ELECTRO-METRICS RVR-30M VERTICAL ANTENNA
(RVR30M-4)
To convert the resulting two-terminal reading to the appropriate field strength when using
the RVR-30M, simply add the "antenna factor in dB" at the frequency of interest from the
Antenna Factor Chart for the antenna being used.
Example:
Signal Amplitude Indication........................................+20 dB(µV)
Two-terminal voltage indication is thus.......................+20 dB(µV)
Antenna factor from graph (typical)............................+40 dB(m-1)
Field Strength intercepted by antenna is......................+60 dB(µV/m)
The above procedure is similar for most 50-ohm receivers.
6.2 Broadband Radiated Signals
After determining that the signal is truly a broadband signal (refer to Section II Para. 2.4.7
EMC-30 Manual for a method of determining whether a signal is broadband or narrowband),
proceed to determine the correct two-terminal broadband level using the calibration and
operating procedures of the 50-ohm receiver being used.
To convert the resulting two-terminal reading to the appropriate broadband field strength
when using the RVR-30M, simply add the "antenna factor in dB" at the frequency of interest
from the Antenna Factor Chart for the antenna being used.
Example:
Signal Amplitude Indication.......................................+20 dB(µV)
Broadband Conversion Factor....................................+60 dB(µV/MHz)
Two-terminal broadband signal level..........................+80 dB(µV)
Antenna factor from graph (typical)............................+40 dB(m-1)
Broadband Field Strength...........................................+120 dB(µV/m/MHz)
The above procedure is similar for most 50-ohm receivers.
6.3 Antenna Induced Voltage
Since the effective height of the 1-meter (41-inch) RVR-30M is one-half meter, antenna
induced voltage (open circuit) is:
Ea= E x he,
where:
E = Field strength (µV/m),
he= Effective height of the RVR-30M (equal to 0.5 meter).
Therefore:
Ea= 0.5E.
To find antenna induced voltage in dB(µV), simply subtract 6 dB from any field strength
reading determined using the procedures stated within this manual.
