Also, it is obvious to us that some stations with ``very expensive commercial transmitters`` do NOT achieve accuracy in frequencies - because the humans operating them do not make sure of that. Glenn
On Sunday, September 1, 2024 at 10:12:44 PM UTC, Glenn Hauser via groups.io <wghauser=yahoo.com@groups.io> wrote:
These are not useless, as they can be a characteristic of a transmitter to be off-frequency, assisting in identifying it. BUT one must be careful to compare the SDR readout to e.g. WWV for accurate calibration. Even so the final digit may best be considered approximate. After a while, one has a feel for which ones are not likely to be accurate. Glenn Hauser
On Sunday, September 1, 2024 at 08:36:07 PM UTC, Ken Baird <ka.baird@xtra.co.nz> wrote:
> On 01/09/2024 12:33 PM NZST df5sx.p11 via Hard-Core-DX <hard-core-dx@hard-core-dx.com> wrote:
>
>
> USA yes WTWW Lebanon TN on air at 23.44 UT Saturday Aug 31.
> Sermon like TOM BS on other US religious stns.
> 9475even Chapter of Bethlehem, S=9+35dB in Edmonton-AB-CAN remotedly.
>
> 9929.980 kHz same like WTWW ? S=9+35dB at 23.49 UT Aug 31.
> Nothing heard on 5830 nor 12105 kHz.
>
> 12030 DRM at 23.51 UT Aug 31, S=9 signal of CHN CNR1 digital
> via 3F2 Kunming Anning bcast center.
>
> 5939.920 BRA Voz Missionaria fluttery poor S=5 at 23.55 UT.
> much stronger 9664.971 kHz S=9+20dB at 00.00 UT Sept 1.,
> and much lower sideband signal in 25 mb,
> 11749.775 kHz S=9+10dB at 00.09 UT.
>
> 9818.281 BRA R 9 de Julho. S=9+10dB at 00.03 UT Sept 1st.
>
> 6159.930 USA WBCQ mx program 23.59 UT Aug 31.
>
> 11719.951 kHz much odd VTN VoVTN 1st domestic Vietnamese program,
> from Son Tay, 21.45-10.30 UT, S=9 at 00.07 UT.
>
> 11780 kHz BRA nothing on air, empty channel.
>
> 15190.137 kHz much odd fqy of R Inconfidencia, S=9+15dB at 00.17 UT
> on Sunday Sept 1st.
>
> [selected SDR options, span 12.5 kHz RBW 15.3 Hertz]
> (wb df5sx, wwdxc BC-DX TopNews Aug 31 / Sept 1)
I am interested in the now prevalent quoting of received frequencies to 3 decimal places, which is rather useless. The logger is assuming their cheap SDR is more accurate than the output of a very expensive commercial transmitter. Just because it is possible with SDR software does not make it of merit.
Cheers
Ken A Baird,
6 Willis Grove, Wainuiomata,
Lower Hutt, NZ, 5014
Phone: +64 04 564 257, Mob: 027 285 1476
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