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Author Topic: Dasher Network 2012 UTC 1 Jul 2014  (Read 2253 times)

Offline ChrisSmolinski

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Dasher Network 2012 UTC 1 Jul 2014
« on: July 01, 2014, 2028 UTC »
I first noted the dasher on 6920, then checked around and found the other frequencies:

5970
6060
6150
6240
6330
6420
6720
6820
6920
7020
7130
7240
7460
7570
7920
8040
8160
8280
8400
8500
8530
8670
9050
9190

It is possible some of the frequencies were going on/off or changing while I was looking around.
Chris Smolinski
Westminster, MD
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Offline jFarley

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #1 on: July 01, 2014, 2044 UTC »
Was getting everything booted when I noted 6920 at S4 at 2039z.  Checked HFU and was looking for //s and noted 3 pips on 6820, then off.
Joe Farley, Near Chicago
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Offline ChrisSmolinski

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #2 on: July 01, 2014, 2106 UTC »
Yep, I just went to check again at 2104z, and noticed they all seemed to be QRT.

Perhaps they keep bankers hours.
Chris Smolinski
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Offline Token

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #3 on: July 01, 2014, 2215 UTC »
That is an interesting frequency distribution pattern, and a frequency set that the ditters have not used, at least as far as I have seen, since April 18, 2012.  At that time they were using a 0.0625 msec long pulse every 3.0 seconds.  You did not happen to note the pulse duration or repetition period, did you Chris?

April 18, 2012, was the first transmissions of the ditter network (Pips, in my log) that I have recorded, and the only time they used this specific channelization that I have recorded.

In your report, note that 5970 to 6720 kHz all fall on 90 kHz spacing.
6720 to 7020 kHz is all 100 kHz spacing.
7020 to 7570 kHz is all 110 kHz spacing.  Note the gap in your reported freqs of 7240 and 7460 kHz in this range, that is 240 kHz apart, want to bet there was one at 7350 kHz?  Also note the gap between the end here (7570 kHz) and the next reported freq, 7920 kHz.  Exactly room for two more freqs on 110 kHz spacing, 7680 and 7800 kHz, both were used during the 2012 transmission.
7920 to 8400 kHz is all 120 kHz spacing.
8500 to 8530 kHz is 30 kHz spacing, but if 8500 was not there then 8400 to 8530 would have been 130 kHz spacing.
8530 to 8670 and 9050 to 9190 is 140 kHz spacing.  Interestingly in 2012 they did not use 8670 kHz, but rather they used 8660 kHz, continuing the 130 kHz spacing one more set.

April 18, 2012, they used all the freqs listed above except 8500 kHz.  They also used several more freqs, both above and below this reported range.

In 2012 they also came back on the air later in the evening, and was active until about 0339 UTC.  I guess when I get home from work I will have to keep an eye open for them.

T!
T!
Mojave Desert, California USA

Offline ChrisSmolinski

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #4 on: July 02, 2014, 1404 UTC »
I did not note the pulse duration or period, unfortunately.

I did try checking for some of the "missing" frequencies, but didn't observe anything within a few tens of kHz of them.

So far I haven't seen anything on the overnight SDR recordings, but I'll keep an eye out for them, if they appear overnight.
Chris Smolinski
Westminster, MD
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Offline ChrisSmolinski

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #5 on: July 02, 2014, 1430 UTC »
It seems to be back on again, I am hearing 6720 at 1430z. I need to check for other frequencies. I'm making a short recording of 6720 so I can measure the duration and period. The period does seem to be 3 seconds, from listening.

The highest I am hearing is 8530. The lowest is 5970. I spot checked, but did not check all of the frequencies I was hearing yesterday.

1440z update: I am now weakly hearing 9050, so propagation is likely limiting the highest frequency I can hear.
« Last Edit: July 02, 2014, 1441 UTC by ChrisSmolinski »
Chris Smolinski
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eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

Offline jFarley

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #6 on: July 03, 2014, 0155 UTC »
Was checking for OTR 6770 and noted 6820 at about S7 here at 0135z.  I scanned above and below, but could not find anything else.

A quick look at the audio suggests a pulse width of right about 1/16 Sec with a period of 3 Sec.

Still going at 0245z
« Last Edit: July 03, 2014, 0247 UTC by jFarley »
Joe Farley, Near Chicago
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Offline Token

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Re: Dasher Network 2012 UTC 1 Jul 2014
« Reply #7 on: July 03, 2014, 0331 UTC »
jFarley, yes, they have been up since at least 0110 UTC, 3 July, 2014, and maybe before that.

(edit)  All freqs ended 0340 UTC.

Freqs seen at this time:

19940
19650
19360
19070
18790
18510
18240
17700
17440
17180
16930
16680
16430
16190
15950
15710
15480
15250
15020
14800
14580
14360
14150
13940
13730
13530
13130
12940
12560
12190
12010  (x2)
11830
11660
11490
11150
10990  (x2)
10830
10670
10510
10350
10200
9900
9050
8400
6820

Several other freqs may have it, but are soo weak I can't be sure it is the same thing.  The (x2) freqs show double Pips, two networks on one freq.

T!
« Last Edit: July 03, 2014, 0342 UTC by Token »
T!
Mojave Desert, California USA