Jim,
The advent of SDR has placed tools in the hands of folks that never
could afford the tools you speak of...
Most folks I know can't afford a spectrum analyzer, hence why SDR has
made a very substantial difference in the presentation of RF
environments to folks.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 2/21/20 6:01 AM, AA5CT wrote:
Dave,
When one only really need *one number* (the spacing between
the carriers that one is observing ) we've actually taken a bit of
a step back.
The question to be asked when observing un-ID'd spectra is:
a) Is it continuous spectra or is it discrete 'tones'?
b) What is the width if discrete?
c) What is the spacing if discrete?
A quick 'spin of the dial' used to 'tell' is these factors in the 'daze'
before SDR. In fact, before SDR we still had HP/Agilent/Keysight
spectrum analyzers AND audio spectrum analyzers and
waterfall displays via our PCs.
I still 'spin the dial' on the bandscope-equipped Icoms to come up
with a number for the spacing between observed noise 'tones' too.
73 de AA5CT Jim
.
.
On Friday, February 21, 2020, 7:21:01 AM GMT-6, Dave Cole <dave@nk7z.net> wrote:
How much simpler SDR has made this sort of thing...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 2/21/20 5:10 AM, AA5CT via RFI wrote:
In the "olde days", Jim, we would tune across the band
and note any similar buzzes at xx kHz apart IF indeed we
could find any more 'buzzes'. With powerline arcs,
the spectra is continuous, there are no discrete 'buzzes'
every xx kHz as with a switching power supply working
at say 48 kHz. Anyway, once this short search is done,
a mental picture (in the mind) is assembled, which can
then be passed along to others using words in print.
73 de AA5CT Jim
.
.
On Thursday, February 20, 2020, 10:48:09 PM GMT-6, Jim Brown
<jim@audiosystemsgroup.com> wrote:
On 2/20/2020 6:04 PM, qrv@kd4e.com wrote:
Anyone have a guess as to the source of this noise?
The most useful "picture" of RF noise is a spectrum and waterfall, at
least 200 kHz wide. Wider views can also be quite useful. Study NK7Z's
website.
73, Jim K9YC
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