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Messages - R4002

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6880 kHz 6.880 MHz USB mode Spanish speaking stations

UNNRN has long since disappeared from frequency 6880 kHz.  At least two OMs chatting on 6880 USB with very heavy fading making the content of their conversation difficult to make out...but there's certainly a QSO on the frequency and its certainly in Spanish. 

Spanish-speaking freebanders using a popular pirate radio frequency  :o 6950 kHz USB, although considering their heavy use of 6900 kHz USB and LSB, 6950 kHz makes a bit of sense. 

Typical freebander-like chatter.  Talking about radios, etc.  "este radio es fuerte!"  One of the stations is way down in the noise while the other is a decent SIO 333 or so.  Still quite early for these signals although I've noticed they pop up any hour of of the day or night. 

High energy dance/techno music 6925 kHz USB S3-S4 signal but readable this morning

off around 1508 or 1509

Spanish speaking OMs reading numbers "de Norte" and then repeating them several times.  Possibly an ID or even grid square coordinates....or maybe not..now he's whistling into the mic.  Sounds like more freebanders

Weak Spanish language chatter heard (another interesting frequency!)

Slightly weaker signals than the stations chatting simultaneously on 6900 USB. 

Carrier appeared on 6880 kHz.  No audio heard yet (checking various SDRs) but the carrier is certainly there.

At 1448, some very weak audio there with static crashes.

6900 kHz USB 6.900 MHz USB Spanish Language traffic, mentions of Laredo, Acuna and other cities/towns.  Freebander-like communications, mentions of "Julio" and the fact that somebody isn't at the radio because they're working right now. 

S2-S3 signals with low noise floor this morning.

I used to have a neighbor with an older-generation 10-channel 46/49 MHz cordless phone with the base station (which had a telescopic whip antenna) located on the top floor of their 3-story home.  The cordless phone base station in question got out several miles and the neighbor talked on the phone a lot.  

The 49 MHz band is still used even though most baby monitors have moved up to the various ISM bands 900MHz/2.4GHz/5.8GHz (and various combinations of digital/video/spread spectrum).  The same can be said for cordless phones (plus the 1.9GHz DECT band).  However, cheaper cordless phones still use analog 900 MHz band (902-928 MHz) for base-to-handset link transmissions, often using random frequency steps (there appears to be no standardization in regards to this, with some companies using 12.5 kHz channel steps, others using 40 kHz channel steps, etc).  

RadioShack used to sell 49MHz walkie-talkies (the TRC-512 model among others) before they switched to selling FRS radios.  The 5 channels used by these radios were also the channels used by baby monitors (and cordless phone handsets!).  Made for interesting situations when a neighborhood had baby monitors, cordless phones, and kids with 49MHz FM walkie talkies all on the same frequency.  Further complicating things is the fact that 49.600-50.000 MHz is technically a US military band, and US Army helicopters have been monitored on 49.700 MHz, 49.750 MHz and 49.950 MHz.  

49.830 MHz
49.845 MHz (some companies use/used 49.850 MHz instead)
49.860 MHz
49.875 MHz (some companies use/used 49.870 MHz instead)
49.890 MHz

The RF Workbench / 11 meter / 27 MHz Beacon Project
« on: April 21, 2017, 0421 UTC »
Hello all,

I'm about to move out of my current residence but my soon-to-be-former roommate (and landlord) has agreed to let me keep some radio equipment here.  Included in this list of equipment is an 11 meter dipole antenna installed in the attic of the house [roughly 35-40 feet above ground level].  I was thinking about purchasing one of the RadioShack pager transmitters models 17-6020 and 17-6023 (which are crystal controlled and put out 4-7 watts carrier power), re-crystalling it, dropping the power down, and wiring it for non-stop transmit as a beacon of sorts.  These on-site pager transmitters operate on CB channel 23 - 27.255 MHz.  [parts list: http://support.radioshack.com/support_phones/doc52/52327.htm]

Another option would be to acquire an old R/C transmitter (which, of course, would drastically reduce both my required power to run the transmitter and the actual transmitted power itself).  

I have a bag of 26-27 MHz crystals for the following frequencies:

26.540 MHz
26.670 MHz
26.740 MHz
26.995 MHz [RC Brown/Channel 3A]
27.090 MHz
27.125 MHz [Channel 14]
27.140 MHz [I have 3 of these!]
27.195 MHz [RC Green/Channel 19A]
27.220 MHz [Right between channels 21 and 22]
27.225 MHz [Channel 22]
27.255 MHz [Channel 23] - also the default frequency for RadioShack pager transmitters
27.270 MHz [Right between channels 26 and 27]
27.320 MHz [Right between channels 31 and 32]
27.545 MHz
27.675 MHz
27.725 MHz
27.775 MHz

If you take the in-band [26.965-27.405] frequencies out of the question, that leaves 26.540 MHz, 26.670 MHz, 26.740 MHz, 27.545 MHz, 27.675 MHz, 27.725 MHz and 27.775 MHz.  27.090 MHz is too close to 27.095 MHz (another R/C channel), as is the case with 27.140 MHz (too close to 27.145 MHz, not only heavily used for R/C purposes but also wireless computer mice, etc).  27.225 MHz is a heavily used frequency locally and I fear using it (or 27.220 MHz) would result in somebody DFing me pretty quickly.  

In a perfect world, I'd have somebody build me a dozen or so transmitters that I could place throughout the city I live in various places using various frequencies and various output power levels/antennas.  

eBay has various other frequencies (usually sold in pairs for transmit/receive, the "receive crystal" being tuned to 455 kHz below the indicate frequency - so a crystal set for 26.995 MHz contains a 26.995 MHz crystal and a 26.540 MHz crystal).  

Anybody have any thoughts on this?  The 4-watt RadioShack pager transmitters are available for cheap-ish on eBay and can apparently easily be re-crystalled. Dropping the power down to 1-2 watts or should be easy enough as well.  While a secondhand R/C transmitter would certainly be cheaper, it wouldn't give me nearly as much TX power.


Tuned back in at 0315 UTC on 04/21/2017...and they're still going strong

More logs (after 0300 UTC on April 21st, 2017).

6975 kHz USB - Spanish
6965 kHz LSB - Portuguese
6895 kHz LSB - Spanish
6733 kHz USB - Spanish, Mexican accents
6709 kHz USB - Unknown Asian-sounding language, possibly Japanese
6699 kHz USB - Spanish (with FSK data signal causing heavy QRM)

Lots and lots of logs:

6990 LSB - Spanish
6977 LSB - Spanish
6965 LSB - Portuguese
6950 USB - Spanish
6930 LSB - Portuguese
6925 LSB - Portuguese (very active)
6919 LSB - Portuguese
6915 LSB - Portuguese
6910 LSB - Portuguese
6905 LSB - Spanish
6900 LSB - Spanish (net - very active)
6895 LSB - Spanish (appears to be alternate freq for 6900 LSB)
6868 LSB - Portuguese
6852 USB - Spanish
6805 LSB - Portuguese
6792 LSB - Portuguese (very active)
6771.5 USB - Spanish (with QRM from 6770 kHz AM)
6760 USB - Spanish
6750 USB - Spanish

Heavy storm QRM but heard ID at 0038-0039 UTC

Hearing bits and pieces of OM talking under the storm crashes...strong carrier on 6925.0 kHz...lots of peskies on 6925 LSB though

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