / Antenna question.


> No.  Snow or ice is virtually invisible to RF unless it has minerals or 
> salt
> in it.  Other than that, it's not there.
>
> K2WH
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Waldo Magnuson
> Sent: Saturday, February 02, 2008 11:51 AM
> To: hallicrafters at mailman.qth.net
> Cc: Waldo Magnuson
> Subject: [Hallicrafters] Snow / Antenna question.
>
> Spokane, WA has been getting a lot of snow this winter (about 70 inches
> so far) and yesterday my horizontal 40 m dipole had about 2 or 3 inches
> piled up on it (and it did sag a little).  My transmitter is currently
> undergoing some repair so I couldn't check but I know some of you will
> know the answer to this question.  Will transmitting on 40 m at about
> 100 watts do any warming of the antenna and remove the snow?  Thanks.
> 73,  Skip  W7WGM
>
> ______________________________________________________________
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