C A I R O

Communications Audio Interface for Remote Operations

DATA CARD

 

 

CAIRO & CAIRO-8 Pin-Core-Signal Table

DIN pin

Cable Core

Audio Interface Summary

1

Blue

Primary Audio Rig's usual single-ended speaker output; e.g. 2 W for 8 ohms

4

Red

PTT Rig's usual PTT control, will get metallic contact to ground for Tx.

2

GREY

Earth-Screens Ground return for all signals, except microphone (c.f. pin-5)

5

Yellow

Mic.-Low (-) isolated throughout, may be grounded ONLY at Rig

3

White

Mic.-High (+) superimposed d.c. (@ ~ 5V) as phantom powering for electrets

7

Brown & Black

d.c.-Power 13.8 V (nominal) at 1 A (fused 1.25 A) controlled by Rig's ON/OFF

6

Violet

Audio-Line CAIRO-8 = 1Vpk (707 mV rms) fixed-level
Secondary Audio CAIRO = remote-end 'duplicate' of pin-1

8

Green

Squelch metallic-contact closure (to ground) for squelch broken/open state

CAIRO Hardware & Accessories Table

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

Accessories

 
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

Hardware

 
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

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

1
Remote Operations

2
CAIRO Basics

3
CAIRO-8 Basics

4
Raynet Packet

5
CAIRO Installations

6
CAIRO-8 Relays

7
CAIRO Relays

8
Relay Installations

Summary Configuration

Data Card

Handy Hints

Users