TM
FlexRadio Systems 2003 Page 4
5. Multiple Mute or Multiple Select – Notify FlexRadio Systems if you have a
problem with these types of mixers.
6. Bad audio cable or incorrect connection – Read the installation section of the
SDR-1000 Hardware Manual to determine that you have correctly installed all
cables. Check continuity of cables you may have made yourself.
7. Master Mute on sound card mixer stays on – This is probably due to a problem
with the PTT appearing to be engaged. This may cause the SDRConsole to cycle
in and out of transmit very quickly. The software mutes the Master Volume when
transitioning between RX and TX and back again. To see if this is the problem
you can check the Disable PTT box on the SetupOptions>Transmit tab. If this
fixes the problem refer to the topic below, “Radio stays in transmit after releasing
the PTT button.” It is also a possibility that the parallel port cable is not
connected properly.
8. Connectors not properly mated between boards – It is important to make sure that
all connectors between the BPF, TRX and PIO boards are properly mated. For
example if J2 on the BPF board is not mated with J4 on the TRX board, signals
will be very weak.
9. Confirm that that the oscillator at QG1 is fully seated in the pin socket connectors.
You may also see a very high noise floor if the oscillator is not properly seated.
It is possible to confirm proper operation of the mixer setup without the SDR-1000
hardware present. Simply connect an audio signal generator to the line input of the sound
card. Turn on the SDR-Console and set the mode to SPEC (Spectrum). This will display
the entire 40KHz bandwidth of the receiver. If you have properly configured the mixer
as described above you will be able to see and hear a 1KHz signal from the audio
generator. You can move the frequency and you will see it move up and down the
spectrum. It will be displayed as a double sideband suppressed carrier signal.
RFE Just Installed - Now Signals Weak and Transmit Power Low
Operational Description: The RFE requires the fabrication of a 10-pin extension
connector to go between the BPF and RFE board. The connector is fabricated from ½ of
a 20-pin wire wrap socket. The original specification was to cut the pins to ¼ inch
(6.25mm). If the pins are any longer than this, they may short to the PCB below, causing
the BPF relays to malfunction. It is unlikely that this will cause permanent damage but
the radio will not function properly. The installation instructions have now been
modified to specify a length of 3/16 inch to allow more clearance for the pins.
I Am Receiving Signals But Cannot Null the Image
Operational Description: The SDR-1000 and SDR-Console together use Quadrature
Sampling to detect and modulate signals of all types. This means that J1 and J3 require
stereo (I and Q) inputs and outputs respectively from the sound card. The signals must be
of approximately equal magnitude and 90 degrees out of phase in order for the radio to
function properly. If one of the channels is not operating properly or you have
inadvertently connected the radio to the mono microphone input, it will be impossible to
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