Messages

2971

North American Shortwave Pirate / Re: UNID 6925 AM 1524 UTC 12 Jan 2016

« on: January 12, 2016, 1715 UTC »

Tuned in at 1715, S6 signal with the noise at S5 right now.  Can hear the carrier and hints of old time music.  A tad bit easier to listen to in USB.   

2972

North American Shortwave Pirate / Re: Liquid Radio 6925 AM 2302 UTC 11 Jan 2016

« on: January 12, 2016, 0225 UTC »

Still have a S7 level carrier on 6925 at 0215 UTC but can't hear much of any audio in AM mode.  The LSB seems to have a tone on it, around 500 Hz away from the center carrier on 6925.0 kHz, along with some pescadores (that, or there's another, slightly weaker, carrier on 6924.5 kHz).  Been listening for a few minutes on 6925 USB and haven't heard anything except for some weak beeps which may be Link-11?

2973

North American Shortwave Pirate / Re: UNID 6922.1 USB 2205 UTC 1/10/16

« on: January 10, 2016, 2219 UTC »

Real messy on 6925 right now with the pescadores on 6925 LSB, talking/sirens on 6922.1 USB and whoever is on 6925 AM

"What are you, some kind of doomsday machine, boy?!"

Sounds like audio clips from Live and Let Die

2974

North American Shortwave Pirate / Re: UNID 6925 AM 2145 UTC 10 Jan 2016

« on: January 10, 2016, 2151 UTC »

Regarding the Link-11 signals on 6925 USB, is that the same thing I'm hearing/seeing on the K2SDR waterfall as what looks like CW dots across the 6926-6929 kHz range?  See thread:  http://www.hfunderground.com/board/index.php/topic,25673.0.html

2975

North American Shortwave Pirate / Re: UNID 6914 then 6910 AM 2110 UTC 01/10/2016

« on: January 10, 2016, 2142 UTC »

Carrier on 6933 kHz now...

2976

North American Shortwave Pirate / Re: UNID 6914 then 6910 AM 2110 UTC 01/10/2016

« on: January 10, 2016, 2131 UTC »

Somebody is dropping carriers all over the band.  6910 kHz, 6920 kHz, 6925 kHz, 6930 kHz, 6950 kHz with some VFO swooshing, then back down to 6940 kHz and 6930 kHz.  Saw a strong carrier on 6975 kHz for a moment as well.

2977

Utility / Re: unid 6929.75 CW 2124 UTC 01.10.2016

« on: January 10, 2016, 2129 UTC »

I'm also listening on the K2SDR WebSDR.  6927.8 kHz USB mode.  Seems like two dashers (different tones) going at once.  S6 on the peaks it looks like. 

2978

North American Shortwave Pirate / UNID 6914 then 6910 AM 2110 UTC 01/10/2016

« on: January 10, 2016, 2110 UTC »

Somebody tuning up on 6914 kHz.  Saw a carrier pop up for a few seconds, then a few dashes on the same frequency.  Same thing on 6910 about 60 seconds later.

Somebody is moving around the band.  Saw a carrier on 6915, 6925 and then 6930 (each only for a second or so).

2979

North American Shortwave Pirate / Re: UNID 6925 AM 2037 UTC 10 Jan 2016

« on: January 10, 2016, 2056 UTC »

"Knife calling Variable do you copy, over?".  Talking about antennas and power output as well as filter caps.  Discussiong of TM-218 terminal box and "BC-620" radio. 

Sounds like somebody giving a demo of vintage military radio gear (listening on the K2SDR WebSDR)

2980

10/11 meters / 27255 kHz Pager/Data DX 10 January 2015

« on: January 10, 2016, 2008 UTC »

CB channel 23 - 27.255 - is technically part of both the CB radio service and the R/C radio service.  Per Part 95 of the FCC rules, R/C users are allowed to transmit up to 25w carrier power on 27255....not 25w PEP.  This means, in theory, that a legal pager or R/C transmitter on 27255 could transmit up to 100w PEP power and still be within the FCC power limits, provided the carrier power was 25w or less (carrier power x4 for PEP output).  Ref: FCC Rules 95.210(a) - see https://www.law.cornell.edu/cfr/text/47/95.210. Additionally, modulation methods are not specified, which could explain why the signal I heard seemed to be in FM mode instead of the usual AM.  

