Antenna Analyzer AIM4170 page 36
Frequency Source
The AIM4170 can be used as a signal source for testing electronic circuits, such as radio
receivers. The programmed frequency has a nominal accuracy of +/-30ppm and it can be
calibrated with respect to WWV at 10MHz. The amplitude of the output is not regulated
by an AGC circuit but it is flat within 1 db across any amateur band.
The flatness can be improved by terminating the output of the AIM4170 with a 90 ohm
resistor before connecting the 50 ohm coax to the circuit under test. If the interconnecting
cable is 75 ohms, the AIM4170 terminating resistor should be 225 ohms. If flatness is
not important, the coax can be connected directly to the AIM4170.
The nominal signal delivered to a 50-ohm load is about 30mv rms. If an extra 90 ohm
terminating resistor is used, the signal level will be about 7mv rms across 50 ohms.
Enter a frequency value in the text window and click “Enter”. The frequency can then be
incremented or decremented by clicking the +/- buttons.
To calibrate the frequency to WWV, tune in WWV at 10MHz and adjust the AIM4170
output to zero beat with it. Then click the “cal” button shown in the dialog box below.
This will apply a correction to all frequencies that are programmed later. The correction
is also saved in the .ini file and automatically recalled each time the program starts up.
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