ETS-Lindgren 4610 Royce Field Site Source (Archived) - Manual (Page 19)

Application | 19
5.0 Application
Before placing into operation, see Safety and
Regulatory Information on page vii.
The Model 4610 Royce Field Site Source is a portable self-contained comb
generator. This device can be used as an aid for maintaining the integrity of a
test site and the accuracy of test results. By comparing daily test site
measurements with the original reference measurement, sources of unexplained
variances due to the test site and test equipment can be more easily identified.
Using the Model 4610 does not take the place of periodically performing site
calibration per the FCC, VDE, or MIL-STD requirements. To establish a
reference for an individual test site (indoor or outdoor), the Model 4610 is placed
on the test site in the area normally occupied by the Equipment Under Test
(EUT). Power is applied to the unit by depressing the power switch. The power
switch will show a green color, indicating the power switch is in the On position.
Also, the power on indicator light will be illuminated. The Model 4610 is now
radiating a comb of signals between 10 MHz and 600 MHz, spaced at 10 MHz
increments. Using an antenna and a spectrum analyzer or receiver, the
frequency and amplitude of each signal point is recorded. This initial
measurement becomes the reference point for all future site measurements. The
accuracy of the Model 4610 can be verified by removing the transmitting rod and
connecting the output connector to a spectrum analyzer.
The Model 4610 is not a licensed transmitter; therefore, the output power level is
extremely low. A preamplifier is required on the output of the receiving antenna to
amplify the output signals from the Model 4610. A 26-dB preamp is
recommended for this purpose. Radiated Emissions from Open Area Test (OAT)
Site on page 25 shows a typical spectrum analyzer output plot of the signal
pattern from the Model 4610 using a 26-dB preamp. This is the type of signal
pattern found on an Open Area Test (OAT) site.
See References on page 21.
Archived 3/18/10