PDI-50121AM Agile Modulator
Description Features Specifications Manual (PDF)
PDI-50121AM Agile Modulator

The PDI-50121AM Agile Modulator		 DESCRIPTION
The PDI-50121AM is a PLL synthesized, SAW filtered, frequency agile modulator. It offers 133 TV channels at an output of 45dBmV. This exceptional unit is manufactured and tested to the highest standards and complies with all FCC requirements. The PDI-50121AM covers all cable channels from 2 through 134 (54-860MHz) including A-5 to A-1. VHF and HRC are also available. Channel selection is accomplished with "user friendly" up/down controls on the front panel. The selected channel is then automatically locked into memory to insure correct operation after a power failure. The PDI-50121AM consists of 12 individual, vertically mounted, frequency agile modulators and an efficient switching type power supply module mounted in one 3-1/2" high housing. It is designed for 19" rack mounting. Each modulator is SAW filtered and is factory set to the desired channel and proper offset. Recessed front panel controls are preset, at the factory, for 87.5% depth of modulation, ±25kHz audio deviation, and -15dBc video audio ratio. RF is set at maximum. It offers excellent video performance and high reliability in a 2U rack. Click here for the PDI-50121 White Paper in PDF format.
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FEATURES
+45dBmV RF output level
Microprocessor Up/Down button to select output channel in the range of 2 to 134 (54-860MHz) including A-5 to A-1 (95 to 99)
FCC offset externally selectable, 0kHz, +12.5kHz or +25kHz
>-60dB spurious performance at a video output level of 45dBmV
Professional grade SAW vestigial sideband filter for true adjacent channel operation
UHF and HRC available
 		PDI-50121AM Agile Modulator
12in1 PDI-50121AM
2 year warranty
UL Listed Canada/U.S.
BTSC stereo compatible
4.5 MHz input
SPECIFICATIONS
RF SECTION
Output Channels UP/DOWN Selectable 2 Through 134 including A-5 to A-1 (95-99)
Output Level +45dB Range
Output Level Adjustment 20dB Range
Spurious Output At least 60dB Below Video Carrier (@ +60dBmV Output With Aural Carrier 15dB Down)
Broadband Noise 80dB Below Video Carrier (@ +60dBmV Output)
Frequency Stability ±5kHz (±3kHz typical)
Vestigial Sideband Response -20dB at IF Channel Edge; -60dB at Adjacent Video and Aural Carrier Frequencies and Frequencies Further Removed
VIDEO SECTION
Input Type Composite Video, Negative Sync.
Input Level 0.5 Vp-p Min. for 87.5% Depth of Modulation
Frequency Response +0.75dB (10Hz to 4.2MHz)
Differential Gain 3% Typical at 87.5% Modulation
Differential Phase <3 Degrees Typical at 87.5% Modulation
Hum and Noise -60dB Min. at 87.5% Modulation
Tilt 1.1% Maximum on 60Hz, 50% Square Wave
Group Delay Response Meets FCC Distortion Requirements for Color Transmission
AUDIO SECTION
Input Type Unbalanced (Balanced optional)
Input Impedance 600 ohms
Input Level 250mV Min. for 25kHz Deviation
Frequency Response Mono ±0.75dB (30Hz to 20kHz)
Intercarrier Frequency 4.5MHz ±100Hz
OPERATIONAL
AC Line and Power 85 - 265 Vac, 60Hz, 25 Watts
Operational Temperature 0 to 50 Degrees C
Rear Panel Connections RF Output  F female
Video Input F female
Audio Input RCA
Front Panel Controls UP/DOWN Channel Select
CATV/UHF/HRC Mode Select (SET)
RF Output Level
Aural Carrier Level
Video Modulation Depth
Audio Deviation
Front Panel Indicators Power On LED
2 Digit Channel Number
+100 Range LED
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