5 | 9
Locate a TV station in the low VHF band and adjust the monitor for best picture. Locate the attenuator
on the PR-422CA/PR-420CA and turn it full counter clockwise to introduce maximum attenuation of
20 dB. Turn the attenuator slowly clockwise while observing the monitor.
At some point some signal degradation may be noticed as the amplifier starts to over-drive.
At this point the attenuation should be increased again slightly CCW to limit over driving. The amp is
now at maximum gain without overdrive.
Using a Signal Generator and Frequency Selective Voltmeter: For the channel under adjustment,
disconnect the antenna or other input device. Feed the generator to the Antenna Input port via a DC
block. Adjust the level of the generator for 0 dBmV and a frequency suitable for the amplifier being
adjusted. Measure the signal at the outlet with the weakest signal (typically at the end of the longest
or highest loaded branch. Using the corresponding attenuator, adjust so as to obtain a level of max
0dBmV at this outlet. Repeat the above procedure for each amplifier in the system.
When replacing the older MK-20CA antenna you will need a BNC to F connector which we supply free
of charge with a splice kit, when requested.
Technical Specifications
Frequency range:
PR-422CA AM-FM-TV Antenna: 1.0-30MHz and 40-860 MHz
PR-420CA
FM-TV
Antenna:
40-860
MHz
Gain: 14-25 dB
Noise factor: 4.5 dB Max.
Output level: 111 dBuV (2 signals-50 dBIM)
Supply voltage: 15 V DC
Current consumption: approx. 130 mA
CE Mark designed tested and certified.
