Re: Help: correct use of a spectrum analyzer (interpreting signal power measurements with various RBWs)
- From: varsakelis@xxxxxxxxx
- Date: Sun, 10 Feb 2008 08:08:55 -0800 (PST)
On 8 Φεβ, 17:08, Max65 <mpor...@xxxxxxxx> wrote:
When you use large BW, the analyzer shows the total power density of
the spectrum coprised in that BW, and doesn't matter the speed of
frequency hopping of the incoming signal because all the pulsed
signals fall inside that BW span.
While when you use narrow BW you see only the heterodyned signal
between the hopping speed of the incoming signal and the analyzer scan
frequency. The slower is the scan speed the higher is the heterodyned
signals you can see, but this doesn't mean you see them all.
If you set the trace max hold function, and you leave the analyzer
acquire for some seconds, you should have a better graphical
representation of the signal spectrum distribution, but it could be
incomplete anyway. To get its real distribution you should change
various scan speeds leaving the max hold active (if your analyzer
allows it).
Have a great day.
Massimo
Thanks very much. The explanation makes sense, although I am still a
bit puzzled both by the large power I see at around 6.13 GHz with
50MHz RBW (+1dBm - I don't know what could be transmitting at that
frequency) and by the speed of the frequency hopping (it must be fast
in order to justify the big (-22dBbm) reduction in peak power that I
observe when reducing to RBW=3MHz).
I appreciate your help.
Dimitris
.
- Follow-Ups:
- References:
- Prev by Date: EIP 575
- Next by Date: FS Older Electronic Books
- Previous by thread: Re: Help: correct use of a spectrum analyzer (interpreting signal power measurements with various RBWs)
- Next by thread: Re: Help: correct use of a spectrum analyzer (interpreting signal power measurements with various RBWs)
- Index(es):
Relevant Pages
|
