Q2 Wiring by Harold Dirks Quickie 2 N32DK

When building the Q2 during the late 80s and early 90s, we decided to incorporate electrical and electronic equipment like cockpit, navigation, and landing lights; as well as wingtip strobes, radio, intercom, and cockpit speaker. Wiring for all of this, in addition to the normal wiring for the battery, engine starter, ignition, and panel instruments required a detailed plan to implement it all. This article features the wiring diagrams I prepared for our Quickie 2 N32DK. The article is not meant to be a do-it-yourself lesson; it only describes the kind of paperwork that should normally be prepared to document what is done to a plane in an electrical and electronic way. After retiring shortly before the wiring phase of the Q2 build, I had plenty of time to devote to this project. And my electronics and computer engineering background enabled me to easily design, build, and install a lot of items that others might find expensive to buy and pay others to install. I started by using the drawing capabilities of Microsoft Word to produce several drawings that are Integrated into the four Diagram Pages given below. Diagram Page 1 shows the DC power distribution. This diagram is separated into the following five sub-sections of the plane: baggage compartment, engine, instrument panel, firewall, and cockpit. In some cases, the wiring goes directly from one sub-section to another. In other cases the wiring goes through multi-pin Molex connectors, which allow sub-sections like the instrument panel to be easily disconnected from the wiring and removed from the plane. Note that the wires used for the magnetos and radios are shielded to help prevent radio noise. Diagram Page 2 shows the pin connections for the Molex connectors and the radio wiring. The radio, a NARCO ESCORT II nav/com unit, is mounted in the instrument panel. The radio has two dipole antennas. The Nav antenna has a V-shape made from flat copper strips that are built into the right side canard. Our new Com antenna is made from copper tubing and is located inside the rear fuselage. A third Com antenna was originally built into the vertical tail, but is now only available for a hand-held radio. Diagram Page 3 shows the speaker box that is located behind the seatback bulkhead. The box contains the speaker and the amplifier which provides the power to drive the speaker. The amplifier is my own design and is built with parts obtained from the Radio Shack store. The speaker is normally only used on the ground to listen to the radio without wearing a headset. Diagram Page 4 shows the intercom which is also my own design and is built with Radio Shack parts, except for the headphone jacks, which are regular aircraft parts. Both the pilot’s and co-pilot’s headphones connect to the intercom, which has volume and ON/OFF controls for each pilot. The intercom is sound-operated, with a control for adjusting the turn-on threshold level. There also is a set of headphone jacks mounted on the instrument panel for use during solo flight when the intercom is not needed. (The article text and several pictures of the installed units continue after the Diagram Pages.)

Diagram Page 1. DC POWER WIRING DIAGRAM (Including Magnetos and Magneto Control Switches).

BATTERY

ENGINE

STARTERSTARTER MOUNT LUG

STARTERSOLENOID

FIREWALL

#16

#6

ALTER- NATOR

BLKYEL

YELRED

REGU-LATOR 12V

BAGGAGE COMPARTMENT

L

RMAG- NETOS

A

B

F

INSTRUMENT PANEL

SPEAKER AMPLIFIER

6 42

3

1

#16

MASTER SOLENOID

#16

#6

#6

#6

#6

1110

LANDINGLIGHTS

STROBEPOWER UNIT

#14

PANELLIGHTS

C

#6

#16

NAV LIGHTS

R

L

COCKPIT

FUEL PUMP

5

E

MSTRSW

25

25

GND STUD

AMPS

CABINHEAT

D

7

HEADTANKSND

8

MAINTANKSNDR

MAINTANK

HEADTANK

GAS GAUGES

5

START SW.

OFF

LO HI

TURN & BANK

HOBBS

OIL PRESS SWITCH

WARN LAMP

MAGNETO SWITCHES

L R

1/4A

TACH

NOTE: Connector pins A to F are on a MOLEX Large-Pin plug. Connector pins 1 to 12 are on a MOLEX Small-Pin plug. (See Page 2)

POWER

NAV-COM RADIO

SEE PAGE 2 FOR RADIO WIRING

Diagram Page 2. MOLEX CONNECTORS (View shown is looking at male pins on the non-wiring side of the connector)

MALE

A B

C D

E F

LARGEPINMOLEX

G M

S K

H X

SMALLPINMOLEX

MALESMALLPINMOLEX

1 2 3

4 5 6

7 8 9

10 11 12

MALE

A....Ammeter Plus 1....Right Magneto G....Ground B....Voltage Regulator Plus 2....Magneto Wire Shields M....Microphone (RED) C....Main Ground 3....Left Magneto S....Speaker (RED) D....Cabin Heater 4....Starter Solenoid K....Transmitter Key E....Landing Lights 5....Fuel Pump H....Headphones F....Navigation Lights 6....Master Solenoid X....Spare 7....Header Tank Sender 8....Main Tank Sender 9....Ground To Master Switch 10....Strobe Power Supply 11....Panel Lights 12....Spare

RADIO WIRING (Includes Headset Jacks located on Instrument Panel)

___ 1 2 3 4 5 6 7 8 9 10 11 12 13

NAV-COMRADIO

NOTE: PINS 8 & 10 JUMPERED FOR 14 VOLT OPERATION

SEE NOTENC

NC

MIKE KEY

+14.4 VDC

GROUND

LOW LEVEL AUDIO

HEADPHONE AUDIO

MIKE AUDIO

MIKE / PHONE GROUND

POWERFILTER

SEEPOWERWIRING(PAGE 1)

SH

K

M

G

MIKEJACK

EARPHONEJACK

SHIELDEDCABLESFROM THESPEAKERBOX IN THEBAGGAGECOMPART-MENT

Diagram Page 3 SPEAKER BOX (Located in Baggage Compartment on back side of seatback bulkhead)

