Mine just happens to be sub-1dB accurate as tested.... I can't find the
datasheet from the XG3 measurement.... I did it several years ago.
I power mine with a Bioenno battery rather than a wall wart, too. FYI...
______________________
Clay Autery, KY5G
(318) 518-1389
On 03/24/20 14:41, Greg Troxel wrote:
Bill Smith via Elecraft <[email protected]> writes:
Looking at buying the XG3 signal generator to calibrate S meters.
Particularly thought it would be very useful to calibrate the S meter
in the HDSDR SDR software I use now. I read the S meter calibration
instructions in the manual and was happy to see how simple it is. If
I had tried to use my old Tektronix signal generator I would of had to
buy an RF Power meter to measure the amplitude and a Step Attenuator
to adjust for -73db/50uv.
No, but I intend to do this. It's certainly simple on the XG3 side; the
possibly hard part is on your receiver's side.
Beware that the XG3 output is a square wave. I am 99% sure that this
means the stated power of e.g. -73 dBm is the power of the desired
frequency, and the power of the third harmonic is not included in that.
Certainly that is what you'd want for receiver testing as a ham receiver
should be expected to not respond to the third (fifth, etc.) harmonic.
If anyone has measured an XG3's output at various bands and power levels
on real test equipment, seeing that data would be nice. The manual says
+/- 1 dB typical for most ranges, and doesn't give absolute limits.
Still, even about 1 dB is amazingly good for such an inexpensive device.
Unless you want to buy proper lab gear with controllable output for
vastly more money, the XG3 seems like the best thing out there. I've
only used mine a little bit, but I'm very happy with it.
73 de n1dam
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