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Topics - Dag

Pages: 1 [2] 3 4
16
Shortwave Broadcast / CHU - QUIET! no time pips heard 0300z 11 July 2017
« on: June 11, 2017, 0326 UTC »
I've been listening to CHU on 3330, 7850, and 14670 KHz for the past 30 minutes: There are no time pips and no announcements, but the signal is strong.

I've never heard CHU as a quiet carrier before.

There's no mention of any testing or absence of time pips on the National Research Council Canada (CHU) web site.

Dag

17
22 Meter Band HiFER Beacons / FL beacon 13555.520 KHz CW
« on: May 25, 2017, 2351 UTC »
I have activated a very low power milliwatt beacon on 13555.520 KHz sending  "FL" in slow speed CW (QRSS3) where each dit is 3 seconds long.

The antenna is a dipole in my attic and the sunspot minimum is nearly upon us, so it's not a great time to launch QRP signals, but there's still some good propagation occurring on 22 meters.

I also have a FSKCW beacon "FL" on 13555.465 KHz which will be temporarily deactivated while I test the CW circuit on 13555.520 KHz.

Dag

18
Spy Numbers / N Korea numbers broadcast
« on: July 20, 2016, 2333 UTC »
Return to cold war tactics?

http://www.dailymail.co.uk/news/article-3697192/Mystery-numbers-N-Korea-broadcasts-carry-Cold-War-echoes.html
Dag

19
Other / Three carriers: 6993.015 KHz +/- 10 Hz Dec 13 2014z i
« on: December 13, 2015, 2056 UTC »
I am hearing 3 strong carriers on 6993 KHz:

6993.017 KHz, another up ~10 Hz, and a third down ~10 Hz from the 6993.017 KHz "center" carrier.  It sounds as if is some faint modulation of two of the three carriers, perhaps a fraction of a Hz.

 Very strong in central Florida: S8-9. I've not heard this before.

What could it be?   

20
Utility / DEA HF comms: still active?
« on: November 07, 2015, 1247 UTC »
I used to hear lots of SSB HF communication from the Drug Enforcement Agency in the late 1980s and early 1990s, usually ground-to-air drug interdiction traffic.

FORMAT was one callsign I heard often which I think was a ground-based operation center as it was always a consistent copy and would be frequently in contact with what sounded like aircraft flying in the Caribbean or around central America tracking boats loaded with cocaine (my guess).
 
I've not come across any in a long time and the reports of intercepts seem absent.

Where'd they go?   What frequencies are likely to be active, if any?

Dag

21
Other / Pips 8912 KHz 1736 UTC 03 OCT 2015
« on: October 03, 2015, 1738 UTC »
Pips on 8912 KHz USB about every 10 seconds.

22
Other / Pips 10237.8 KHz, 26 SEP 2015
« on: September 26, 2015, 1102 UTC »
While listening and watching for "common and precious" beacon on 10237 KHz, I heard an occasional pip on 26 Sept 2015 before sunrise east coast USA.

One pip each 10 seconds 10237.86 Khz heard nearly consistently over about 45 minutes.

I did not copy the "Common and precious" CW beacon.

The large "<" tip points to each pip.
Dag


23
HF Beacons / Sawtooth hifer beacon 13554.40 KHz
« on: June 27, 2015, 2321 UTC »
I've constructed a sawtooth hifer beacon on a dial frequency of USB 13554.40 KHz running a few milliwatts into a homebrew multiband ladderline-fed-MFJ-tuner tuned zig-zaggin' attic dipole up about 15 feet/3 meters. The signal should show somewhere between 725 Hz  and  750 Hz on the spectrum display at the aforementioned dial frequency: the drift is due to ambient air temperature changes.   

The circuit is an NE555 in astable mode and an EPSON SG 8002 oscillator and some old junk box parts on a prototype breadboard with a lot of alligator clips.

