DPCAV AV681TX Bedienungsanleitung

AV681TX-Kit, Rev B Page 1 © Nov-03-2008

AV681TX 5.8GHZ A/V TRANSMITTER KIT

Rev-B Hardware

INTRODUCTION

This 5.8Ghz 100mW A/V transmitter kit provides a custom printed circuit

board set and quality electronic components. All you need to add is an

antenna of your choice and about three hours of your time.

NOTICE: This kit involves precision SMD soldering and it is NOT intended for

beginners to assemble. It is suitable for amateur radio hobbyists and RF

technicians. The builder must have good quality soldering tools, an anti-static

work environment, and electronic assembly experience.

Note: This transmitter will require a ham radio license for hobby applications. Some

countries may prohibit use. Please consult your government’s spectrum regulations

before using this device.

ILL OF

ATERIALS

QTY DESCRIPTION DESIGNATOR NOTES

==== =================== ============ =========================

3 .1uF Cap C1, C3, C8 0805 pkg.

4 47uF 6V Cap C6, C7, C20, C22 Observe polarity. 3528-21pkg.

1 47uF 16V Cap C21 Observe polarity. 6032-28 pkg.

3 330uF Cap C2, C4, C5 Observe polarity. 7343-31 pkg.

3 3.3K Resistor R1, R2, R3 0805 pkg.

1 22uH Inductor L1 3225 pkg.

1 DL4001 Diode D20 Observe polarity. MELF pkg.

2 KF50BDT U20, U21 TO-252 pkg.

1 DIP Switch S1 SOIC Package

1 SMA-RP Connector N/A Antenna connector

1 Tall Post Header, 4-pin PCB Assy Cut into one 2-pin and two 1-pin

20" 2-Cond Zip Wire DC-IN Red/Black, 26AWG

10" 3-Conductor Wire AV-IN Brown/Red/Orange, 32AWG

1.75" Heatshrink, 2" Size N/A See text

1 Double-sided foam pad N/A See text

1 AWM681TX Module #AWM681TX Static sensitive, handle with care.

1 Printed Circuit Board Set PCB 2-piece set

The following accessories are available separately. You may use our recommendations or any

suitable equivalent:

AVAILABLE ACCESSORIES

5.8GHz 8dBi Patch Antenna, #HG5808P-SMA and Coax Cable #CSR400 or #CSR316.

5.8GHz 5dBi Patch Antenna, #AWM5.8ANT

5.8GHz 4dBi Dipole Antenna, #ANTDRP-5.8.

5.8GHz 2dBi Dipole Antenna, #ANTTRP-5.8.

Tiny-Mic Amplified Microphone, #MIC-001

AV681TX-Kit, Rev B Page 2 © Nov-03-2008

Figure 2, Side

Figure 3, Side

ASSEMBLY INSTRUCTIONS

1 GENERAL NOTES

1.1 These instructions are for the Rev-B hardware release. Before starting, be sure

to confirm your kit is a Rev-B.

1.2 The top and bottom sides of the two PCB’s are labeled with a circled number

(e.g.,

âãäå

). The instructions will reference the numbered side that is being

assembled.

2 SIDE

ãã

ã,

COMPONENTS: See Figure 2.

2.1 Install C20 and C22 (47uF/6V caps).

2.2 Install C21 (47uF/16V cap).

2.3 Install D20 (diode).

2.4 Install U20 and U21 (Vreg IC).

3 SIDE

ää

ä,

COMPONENTS: See Figure 3.

3.1 Install C1 and C3 (.1uF caps).

3.2 Install C6 and C7 (47uF/6V caps).

3.3 Install C2, C4, and C5 (330uF caps).

3.4 Install L1 (inductor).

3.5 Install S1 (4-position switch). Orient it so that the

“1234" text is at the front edge.

AV681TX-Kit, Rev B Page 3 © Nov-03-2008

Figure 4, Side

Figure 5, Stand-Off Posts

4 SIDE

åå

å,

COMPONENTS: See Figure 4.

4.1 Install R1, R2, and R3 (3.3K resistors).

4.2 Install C8 (.1uF cap).

5 SIDE

ää

ä,

POST INSTALLATION: See Figure 5.

5.1 Carefully cut the standoff post header so that

you have one piece that is 2-pins and two pieces

that are 1-pin.

5.2 Install the 2-pin

POWER

post at J1.

5.3 Install a 1-pin

GND

post at the hole next to C1+ .

5.4 Install a 1-pin

GND

post at the hole next to C7+.

6 SIDE

ãã

ã,

POWER CABLE INSTALLATION AND VREG TEST.

6.1 Install a 10-inch (25cm) piece of Red/Black Zip cable to the DC-IN (Red =

Mark it “

6.5-8.5VDC BAT-IN

.” As an alternate, install your preferred DC power

cable/connector (such as a female BEC).

6.2 Install a 10-inch (25cm) piece of Red/Black Zip cable to the CAM PWR Output

(Red =

). Mark it “

5VDC @150mA CAM-OUT

.”

6.3 Visually inspect side

for assembly errors and solder issues. Correct all

problems before proceeding.

6.4 Temporarily apply power (6.5VDC to 8.5VDC) to the DC-IN cable. Using a digital

voltmeter, verify 5.0VDC (±0.15V) at the P1 pads and the CAM-PWR cable.

AV681TX-Kit, Rev B Page 4 © Nov-03-2008

Figure 6, RF Module Installation

Figure 7, SMA-RP Installation

7 RF MODULE INSTALLATION: See Figure 6.

7.1 Install the AWM681TX module. The pin side will be slightly raised above the

PCB and the RF input end must be mounted flush. See Figure 6 for details.

