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Topics - R4002

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Lots of QRM from Cuban jammer spur, pretty sure its Portuguese.  Wanted to log this since I haven't heard activity on 6911 USB before.

Very busy frequency tonight 6900 kHz LSB

Out of town still, listening on various SDRs.  These guys are currently the only thing popping up on the band on most East Coast/Midwest USA remote SDRs.  QSO started on what I'm calling the "frecuencia de llamando oficial de 43 metros" [official 43 meter calling frequency] and then moved up 5 kHz to 6905 kHz.  

Two several OMs chatting away, very informal, have addressed each other directly several times.  OMs talking over stations, the usual "hola! hola!" and "copiando" (i copy/do you copy?) traffic.  One OM just mentioned "llame me numero cellular" (should be easy to figure that one out - "call my cell phone number") and the channel went quiet at 1346 UTC.  Possible two stations were doing propagation/signal testing.

Activity came back up at 1348 UTC, but sounds like different stations.  "Buenas dias!", "estoy llamando" ("Good morning, I am calling....") etc.  Very informal CB-like chatter, sometimes a station will talk over another one but its nothing like the mess that is often heard on 6925 LSB.  

6900 kHz LSB continues to remind me of 27695 USB/LSB, 27665 USB/LSB and the various frequencies around those two (5 kHz steps), which seem to be the unofficial Latin American "freeband" calling frequencies, and people move up and down from there.  I have a feeling that 6900 kHz is the same thing only for 43 meters.  Wouldn't surprise me if some of these operators are simply moving down in frequency when 11 meters stops providing reliable long-range propagation.  The accents are similar, the use of 5 kHz steps, switching between LSB and USB as a way to escape QRM, congregating around a "calling frequency" or "watering hole" and then going up (or down) in 5 kHz steps from that starting frequency.  

While today's monitoring did not yield any location information (names of cities, obvious accents, etc), monitoring of 6900 LSB kHz / 6900 kHz USB in the past have indicated the following:  Mexican and Central American accents, names of Mexican cities, and propagation when the 6925 LSB guys are nowhere to be found says to me that at least some of these stations are coming out of Mexico.  That's not to say that some of them aren't land-based stations talking to people on boats/fishing fleets.  More exploration into the 690x groups is needed before I can say for sure either way.

EDIT:   at roughly 1350 UTC, at least some of the stations that were on 6900 LSB QSYed up to 6905 LSB and continued their QSO.  I figured I would just edit this post instead of creating a whole new thread.   ;D

I suspect that the peskies down on in the 690x area may be a completely different group (going by propagation/time of day, type of conversation, and, of course, language) than the ones hanging out on 6919 LSB, 6925 LSB, 6933 LSB, etc

I have passable Spanish language skills, somewhat limited vocabulary but ability to pick out accents is helpful. (luckily the Spanish vocabulary used in radio communications isn't too extensive) and have spent a large amount of time listening to 11 meter traffic coming out of Latin America when my "HF" setup consisted of only 11 meters.

Peskies / UNID 6868 kHz LSB 0105-0107+ UTC 22 March 2017
« on: March 22, 2017, 0108 UTC »
More Portuguese-speaking traffic tonight (see also, 6800 kHz USB, 6925 kHz LSB, and a dozen other frequencies). 

This is another easy-to-remember frequency (like 6800, 6900, 6925, 6969, 8000, 8888, etc). 

Two Portuguese-speaking operators talking on 6800 kHz USB with some minor QRM from 6795 USB and 6805 LSB.  Unfortunately heavy static QRN making copy nearly impossible.  

Similar sounding traffic to what was heard earlier this evening on 6925 LSB and similar frequencies, complete with operators laughing at each other and whistling into the microphone

"One two...hello one two...Hola hola?"

Repeated several times over.  Very strong signals - nearly SIO 444 at points.  Operator doesn't seem to be talking to anybody, probably just doing radio testing.

Still repeating the same thing over and over when I turned the VFO

Much stronger signals this evening than most other frequencies heard on the band (including 6935 LSB, 6920 LSB, etc).  Can confirm that the language is in, fact, Spanish.