During my 11 meter adventures this afternoon I came across a very strong data signal (sounded much better in FM mode) on 27255.  Full scale S9+30 db on my CRE 8900 (Alinco DR-135DX) mobile radio.  I have heard strong data signals on this frequency before but this is the strongest I've heard.  Just another 11 meter frequency to check during band openings

2981

North American Shortwave Pirate / Re: Moonlight Radio 6935 USB 2301 UTC 9 Jan 2016

« on: January 09, 2016, 2349 UTC »

Have them right at the noise level at 2348 UTC on 6935 kHz USB.

2982

The RF Workbench / 11 meter beacon project - 1kHz tone on CB CH 23 - 27.255 MHz 27255 kHz

« on: January 09, 2016, 1905 UTC »

[Scroll to the bottom to see current on-air status]

I'm working on this project with another operator, who wishes to remain anonymous.  So far, two versions have been built.  Mark I, on 27.500 MHz (crystal controlled), transmitting a continuous tone.  Power output is 80mW.  Mark II has a crystal holder provision built in so frequency can easily be changed by changing crystals.  Currently have 26.540 MHz, 26.995 MHz (CB channel 3A, an allocated R/C frequency), 27.090 MHz, 27.185 (CB channel 19) and 27.545 MHz crystals available.  Mark II power output is around 1W, which can be used to drive an amplifier (during testing this produced just under 50 watts).  Transmission is a continuous tone in AM mode.  The Mark II transmitter uses a modified 27MHz R/C controller transmitter.  Antenna is a dipole roughly directional to NE/SW.  

Testing with Mark I on 27.500 with 80mW on the dipole has produced a range of around 1 mile in an urban area during the daytime (band open and noisy).   27.500 is the unofficial "beacon" frequency for the 11-meter freeband.  Mark I is currently not on the air.

Frequency choice is likely to be 26.540/26.995/27.545 due to heavy use of 27.185 (CB channel 19 - the trucker/road channel), 27.090 being right next to CB channel 11 (27.085) which is another very active frequency during band openings.  26.540 is likely to be clear, as is 27.545.  26.995 has an advantage of being within the legal CB band, however there is risk of QRM from Part 15 and Part 95 users (remote control, other low-power data usage, etc).  I feel that 26.995 would attract the least amount of attention from the authorities.  

Transmitter is not under continuous operation at this time, however I am creating this thread to create awareness of this project - which is still on-going.  Version III will likely support a CW ID keyer instead of a continuous tone like Mark I and II.

Testing will begin on 27.545 01/09/2016, alternating between 1w and 50w power levels as I test the antenna system.  Signal is heard in AM mode but can be easily tuned in SSB/CW mode.  

As of 1950 UTC 03/20/2016 the beacon is on 27255 (CB channel 23) at 1w.  Antenna is attic-mounted, facing NE-SW.  Turning on the amplifier causes all sorts of issues - SWR on antenna system jumps from a 1.3:1 to 3:1!  The antenna is cut for 27000 but I'm seeing a SWR of 1.3:1 on the lowest (26540) and highest (27545) frequencies available to me at 1w power levels.  I'm guessing this could be due to the whole setup (transmitter + amplifier + tuner) all being right next to the antenna and RF getting into all or some of those components.  More testing is needed (or I need to get an amplifier that isn't as powerful).


As this is a work in progress, I will eventually be looking at the signal on a spectrograph display and seeing how wide this signal really is.  

EDIT 01/11/2016 2200ish UTC:

Beacon is back on the air, center frequency set at 27545 kHz, signal is roughly 10-15 kHz wide.  Power is 5 watts into a vertically polarized antenna (for this phase of testing 01/11/2016.)  We're still not 100% sure if this is an AM or FM signal, because the tone is more "natural" sounding when tuned in FM mode, on both 27540 kHz and 27545 kHz.   Transmitter is now driving a Thunderbolt 50 amplifier producing 5w into a magnet mount CB antenna that is currently sitting on huge steel piece of HVAC ductwork in the attic.  Should be a sufficient ground plane (SWR reading is the same as the dipole).   For local testing, it makes more sense to use the same polarization the receiving antenna uses (vertical).  Will be switching back to horizontally polarized 1/2 wave dipole shortly..  Local tests using the mag-mount were very disappointing.  Signal lost around 2/3 of a mile away from TX location.  Switched back to dipole (what good is 4w more of power if the antenna sucks?).