To assist in soldering the module, temporarily slide on the SMA-RP connector to

act as a clamp (but do not solder it). Once the module is correctly positioned,

solder its ten pins and four mounting tabs at the corners. Remove the SMA-RP.

Note: If the module does not sit correctly on the PCB, per Figure 6, then it may

be necessary to file its metal mounting tabs.

8 SMA-RP INSTALLATION: See Figure 7.

8.1 Slide the SMA-RP connector onto the RF

output. Do not allow the connector’s

center pin to short to the module’s metal

case (allow 50 mils clearance).

8.2 Carefully solder the center pin and all

four ground legs. Clean off ALL flux,

even if no-clean solder was used. Do a

visual inspection for solder shorts (do not

use an ohmmeter).

8.3 If the RF module is expected to be used

in an application that has vibration then it

is helpful to solder two diagonal corners

of the RF module’s top tin lid to the tin

metal base. This will help prevent video

noise.

AV681TX-Kit, Rev B Page 5 © Nov-03-2008

Figure 8, A/V Cables

9 SIDE

åå

, A/V CABLE INSTALLATION: See Figure 7.

9.1 Install the 3-wire cable to the AV-IN pads as follows:

Brown= G(A/V G

)

Red = L(L

EFT

UDIO

) or R(R

IGHT

UDIO

)

Orange = V(V

IDEO

)

9.2 If a line-level microphone will be used (our Tiny-Mic is highly recommended) then

install it at the MIC pads as follows:

Mic Audio = S

5V Power = +

Mic Gnd = G

Note: The MIC input feature uses the right audio channel. Do not use the right

channel on the A/V-IN input if a Microphone is installed on the MIC input.

AV681TX-Kit, Rev B Page 6 © Nov-03-2008

Figure 9, Foam Pad

Figure 10, Heatshrink

10 FINAL ASSEMBLY: JOIN THE TWO PCB’s TOGETHER

10.1 Using an approved PCB cleaner, remove the flux

from ALL soldered connections. Flush trim all the

component leads from sides

and

10.2 Inspect your work. Now is the time to find errors --

once the boards are joined it will be very

inconvenient to do this.

10.3 See Figure 9. Cut the double-sided foam pad in

half. Stack the two pieces together to form a thicker

pad. Install the pad on the RF end of the Airwave

module.

10.4 Stack the two PCB’s with sides ãand äfacing each other. The four posts will

mate with the corresponding holes on side

10.5 While lightly squeezing the foam pad end, ensure that the

two boards are parallel and close together. There should

be a slight air space between the Vreg ICs’ surfaces and

the top of the Airwave module. Hold this position while

you solder the four posts. Trim the excess leads.

10.6 See Figure 10. Slide a 1.75 inches (45mm) long piece of

heatshrink over the transmitter so that it covers the end

with the exposed electronics. About 0.25 inches (6mm)

should hang over the end that has all the wires. Airflow is

needed so do NOT totally cover the end. Use a heat gun

or hot hair dryer and neatly shrink the tubing. Matches

and lighters are not recommended.

11 FREQUENCY CONFIGURATION

11.1 The DIP switch is used to change the transmitted frequency. The transmitter and

receiver must both be on the same channel. The three switches are set as

follows:

CH MHz SW1 SW2 SW3

OFF = switch open

(Front position)

ON = switch closed

(Back position)

1 5740 ON ON ON

2 5760 ON ON OFF

3 5780 ON OFF ON

4 5800 ON OFF OFF

5 5820 OFF ON ON

6 5840 OFF ON OFF

7 5860 OFF OFF ON

AV681TX-Kit, Rev B Page 7 © Nov-03-2008

NOTICE

Digital Products Company, or their distributors, have no control over the assembly and use of this

A/V RF system. As such, no liability may be assumed, nor will any liability be accepted, for any

damages resulting from the use of this product. Under no circumstances will the buyer be entitled to

consequential or incidental damages. By act of using it, the buyer accepts all resulting liability.

12 AUDIO CONFIGURATION

12.1 DIP Switch position four is used to control a special audio feature. When ON

(SW-4 closed), it will bridge the left and right audio channels together. This is

used to transmit mono sound with both channels. For independent audio

channels be sure to turn it OFF (SW-4 open).

13 TECHNICAL INFORMATION

For complete technical information, please consult the AWM681TX data sheet

(available from dpcav.com’s web site) and the attached schematic.

1 2 3 4

4321

1 1

5.8GHz A/V Transmitter

AV681TX B

Title:

Size:

Date:

Revision:

Sheet of

Letter

DPC A/V

AUDIO VIDEO

www.dpcav.com

JAN-29-2008

2008

GND

N/A

2SW2

AUD-L

SW1

4SW0

5AUD-R

6VID

GND 11

GND 13

ANT 12

VCC 9

BYPASS 10

AWM681TX1

HDR2P

+C2

330uF

C21

47uF 16V

+C22

47uF 6V

6.5VDC MIN

8.5VDC MAX

1OUT 3

GND

U21

KF50BDT

D20

DL4001

330uF

DC-IN

PWR

AIRWAVE AWM681 TX

.1uF

HDR4P

AUD-R

AUD-L

VID-IN

3.3K

22uH

3.3K

GND

SW DIP-4

VCC

C6 47uF 6V

C7 47uF 6V

C5 330uF

2P1

HDR2P

GND1 GND2 GND3

GND PADS

.1uF

VCC

2CAM

HDR2P GND4

GND1V GND2V GND3V

GND PADS GND4V

+C20

47uF 6V

1OUT 3

GND

U20

KF50BDT

CAMERA POWER (5VDC)

CAM5+

TX5+

BIT2

BIT1

BIT0

MIC

HDR3P

VCC

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