DPCAV AV680RX User manual

AV680RX-Kit, Rev-B Page 1 © Nov-03-2008
AV680RX 5.8GHZ A/V RECEIVER KIT
Rev-B Kit
INTRODUCTION
Thanks to this handy kit, building a high performance 5.8GHz
A/V receiver has never been easier. The kit provides a
custom printed circuit board set and quality electronic
components.
NOTICE: This kit requires assembly and is NOT
recommended to beginners. It is suitable for amateur radio
hobbyists, RF technicians, and engineers. The builder must
have good quality soldering tools, an anti-static work
environment, and electronic assembly experience.
B ILL OF M ATERIALS
QTY DESCRIPTION DESIGNATOR NOTES
==== =================== ============ =========================
4 .1uF Cap C3, C5, C11, C12
4 47uF Cap C1, C2, C7, C9 Observe polarity
4 470uF/10V Cap C4, C6, C8, C10 Observe polarity
2 2.2 1/8W Resistor R4, R5 Red/Red/Black
1 220 1/8W Resistor R4 Red/Red/Brown
3 3.3K 1/8W Resistor R1, R2, R3 Orange/Orange/Red
1 27uH Inductor L1
1 1N4001 Diode D1 Observe polarity
1 Green LED PWR Observe polarity
1 LM2940T-5.0 VReg IC U1
2 3-Pin Vertical Header J5, J6
2 Jumper Shunt J5, J6 Assy See Text for shunt installation
2 1/8" Phone Jack J2, J3
1 4-Pos DIP Switch SW
1 2.1mm DC Jack J1
1 2.1mm DC Plug J1 Assy
1 SMA-RP Connector N/A Antenna RF connector
1 AWM680RX RF Module
8 2-56 x 1/8" Screws Cover Assy
4 2-56 x 7/16" Spacers Cover Assy Female-Female, Top Cover
4 2-56 x 3/16" Spacers Cover Assy Male-Female, Bottom cover
4 Rubber Feet Cover Assy
1 Printed Circuit Board Set PCB 3-piece set (Top/Main/Bottom)
RECOMMENDED ACCESSORIES (available from www.dpcav.com)
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.
5.8GHz 8dBi Log Periodic Antenna, #HG2458-08LPNF (requires #SMA-NM1 and #SMA-015)
3.5mm to RCA A/V Cable, #RSA-002.

AV680RX-Kit, Rev-B Page 2 © Nov-03-2008
Figure 1, Contents of the Kit
Figure 2
Caps, Resistors, and Inductors.
The photo below (Figure 1) shows what is included in the kit:
These instructions are for the Rev-B hardware release. Before starting, be sure to
confirm your kit is identified as Rev-B.
ASSEMBLY INSTRUCTIONS
1 CAPACITORS, RESISTORS, AND
INDUCTORS:
See Figure 2.
9 1.1 Install C3, C5, C11, and C12 (.1uF
caps).
9 1.2 Install C1, C2, C7, and C9 (47uF caps).
9 1.3 Install C4, C6, C8, C10 (470uF caps).
9 1.4 Install R5 and R6 (2.2 ohm resistors).
9 1.5 Install R4 (220 ohm resistors).
9 1.6 Install R1, R2, and R3 (3.3K ohm resistors).
9 1.7 Install L1 (27uH Inductor).

AV680RX-Kit, Rev-B Page 3 © Nov-03-2008
Figure 3, Add the Switches and
Jacks.
Figure 4, Add the Semiconductors.
Figure 5, RF Module Installed
2 SWITCHES AND JACKS: See Figure 3.
9 2.1 Install J1 (DC power jack).
9 2.2 Install SW1 (DIP switch).
9 2.3 Install J2 and J3 (1/8" phone jacks).
9 2.4 Install J5 and J6 (3-pin headers).
3 SEMICONDUCTORS: See Figure 4.
9 3.1 Install D1 (1N4000 diode).
9 3.2 Install U1 (LM2940T-5.0 voltage
regulator IC). Solder its three legs AND
heavy metal tab to the circuit board.
Note: The metal tab must be soldered
to the PCB. As an alternative, it can be
mounted with heat sink grease and
4-40 machine screw (not included).
9 3.3 Install PWR (LED) with the anode (long
lead) in the square pad. The LED must
be mounted elevated so that it pokes
through the hole in the top cover. We
recommend that you solder the LED
after the top cover is installed.
4 RF MODULE INSTALLATION: See Figure 5.
9 4.1 Install the AWM680RX module. The
pin side will be slightly raised above
the PCB and the RF input end must
be mounted flush. If the module does
not sit correctly on the PCB, per
Figure-5, then it may be necessary to
file its metal mounting tabs
Note: The SMA-RP connector is
shown in the photo for reference only.
Do NOT install it at this time.

AV680RX-Kit, Rev-B Page 4 © Nov-03-2008
Figure 6, RF Input
Figure 7, SMA Modification
5 SMA-RP / ANTENNA INSTALLATION: See Figures 6, 7, and 8.
9 5.1 The AWM680RX module’s
antenna input port is shown in
Figure 6 (see red arrow). The RF
ground is the gold colored PCB
trace that is found on both sides of
the input (see green dots).
If you will be using Wi-Fi style
antennas, then go to step 5.2. If
you will be using our economy
PCB patch antenna (#AWM5.8-
ANT), then go to step 5.4.
9 5.2 The provided SMA-RP connector is
compatible with many consumer Wi-Fi style
antennas. But it must be modified before
installation.
As seen in figure 7, cut off the ground leg
that is on the top left side. This is needed
to prevent shorts to the module’s nearby
circuitry (on some modules there is a tiny
SMD component hidden there). Also, the
SMA-RP’s center post needs to be
shortened a small amount so that it does
not short out to the metal case, as shown.
Note: The four green dots in Figure 6 indicate the connector’s ground pin
alignment area. It is important to accurately align the SMA-RP’s center post
conductor over the top side of the module’s RF input trace.
Important: When sliding the SMA-RP onto the assembly, please use care so that
you do not disturb the tiny SMD component that is on the RF input (of some
modules).
5.3 Carefully solder the three ground legs and the center post, as shown in Figure 7.
Ensure the module’s metal enclosure is not shorted to the center post conductor.
Clean off ALL flux, even if no-clean solder was used. Perform a visual inspection
(do NOT use an ohmmeter).