EDIT 01/12/2016 1300 UTC:

Mark II is back on the air.  1w into a 1/2 wave dipole.  Tone-modulated signal roughly 10-15 kHz wide centered on 27540 kHz +/- 5 kHz for drift.  

2983

10/11 meters / 11 meter DX Logs 7 January 2015 1900 UTC +

« on: January 07, 2016, 2050 UTC »

11 meters is waking up this afternoon.  Received with a Galaxy DX 959 (modified 26515-27855), Ranger Voyage VR 9000 (modified 25615-28305) and a dipole antenna tuned for the lower part of 26 MHz.  The VR 9000 has wider frequency range and FM but a noisier and less selective receiver compared to the Galaxy, which actually has excellent receive and AM audio quality. The Galaxy has had several modifications to the receive section done to improve SNR. I actually prefer using the channelized "export" equipment that's designed for use on this band compared to a "real" HF amateur radio or SWL setup.  

25625 AM - YL reading numbers in Spanish with roger beep.  S9 signal level at peaks
25635 AM - Music and other QRM (noise toys, etc)
25775 AM - YL taxicab dispatcher, just barely above noise level
25805 AM - Spanish language with echo/reverb
25875 AM - YL taxicab dispatcher with roger beep.  Can hear the taxis she's talking to as well
25970 FM - FM carrier on this frequency.  S3 signal level, no audio heard.  This is an FCC allocated STL freq
26005 AM - Spanish language, weak
26055 AM - YL and OM talking - Spanish language, weak signals, S4 at peaks
26105 AM - Spanish language.  This is a popular trucking frequency (Channel 4 down two bands from the legal CB band)
26375 AM - Roger beeps/noise toys and music heard, no actual voice traffic ()
26465 AM - Spanish language, weak
26525 AM - Spanish language, with music in background and echo/reverb
26535 AM - Spanish language, possibly taxis
26540 LSB - Spanish language, similar to 26555 LSB w/QRM from 26535 AM
26555 LSB - Mexican freeband traffic, heavy QRM (this frequency is used as a "low band" SSB calling channel, see also 27455 USB)
26575 AM - Spanish language, likely from Mexico
26585 AM - Mexican AM "low channel" calling frequency, very busy, S9++ signal levels, music, etc
26595 AM - Spanish language with roger beep, bleedover from strong (overmodulated) signals on 26585 AM
26605 AM - Spanish language, weak but readable
26615 AM - "Hola! Hola! Hola!"
26625 AM - Spanish language, fading up to S9, crazy echo/reverb on OM voice with roger beeps
26665 AM - Music heard at noise floor, fading up to S3
26705 AM - Spanish language, weak
26725 AM - YL dispatcher with roger beep talking to OM (taxi) with different roger beeps
26765 AM - English language, handles "711", "Mr. 26 West Virginia" and "Bicycle" heard
26775 AM - "Unit 20 is 10-7"
26815 AM - English language, Atlanta, GA and other Southern US locations heard
26825 AM - YL Taxicab Dispatcher - Spanish language with roger beep
26885 AM - Station asking for a radio check, other voice traffic at noise level
26905 AM - YL Taxicab Dispatcher reading numbers.  Rapid fading up to S9 and down to S5.  Various roger beeps heard.
26915 AM - US AM CB DX calling frequency, busy, similar to 26815 AM
26955 AM - "Big Radio 549 Texas" working stations, hi-fi broadcast quality audio, S9+30db signal!
26985 AM - CB Ch. 3 - Several stations talking at once, English language heard.  
26995 AM - R/C Channel "3A" - voice traffic heard - Spanish language, with FM data burst QRM
27000 AM - Strong carrier right on 27000.0 kHz
27015 AM - CB Ch. 5 - English "Rush Hour Operator" and Spanish heard, S5 level noisy heterodyne, signals punching through are S9+++
27025 AM - CB Ch. 6 - The Superbowl.  "Georgia Drag queen" "Number 3" "125 in the mobile" "Doctor 45" dozens of other stations
27035 AM - CB Ch. 7 - Similar to 26585 and 27025.  Lots of high-power stations (Spanish language)