Following operators noted talking in a net-like fashion (referred to as "el grupo"):

-Carlos, Mexico City
-Rodrigo (??), Jalisco
-Pablo (unknown location)
-"unit 67"
-several others that I'm unable to confirm name/location

Mostly professional-sounding communications, operators saying hello to each other, giving signal reports, with the occasional "HOLA HOLA HOOLLLLAAAA" or transmission on top of on-going traffic.  Mention of "Cubana" "Puerto Rico" and other Caribbean locations.  Requests for signal reports, mention of cell phone numbers, all going on in what almost seems like a directed net.  SIO 333 at best, down to SIO 111 during heavy static crashes and co-channel QRM.  

Peskies / UNID 6935 LSB 0045+ UTC 22 March 2017
« on: March 22, 2017, 0051 UTC »
Hearing very faint two-way traffic on 6935 kHz LSB.  Very weak signals, but sounds like Portuguese to me.  Likely multiple stations talking over each other making copy difficult, combined with nearly nonstop static noise crashes.  SIO 111 from 0045 to 0051 UTC

Hearing what almost sound like telemetry signals on 27255 kHz this morning.  Data bursts roughly 10 kHz wide...varies from every 2 seconds to a 10-12 second wait between bursts.  Nothing else on frequency this morning, and the 11 meter band is relatively quiet.  Just the usual 27185 (Channel 19) and 27355 (Channel 35) AM voice traffic.

I've heard POCSAG mode paging on 27.255 (CB channel 23) before and I know it is used for various on-site telemetry system in addition to R/C purposes (with 26995, 27045, 27095, 27145 and 27195). I have also logged non-stop tone signals on 27255 (although this very well could have been CBers playing around).

FCC rules permit up to 25 watts carrier power on 27.255 MHz for telemetry, paging, etc...that means 100 watts PEP power in AM mode :D


Reference FCC Rules:

47 CFR 95.207 (FCC Rules Part 95 Section 207)
47 CFR 95.210 (FCC Rules Part 95 Section 210)

47 CFR 95.207 95.207 (R/C Rule 7) On what channels may I operate?
(1) The following channels may be used to operate any kind of device (any object or apparatus, except an R/C transmitter), including a model aircraft device (any small imitation of an aircraft) or a model surface craft device (any small imitation of a boat, car or vehicle for carrying people or objects, except aircraft): 26.995, 27.045, 27.095, 27.145, 27.195 and 27.255 MHz.

47 CFR 95.207b 95.207b
(b) You must share the channels with other R/C stations. You must cooperate in the selection and use of the channels. You must share the Channel 27.255 MHz with stations in other radio services. There is no protection from interference on any of these channels.

47 CFR 95.207f 95.207f
(f) Stations in the 26-27 MHz range are not afforded any protection from interference caused by the operation of industrial, scientific of medical devices. Such stations also operate on a shared basis with other stations in the Personal Radio Services.

47 CFR 95.210 95.210 (R/C Rule 10) How much power may I use?

47 CFR 95.210a 95.210a
(a) Your R/C station transmitter power output must not exceed the following value under any conditions:

Channel: 27.255 MHz  Transmitter power (carrier power) (watts) 25
Channel: 26.995-27.195 MHz Transmitter power (carrier power) (watts) 4
Channel: 72-76 MHz Transmitter power (carrier power) (watts) 0.75

Since the FCC regulations under 95.210 specifically state transmitter carrier power instead of peak envelope power, just like how the CB rules specify 4 watts maximum carrier power for 26.965-27.405 MHz, that means that peak envelope power (PEP) for 27.255 can legally be up 100 watts (just like PEP on the CB channels can legally be up to 16 watts).

This also means that you can transmit up to 4 watts carrier / 16 watts PEP on 26.995 MHz, 27.045 MHz, 27.095 MHz, 27.145 MHz and 27.195 MHz for R/C purposes.  Interestingly enough, 27.255 MHz is included in the R/C services for telecommand and telemetry, which one could infer that the other 5 frequencies could be used for this purpose as well (with less maximum transmitter power than allowed on 27.255 MHz).  27.255 is also the only one out of the six available 26-27 MHz channels that is shared with a legal CB channel.

