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Re: [IRCA] Saturdays highlights - TP DX in Seattle

In my spectrogram, it's not a bunch of discreet tones but rather a "smeared" single tone as would be seen with a slightly unstable carrier. It looks like the carrier suffers from jitter.


I'd attach a picture of the spectrogram but then my post would get rejected..


Chuck


________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Nick Hall-Patch <nhp@xxxxxxxx>
Sent: Sunday, October 7, 2018 2:18 PM
To: Gary DeBock; Mailing list for the International Radio Club of America
Subject: Re: [IRCA] Saturdays highlights - TP DX in Seattle

There are a mess of tones around 40 Hertz on your audio recording
Gary, plus another around 45Hz.   Interesting that they should
correspond to the offset of N. Korea on that channel.    The Korean
carrier itself may not be very clean....but for the listener, it's
not easy to determine what of a hum is due to offset  from the
Chinese (or ?) on the same channel and what is due to audio that the
station is broadcasting.

I figured however that when your Korean audio was strongest, the hum
was weakest, which would seem to indicate that the hum wasn't part of
the broadcast.

best wishes,

Nick





At 20:22 2018-10-07, Gary DeBock wrote:
>Hmm, interesting, Nick.
>
>It seems like our Japanese friends also made some remarks about the
>buzzing hum of 621-VOK, though-- or maybe it was Chris Kadlec?
>
>Gary
>>On October 7, 2018 at 10:46 AM Nick Hall-Patch
>><<mailto:nhp@xxxxxxxx>nhp@xxxxxxxx> wrote:
>>
>>
>>Thanks Gary,
>>
>>I think the buzz might actually be the 40Hz "hum" from the offset in
>>both our cases, as your "buzz" only shows up as the audio
>>weakens. So, perhaps not part of the distinctive programming, hi.
>>
>>best wishes,
>>
>>Nick
>>
>>
>>
>>At 17:17 2018-10-07, Gary DeBock wrote:
>> >Content-Transfer-Encoding: 7bit
>> >
>> >Nick and Bruce,
>> >
>> ><<< >621 UNID, dreamy vocal song 1356 good but soon faded, possibly DPRK
>>>If you still have the recording Bruce, could you check the frequency
>>>>offset? The wall to wall ballads seemed to be pretty much spot on
>>>>the channel here, though there was also a carrier ~40Hz low, which
>>>>seems to be where DPRK resides. But if I set the BFO to demodulate a
>>>>signal 40Hz low, I got a buzz on the music, not a better signal. >>>
>> >The 621-VoK transmitter (used for NK's Japanese service) has a
>> >notorious buzz on its signal. This was its degraded audio last
>> >December in Kona, Hawaii, most obvious around the 45 second
>> >point
>> <https://dreamcrafts.box.com/s/rhfksf381csgtohluxt3e97tjf79fshm>https://dreamcrafts.box.com/s/rhfksf381csgtohluxt3e97tjf79fshm
>> >
>> >Gary
>> >
>> >
>> >
>>>>On October 7, 2018 at 8:10 AM Nick Hall-Patch
>>>><<mailto:nhp@xxxxxxxx>nhp@xxxxxxxx> wrote:
>>> >
>>> >
>>> >
>>>>At 06:22 2018-10-07, Bruce Portzer wrote:
>>> >
>>> >
>>> >
>>>>Today's report will be very abbreviated, focusing on the really good
>>>> >stuff. I was gone all day and by the time I got home, TA's were
>>>> >starting to come in for the first time this season. So I had
>>>> >limited time for listening to the SDR recording of what was
>>>> >obviously an impressive morning. Anyway, there's probably more to
>>>> >be reported if I can find the time to dig through the files.
>>>> >
>>>> >621 UNID, dreamy vocal song 1356 good but soon faded, possibly DPRK
>>> >
>>>>If you still have the recording Bruce, could you check the frequency
>>>>offset? The wall to wall ballads seemed to be pretty much spot on
>>>>the channel here, though there was also a carrier ~40Hz low, which
>>>>seems to be where DPRK resides. But if I set the BFO to demodulate a
>>>>signal 40Hz low, I got a buzz on the music, not a better signal.
>>>>The ballads were back this morning also (a much more sedate morning,
>>>>whew), but, whoever it is, doesn't seem big on talk.
>>> >
>>> >
>>> >
>>> >
>>>>675 VIETNAM, 1359 woman in Vietnamese, then chime IS and pips at
>>>>ToH (both matching what was heard at 0500 on the Vietnam Kiwisdr
>>>>receiver). After the pips there was rousing march music. The ID, if
>>>>any, was tooweak to copy, but everything else matches perfectly
>>>>I'll have to dig more deeply on that one, as I was hoping for
>>>>Vietnam, but couldn't hear the chimes at first listen.
>>>>best wishes,
>>>>Nick
>>> >
>>>>Nick Hall-Patch
>>>>Victoria, BC
>>>>Canada
>>>>_______________________________________________
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>>>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>http://www.ircaonline.org
>>>>To Post a message: <mailto:irca@xxxxxxxxxxxxxxxx>irca@xxxxxxxxxxxxxxxx
>>
>>Nick Hall-Patch
>>Victoria, BC
>>Canada
>
>Nick Hall-Patch
>Victoria, BC
>Canada
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