Stage VI Mixer

Posted on Feb 5, 2014

In the `DSP` tab`s `Local Oscillator` section, click on the button marked `Single Band` and type in the desired center frequency (7046000). This sets Rocky`s center frequency at 7. 046 MHz. Set up your transceiver (or other signal source) to transmit a low power signal at 7. 059 KHz into a dummy load and loosely couple it to the board with a short wire If your signal source

Stage VI Mixer
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can sweep the frequency, observe Rocky`s spectrum display as the generator sweeps through the "chunk" of bandwidth centered on the center frequency. Inject an RF signal of about 10 mV RMS at the ANT and RTN pads on the right side on the main board. The signal should be a few kHz either side of the selected center frequency (e. g. , inject a 7. 059 MHz signal for a center frequency of 7. 046 MHz. Look for the output at the R (ring) and T (tip) pads on the left side of the main board. It should be an audio frequency representing the difference between the injected signal and the selected center frequency and it should be approximately 5 V p-p. Once the mixer tests are completed and the extra hardware is installed, you are ready to take the radio for a spin. This final test will use Rocky as the SDR Software. This test assumes you have the following:

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