https://discussions.flightaware.com/t/measuring-antenna-performance/19651/10
AN EXPERIMENT TO DEMONSTRATE HOW THE MEASURED VALUES ARE AFFECTED BY LENGTH OF COAX BETWEEN ANTENNA ANALYZER AND DEVICE UNDER TEST.
MEASUREMENT OF 75 Ω DUMMY LOAD THROUGH DIFFERENT LENGTHS OF RG6 COAX
TEST SETUP
COAX PIECE #1
Physical length =130 mm (including connectors), Electrical length = 130/0.84 = 155 mm = 0.564 λ
Measured R= 44.92 ohm
COAX PIECE #2
Physical length =150 mm (including connectors), Electrical length = 150/0.84 = 179 mm = 0.651 λ
Measured R= 34.01 ohm
COAX PIECE #3
Physical length =230 mm (including connectors), Electrical length = 230/0.84 = 274 mm = 1.0 λ
Measured R= 77.26 ohm
COAX PIECE #4
Physical length =260 mm (including connectors), Electrical length = 260/0.84 = 391 mm = 1.42 λ
Measured R= 32.46 ohm
