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G8MNY  > ATV      25.05.18 10:59l 62 Lines 2571 Bytes #26 (0) @ WW
BID : 21130_GB7CIP
Read: GUEST
Subj: SCART Video Connections
Path: IW2OHX<IW0QNL<JH4XSY<JE7YGF<GB7CIP
Sent: 180525/0953Z @:GB7CIP.#32.GBR.EURO #:21130 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : ATV@WW

(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

Not all pins have to be connected. There are different standards....

Type U (universal) - provides connections to all 21 pins.

Type V (video) - provides all connections excluding audio pins (3,1,6,2&4).

Type C ( composite video & audio ) - provides all connections excluding
       RGB Video & Blanking pins (15,13,11,9,7,5,16&18).

Type A (audio) - provides all connections excluding Video pins
                 (19,20,17,15,13,11,9,7,5,16&18)
       ________________________________
SOCKET \ 20 18 16 14 12 10  8  6  4  2 
 VIEW 21 19 17 15 13 11  9  7  5  3  1
        

Pin  Name     Description            Size of Signal          Impedance
 1   AOR      Audio Out Right          0.5V RMS                 <1k
 2   AIR      Audio In Right           0.5V RMS                 >10k
 3   AOL      Audio Out Left + Mono    0.5V RMS                 <1k
 4   AGND     Audio Ground
 5   BGND     RGB Blue Ground
 6   AIL      Audio In Left + Mono     0.5V RMS                 >10k
 7   B        RGB Blue In              0.7V Pk                    75
 8   SWTCH    Audio/RGB switch/16:9  0-2V TV / 5-8V AV 4:3 / 9.5-12V AV 16:9
 9   G GND    RGB Green Ground
10   CLKOUT   Data 2: Clockpulse Out          (Unavailable ??)
11   G        RGB Green In             0.7V Pk                    75
12   DATA     Data 1: Data Out        (Unavailable ??)
13   R GND    RGB Red Ground
14   DATAGND  Data Ground
15   R        RGB Red In/Chrominance   0.7V pk 0.3V burst         75
16   BLNK     Blanking/Comp-RGB        1-3V RGB, 0-0.4V Composite 75
17   VGND     Composite Video Ground
18   BLNKGND  Blanking Signal Ground
19   VOUT     Composite Video Out / Lum Y  1V Pk                  75
20   VIN      Composite In / Lum Y         1V Pk                  75
21   SHIELD   Ground/Shield (Chassis)

Cables with 1 overall screen only usable @ 50cm MAX length & will suffer some
crosstalk.
Some cables have 30 lapped screened AF cable for video & give colour problems
as the screen is quite in inductive at 4.3MHz, proper full mesh crossed braided
screens should be used for all 75 signal cables.
             
"S" input 15+20, crosstalk @ 4.43MHz in log cables causes fine patterning!

WARNING
Some VCRs (expensive JVCs) blow internal pcb fuse if the SWITCH tally wire is
shorted to ground! So watch those floating around bare screens inside the SCART
plug! 


Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


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