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It is probably the way you are coupling the spectrum analyzer to the
radio. How are you coupling it to the radio when the antenna is on the radio? If you are just using the antenna on the spectrum analyzer you could be seeing anything. You may be overloading the analyzer. It is difficult to see down that far and not overload the analyzer with the wanted signal. Try switching in a 10 db attenuater at the front end of the analyzer. Do the spurs drop 10 db? If they drop more you are overloading the analyzer. You mentioned connecting the radio directly to the analyzer. If the analyzer is an IFR service monitor or another service monitor then all bets are off as to what you are seeing. They are poor spectrum analyzers. 73 Gary K4FMX On 29 Apr 2004 00:34:31 -0700, (Dummy) wrote: I'm having a two-way radio. One wide-band antenna was hooked up on a spectrum analyzer. Video BW and RES BW was adjusted to 3khz and 1kHz respectively at spectrum analyzer. Span was 300KHz. When radio was being keyed up, spurs could be seen at around plus minus 32Khz and 62khz. However, the amplitude were quite low, about -65 to 70dBc. I was wondering what caused the spurs to appear. If radio was connected directly to spectrum analyzer, this problem could not be seen. When radio was transmitting to different load with different VSWR (up to 8:1), no spurs were seen. Spurs could only be observed while using antenna. Could the VSWR of antenna be worse than 8:1? Just could not figure out the source of the spurs. Please help. |
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