Re: LF: Re: Mini-Whip Antenna

["Roelof Bakker" <roelof@ndb.demon.nl>]

Hello Minto,

In laboratory tests it is possible to tweak the bias of the J310 for a  
very high IP2 of +80 dBm and a IP3 of +33 dBm.
However this does not hold in off air tests.

I use the medium wave stations at Orford Ness, UK as off air signal  
generators.
The station at 648 kHz is on 24/7, but the one at 1296 kHz only in part of  
the morning and between 16:00 and 17:00 UTC.
I found IP3's ranging from about + 15dBm to + 20 dBm depending on supply  
voltage.
Maybe you can use these stations as well for test purposes.
At my location they produce each -20 dBm at the output of a mini-whip  
mounted 5 metre up.
Except for the directive properties of a loop, both loops and whips can  
deliver stellar performance on reception.
It depends on the local noise situation which type of antenna gives best  
results.
73,
Roelof, pa0rdt