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C A I R O |
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Communications Audio Interface for Remote Operations |
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DATA CARD |
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C A I R O |
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Communications Audio Interface for Remote Operations |
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DATA CARD |
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CAIRO & CAIRO-8 Pin-Core-Signal Table |
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DIN pin |
Cable Core |
Audio Interface | Summary |
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1 |
Blue |
Primary Audio | Rig's usual single-ended speaker output; e.g. 2 W for 8 ohms |
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4 |
Red |
PTT | Rig's usual PTT control, will get metallic contact to ground for Tx. |
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2 |
GREY |
Earth-Screens | Ground return for all signals, except microphone (c.f. pin-5) |
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5 |
Yellow |
Mic.-Low (-) | isolated throughout, may be grounded ONLY at Rig |
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3 |
White |
Mic.-High (+) | superimposed d.c. (@ ~ 5V) as phantom powering for electrets |
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7 |
Brown & Black |
d.c.-Power | 13.8 V (nominal) at 1 A (fused 1.25 A) controlled by Rig's ON/OFF |
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6 |
Violet |
Audio-Line | CAIRO-8 = 1Vpk (707 mV rms) fixed-level |
| Secondary Audio | CAIRO = remote-end 'duplicate' of pin-1 | ||
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8 |
Green |
Squelch | metallic-contact closure (to ground) for squelch broken/open state |
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CAIRO Hardware & Accessories Table |
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Remote Operations |
CAIRO(Line-signals @ pins 1 - 5) |
| Sockets | DIN-7 types throughout |
| Plugs | 3-, 5-, or 7-pin DIN (diecast body) types, as required |
| Line (LC) | 4-core, individually-screened cable; e.g. 4 x 7/0.1mm, or near equivalents |
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Accessories |
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| Microphones | nominal 600 ohms, -65 dBV sensitivity (@ 1 KHz), isolated and screened; pins 3 & 5 |
| Speakers | 8 ohms or higher; pin-1 |
| Earphone(s) | 30 ohms or higher; Primary (left), pin-1; Secondary (right), pin-6 |
| PTTs / TTTs | metallic-contact (press-switch) closure for Tx condition; pin-4 |
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Hardware |
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| Orange Reel | DIN-5 plug -> ~ 40 m of Line -> 2 (or 3) DIN-7 chassis sockets on side panel |
| Extension Lead | DIN-5 plug -> ~ 2 m of Line -> single DIN-7 in-line ('free') socket |
| Distribution | Single- or Dual-Operator Outlet Boxes; paired sockets and volume control(s) |
| Loose-Tail | DIN-5 plug -> ~ 1m of Line -> 5-pin Audio [A5] line-socket >-> A5 chassis plug |
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Augmented Operations |
CAIRO-8(= CAIRO + PALS @ pins 6, 7, 8) |
| Sockets | DIN-8 types, all signals strictly honoured from host rigs to local active modules |
| Plugs | DIN-8 types (or the DINs of basic CAIRO) |
| Cable (C8L) | 8-way overall screened; e.g. 8 x 7/0.2mm, (2 cores for '12V', pin-7) |
| Loose-Tail | DIN-8 plug -> ~ 1 m of C8L -> 8-pin Audio [A8] line-socket >-> A8 chassis plug |
 03/07/09 |
CAIRO |
CAIRO-8 |
Talk-Through |
Supplementary Material |
 ©G8CQH |
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