XG3 Question

classic Classic list List threaded Threaded
2 messages Options
Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

XG3 Question

Jim AB3CV
After lugging my HP8640 up the stairs again last night (ugh) to act as a
source for doing some feedline loss measurements I thought again about
getting an XG3 for this purpose. I have an XG2 but its max output is only
-73dBm. I downloaded the manual and looked at it and the schematics and
realized there is no output filtering rather a square wave is emitted.

So if used with a broadband power meter (like the PIC Power Meter) the PPM
would receive not just the fundamental but the whole spectrum emitted by
the XG3.

So if used for loss measurements it would seem that a short bit of cable
might allow the harmonics to contribute meaningfully to the received power
yet a long cable would attenuate the higher harmonics to a greater degree
and give an incorrect impression of the loss at say 7Mhz. Seems like this
device is only useful then with a tuned receiving device.

Do I have this correct?

tnx
jim ab3cv
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

Re: XG3 Question

Jim AB3CV
Just realized that the K3 internal voltmeter might be of use since it is
obviously frequency selective. I could put the XG3 (or better yet, the
already owned XG2) at the far end of the line after calibrating it in the
shack against the K3 then measure the signal on the K3 display and the line
loss would be the difference of the two.

I think I just saved some money!

More to spend on QSLing!

woo hoo!!

jim ab3cv
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Loading...