I finished building my 222-28 transverter and decided to test the Rx using the XG3 on 222.200 MHz. I am not seeing a very strong signal (had to use the -73 dBm level) so questioning if my transceiver sensitivity is off.
I understand that the output of the XG3 is calibrated up to 200-MHz and above that harmonics are used (up to 1420 MHz). I would assume then when I entered a freq = 222.200 that the XG3 is really running at 111.100 + harmonics. I wonder if one can use the rule of 1/n for predicting the nth harmonic output level? Been too long since I studied Fourier series to remember the coefficients for a square wave. I measured the XG3 output on my HP432A microwave power meter (10-MHz - 18GHz) which can read from -20 to +10 dBm. I see an output of -3 dBm when running either 222.200 or 144.200 MHz. I am assuming I am measuring the total harmonic energy since I have no filters in use. I wonder if Elecraft might have done an output curve for the 0 dBm output for the whole operating freq. range? I am also assuming the XG3 attenuators for -33, -73, and -107 dBm are wideband over the full operating range. I don't have a spectrum analyzer to measure power lower than -20 dBm. 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep [email protected] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