AV680RX-Kit, Rev-B Page 5 © Nov-03-2008
Figure 8, Coax Installation
Figure 9, Covers Installed
9 5.4 Do not use the SMA-RP connector
when installing dpcav.com’s
#AWM5.8ANT economy patch
antenna (available separately).
Instead, directly solder the coax to
the RF port. See Figure 8.
Warning: While soldering, do not
disturb the tiny SMD component
installed on the input pad of some
RF modules.
Ensure the coax braid is not shorted
to the center coax conductor on the module’s RF input. Perform a visual
inspection (do NOT use an ohmmeter).
6 COVER INSTALLATION: See Figure 9.
9 6.1 Using the 2-56 screws, install the four female-female standoffs to the top cover.
9 6.2 Place the top cover over the main PCB and attach using the four male-female
standoffs. The LED should protrude through the hole in the top cover. If the LED
has not been soldered, then now is the time to do that.
9 6.3 Attach the bottom cover using the 2-56 screws.
9 6.4 Apply the four rubber feet to the bottom cover.

AV680RX-Kit, Rev-B Page 6 © Nov-03-2008
Figure 10, Freq & Audio
Config.
7 FREQUENCY AND AUDIO CONFIGURATION: See Figure 10.
9 7.1 The DIP switch is used to change the received frequency. The transmitter and
receiver must both be on the same RF channel. The three switches are set as
follows:
CH MHz SW1 SW2 SW3
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
ON = Switch closed (Down position)
OFF = Switch open (Up position).
Note: The forth DIP Switch (SW4) is NOT used and should be ignored.

AV680RX-Kit, Rev-B Page 7 © Nov-03-2008
Figure 11,
DC Plug
Figure 12, A/V Plug Details
9 7.2 The two audio channels are identified as Left (L) and Right (R). Two plug-in
shunts are used to select which audio channels will appear on the AV-1 and
AV-2 jacks. The top cover is labeled to help you configure the audio.
For example, in the diagram below the audio has been set so that AV-1 uses the
left audio channel and AV-2 uses the right audio channel. Your settings will
depend on how your preferences and application.
AUDIO
CONFIG
1
2
L R
Note: The black areas represent the placement of the configuration shunts for
the example described above.
8 DC POWER AND AUDIO/VIDEO JACK WIRING: See Figures 11 and 12.
9 8.1 The DC input connector is center positive. Using the provided
2.1mm DC plug, create a cable to connect to your battery
supply (6.5VDC to 14VDC).
Traditional AC mains operated DC wall “wart” supplies are not
recommended because they are rarely regulated or filtered. If
AC mains operation is needed then consult with the wall
adapter supplier to ensure it is a voltage regulated design.
9 8.2 There are two audio/video outputs (AV-1 and AV-2). They use a traditional 1/8"
(3.5mm) 3-conductor miniature phone plug (available separately). The pin-out is
shown in Figure 12.
Note: A slight decrease in video brightness may
occur if both A/V jacks are used. If the brightness is
affected too much then it will be necessary to use
only one A/V jack and an external video amplifier
such as our #PLV2-001.

AV680RX-Kit, Rev-B Page 8 © 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.
9 AIRFLOW REQUIREMENT
9 9.1 Airflow to the internal components is required to ensure adequate cooling. Do not
block the airflow.
10 TECHNICAL INFORMATION
For complete technical information, please consult the AWM680RX data sheet
(available from dpcav.com’s web site) and the attached schematic.

1 2 3 4
A B C D
4321
D
C B A
1 1
5.8GHz A/V Receiver
AV680RX B
Title: Size: Date:
Revision: Sheet of
Letter
DPC A/V
AUDIO VIDEO
www.dpcav.com
Copyright:
JAN-29-2008
2008
+
C8 470uF/10V
+
C9 47uF 1
5 2J3
1/8" PHONE
PWR GRN
+
C1
47uF
+C2
47uF
GND
14VDC MAX IN
1OUT 3
GND
2
U1
LM2940T-5.0
D1 1N4001 L1
27uH
+
C10
470uF/10V
VCC
1 2 3
J1 PWR
TP1 TP
AIRWAVE AWM680 RX
+
C7 47uF 1
5 2
J2 1/8" PHONE
+
C6 470uF/10V
VCC
+5F
C5 .1uF
C3 .1uF
R4 220
GND
12
N/A 8
SW2
9
AUD-L
4
SW1
10 SW0 11
AUD-R
3
VID
5
GND 13 GND 15
ANT 14
VCC 6
BYPASS 7
RSSI
2GND 1RF-MODULE1
AWM680RX
1 2 3 4
J4
HDR4P
1 2 3 4
8 7 6 5
SW1
SW DIP-4
1
2
3
J6
HDR3P
1
2
3
J5
HDR3P
RSSI +5F
+C4
470uF/10V
AUDR AUDL VID
R3 3.3K R2
3.3K R1
3.3K
+5F
VCC R5
2.2 R6 2.2
EXP
C11 .1uF
C12 .1uF
6.5VDC MIN