SPEAKER

GROUNDSEE PAGE 1

COPILOT PTT

PILOT PTT

+14.4 VOLTSSEE PAGE 1

RADIO PTT

RADIO MICROPHONE

RADIO EARPHONE

GROUND

RADIO LOW-LEVEL-AUDIO (LLA)

TERMINAL STRIPS

WIRE COLORSGROUND (GN/BK)COPILOT PTT (OR/GN)PILOT PTT (BK/VL)+12 VOLTS (RD/BN)RADIO PTT (BN/YL)RADIO MICROPHONE (BN/BL)RADIO EARPHONE (BN/VL)RADIO LLA OUTPUT (BN/OR)AMPLIFIER OUTPUT (BK/YL)

BK=BLACK OR=ORANGEBN=BROWN RD=REDBL=BLUE VL=VIOLETGN=GREEN YL=YELLOW

SPEAKERAMPLIFIERAND AUDIORELAY

RADIO LLATO SPEAKERGROUNDRADIO PTTRADIO MIKEPILOT MIKECOPILOT MIKE

COPILOT PTTPILOT PTT

OFF

TO INTER-COM

POWERSWITCH

5A

STICKPTT

SPEAKER AMPLIFIER AUDIO RELAY

+_LM383

54

3

1

2

+14.4V

C20.22uf

C51000uf

C3470uf

C110uf

C40.22uf

R1220

R22.2

RADIOLLA

VOL.TRIM

SPKR.8

RADIO MIKE (BU/BN)

PILOT MIKE (BK/BN)

RADIO PTT (BN/YL)

COPILOT MIKE (BK/BL)PILOT PTT (BK/VL)

GROUND (GN/BK)

+14.4 V

COPILOT PTT (OR/GN)

++

+

Diagram Page 4 INTERCOM SCHEMATIC DIAGRAM (Intercom located in cockpit on seat-back bulkhead)

2.2K

A1

_

+A2

_

+

A3

_

+C1

_

+

A5+

_

PILOTMIKEJACK

CO-PILOTMIKEJACK

TO +14.4VOLTS

2.2K

10K

10K

0.05f

47K

220K 100K

220K

470pf

470pf

10K

0.05f

+ +

6

2

3

4

5

10

0.05f

220f 220

R

W

BU

BK

GN

XFMR 8KTO 1K CT0.5K USED

150

PILOTPHONEJACK

C2_

+

10K

1M

2.2K

1M

1M

220K470pf

0.05f

100K

100K

SQUELCH

470f+

0.47f

+

3f+ 0.05f

2.2K 100K 100K

TO RADIOPHONES+

2.2f+

OUTLM7812

VR1IN

++12VREG.

2

3 1

PILOT PTT

COPILOT PTT

A1 - A3 = LM324A5 - A6 = LM386C1 - C2 = LM339VR1 = LM7812

A6_

+

33K

10K

+

COPILOTPHONEJACK

10

0.05f

220f

2

3

4

5

60.05

+

COPILOTVOLUME

PILOTVOLUME

2 6

53

1 7

8

10

95

42 16

7

PILOTMike

COPILOTMIKE

386PIN SIDE

324PIN SIDE

OUT 4 14

IN 4 – 13IN 4 + 12GND 11

IN 3 + 10IN 3 – 9

OUT 3 8

1 OUT 1

2 IN 1 –3 IN 1 +

4 V+5 IN 2 +6 IN 2 –

7 OUT 2

339PIN SIDE

OUT 3 14

OUT 4 13GND +

IN 4 + 11IN 4 – 10IN 3 + 9IN 3 – 8

1 OUT 2

2 OUT 13 V+

4 IN 1 –5 IN 1 +6 IN 2 –

7 IN 2 +

GAIN 8BYPASS 7

V+ 6OUT 5

1 GAIN2 IN –

3 IN+4 GND

INTERCOM WIRING

INTERCOM

GROUND (GN/BK)

+14.4 VOLTS

COPILOT PTT (BN/GN)

PILOT PTT (BK/VL)

COPILOT MIKE (BL/BK)

PILOT MIKE (BN/BK)

EARPHONES (BN/VL)

TIP (PTT)

RING (MIKE)SLEEVE (GND)

TIP (EARPHONE)

SLEEVE (GND)

PHONE PLUG

MIKE PLUG

INTERCOM OUTPUT CABLECONNECTS TO THE AUDIORELAY CIRCUIT IN THESPEAKER BOX.

SEE PAGE 3 FORWIRE COLOR CODES

The below picture shows the cockpit lights mounted on either side of the push-pull knob for our aileron reflex control. The intercom control panel is next below and a short distance below that is the rotary, 3-position control that switches power between the speaker amplifier and the intercom. The switch positions are: intercom, OFF, and speaker. The next picture is a close-up view of the intercom control panel. Note that it provides jacks and a volume control for each headset. In the middle a small jack is provided for an audio device such as a tape recorder.

The next photo shows the speaker box location on the back side of the seatback bulkhead in the baggage compartment. The battery and master power solenoid are below the speaker box in their plywood and fiberglass battery box, which is securely installed on the baggage compartment floor next to the tunnel for the rudder and aileron control cables and tubes.

The next photo shows the instrument panel with its gauges, switches, and fuses. The vertical section in front of the control stick contains the push-pull controls for parking brakes, carb heat, fuel valve, and cowl flap. The top of the control stick has a red push-to-talk switch for the radio. The arm rests on each side of the cocktail also have push-to talk switches. The next photo is a close-up of the vertical section to better show the headset jacks for use when the intercom is not needed.