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Main / Encoders, transcoders / PMFE-3301M
| PMFE-3301 series PAL-to-SECAM transcoders |
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:
| ADC |
10-bits at 27 MHz |
LUMA frequency response |
| PAL |
0.5dB up to 5.8MHz |
| return loss |
better than 40dB at 4.43MHz |
| diff phase |
less than 0.2° |
| diff gain |
less than 0.2% |
| SNR, weighted |
better than 65dB |
| field tilt |
less than 0.5% |
| 2T K-factor |
less than 0.5% |
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).
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