Everett,
Thank you. I have it.
Ray, W4BYG
On 8/10/2022 20:11, Everett N4CY via
groups.io wrote:
If you buy a SDRPlay, there is free SA software on SDRPlays
website.
Everett N4CY
On Aug 10, 2022, at 6:59 PM, Paul via
groups.io <w8aef@...> wrote:
?
Take a look
at the RTLSDR dongle.? Cheap
and lots of software available.
?
Paul, W8AEF
?
?
Harvey,
Thanks for your inputs. I have an RspDuo and an
Airspy+ . I've not tried them
for a application such as this. I tend to think
one would not be able to
resolve enough detail accuracy with an SDR, but
I have not tried it.
As for less costly commercial SA's, (all but the
TinySA ($100 or so, with
2.8" screen)), costs near $1,000, as best I can
see.? Also the specs
on what I have seen reveal questionable + and -
amplitude accuracy. Absolute
accuracy is not necessary to reveal any
differences between antenna signal
levels, but repeatability is important.
While I have much retirement time on my hands
and a some dollars to play with
for parts, the commercial alternative is still a
bit more than I want to spend.
I love building and experimenting.
Ray, W4BYG
On 8/10/2022 19:26, Harvey White
wrote:
If you
had a software defined Radio, could you dig
the data out of it?? No idea
about bandwidth or sensitivity, but it might
be sufficiently sensitive
depending on the frequency you're interested
in.? As an alternate thought,
aren't there some very inexpensive SA's out
there?? Would they be
sufficient?
Harvey
?
On 8/10/2022 6:46 PM, Ray, W4BYG
wrote:
Brooke,
Thank you for your comment. I agree using a
SA is probably the best way to measure
EMF's. Been there done that.
But it seems that with some of the new chips
today. a reasonable arbitrary log
characterization could be established (in
dbm or dbV) with a reference dipole
and then switch the feed to the antenna with
supposed gain (or loss) and use a
calibrated attenuator to match the level of
the reference antenna, then read
the delta between them on the attenuator as
gain or loss.
I suspect this has already been done by
those that are much smarter than I.
Just trying to find out if it's so...
Ray, W4BYG
On 8/10/2022 17:24, Brooke Clarke
via groups.io wrote:
Hi Ray:
I looked into Measuring EMFs and the best
result was based on using a spectrum
analyzer that has calibrated amplitudes
based on a 50 Ohm input.
?
?
--
"If you want to build a strong house, I'll give you my engineer's number.
If you want to build a strong life, I'll introduce you to my carpenter."
Lebron and Heather Lackey
Ray, W4BYG