Mic Wiring Diagrams

Article by m0ysu

Microphone wiring can be a real pain if you aren’t sure how to work out which wire goes where. On this page I will try to explain the basics and also give you the wiring positions for most CB radio’s

Basic Mics – These consist normally of three coloured wires and a braid/screen. The braid is the common wire for the TX/RX/Mod and is normally twisted around the modulation wire. If you get this in the wrong place you will be fighting an uphill battle. 4 pin mic sockets are about the easiest to sort out, the 5 pin din can be very hard to wire as there’s not much distance between the pins and can “short out” easily. Normally when I’m wiring 5 pins I put a sleeve on each wire to prevent this.
Back to 4 pin. Put the plug into the radio and look at the solder pins. Two of these pins will make the radio receive (sound) so find out which two these are by shorting a piece of wire across the pins with the radio on until you find the two that make sound.  One of these pins will also be common to making the radio TX so that pin will be where the braid is soldered to. Once that is soldered on its pin touch each coloured wire on the other pin until the sound returns. Solder that coloured wire on the other pin. Next you need to find the TX pin. With the mike key depressed touch the other two wires breifly on the TX pin until you find the one that makes it TX. Solder that wire to the TX pin. Finally the modulation wire will go on the remaining pin. Often the modulation wire is the yellow one or it has the braid wrapped round it.

 
PWR Mics – These normally have 4 coloured wires and a braid. More often than not the black and braid twist together and go on the earth pin. The blue goes on the Receive pin. Sometimes but less often the blue and braid go together and the black is RX.
Below I’ve made this a bit easier so you shouldn’t have to do the above unless the wires of the mic do not correspond with the below.

ALTAI PWR MIC – black/braid= earth, red=RX, white=TX, Yellow=MOD
ASTATIC – blue/braid=earth, black=RX, red=TX, white=MOD, Yellow=Spare
SIRTEL ECHO MIC CBE 2002 – black/braid=earth, blue=TX, white=RX, red=MOD
007 POWER MIC – brown/braid=earth, green=RX, white=TX, blue=MOD
SADELTA EC 980 – braid=earth, green=RX, brn=TX, white=MOD
                              or braid=earth, black=RX, blue=TX, white=MOD

OLDER MAKE OF CB   followed by plug reference

ACADAMY – 3
ALPHA 4000 – 13
AMSTRAD 900/901 – 1
ATRON CB 507 – 2
AUDIOLINE (ALL) – 2
BARRACUDA – 15
BINATONE 5 STAR/ROUTE 66/ BEAM BREAKER – 1
BREAKER 40FM CEPT – 1
CB MASTER 2040/2080 – 8
CHEIZA – 3
COBRA 146GTL/148/19/21 – 2
COLT 210/295/355/720 – 8
COLT 320/444/510/870/EXCALIBUR – 1
COMMTEL – 3
COMMTRON V111/CXX – 8
COMMUNICATOR – 1
DNT M40/B40 – 11
DOMINICO CONVOY 1 – 1
ELFTONE – 3
EUROSONIC EURO 2 – 5
FALCON FCB1281 – 1
FIDELITY 1000/3000 – 3
FIDELITY 2000/2001 – 1
FORMAC 88/120 – 1
GE 3-5804/3-5805 – 12
GECOL GT858B – 3
GRANDSTAND BLUEBIRD – 9
GRANDSTAND GEMINI – 10
GRANDSTAND HAWK – 1
GRANDSTAND HOMEBASE/WAGNER – 2
HAM CONCORD 2 AND 3 – 1
HAM EXPLORER – 1
HAM INT. UK/JUMBO/MULTIMODE/VIKING – 1
HARRIER CB/CBX/CBHQ – 1
HARVARD 400M – 5
HARVARD 402MPA – 1
HARVARD 420M – 1
HARVARD GOOD BUDDY – 4
HY-GAIN 5 – 1
ICOM ICB-1050 – 1
JWR MK2 – 1
JAWS MK2 – 8
KRACO KCB4030 – 1
KRACO KCB4004 – 2
LCL 2740 – 11
LAKE MANXMAN – 3
LEGIONAIRE – 4
MAXCOM 4E/20E/21E – 8
MAXCOM 30E – 1
MIDLAND 2/3/4/5/6/7001 – 1
MIDLAND 805 (PORT A PAC) – 14
MIDLAND 099 – 8
MURPHY CBH1500 HOMEBASE – 6
MUSTANG 1000/3000 – 1
NATO 2000/NATO 40FM – 1
NEW FORMAC 88 – 8
PEGASUS 7 – 1
PLANET 2000 – 1
PRESIDENT ADAMS/ANDREW J/AR144/AX144/DWIGHT D – 2
RADIOMOBILE CB201/202/205 – 1
REALISTIC TRC2000/2001/2005 – 12
ROTEL RVC 220/230/240 – 1
SAPPHIRE X2000 – 3
SAPPHIRE X4000 – 8
SCOOPER MKY440/550E – 2
SERPENT UK4000 – 1
SHOGUN (OLD) – 7
STALKER (ALL) – 2
SUN 401 – 1
SUPERSTAR 120/360/3900 – 2
SUPERSTAR 2000 – 1
TOKAI – 3
TRISTAR 727/747/777/797 – 1
UNIDEN UNIACE (ALL) – 2
YORK 861/863/869 – 1

Article by m0ysu originally available at m0ysu.com/micwiring.html