Elecraft PR10 - Manual (Page 2)

Page 2 PR10 10-Meter Receiver Preamplifier Owner’s Manua l
Specifications
Frequency Coverage: 28 – 30 MHz
Noise Figure: < 0.7 dB, 0.5 dB typical
Gain: 18 dB nominal
IMDDR: >100 dB (when used with an Elecraft K3 transceiver)
Power Requirements: 11 to 14 VDC: 13.8 VDC @ 70 mA nominal
Size: Case: 2-1/4” x 2-5/16” x 3/4” (5.72 x 5.87 x 1.91 cm)
Weight 3 oz (90 grams)
Installation and Operation
Elecraft K3
The BNC connector spacing matches the rear-panel RX ANT connectors so the PR10 may be attached to
the K3 using the supplied male-male BNC connectors as shown in Figure 2. A prewired cable is supplied
that connects to the K3 as follows:
 Power is taken from the K3 12V jack on the rear panel: red (12V) to the center pin and black
(GND) to the shell. Power to the PR10 will be switched on and off along with K3 using the front
panel POWER button.
 The Control (CTRL) input is optional (see below) when the DB-15 connector is attached to the
ACC connector on the K3. The white CTRL wire is connected to the DIGOUT1 signal at pin 11 of
the ACC jack on the K3 rear panel through the DB-15 connector (See Figure 2). If you already
have a cable connected to the K3 ACC port for a transverter or band decoder, remove the DB-15
from the cable and add the wire to pin 11 of the existing connector.
Control (CTRL) Input
When the control (CTRL) is used and jumper P2 is removed (see Figure 3), the K3 may be configured so
that the preamplifier is switched on only when the 10 meter band is selected. Since power is switched off
on other bands, the bypass connections are active and the preamplifier does not draw power. Configure the
K3 as follows:
 Select the 10 meter band and then set CONFIG: DIGOUT1 ON. Make sure it is OFF for all other
bands. Note: If a KAT3 ATU is installed, the DIGOUT1 setting will be stored per-antenna (in
addition to per-band). Be sure to turn DIGOUT1 ON only for antennas that require the gain
provided by the PR10. You can tap ANT while you're in the DIGOUT1 menu entry, if applicable.
 On 10 meters, tap RX ANT to enable the preamplifier.
If the control (CTRL) line is not used and jumper P2 is installed (see Figure 3), the PR10 will be switched
into the circuit when the RX ANT button is pressed. The bypass antenna connections are not available
unless power is removed from the PR10.