Re: NEC-LIST: Broadband VHF Whip

It is fairly easy to build a broad-band receiving antenna if you are
willing/able to accept the penalities involved.

Start by placing a resistor across the receiver input terminals, with
a value equal to the input resistance of the receiver. Connect the
whip to the high of the input. Vary the value of the resistor, to get
the best output S/N across the band. There will be marked loss, but
it has negligible importance if the RF S/N is high enough, with
Nrf>>Nreceiver, and there is enough receiver gain. In any event, the
loss may be acceptable in the service.

Such an antenna was advertised for some years for the 3-30 Mhz band.

You can model the loss with NEC. It seems that only the actual
equipment to be used is satisfactory for the S/N work, so maybe a
variable resistor would be indicated.

R.P.Haviland
Received on Thu Mar 15 2001 - 05:07:08 EST