FWIW, this also translates to a maximum power (PEP) of 3 watts (0.75 watts carrier x4) on the 72.01 MHz to 72.99 MHz and 75.41-75.99 MHz bands.

OM talking about the "traffico en la frecuencia" and saying hello to other operators on frequency this morning.  Primary (?) station is loudest, station he's talking to are barely readable.  Sounds like an impromptu net of some sort (similar to 6900 kHz LSB and 6905 kHz LSB).  Discussion of radio propagation conditions, how much traffic is on what frequencies, etc.  Sounds like freebanders to me.  Station ID as "43" and other numerical callsigns all reminds me of freeband CB-like communications.  All three of these frequencies (6895 kHz, 6900 kHz and 6905 kHz) are more or less the same amount of activity.  Stronger signals but heavy QRN this morning making listening difficult. 

Similar to the traffic heard on 6905 kHz LSB this morning.  6900 kHz LSB / 6900 kHz USB seems to be a "calling" frequency of sorts.  Due to heavy static crashes I'm giving this a SIO 211.  Sounds like more than two stations chatting away (the stations on 6905 LSB possibly QSYed from 6900 LSB...this is the behavior I've noticed in the past).

Two OMs talking, SIO 222 to SIO 333 with static crashes this morning.  Long, information conversations.  Sounds like freebanders but difficult to tell what the background noise is (if any) due to heavy static crashes.  

AM signal, around SIO 444.  S5-S6 signal level.  Sounds like an older Dragnet episode....not sure if its one of the radio episodes or TV episodes.

1529 UTC "the narcotics distribution system" "checked the car he owned through DMV"
1530 UTC "the source of the dope"
1534 UTC interviewing the mother of the teenage dope-seller
1544 UTC "a steady supply of obscene literature"
1600 UTC strong carrier het on 6923.8 kHz making listening in AM mode a bit harder.  SIO 433 now
1601 UTC "dead boy report" "body was found in a gutter"
1605 UTC dramatic music
1612 UTC talking about interviewing people at a bar "left the bar at about 1:45am"
1623 UTC "the subject was tried and convicted of manslaughter"
1624 UTC Dragnet theme song "the story you are about to hear is true" "NBC brings you Dragnet"
1625 UTC "a police officer has been shot"
1633 UTC gunfire
1634 UTC "James Vicars, murder suspect, died almost instantly"
1653 UTC audio difficulties, another Dragnet episode starting "for months helpless citizens have been robbed...beaten senseless...kidnapped"
1719 UTC "attention all units suspect is headed east on Wilshire Blvd" siren and tire screeching sound FX
1720 UTC more dramatic music, police radio chatter
1723 UTC Fatima cigarette ad "smoke the best of long cigarettes, smoke Fatima!" then the start of another Dragnet episode
1725 UTC long-distance telephone call to Murphy 761 being placed through several operators (complete with in-band signalling!)
1750 UTC another Dragnet episode starting theme music with Fatima cigarette ad
1817 UTC audio off, carrier dropped off 2-3 seconds later 

Hearing two-way communications in Spanish on 6905 LSB, sounds like two OMs talking.  One of them in quite long-winded.  Also heard a couple radio tests on this frequency.  SIO 222 at best (just above the noise floor at 1500 UTC).  At 1508 UTC, heard two stations talking over each other.  No callsigns/names/handles/identifiers heard so logging this as a pure UNID.

Conversation seems pretty informal.  Hearing one of the ops laughing at what the other op said.  Kind of early for these sort of logs (usually these guys don't show up until the afternoon/evening East Coast of USA time).

Given the proximity to 6900 kHz LSB and the fact that that seems to be the "standard" frequency for Spanish-speaking stations (as opposed to 6925 kHz LSB for Portuguese-speaking stations), I would venture a guess that these operators simply QSYed from 6900 LSB to 6905 LSB. 

YL talking to several OMs.  Sounds like audio from a movie.  S5 signal

About SIO 333 or so

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