ETS-Lindgren 3301B Active Rod & Field Antenna (Archived) - Manual (Page 33)

The Antenna Factor | 33
10.0 The Antenna Factor
The antenna factor data provided with the unit is simply a ratio of the field
strength presented to the unit to the voltage output from the unit at that field
strength. By adding the antenna factor to a given output, the field strength may
be derived. The antenna factor in the Model 3301B combines several factors.
The first factor is the 6 dB required to normalize the rod to 1 meter. The next is
the measured capacitive loss at the front of the unit of about 4 dB. Then there is
the gain of the amplifier itself, 15 dB. Finally, 6 dB is required to conjugate match
the output to 50 ohm. The antenna factor is the sum of these factors. A typical
result might be:
– 6 dB Rod Normalization
– 4 dB Capacitive Loss
+ 15 dB Preamlifier Gain
– 6 dB 50 ohm Matching Loss
= – 1 dB Gain Over Field Strength or Antenna Factor of 1 dB
Archived 3/18/10