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Inphone Electronics Enterprise Co., Ltd.
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IRFM-55S Audio/Video Saw-filtered Modulator

IEEC IRFM-55S, a professional quality audio/video modulator that provides a modulated video and aural RF carrier output on a fixed channel from 54MHz to 361MHz (CH 2~47). Ideally engineered to accept video sources such as a satellite receiver, demodulator, TV camera, DVD player, video tape recorder or any compatible input with front panel control and monitor test port. The unit provides high quality video, color and audio signals on any unused channel within a closed circuit MATV, SMATV or CATV system.

　

IRFM-55S is a professional quality microprocessor and highly accurate DIP switch controlled digital Phase-Locked Loop (PLL) synthesized single channel a/v modulator that is guaranteed accurate frequency locking for solid drift-free operation.
　

Low cost SAW-Filtered modulator is a quality vestigial sideband heterodyne a/v modulator that maintains a full 55dBmV minimum output for optimum carrier-to-noise performance and provides a modulated visual and aural RF carrier output on any single channel up to 361MHz.
　

The unit is lab-retunable within band via internal DIP-switch channel selection and minimum output filter retuning for reduced stocking inventory and less down time.
　

SAW-Filtered IF for higher spurious free output and excellent adjacent channel interference performance enables greater frequency stability, spurious free output and drop-in channel expansion.
　
　
　
   
 •Model ：IRFM - 55S
Description  Parameters    Min Typ Max Unit
Output  RF Output Frequency Range (Fixed channel)  54 ---- 361 MHz
Output Level   55 ---- ---- dBmv
Output Adjustment    12 15 ---- dB
-30dB Test Point (Output 75Ω) ---- ±2 ±3 dB
Spurious Output @55dBmV (54-361MHz)   
A / V Carrier 		-60 -63 ---- dBc
-15dB ---- ----
Side-band Filter Response )   
@87.5﹪Modulation (Multiburst)
Frequency : Fv-2.0MHz
                      Fv-3.58MHz
                      Fv-4.50MHz		 ---- ---- ---- dBc
---- ---- ----
-50 -55 ----
-60 -62 ----
-60 -62 ----
Frequency Stabilitye (Offset CH.±5KHz)       ---- ±5 ±10 KHz
Output Return Loss (Output @55dBmV) 12 15 ---- dB
Audio Carrier Adjustment (Tolerence ±3dB) 12 ---- 19 dB
Video Input Level @87.5﹪Modulation    ---- 1 ---- Vp-p
Visual C/N @4MHz BW 60 63 ---- dB
Frequency Respones @30Hz to 4MHz  ---- ±1.0 ±1.5 dB
Audio Input Level @25kHz Deviation (Sin 1KHz) 0.5 ---- ---- Vp-p
Sub-Carrier Frequency 4.5MHz ---- ±1 ±3 KHz
Audio Response 40Hz to 15KHz (75us pre-emphasis)    ---- ---- ±1.5 dB
General Peak To Peak Video to 60Hz RMS Hum -60 -65 ---- dB
AC Power 105~127VAC60Hz ---- 10  ---- W
Dimensions 483×102×44 ----  ---- ---- mm
General Peak To Peak Video to 60Hz RMS Hum     -60 -65 ---- dB
AC Power 105~127VAC 60Hz ---- 10 ---- W
Dimensions 483×102×44  ---- ---- ---- mm