Interesting...perhaps someone can tell me what is the gain of my NVIS
system.:
Four full wave dipoles (cut to 7mhz) at 15ft above four full wave
dipoles (5% longer) laying on the ground.
The driven elements are feed in phase with 600 ohm open wire line.
thanks,
dave
wa3gin
Al Williams wrote:
>----- Original Message -----
>From: "Al Williams" <alwilliams@olywa.net>
>To: <Sent: Tuesday, November 05, 2002 8:28 AM
>Subject: Re: [Towertalk] Low dipoles
>
>
>>> A novel east coast idea via K3LR years ago is to put a reflector
>>>
>wire
>
>>on
>>
>>>the ground under the low dipole. Cheap and easy way to get some more dB
>>>
>in
>
>>>the air.
>>>
>>>Cheers,
>>>
>>
>>From time-to-time this idea is floated, but does it have merit?
>>
>>First, Earth is said to be a pretty good reflector.
>>
>>Second, EZNEC reports for a half-wave 68' dipole 30' high at 7.04 mhz:
>>
>>no reflector perfect ground 7.93 dbi straight up
>>
>>70' refl on gnd " 7.93 "
>>
>>no reflector real ground (.005) 6.39 "
>>
>>70' refl on gnd " 6.58 "
>>
>>
>>73 k7puc
>>
>
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