I am really having trouble getting a copy of an IQ file upon which I can
demonstrate any kind of AGC problem. I want to fix this but if I cannot
hear, see, etc. it in action, I am unable to perform a diagnosis.
I need "before and after" IQ files.
1) Find an AM station exhibiting the problem.
2) Recording your AGC settings in an email to me along with the names of
the files and a description of what you are seeing. Recording which
version of code your are running. Save your database.xml file for me to
be transmitted as below.
Please use the wave recorder.
3) Make a PRE DETECTION (pre-processing) IQ recording of a station
exhibiting the problem.
4) Repeat this with a POST DETECTION of the same station (ideally) so I
can hear what you are hearing.
5) Zip all of these files, including the database.xml into a single zip
file.
Run a google search for a large free file sharing service.
http://www.google.com/search?rlz=1C1GGLS_enUS359US359&aq=f&sourceid=chrome&ie=UTF-8&q=free+large+file+sharing
Pick one that is acceptable to you and put the file there if you do not
have a personal service we can use. I will download the file, and
complete my analysis on the actual signal files and look for the problem
and fix it.
I do not believe than any AGC problem is unique to AM. I believe that
if it REALLY IS an AGC problem, it will exhibit artifacts on other
modes, including transmit, if it really is AGC. It might be some
inadvertent changes to AM/SAM. I do not believe this. I have had files
sent to me by Tim and they exhibit no problems whatsoever so far as I
can tell. When I listen to local strong AM stations, all seems well
here. I am motivated to find and fix this. But I cannot do it without
your aide.
HNY!
Bob
N4HY
--
(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"the only people for me are the mad ones,
the ones who are mad to live, mad to talk,
mad to be saved, desirous of everything at
the same time, the ones who never yawn or
say a commonplace thing, but burn, burn, burn
like fabulous yellow roman candles" Kerouac
Twitter:rwmcgwier
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