Specifications

13
Jumper settings
JH1 Jumper must be ON for units with a DSP board installed. It must be OFF for all other units.
JH3 and JH4 Jumpers adjust the receive gain to the input of the PK-900/PSK according to following
table:
JH3 JH4 Relative Gain
OFF OFF High
ON OFF Medium (Factory Default)
OFF ON Low
ON ON Low
Section 2
PK900/PSK Sound Card Interface Board Settings
Trimpot settings
Trimpot RV1 adjusts the receiver audio signal output level to the sound card input. Use this trimpot to
reduce the signal level to the soundcard if your received signal level is overdriving your sound card
input. (Check the sound card input level indicators on your computer audio control program.)
Trimpot RV2 adjusts the Sound Card audio signal output level to the transmitter audio input. Use this
trimpot to reduce the signal level to the transmit if your sound card output signal level is overdriving
your transmitter input. It is very important not to overdrive your transmitter to avoid interfering
with other stations!