Re: Low Band QMX Spectrum analyzer measurments
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Chris, you technically don't meet the -43 dBc requirement for harmonics on your 80 meter reading. However, I would suggest you add some more attenuation in the path to the SA. At?+15 dBm currently, you are getting very close to the maximum CW level of?+20 specified for your SA. Even though you probably aren't damaging the instrument you are possibly over-driving it and causing it to generate excessive harmonic energy internally. If you have another 10-20 dB attenuator available, put it in line with the 20 dB one and see if the fundamental and all the harmonics come down by that much, or if the harmonics drop even more than that, which would indicate it was overloaded at only 20 dB of attenuation. Good luck ... 73 ... Ron On Thu, Feb 29, 2024 at 12:27?PM Chris <chris.rowland@...> wrote: The High band spectrum analyser topic prompted me to post similar measurements I made with a low band QMX using an apparently good spectrum analyser. |
Ronald Taylor