On Mon, Apr 27, 2020 at 02:13 AM, Roger Need wrote:
I did some measurements today on a vertical whip antenna tuned for the top end
of the 2 m amateur band.
I have made a table to better see what is the result of the measurements from the PDF file.
For my understanding here the *precision of the frequency* is important.
Calibration MHz Scan MHz Step KHz SWR RL dB Lag KHz
0.05 - 900 0.05 - 900 9000 1.25 19.04 153.041-147.76= 5281
0.05 - 900 140 - 155 150 1.06 29.6 148.400-147.76= 800
140 - 155 140 - 155 150 1.07 29.13 147.600-147.76= 200
140 - 155 146 - 150 40 1.06 29.61 147.800-147.76= 40
146 - 150 146 - 150 40 1.06 30.34 0
*Result* : The frequency lag of maximum RL can not be (much) better, than the measuring step size.
So, watch the *Step Size* = scan width / 100.
73, Rudi DL5FA
