T R O U B L E S H O O T I N G C H A P T E R 1 1
The receiver works great, but I am getting no output power.
Possible Hardware Causes:
1. Sound card cable issues. Try clicking the TUN button on the front panel with the monitor on
(MON) and see if you can hear a tone. It may help to connect speakers or headphones to the end of
the cable that is typically plugged into the To Line Out connector. This allows the drive audio to be
listened to directly. If no tone is heard, then double check the audio wiring using the quick start
guide for your sound card.
2. Microphone Cable setup. If the TUN button test works, but voice transmission does not, double
check that the microphone is setup correctly. If using a microphone connected to the front panel of
the SDR-1000 enclosure, it is necessary to connect the plug on the back labeled To Mic In to the
microphone port on the sound card (see quick start guide).
Possible Software Causes:
Drive setting too low. Check the Drive setting on the left side of the front panel. If using the 100W
PA, this should set the output to something near the value in watts (i.e. a setting of 65 should give a
tone when tuning around 65W). If using the 1W configuration, this will set the output to a
percentage of the audio drive where 100 represents full drive (~1W – depending on the frequency
being transmitted and sound card output).
I am getting some power out, but the power seems low (also, see above—no
power issue).
Possible Hardware Causes:
1. I/Q imbalance on output. If the output cable connecting the sound card to the plug labeled To Line
Out is damaged, one of the channels may not be as strong as the other. This will result in lower
output power, little to no opposite sideband rejection, and distortion. Controls are available to test
this on the Test Tab of the Setup Form.
2. Drop in power supply voltage. In order to reach full output, the radio needs to have a full 13.8V
from the power supply. If the voltage drops even a few tenths of a Volt at the power terminals on
keydown, then the amplifier may not be able to operate at full output. Make sure that there is at least
#12 AWG wiring from the power supply to the terminals.
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179 ď›™FlexRadio Systems
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