Wednesday, June 20, 2018

Elecraft KX2 spectrum measurements

I brought my KX2 in to work today and had a look at it on all bands.

I had measured it before on 80 meters but made the mistake of short-pressing the XMIT/TUNE button. A long press is required to cause the KX2 to transmit a carrier.

Rather than testing the rig with a 100mW output, I used 5 watts with attenuation on the input of the HP 8563A. Theoretically, any output should provide the same results (and probably do) but I wanted to test the rig at an output level more likely to be used for actual communications.


All results are well within FCC requirements which state that for transmitters (of 5 to 500 watts output) operating below 30 MHz, spurious emissions must be attenuated by 40 dB (below 5 watts, only 30 dB attenuation is required).
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10 meters; second harmonic 67 dB down from carrier
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12 meters; second harmonic 58 dB down from carrier
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15 meters; second harmonic not discernable
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17 meters; second harmonic not discernable
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20 meters; second harmonic 56 dB down from carrier
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30 meters; second harmonic 56 dB down from carrier
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30 meters; third harmonic 48 dB down from carrier
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40 meters; second harmonic 56 dB down from carrier
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80 meters; second harmonic 53 dB down from carrier
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