|1900 SERIES FCC ID: IJ3PI1900
Prices effective April 4, 2015
| When compared to previous generation equipment, the
1900 series Antenna Monitors provide better performance over a wider
dynamic range with virtually no modulation effects. Separate measuring
circuits are employed for each tower. Remote control interfacing is
greatly simplified because these monitors provide simultaneous outputs
for the measured Phase Angle and sample Current Ratio of each tower.
Therefore, it is not necessary for the remote control system to select
a specific tower prior to interrogating a particular telemetry output
To facilitate maintenance and system reconfiguration, all active
circuits are packaged on plug-in printed card modules which are
accessible at the rear panel of the monitor. 1900 series Antenna
Monitor metering capacity (number of towers) may be increased or
decreased by adding or removing individual metering modules.
(Two Towers, 1 to 3 Patterns) |
|Monitor unit with front panel display, local operating controls, and|
complete interface capability to remote control systems.
| Display Unit for extension manual
control and reading of the 1901 |
or 1903 Monitors (1-3/4" Panel Height).
Antenna Monitor (Two Towers, 1 to 3 Patterns)
|Monitor unit with no display or controls,
for control from a Type 1902|
Monitor Display, with complete remote control interface.
Tower Inputs Metering Board (1 each required for each tower)
|Circuit Card for one Tower input.
Provides full metering |
support and outputs for Phase Ratio and Amplitude for one Tower.
|NUMBER OF TOWERS
||1903 w/ 1902
| A 1901 or 1903 Antenna Monitor consists of a
chassis with power supplies and a control board which can support
up to (l2) Type 1910 Tower Input Metering Boards. The basic
unit is supplied with two (2) 1910 Boards. A four tower array
would require two additional l910 Boards for a total of four
l9l0 Tower Inputs. Potomac Instruments will configure a 1900
series monitor and conduct it's final tests at the station frequency
if the following information is specified at the time of the
|Number of Towers (2-12)
|| ________ Twrs.
|Number of Patterns (1-3)
|| ________ Pats.
|| ________ Y / N
|Reference Tower for each Pattern
|| ________ D/N/3rd
|| ________ Khz
|Sampling Line Impedance (50 or 75 ohms)
|| ________ Ohms
|Input Connector Type (UHF or N)
|AC Voltage (117, 230 or 245 VAC)
|| ________ VAC
|AC Frequency (50 or 60 Hz)
|| _________ Hz
| To the extent feasible 1900 series antenna monitors
can be manufactured for low signal levels or may incorporate
custom filters for applications involving interference derived
from a nearby transmitter facility or from diplexing more than
one frequency onto a single antenna system.
Filters are custom designed, manufactured and certified for
each specific application and are thus considered to be "Custom
Engineering Projects." Potomac Instruments will design, manufacture,
and test the filter performance in the specific Antenna Monitor.
Potomac will also certify that the Antenna Monitor meets or
exceeds its original FCC Type Approval specifications and maintain
full records of each system for service and technical support.
In all cases Potomac Instruments will need to carefully define
the design parameters of such filters. Accordingly, sampling
system design and the specifics of the Desired to Undesired
(D/U) signals that appear at the, properly terminated, RF input
connectors of the antenna monitor must be understood.
If the diplexed or interfering signals are already present on
the antenna the data necessary for Potomac to proceed with a
design can be obtained by using a Potomac Instruments' FIM-41
or FIM-21 to measure the relative amplitude of the desired signal
and each of the undesired signals from the sampling system.
Potomac will supply detailed instructions to assist in this
process or the station can utilize a consulting engineer to
prepare the necessary data.