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Topics - Teotwaki

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1
HF Beacons / MOVED: frequency hopping set of repeating pulses
« on: May 08, 2019, 1313 UTC »
This topic has been moved to HF Mystery Signals as it does not appear to be a transmit mode that is useful as a beacon. It does post an interesting puzzle to solve!

https://www.hfunderground.com/board/index.php?topic=53774.0

2
A very interesting catch but it is not a HF Beacon. This topic has been moved to [Shortwave Pirate].  https://www.hfunderground.com/board/index.php/board,3.0.html

https://www.hfunderground.com/board/index.php?topic=53775.0

3
Utility / USCG 5696 KHz USB
« on: February 26, 2019, 2247 UTC »
approx 22:40Z 26 Feb

tail end of a radio conversation between COM-COM and another station who gave location as
 35 42 N and 120 38 W which could be over Paso Robles, California so maybe it is a USCG aircraft asset.


4
Shortwave Broadcast / WTWW 5085
« on: February 07, 2019, 0516 UTC »
05:14z  07 FEB

Big signal, about 20 dB over the noise.  Didn't recognize the song that just played. DJ was just teasing the local hams in ARES then encouraged others to join their local ARES

Playing "Ain't nothing like the real thing"  Marvin Gaye and Tammy Terrel

5
Equipment / CW Keyers for Beacon Transmitters
« on: January 30, 2019, 1935 UTC »
I have been researching what is currently available and will list them in this thread.

If you add any suggestions keep in mind they should be

 - Easily programmed for the Morse characters used to ID the tranmitter (not restricted to a custom read-only-memory that must be mail-ordered)
 - Low power consumption
 - Must start up in the beacon mode upon power up. (Many Iambic Beacon/CW keyers will not do this)
 - Not too expensive. $20 or less?

https://owenduffy.net/module/smbk/index.htm

There are some interesting Arduino style keyer programs on GitHub that could probably be modified to allow beacon mode upon power-up

Example  https://github.com/k3ng/k3ng_cw_keyer

6
Peskies / 9033.255 KHz USB 01:24Z
« on: January 17, 2019, 0120 UTC »
On right now. Sounds like Chinese

7
Shortwave Broadcast / 5085 KHz WTWW
« on: December 04, 2018, 0431 UTC »
Great signal has been rolling in for the last hour. I don't recognize the female singer at the moment 04:35 UTC 4Dec

8
Shortwave Broadcast / Voice of Vietnam 7315 KHz 01:44 UTC 29Nov
« on: November 29, 2018, 0141 UTC »
Booming in here over S9 on my NRD-525

9
Equipment / Inexpensive signal sources for CW transmitters
« on: August 22, 2018, 1725 UTC »
I've been watching the various flavors of Chinese direct digital synthesizers (DDS) on eBay and you can get a lot of capability for low prices.

Rather than order a crystal from some slow and traceable source you can use one of these to easily choose a frequency for the HF bands

Sorting through the Ebay listings is a pain as the sellers are rarely technical enough to understand what they are selling. The product's description can range from fair to terrible to non-existent.

example:

DDS Function Signal Generator Module DDS Sine Square Sawtooth Triangle Wave

https://www.ebay.com/itm/DDS-Function-Signal-Generator-Module-DDS-Sine-Square-Sawtooth-Triangle-Wave/181860086069?_trkparms=aid%3D444000%26algo%3DSOI.DEFAULT%26ao%3D1%26asc%3D53210%26meid%3D91104aba5aa042f2a34bcc78c75eaffe%26pid%3D100752%26rk%3D2%26rkt%3D6%26sd%3D171928942747%26itm%3D181860086069&_trksid=p2047675.c100752.m1982

Features:

Main AVR DDS V2.0 signal generator features:

Dedicated high speed (HS) signal output up to 8MHz;
DDS signal with variable amplitude and offset;
DDS signals: sine, square, saw, rev saw, triangle, ECG and noise.
216 LCD menu;
Intuitive 5 button keypad.
Frequency adjusting steps: 1, 10, 100, 1000, 10000Hz;
Restores last configuration after power up.

You could unplug the circuit board's display to save a bit of power when it is operating unattended..

The DDS is the green circuit board in the lower half of the picture.


YouTube video review  https://www.youtube.com/watch?v=2zojBi2fvwU

The reviewer points out some design flaws but for under $14 it is hard to complain.

10
HF Beacons / Unknown Dasher? 4095.288 KHz
« on: August 02, 2018, 0124 UTC »
4095.288 KHz  Dasher? Slow rate, maybe 2 seconds. Weak but readable

11
Shortwave Broadcast / WTWW 5085 KHz
« on: July 03, 2018, 0359 UTC »
signal booming in at 04:00 Z

Just played the song "I can See Clearly Now" by Johnny Nash and now "Hey There Georgie Girl" by the Seekers

12
Utility / 4011 KHz USB Net - CAP?
« on: April 05, 2018, 0259 UTC »
Been going a little bit since I tuned in and is just about to end a little after 0306Z 05Apr2018

Some data comms were tried. Callsigns such as 9LL, 9EJ, M9T

13
HF Beacons / 4096.375 KHz
« on: March 23, 2018, 1405 UTC »
4096.375 KHz  Unknown? sendng an "S" or an "O"? Very weak

Maybe Haystack is malfunctioning.

14
Utility / USCG
« on: September 29, 2017, 1427 UTC »
Just heard a female performing test counts without ID'ing on 5696 KHz USB    1420Z 29Sept2017

Also watching 8983 KHz

15
Shortwave Broadcast / 7315 KHz Voice Of Vietnam
« on: September 01, 2017, 0122 UTC »


01:00 Sept 1, 2017

female announcer reading in English but I swear she has a Chinese accent. I know a thing or two about whar Vietnamese accented English sounds like.   ;D   This broadcast appears to be from the Clear Creek transmitter in the US. News and economic reports.

Another female speaker just came on and she is definitely a Vietnamese speaker.

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