Re: "Electric field strength" measurements?
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Take a look at the RTLSDR dongle.? Cheap
and lots of software available.
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Paul, W8AEF
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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
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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
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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.
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