27045 AM - R/C Channel "7A" - Spanish language YL heard under bleedover from 27035
27065 AM - CB Ch. 9 - Latin American AM Calling Channel
27075 AM - CB Ch. 10 - "2068 in the Buckeye State"
27085 AM - CB Ch. 11 - Original AM Calling Channel, several stations heard at once.  "Rooster in Texas" "187 in the Carolinas"
27125 AM - CB Ch. 14 - "Hey Joe it's about time we head to the flea market" S9 signal levels, strong audio
27185 AM - CB Ch. 19 - Trucker Channel, several QSOs heard at the same time.  Noise level S4-S5
27195 AM - R/C Channel "19A" - Voice traffic heard down at noise level
27225 AM - CB Ch. 22 - Local stations working DX (or attempting to)
27265 AM - CB Ch. 26 - US AM DX Calling Channel, several stations heard - very strong signals
27285 AM - CB Ch. 28 - Supplementary to 27265.  "Ten-Roger Forrest Gump got a big wave coming your way"
27315 AM - CB Ch. 31 - Spanish language heard at noise level
27335 AM - CB Ch. 33 - Stations talking about locations in North Carolina
27345 AM - CB Ch. 34 - "Southwest Florida" - very strong signal S9+40db
27385 LSB -CB Ch. 38 - North American SSB DX Calling Channel, busy with AM carrier QRM
27405 AM - CB Ch. 40 - Spanish language heard with roger beeps at noise level (S3 on this freq)
27415 AM - Hearing YL reading numbers with roger beep at noise level, likely a taxicab dispatcher
27420 LSB - English language, Southern US accents
27430 USB - Spanish language, Mexican accents, talking about Veracruz and Chihuahua
27435 LSB - "Already have a good one buddy, hope the conditions stay with you, 73s", AM carrier het in the background
27445 LSB - English language, Southern US accents
27450 USB - Spanish language, mention of Guatemala - very strong signal
27455 USB - Latin American SSB DX Calling Frequency, busy with some sort of datamode underneath voice traffic
27465 LSB - English language, Midwestern US accents
27475 USB - Spanish language
27485 USB - Spanish language, with weak AM carrier het in the background, nothing heard in AM mode
27505 USB - Weak traffic heard at noise level with roger beeps
27515 AM - YL Taxicab Dispatcher - Spanish language with roger beep (the station usually heard on this freq during band openings)
27520 LSB - Spanish language, weak
27555 USB - International SSB DX Calling Frequency, hearing Spanish traffic language only
27625 AM - English voice QSO at noise level, presumed truckers due to frequency/mode
27655 AM - Spanish language, Mexican accents with elaborate roger beeps.  QRM from OTH Radar
27665 USB - Spanish language, excellent signal peaking at S9+30db
27685 LSB - Spanish language, OM talking about antennas
27695 USB - Spanish language, weak
27765 AM - Weak AM carrier heard in USB/LSB mode.  Unable to discern language/accent
27815 AM - YL Taxicab Dispatcher - Spanish language
27865 AM - Spanish language, OM talking with echo/reverb effects
27875 AM - Music, noise toys and roger beeps down in the noise
27905 AM - Truckers, English language

2984

North American Shortwave Pirate / UNID 6925.1 AM 1700 UTC 01/06/2016

« on: January 06, 2016, 1710 UTC »

Have a carrier on the WebSDR and hearing it on my local RX setup as well.  Seems to be on 6925.09 kHz or thereabouts.  Liquid Radio perhaps?  going by closeness to 6925.1 kHz. S5 to S7 signal levels.  Solid AM carrier, very weak music heard down in the noise, there is something there.  

Carrier has been on since I checked at 1700 UTC.   Still on as of 1722.

2985

Other / Re: UNID 6924.5 AM 0120 01/06/2016

« on: January 06, 2016, 1515 UTC »

Both were with the K2SDR WebSDR.  Since it seems like that was the only receiver that got these transmissions, it may have been an issue with that particular SDR