Posted by
Edward R Cole on
Jan 03, 2012; 8:23am
URL: http://elecraft.85.s1.nabble.com/XG3-output-above-200-MHz-tp7146019.html
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
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