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[IRCA] TP DX for 9-23-09
I got to bed late last night and was way too tired to get up and DX this
morning. However, my faithful SDR-IQ listened in my place and heard a
few things. This was my final morning at Hammersley Inlet, near
Shelton, WA.
I noticed a slight enhancement this morning. but it didn't seem to be
nearly as pronounced as what others reported. I think much of it was a
reduction in the domestic splatter, rather than increased strength from
the TP's, although as noted below, some stations did get stronger.
There was actually quite a bit of activity on the upper part of the band
(above 1400 kHz) around 1200 UTC again.
Out of curiosity, I noted the signal strength of JOAK-594 (as reported
by the SDR-IQ display) during 1225-1255 and 1325-1405 UT time periods.
I also noted the approximate noise level (mostly domestic splatter)
between 592 and 598 khz. The actual noise "floor" between 540 and 730
was similar to what I noted below, except near strong domestic
stations. Here are the signal strength measurements I observed during
the two time periods
Time UTC JOAK strength Noise/Interference Level
1225-1235 -60 to -70 dbm -80 to -85 dbm
1235-1245 -62 to -80 dbm -80 to -85 dbm
1245-1255 -58 to -75 dbm -75 to -80 dbm
1325-1335 -60 to -70 dbm -85 to -90 dbm
1335-1345 -55 to -75 dbm -90 dbm
1345-1355 -65 to -80 dbm -90 to -95 dbm
1355-1400 -70 dbm -95 dbm
1400-1405 -80 dbm -95 dbm
Remember, these are negative numbers, so the larger the number, the
weaker the signal. JOAK's strength varied over much the same range for
both time periods until around 1400, when daylight kicked in. The
interference was mostly splatter from domestics on 590, and dropped off
a little earlier than JOAK's signal (no surprise there). The data
represents only two time periods from one station on one day with one
particular receiving setup, but I think it's kind of interesting. Anyone
with too much time on their hands can do the same for other stations,
assuming they have a receiver that can accurately measure both the
noise/interference level and the strength of the desired signal.
Receivers with spectral displays, such as the SDR-IQ, Perseus, etc work
quite well for this sort of thing..
As far as other low-band stations, there were a few that were a bit
enhanced. 612 666 639 603 and 693 all produced peak signal strengths in
the -65 to -75 dbm range some time around 1345, but weren't noted (or
only briefly noted) during the 1225-1255 period, when the noise and
interference levels were higher (around -80 dbm across the lower part of
the band versus -90 to -95 dbm at sunrise), so the improved reception
was indeed a combination of stronger signals and less interference.
As far as actual DX this morning, 594 603 639 657 666 693 747 774 828
1422 1566 1575 were all about normal or a bit above normal. I didn't
record the middle part of the band, so I don't know about 1053 972 1134 etc
Other Highlights:
1593 China dominant 1200 w/pips, signature tune, and ID by man, with
NHK in the background again
1584 Unid carrier, and noisy audio various times 1150-1210
1475 Sometimes producing audio, very erratic strength 1150-1210
1458 & 1467 carriers for the second morning in a row. I can't hear them
in Seattle, thanks to KARR-1460
738 Taiwan in Chinese for a change at 1323, rather than the usual
Korean station
612 Australia fair w/Aussie EE talk 1355, ABC signature tune 1400,
into news
576 Russia good around 1340
Bruce in Seattle
temporarily DXing near Shelton WA
SDR-IQ receiver, with 300' mini BOG
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