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Topics - Josh

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Shortwave Broadcast / RHC 11760 2215Z 11DEC22
« on: January 11, 2022, 2223 UTC »
RHC 11760 2215Z 11DEC22
Rousing speech from Dan Ortega of Nicaragua into solo by yl.
-81dBm sigs

ai yi yi!

Weather / Good and cheap wx station?
« on: January 10, 2022, 2005 UTC »
Emphasis on cheap. What wx gizmos do you use? Any cheap and reliable sets out there?

It turns out that many LTE carriers reuse the same keystream when two calls are made within a single radio connection. An attacker can then record an encrypted conversation, then immediately call the victim after that conversation. The attacker can now access the encrypted keystream, and as the keystream is identical to the first conversation, the first conversation can now be decoded.

Shortwave Broadcast / WBCQ 5130 AM 2340Z 19 APR 20
« on: April 19, 2020, 2344 UTC »
Dragnet theme, s1 to s3 or so in the clear with some distant tstorm activity

MW Loggings / 1040 AM
« on: April 11, 2020, 2106 UTC »
Oft have been the times, usually at greyline, when hip hop/rap blared out from the glorious Buick speakers as I rolled (and I assure you they see me rolling, they hatin) along, expecting to hear nothing but powerhouse WHO on 1040, not rap. I finally got around to finding out where the wrap music came from and apparently a fm sta has an am component, an am hip hop/wrap music format. In Colorado.



yo dog


we doin it fo the amlets yo

General Radio Discussion / Short But In Depth TDoA Analysis
« on: April 10, 2020, 2012 UTC »
 HF TDoA multilateration (1)
This blog post contains an analysis of TDoA multilateration applied to signal on 13413.4 kHz using a number of KiwiSDRs located in Europe.

For now the assumption used for making the KiwiSDR TDoA maps is that signals propagate with speed of light along the ground. Here we compare the measured delay differences with the ones obtained from this assumption.

All plots shown in this blog post are generated using octave/matlab .mat files available when using the updated KiwiSDR TDoA algorithm.

The cross-correlations for all combinations of used KiwiSDRs, normalized to have their maximum at unity, are shown below.

Utility / FEMA ALE Net and SHARES HF-SSB Frequencies
« on: April 01, 2020, 0018 UTC »
4030, 6995, 9837, 10358, 10928, 12129, 12216, 13935, 14871, 16314, 19969, 22983

SHARES HF-SSB Frequencies
    4458 kHz USB - SHARES Region 4 SHARES Northeast Region Hurricane Net heard here
    4490 kHz USB - MARS frequency
    4618 kHz USB
    4636 kHz USB - Civil Air Patrol CAP Net 1 Regional Primary (shared frequency)
    5063.5 kHz USB
    5167.5 kHz USB - Alaska Emergency Frequency (see: SECURE)
    5429 kHz USB
    5711 kHz USB
    5760 kHz USB
    6765 kHz USB - SHARES North Primary
    6800 kHz USB
    6845 kHz USB - SHARES Northeast SHARES Region 4
    6910 kHz USB - SHARES Central SHARES Region 6
    6912 kHz USB - SHARES Central alternate frequency (primary 6910 USB)
    6915 kHz USB - SHARES Central alternate frequency (primary 6910 USB)
    7391 kHz USB
    7403.5 kHz USB
    7615 kHz USB - Civil Air Patrol / CAP use as well
    7642 kHz USB
    7792 kHz USB
    7791 kHz USB
    7991 kHz USB
    9057 kHz USB
    9064 kHz USB
    9106 kHz USB
    11108 kHz USB
    11217 kHz USB
    13242 kHz USB
    13426.5 kHz USB
    14396.5 kHz USB - Daytime FEMA use, SHARES admin net
    14402 kHz USB - SHARES West/SHARES daytime frequency
    14928.5 kHz USB
    15094 kHz USB
    17458 kHz USB
    17487 kHz USB
    20107 kHz USB
    25354 kHz USB - Civil Air Patrol / CAP use - 25.354 MHz
    26617 kHz USB - Civil Air Patrol / CAP use - 26.617 MHz
    26620 kHz USB - Civil Air Patrol / CAP use - old CAP local "talkaround" frequency 26.620 MHz AM
    26812 kHz USB - often local use only 26.812 MHz
    27546 kHz USB - often local use only - also used by CAP 27.546 MHz
    29894 kHz USB - often local use only - also used by CAP 29.894 MHz

Amateur Radio / On the HAM bands
« on: March 20, 2020, 2251 UTC »
Started on 20m and clean band with a few strong sigs and some south American dx with a lot of strong sigs coming from  the western US. Moved to 17m and there were several dx stas, one from Caracas, then on to 15m. 15m had a lot of band noise for some reason, noise absent from the other bands, and there was dx under that noise, infuriatingly. Next tried 10m and a wp4 sta is calling cq on 28412 at 2250Z.

Equipment / NEMP Rated surge arrestor
« on: February 23, 2020, 0142 UTC »

I feel this is an excellent price for the amount of protection.
Keep in mind they ground the antenna side center conductor with an inductance while a cap isolates the rig side center conductor and a gas discharge pill protects the works.

Shortwave Broadcast / Radio Verdad 4055KHz
« on: February 23, 2020, 0119 UTC »
Radio Verdad 4055KHz making usual appearance in the pirate radio band. Om in espanolio giving phone numbers and other commentary, s7 and into music background 0118Z 22FEB20

Software / Automated sig id
« on: February 06, 2020, 2232 UTC »
Shazam Style Automatic Signal Identification via the Sigidwiki Database

Thank you to Josť Carlos Rueda for submitting news about his work on converting a "Shazam"-like Python program made originally for song identification into a program that can be used to automatically identify radio signals based on their demodulated audio sounds. Shazam is a popular app for smartphones that can pull up the name of any song playing within seconds via the microphone. It works by using audio fingerprinting algorithms and a database of stored song fingerprints.

Using similar algorithm to Shazam, programmer Joseph Balikuddembe created an open source program called "audio_recogition_system" [sic] which was designed for creating your own audio fingerprint databases out of any mp3 files.

Josť then had the clever idea to take the database of signal sounds from sigidwiki.com, and create an identification database of signal sounds for audio_recogition_system. He writes that from his database the program can now identify up to 350 known signals from the sigidwiki database. His page contains the installation instructions and a link to download his premade database. The software can identify via audio that is input from the PC microphone/virtual audio cable or from a file.

Utility / 10430 BFSK
« on: January 11, 2020, 1941 UTC »
10430cf BFSK 75Bd 850 Shift 1938Z 11JAN19
Presumed KG84 or other crypto in use as acf is 0, just bouncing the smeter

Shortwave Broadcast / 15000 AM 1920Z 28DEC19 WWV
« on: December 28, 2019, 1922 UTC »
15000 AM 1920Z 28DEC19 WWV
Time signal by om in English with WWVH yl clearly in background
S3/5 and rig's a fraction of a cycle off


Shortwave Broadcast / 15140 1914Z 28DEC19 Radio Habana CubaArabic
« on: December 28, 2019, 1918 UTC »
15140 1914Z 28DEC19
Radio Habana Cuba   
Programmed Arabic at this time but def not arabic, more like Portuguese or slavic by om.
S6 steady in the clear.

Shortwave Broadcast / 15580 1910Z 28DEC19 Voice of America
« on: December 28, 2019, 1914 UTC »
15580 1910Z 28DEC19
Voice of America 1
Om in English with pop tracks
S0 to fadeouts on clear channel.

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