Hi Grace,
The Com-Power comb generator will do the job for you. Just make sure the
battery is fully charged before you start because when their batteries get
low, the emission characteristics change. I do not recommend using the comb
generator while powered by the AC mains for repeatability purposes.
An EUT can give different results depending on exact cable and accessory
positions, and it will not give you as many frequencies unless it is a very
bad EUT. I've tested a few products in the past that would qualify as
excellent comb generators.
For a complete site comparison, you would want to run a full maximization scan
(turntable and antenna movements) and collect as many data points as possible.
Peak values will be fine, you can measure QP if you want to compare that too.
Hopefully you can do this with software otherwise it will be a time consuming
task. It would not be a bad idea to check a few frequencies manually to verify
the software as well.
Make a mark at the center of your table to make sure it is centered and lined
up with your antenna. Test vertical first, then find a way to orient the comb
generator horizontal. The way I have done it before was set it on its side and
use a small piece of styrofoam to support and hold the antenna straight when
it is in the horizontal polarization. This way you will be sure to have a
straight antenna and minimize vibration when the turntable turns.
This will give you complete data for vertical as well as horizontal. Make sure
you note the exact position of the comb generator so it can be repeated by
others on another site.
Regards,
Tim Pierce
In a message dated 11/20/2009 4:55:04 A.M. Pacific Standard Time,
[email protected] writes:
Dear Members,
I am asked to perform site comparison and would like to hear your
comments.
Should I purchase a signal source? If yes, do you have any reference?
I do
have a COM-POWER comb generator and don't know if it is good enough for the
purpose.
Should I use an EUT for site comparison?
Thank you.
Best regards,
Grace Lin
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