INDEX LABORATORIES QRP PLUS Instruction Manual
INDEX LABORATORIES
HF Amateur Radio Transceiver
the QRP PLUS
Contents
FEATURES
2
PUTTING THE QRP PLUS ON THE AIR
3
POWER
3
ANTENNA
4
5
PADDLE
5
MICROPHONE...
5
EARPHONES
6
PANEL CONTROLS
6
OFF/VOL
6
MAIN TUNING
6
DISPLAY
6
ATTENUATOR
6
FAST
7
MEM
7
PWR/S METER
7
XCVE
7
REAR PANEL CONTROLS
8
SIDETONE LEVEL
8
cw
POWER
8
RCVE ANT
9
SERVICE
9
REPLACING THE LITHIUM BATTERY
9
CALIBRATION
10
TRANSMITTER OUTPUT STAGE BIAS
10
S METER ZERO
10
SYNTHESIZER REFERENCE FREQUENCY
11
CIRCUIT DESCRIPTION
12
RECEIVE
12
SSB TRANSMIT
13
CW TRANSMIT
13
INDEX LABORATORIES
HF Amateur Radio Transceiver
the QRP PLUS
Contents
FEATURES
2
PUTTING THE QRP PLUS ON THE AIR
3
POWER
3
ANTENNA
4
5
PADDLE
5
MICROPHONE
5
EARPHONES
6
PANEL CONTROLS
6
OFF/VOL
6
MAIN TUNING
6
DISPLAY
6
ATTENUATOR
6
FAST
7
MEM
7
PWR/S METER
7
XCVE
7
REAR PANEL CONTROLS
8
SIDETONE LEVEL .-
8
cw
POWER
8
RCVE ANT
9
SERVICE
9
REPLACING THE LITHIUM BATTERY
9
CALIBRATION
10
TRANSMITTER OUTPUT STAGE BIAS
10
S METER ZERO
10
SYNTHESIZER REFERENCE FREQUENCY
11
CIRCUIT DESCRIPTION
12
RECEIVE
12
.5.513 TRANSMIT
13
CW TRANSMIT
13
vhe
N
eNt4
QRP PLUS
FEATURES
The QRP PLUS is a compact low power transceiver with the
features and performance you expect in a modern full size
transceiver.
■
Strong, wide dynamic range receiver
■
RF Speech Processor
■
All Band operation 160M through 10M
■
General coverage receiver 1.8MHZ to
29.7MHZ
■
20 Memories can be Set to any frequency in
the operating range
■
Provision for efficient Split operation
■
High performance SCAF digital filters
variable from 100HZ to 2400HZ
■
Single Sideband and Full Break in CW
operation
■
Built in Iambic Keyer
■
Very low power consumption on Receive
Figure 1: Front Panel
PUTTING THE NEW QRP PLUS ON THE AIR
POWER
The QRP PLUS requires a source of 12V DC capable of supplying 1.5
ampere or more. The transceiver uses a coaxial power connector. A
matching cable with pigtails is supplied. A well filtered power
supply of 1.5 amp or greater capacity can be used. A gell cell
of 4 amp hour or greater capacity will also work well. The QRP
PLUS can be damaged by voltages greater than 15 Volts and will
shut down if the supply voltage drops below 11 Volts.
Carefully observe the polarity when connecting the power source.
The center post is positive and the outer shield is negative. The
positive lead on the pigtail is identified with a red stripe.
Reverse connection will not damage the QRP PLUS but will blow the
fuse. It is a good idea to carry a spare fuse for portable
operation. The QRP PLUS uses a standard 3AG 4AMP fast blow fuse.
The fuse holder is located on the rear panel next to the power
connector.
Some wall mounted power supplies do not provide sufficient
filtering or regulation and should not be used with the QRP PLUS.
If the supply is not adequately regulated or if the battery is
run down the unit may work in receive but shut down in transmit
when the heavier load pulls the supply voltage below 11 Volts.
The QRP PLUS can be affected by strong nearby magnetic fields.
Place an AC supply at least several inches away from the
transceiver.
2
3
POWER (1:::)
~
RAU`.11lT
ANT
0 0
SIDE
TONE MIC
ER
° 0 0
PADDLE KEY
0
0
NO CONNECTION
GND
GND
MIC
QRP ANT SWR
ANT
PLUS
BRIDGE
TUNER
Figure 2: Rear Panel
Additional power connectors are available from Index Laboratories
and may also be ordered from Mouser Electronics as P/N 172-4201
2.5mm X 5.5mm split pin power cable assembly.
ANTENNA
KEY
A 3.5 mm phone jack is provided for the key. The key sees +5
Volts at a few milliamperes. The QRP PLUS is set up for full
break in operation and transmits when the key is closed. A
sidetone is also activated. If the QRP PLUS is tuned to a
frequency outside the amateur bands it will not transmit when the
key is closed.
PADDLE
A 3.5mm stereo jack is provided for the keyer paddle.
Connections are shown in Fig. 4. The tip connects to the dot
paddle and the sleeve connects to the dash paddle.
Figure 4: Paddle Connections
0
3.5 mm Stereo Connector
Successful QRP operation requires a reasonably efficient and well
matched antenna. The QRP PLUS expects a 50 ohm matched load.
Excellent results can be obtained with a 60 foot or longer random
wire if a suitable antenna tuner is used. The tuner, SWR bridge
and antenna should be connected as shown in Fig. 3. A good
ground or counterpoise is important in the use of random wire
antennas. Many excellent books are available for more refined
antenna designs.
Unlike most solid state transmitters the QRP PLUS is not readily
damaged by mismatch and does not shut itself down under high SWR
mismatched conditions. However, intentional operation under
mismatched conditions should be avoided. It is possible that the
unit can generate spurious signals under certain extreme
mismatched conditions.
The antenna connection is a standard SO-239 connector as shown in
Fig. 2, rear panel.
Figure 3: Antenna Example
ANTENNA 60'
END FED WIRE
"- OR LONGER
COUNTERPOISE
♦
GROUN
D
GND
DASH DOT
MICROPHONE
The New QRP PLUS is designed for use with electret type microphones.
The icom HM-65 and MFJ 285W can be used without modification.
Many other microphones may be used if the connector is rewired
appropriately. See Figure 5 for plug wiring details.
Figure 5: Microphone Connections
5
4
Loading...