Elecraft XG3 RF - Manual (Page 17)

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2. Switch the XG3 on and select the
-73 dBm 50 µV
output level.
3. Tune the receiver for maximum indication on the S-meter and note the reading.
4. Consult your owner’s manual and make adjustments as needed to correct the S-meter reading, if
needed.
Receiver Alignment
The XG3 is ideal for use in aligning band-pass filters, I.F. strips, etc. For example, some Elecraft
transceiver kits suggest using a signal generator for initial alignment of the filters in receive mode on each
band. Note: Do not attempt to adjust the band pass filters on the Elecraft K3. These are carefully adjusted at
the factory for optimal flatness across each band.
RF Signal Tracing and Troubleshooting
The XG3 can be used to inject a signal into an RF or I.F. strip for troubleshooting or measurement
purposes. For example, the XG3’s 0-dBm output level can substitute for the crystal oscillator described in
several Elecraft transceiver manuals. The XG3 is far more versatile, as it can be used on any band and can
be programmed for use on either the RF band on at the I.F. (intermediate frequency).
CAUTION: Use a blocking capacitor to isolate the XG3 from any circuits carrying voltage. Avoid
injecting large RF signals into the XG3. See Reverse Power on pg 14.
When using the XG3 for low-level signal injection, you may want to couple it to the circuit through a
resistor or small-value capacitor to lower the injection level, provide isolation or impedance matching.
However, for many applications one of the four output levels provided will suffice.
VFO/LO for Experimentation
The XG3 can be used as a VFO or local oscillator for many receiver and transmitter projects. The XG3
utility program can be used to move the frequency up or down in discrete steps or you can write your own
XG3 control program (see XG3 Remote Control Commands on pg 18).
If you need a sine wave rather than a square wave for injection at a particular stage, you can follow the
XG3’s output with a low-pass filter. See the ARRL Handbook for suggested filter components. Many mixer
designs can use a square wave, however.
The XG3 could be used as a remote-controlled CW transmitter with and appropriate software application.
In this case it should be followed by a driver stage with shaped keying, a power amplifier, and suitable
harmonic filters.
Many other applications are possible. The XG3 could form the basis for a home-made antenna impedance
analyzer, LC meter, etc.