On Sat, Sep 21, 2019 at 06:55 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:
I don¡¯t think it will be possible to *objectively* measure HT antennas. So
much depends on how they are held, the size of the person etc.
It is possible. For example 145 MHz antenna has near field range about 1 meter. So, you can place two antennas for example 4 meters away from each other. Signal loss at 4 meters for 145 MHz will be 28 dB. It is well fit into NanoVNA dynamic range :)
For 433 MHz near field region is just 0.35 meter. So, you can place two 433 MHz antennas 1-2 meters away from each other. Signal loss at 2 meters 433 MHz will be 31 dB. It is also well fit into NanoVNA dynamic range.
The same for 27 MHz antenna. 27 MHz antenna has near field range about 5.6 meters. Signal loss will be about 21 dB for 10 meters and 27 dB for 20 meters. So, you can place two antennas 10-20 meters away from each other and use NanoVNA to compare antenna efficiency.
