Optional vertical interval test signals (pulse and bar) and line 23 wide-screen signalling are incorporated; these may be configured using the supplied software. The PAL colour encoding is mathematical (meaning the colour subcarrier frequency has exactly the correct relationship to the synchronising pulses) thus minimising subcarrier visibility and guaranteeing compatibility with all 625-line PAL equipment.
The generator is supplied with a 'plug top' 230 Volt AC mains adaptor, or may alternatively be powered from a 9-12 Volt regulated DC supply. To program the generator a 9-way D-type serial extension cable (male-female) is required; this is not supplied. Suitable cables are Maplin order code VD73Q or CPC order codes CSLEAD76 (2m length) and CS9115 (5m length).
Dimensions (excluding connectors) Approximately 130x65x25 mm Weight Approximately 150 grams Power requirements +9 Volts to +12 Volts at approximately 150 mA Power connector Concentric, 2.1 mm (centre +ve) Video output Baseband composite PAL, NTSC or monochrome. Video level 1 Volt pk-pk ±10% into 75 ohms Output impedance 75 ohms ±10% Line standard 180, 405, 441, 625 or 819 lines, 25 Hz; 525 lines 29.97 Hz. Video connector 75 ohm BNC socket Storage format 12 MHz sampling, 8-bits linear coding Storage capacity One still frame (8-field PAL sequence) Programming connector 9-pole D-type socket (female)
Note that for operation at 525 lines an internal link must be changed. See the programming section for details.
180 lines 405 lines 441 lines 525 lines 625 lines 819 lines Field frequency 25 Hz 50 Hz 50 Hz 59.94.. Hz 50 Hz 50 Hz Frame frequency 25 Hz 25 Hz 25 Hz 29.97.. Hz 25 Hz 25 Hz Interlace 1:1 2:1 2:1 2:1 2:1 2:1 Active picture 169 lines 375 lines 383 lines 485 lines 575 lines 737 lines Field blanking 11 lines 15 lines 29 lines 20 lines 25 lines 41 lines No. of broad pulses 1 per frame 8 per field 8 per field 6 per field 5 per field 1 per field Broad pulse width 200 µs 41.2 µs 36.3 µs 27.1 µs 27.3 µs 20.0 µs Line frequency 4500 Hz 10125 Hz 11025 Hz 15734.3 Hz 15625 Hz 20475 Hz Front porch 2.2 µs 1.7 µs 1.0 µs 1.5 µs 1.6 µs 0.5 µs Line sync 20.0 µs 9.0 µs 9.0 µs 4.7 µs 4.7 µs 2.5 µs Back porch 2.2 µs 7.8 µs 6.3 µs 4.5 µs 5.7 µs 5.0 µs Active line time 197.8 µs 80.3 µs 74.3 µs 52.9 µs 52.0 µs 40.8 µs Video/syncs ratio 75/25 70/30 70/30 100/40 70/30 75/25 Colour subcarrier (MHz) 2.65781250 (NTSC) 3.57954545 (NTSC), 3.57561189 (PAL-M) or 4.43361638 (NTSC 4.43) 4.43361875 (PAL) or 3.58205625 (PAL-N)
The programming software is supplied with the generator on floppy disk (or on CD-ROM to special order), or can be downloaded from the R.T.Russell web site.
Once installed, the programming software can be run in a number of ways:
|Colour Bars 100||100% full-frame colour bars.|
|EBU bars*||Plain colour bars as specified by the European Broadcasting Union.|
|Frequency sweep||A luminance (0-6 MHz) and chrominance (0-3 MHz) frequency sweep, with markers.|
|Grille*||A regular grid of lines for checking linearity and convergence.|
|Old Test Card||A facsimile of the electronic test card published by the BATC in the ATV Handbook of 1981.|
|Pluge||The pattern produced by the BBC's Picture Line Up Generator Equipment.|
|Pulse and Bar||A full-frame 2T luminance pulse, composite chrominance pulses and luminance bar.|
|RTR Test Card||The default test card which is programmed into the generator as supplied.|
|Safe Area 4x3*||An image showing the safe area to which important information like captions should be restricted.|
|Sawtooth*||A luminance ramp, for testing linearity and quantising distortion.|
|SMPTE bars*||A pattern specified by the Society of Motion Picture and Television Engineers.|
|Tartan bars*||A pattern of coloured blocks for checking saturation.|
|Test Card C||The famous monochrome test card, digitally remastered.|
|Test Card D||Another famous black and white Test Card.|
|Test Card F*||Possibly the best-known test card of them all. ©BBC, Ofcom & Intellect 1967.|
|Wols 4x3 Test Card*||A 4x3 colour test card designed by Peter Vince.|
|Wols 16x9 Test Card*||A 16x9 colour test card designed by Peter Vince.|
The images marked * are not actually supplied with the Test Card Generator, but are automatically downloaded from the internet as required. If you use a 'dial-up' internet service you will be prompted to make a connection.
The Colour Test Card Generator, its programming software and the incorporated test card image are the Copyright © 2003-2005 of R. T. Russell.
Test Card F is the Copyright © 1967 of the British Broadcasting Corporation, the Office of Communications (formerly the Independent Television Commission) and Intellect (formerly the British Radio Equipment Manufacturers' Association). It may not be reproduced for any other purpose.