Re: [IRCA] Spectrum of 1020 test tone.

["W. Curt Deegan" <WWWR@xxxxxxxxxxxxx>]

Peter, Thanks for the picture.

As it happens, while the particular image I posted didn't show it, 
once the signal picked up later in the evening I often had the same 
harmonics as you did at 2 and 3 kHz on both the 1610 and 1020 kHz 
test signals.  These didn't seem to depend on an overpowering signal 
so much as just one strong enough to bring them up out of the noise.

What I have not been able to find out is why there were two 
additional tones at 980 and 1020 Hz, usually somewhat stronger than 
the 1000 Hz test tone.  You can see this in the image I posted, 
although others I have show it more distinctly.  When the signal was 
coming in best, these could be seen at 1980 and 2020 Hz on the 2000 
Hz tone as well.  Seems if these were all harmonics, they should have 
been at 2X 980 and 1020, rather than still +/-20 Hz off the 2 kHz 
tone.  I'm still trying to find out what these are, possibly 
something about my receiving/audio/computer configuration.  After my 
misunderstanding of the two 1 kHz carriers either side of the 
fundamental test carrier during the 1610 tests, I hesitate to draw 
any conclusions on these tones, hoping instead someone will explain 
what I'm seeing.

When 590 kHz comes on, maybe you can run a trace at higher resolution 
and see if you have those +/-20 Hz traces too.  If not I'll know it's 
something local.

I love playing with spectrum analyzers.  I also have some interesting 
results from the SpecLab program, but it is so complicated I've 
barely begun to figure out the basics.

Curt
-------
W. Curt Deegan
Boca Raton, (southeast) Florida


At 01:47 PM 12/4/2006, you wrote:
>Curt -
>
> >>Anyone else have a trace to show?
>
>Here's one of the 1610 khz. tone:
>
>http://www.21centimeter.com/21centimeter/images/1610-khz_0114-Local_12-01-06_Unid.jpg
>
> 
>
>  Receiver 
>
>  Details:     Drake 
>
>  R8B     AM 
> mode     6.0
>  khz. band 
> width
> 
>
>  Spectran 
>
>  Details:     Freq. 
> Offset
>  = 0 
> hz.     USB
>  mode     Resolution = 
> 5.4
>  hz.     Sampling rate 
> =
>  22050 
>
> 
>
>
>
>
>This signal was absolutely overpowering where I live in northern DE. As
>such, I could detect apparent harmonic tones as well. From the well known
>oldies band: Mister E. Tones and the Harmonics.
>
>Regards,
>
>-Pete Jernakoff-
>K3KMS
>Wilmington, DE
>www.21centimeter.com
>
>
>This communication is for use by the intended recipient and contains
>information that may be Privileged, confidential or copyrighted under
>applicable law. If you are not the intended recipient, you are hereby
>formally notified that any use, copying or distribution of this e-mail,
>in whole or in part, is strictly prohibited. Please notify the sender by
>return e-mail and delete this e-mail from your system. Unless explicitly
>and conspicuously designated as "E-Contract Intended", this e-mail does
>not constitute a contract offer, a contract amendment, or an acceptance
>of a contract offer. This e-mail does not constitute a consent to the
>use of sender's contact information for direct marketing purposes or for
>transfers of data to third parties.
>
>Francais Deutsch Italiano  Espanol  Portugues  Japanese  Chinese  Korean
>
>            http://www.DuPont.com/corp/email_disclaimer.html


_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx