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Main / Encoders, transcoders / PMFE-3301M

PROFLEX™ PMFE-3301M series PAL-to-SECAM transcoders provide the digital convertion of the input PAL (625/50) signal into the SECAM (625/50) with 12-bits precision. The PMFE-3301M module occupies one slot in a PROFLEX rack.

Technical specifications

• Input:
  PAL, 1v at 75 Ohm
• Outputs:
  Two SECAM outputs, 1v at 75 Ohm

Converter characteristics

PAL comb-filter decoding:

Encoding

SECAM encoding is performed digitally with 12-bits precision.

LUMA channel:

• SECAM mode frequency response (adaptive notch filter ON) relative to 0,5MHz at 420mV amplitude:
  • 1,0 MHz: ±0,1 dB
  • 2,0 MHz: ±0,25 dB
  • 3,0 MHz: ±0,5 dB
  • 4,0 MHz: –6±2 dB
  • 4,286 MHz: –16±2 dB
  • 4,8 MHz: –3±1 dB
  • 5,8 MHz: ±0,5 dB
• 2T K-factor: less than 1,5%>
• SNR: better than 63 dB
• nonlinearity: less than 1%

CHROMA channel:

• color difference signal bandwidth: 1,5 MHz
• unmodulated subcarrier frequency:
  • "red" TV line: 4406,25 ± 1,5 kHz
  • "blue" TV line: 4250,00 ± 1,5 kHz
• subcarrier nominal deviation:
  • "red" TV line: 280 ± 5 kHz
  • "blue" TV line: 230 ± 4 kHz
• subcarrier maximum deviation:
  • "red" TV line: 350 ± 10 kHz
  • "blue" TV line: 350 ± 10 kHz
• clipping level subcarrier deviation:
  • "red" TV line: -506±15...+350±10 kHz
  • "blue" TV line: -350±10...+506±15 kHz
• unmodulated subcarrier amplitude:
  • "red" TV line: 214 ± 20 mV
  • "blue" TV line: 167 ± 16 kHz
• color synchronization signal amplitude:
  • "red" TV line: 540 ± 40 mV
  • "blue" TV line: 500 ± 40 mV
• GOST 7845-92 compliant LF and HF pre-emphasis
• LUMA-to-CHROMA skew: less than 30ns

General description

PMFE-3301M simplified schematics

PMFE-3301M rear panel

PMFE-3301M frontal panel

Controls

• MODE - selects a menu entry for editing
• DOWN/UP – edit a currently selected parameter
  The simultaneous depression of the UP and DOWN buttons resets a selected parameter to it's default value

Indicators

The LED on the frontal edge of the board:

• INP - input signal presence indicator

The main indicators panel:

• INP – lit when input mode is being selected
• OUT – lit when output mode is being selected
• BLCK – lit when the black level is being preset for the composite video. The ±70mV offset is represented as ±99 units
• CHR – lit when the chrominance amplitude is being preset for the composite video. The +5/-13dB range is represented as ±99 units
• GAIN – lit when the luminance amplitude is being preset for the composite video. The +1.8/-2.5dB range is represented as ±32 units
• VBI – lit when the VBI contents (VITS, VITC, Teletext, etc) pass-through mode is being preset:
  • PAS – VBI contents pass-through is enabled (main input to main output)
  • BLA – VBI contents is blanked
  • REF – VBI contents is restored from the REF input signal
• VITS – lit when the built-in VITS generator is enabled, lines 17, 18, 330 and 331
• TEST – lit when the built-in test-pattern generator is being preset:
  • oFF – disabled
  • brh – vertical color bars ON
  • bru – horizontal colo bars ON
  • L 1, L 2, L 3, L 4 – corresponds to the test-pattern I , II , III and IV of VITS being inserted into the active lines

The remote control and management from a PC

All the “PROFLEX” modules are remote controllable from a PC. This facility is available if a rack is fitted with a CPU module (ordered separately).