The calculated time constant of the NE555 with resistor/capacitor that I'm using show a completed cycle each 343.78 seconds or 5 min 43 seconds, but I  suspect the capacitors/resistors I have are not of tight tolerance. Hence the time it takes to complete one cycle may be off a little, but it looks pretty much in agreement on my spectrum display.

The frequency shift of the sawtooth is about 3 Hertz and with the narrow frequency shift and slow oscillation of the sawtooth, it takes a slow waterfall to see it.

It runs 24 hours/day using a 7 volt wall wart.

I would appreciate some reports and screen shots to test the consistency of copy before I rebuild it Manhattan-style on copper clad pc board in an insulated enclosure to minimize drift.

Should I move the frequency? Are there other ISM signals on the same frequency that may interfere? Codar?

I intend to construct a new dipole or vertical for this signal, and possibly get it solar powered with a night-time battery voltage source if it proves relatively copyable.

This beacon looks nearly like a straight line on a spectrum display of 3 seconds/dot and 10 seconds/dot. It clearly shows it's sawtooth character at 30 seconds/dot and 60 seconds/dot.

Thank you.

Dag

24
HF Beacons / SIW beacon in slant CW mode 13554.71 kHz APR 18 2015
« on: April 18, 2015, 2245 UTC »
I am seeing SIW in slant mode CW (dits show ~ 5 Hz upward deflection, dahs show ~ 5 Hz downward deflection) as seen with ARGO software using 10 dots/sec setting on 13554.71 kHz USB dial frequency.

50 Hz above SIW is EH beacon best seen @ 3 dots/sec setting.



Dag

25
HF Beacons / V1RGO/B 13561.50 kHz CW
« on: April 11, 2015, 0235 UTC »
I easily copied "V1RGO/B" on 13561.50 kHz,  CW ~ 8 wpm repeating it's ID until fadeout at 0232 UTC.

26
Shortwave Broadcast / HFD 5006 kHz and 8006 kHz
« on: April 05, 2015, 2355 UTC »
Does anyone know anything about radio station HFD?

It's listed here:   http://www.shortwaveschedule.com/index.php?station=24230

I'm unable to find information about it.

Dag

27
HF Beacons / Pips 8974 kHz, one each 10 seconds
« on: April 03, 2015, 2342 UTC »
I hear pips, one each 10 seconds, on 8974.0 USB.

The screen shot shows them: http://1drv.ms/1D1ViGh

Dag

28
HF Beacons / Short duration square wave 13554.91 kHz followed by "EH"
« on: April 01, 2015, 2341 UTC »
On April 1 2015 at 2330z I was monitoring 13554.91 kHz USB with ARGO QRS
spectrum display. There was no activity.  

At 2334z a square wave appeared for about for about 120 seconds, then stopped.  See the  link below for the waterfall capture. I started the QRS view within a second of the appearance of the signal.

At 2346z "EH" become started, about 10 hz lower exhibiting a slight drift occasionally, and has been steady for over an hour.   Maybe EH was in testing mode for a few minutes? I don't think so as the shape of the square wave on this unidentified signal doesn't match the "EH" square wave when viewed on the waterfall display. 

This is a screen shot of the short-duration square wave copied on 13554.91 kHz + 590 Hz:
http://1drv.ms/1CyFo4P

Dag

29
HF Mystery Signals / 6959 kHz raspy buzz mystery
« on: March 20, 2015, 2355 UTC »
http://1drv.ms/1MVZgl3

This is a short recording of a raspy buzzy ugly signal on 6959 kHz at 2355 z which shifts in frequency occasionally about 1 kHz, and is about 6 kHz wide. It is s9 in central Florida on an attic dipole.  While I was typing this post, the signal suddenly stopped as 2356 z.   I had been listening to it for about 10 minutes.

Mystery signal

Dag

30
HF Beacons / "C" single letter CW beacon 13527 kHz
« on: March 14, 2015, 0953 UTC »
Single letter CW "C" on 13527 kHz copyable on east coast USA predawn 0950z. Listed as Russian navy beacon, Moscow, Russia


Dag

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