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Topics - Corvus

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1
Spy Numbers / V13 15388khz 0205utc 30nov
« on: November 30, 2017, 0214 UTC »
With the NK launch I thought this station might be active. Female 5 number groups with heavy QRM from nearby broadcasters.

2
Equipment / PA3GZK active receive loop
« on: November 13, 2017, 0418 UTC »
I recently reproduced a design by PA3GZK that is also described by PI4NOV. Has anyone else built one of these?

The copper for the loop and fittings is fairly expensive and its partially SMD, so be prepared for tiny soldering on small boards. I had to add a SMD low pass filter to the preamp input to suppress FM broadcast images, there aren't any close by AM transmitters so that wasn't a problem but I suspect close by transmitters would be. My finished copy about 5 meters above ground works so well across the LW/MW/HF band it's just shocking, it consistently out performs a 115' long wire and a wideband vertical by a wide margin.

Wasn't really easy and it took a while, but it was oh so worth it.

PA3GZK design:
https://pa0fri.home.xs4all.nl/Ant/Active%20antenna/Active%20receiving%20%20loop%20antenna%20eng.htm

PI4NOV (in Dutch):
http://arjan-broekhuizen.wixsite.com/pi4nov/loop-antenne-voor-ontvangst

Low Pass Filter:
http://homepage.eircom.net/~ei9gq/lpf.html

3
Spy Numbers / V13 15721khz 0400 UTC 6 Aug
« on: August 07, 2017, 0413 UTC »
Weak with high static, couldn't copy the numbers but clearly a 5 number group cadence. Male voice until 0413.

4
Shortwave Broadcast / All India Radio 17510 0845 utc 29 July
« on: July 29, 2017, 0857 UTC »
Interval music then news (?) in Indonesian per schedule. Excellent signal.

5
Utility / 12.6385 Mhz XSG Shanghai 0745 UTC 5 July
« on: July 05, 2017, 0745 UTC »
Continuous XZG in CW followed by series of four 2 second data bursts.

6
Shortwave Broadcast / RNZI 13840 2100 29 May
« on: May 29, 2017, 2201 UTC »
Radio New Zealand "Voice of the Pacific with world and NZ news, music and weather for Pacific islands. Some fading but good copy.

7
Spy Numbers / V13 11430 USB 0617 UTC May 29
« on: May 29, 2017, 0630 UTC »
Female synthesized voice, too far into the noise to copy but cadence sounded like 4 digit groups until 0630.

8
Utility / SFO ATC 8915 USB 0247 UTC 26 May 2017
« on: May 26, 2017, 0248 UTC »
San Francisco ATC with aircraft position reports and flight clearances. Handing out secondary frequency 5574. ATC(?) generating a dual tone during some transmissions.

Edit: Just heard aircraft request "SELCO" check. Tones are call alerts so the crew doesn't have to listen to HF. Learn something new everyday.

9
Utility / Carrier pulse on 13.560
« on: May 15, 2017, 1943 UTC »
Hearing solid S9 tick here in the mid pacific in the ISM spectrum that's not a listed time station that I can find. A carrier pulse on AM with no modulation. Double tick at the minute mark apparent on sidebands that matches WWVH.

Anyone else hear it or know about it?

10
HF Beacons / 7038.7 CW "K"
« on: April 14, 2016, 0705 UTC »
Heard consistently the last few nights. There's an occasional M or V at random interval.
Station isn't assembled yet after a move so this is on an 817 with a miracle antenna in the living room.

First post here, good site.

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