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Messages - R4002

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This seems to be a baby monitor used for an old folks' home or to monitor an invalid neighbor or elderly family member.  I did some more listening today with a better antenna.  Previously I was using a 1/4 wave VHF antenna tuned for the 140-160 MHz region, today I used a ProComm JBC1500 60" base-loaded CB antenna tuned for just below CB channel 1, 26.6 MHz or 26.7 MHz or so, as a 1/4 wave.  That makes almost a half wave at 49 MHz....and what a difference that made.  I could hear the 49.830 MHz signal nearly full scale for 1500+ feet in all directions, extending out to 3000 feet or so before the signal completely dropped off. 

I also was able to listen to it on a purpose-built 49 MHz FM walkie talkie - specifically a Maxon PC-50 (same thing as a RadioShack / Realistic TRC-512) 5-channel 49MHz handheld, with 49.83 MHz as Channel A.   I got took two more videos:

49.830 MHz FM range testing part 1 - https://youtu.be/BOfuappHakw

49.830 MHz FM range testing part 2 - https://youtu.be/KYPXazfNeMk

49.83 MHz, pretty wide signal (sounded good on 49.825 MHz and 49.835 MHz in addition to 49.830 MHz).  I was using a VHF high band 1/4 wave antenna, which is certainly not the best antenna.  Noted at least part of the signal on 49.840 MHz too. 


It sounds like somebody has a room monitor just on, you can hear a TV or radio in the background...at 0:59 or 1:00 in you can hear somebody say "oh you ready?".  More chatter around 1:30 and 1:40.  Interestingly enough, my scanner actually decoded too different CTCSS tones - 192.8 Hz and 196.6 Hz, on frequency. 

Virginia House Radio coming in very nicely this morning on 107.7 MHz FM in downtown Richmond.  Music - faded into a relay of the local NOAA Weather Radio All-Hazards station WXK65 (162.475 MHz). 

Receiver is a factory stock Toyota AM/FM car radio with factory FM whip antenna (a real 1/4 wave steel FM whip antenna).

I managed to get two videos of the activity on 107.7 MHz:

Part 1 - https://youtu.be/Y5c3H7YibM8

Part 2 - https://youtu.be/CiOycvrTz7o

Tuned in to hear "I'll Fly Away" into "City On A Hill" at 0945 local time (1345 UTC).  SIO 444 in uptown, SIO 555 sounding really nice downtown Richmond, VA this morning. 

Live (recorded) banjo music at 0751 local time - SIO 555 in downtown Richmond, VA on 107.7 MHz FM.

10/11 meters / Re: UNID 28100 FM 2300 UTC 21 Mar 2020
« on: March 22, 2020, 1446 UTC »
How far off frequency?  Like 28097 kHz or 28099.1 kHz?  I know that 28085 / 28.085 MHz is Channel 19 "up two bands" on export radios - 27.185 MHz - 27.635 MHz - 28.085 MHz + 10 kHz switch gives you 28.095 MHz. 

Export radios that cover 25-30 MHz or so (usually 25.615 MHz - 30.105 MHz, 26.065 MHz - 28.755 MHz or 25.615 MHz - 28.305 MHz) are very popular with fisheries.   

Of course, they could also be running one of the Chinese fishery 27.500 MHz - 39.500 MHz FM fishery radio system, 480 channels 27.5 MHz - 39.475 MHz.  25 watt radios, FM voice 16K0F3E/16K0G3E emissions with 25 kHz steps (27.500 MHz = channel 1, 27.525 MHz = channel 2, etc.)  So 28.100 MHz FM fits within that channel plan perfectly as far as frequency and mode.   I could see one of those radios being 500 Hz off-frequency or so without any issue since they're running regular "20 kHz FM" or "25 kHz FM" - what's used for amateur radio and VHF low band land mobile communications. 


The FT-801 radio and similar radios are not doubt sold by fisheries equipment suppliers in Portugal, Brazil, etc. 

Apparently QRM on the 10 meter band from AM/FM export radios covering 25.615-30.105 MHz and FM fishery radios covering 27.5-39.5 MHz is extremely problematic for ham operators in Asia, since when you look at those channel plans (10 kHz steps 28.005 MHz, 28.015 MHz, 28.025 MHz, 28.035 MHz, etc. AM/FM/SSB and 25 kHz steps 28.000 MHz, 28.025 MHz, 28.050 MHz, 28.075 MHz, 28.100 MHz, 28.125 MHz, 28.150 MHz, 28.175 MHz, up through 29.575 MHz, 29.600 MHz, 29.625 MHz, 29.650 MHz, 29.675 MHz, 29.700 MHz, 29.725 MHz, 29.750 MHz to 39.400 MHz, 39.425 MHz, 39.450 MHz, 39.475 MHz, etc.)



FT-801 Fisheries Dedicated Radio Dual Signaling  fishing boat mobile transceiver

*With distress call, select call, group call, all call, sea and other communications functions call etc.
*National unity networking: able to access the nation's coastal fisheries establishment of several shore station for receiving emergency aid management and undo edits sea conditions forecast.
*Ship's position information be sent automatically and display functions.
*Full band multi-channel 27.5 ~ 39.475 MHz, total 480 channels to work.
*Fishery dedicated communication channel.

Output Power: 25 W
Modulation Limit: 5 kHz
Frequency Range: 27.5 - 39.5 MHz
Channel Spacing: 25 kHz
Number of Channels: 480
Modulation Method: FM (16K0G3E)
Power Supply: DC12V or DC24V
Signal Format: 300 baud rate ASK / 1200 baud rate MSK

Appears to have 10 kHz bandwidth receiver (for FM communications 27.5 - 39.5 MHz) as well as a medium wave and shortwave broadcast receiver covering 500 kHz - 9999 kHz (receive only).  Marine antennas for the 27.5 MHz - 39.5 MHz band are available on the Chinese market. 

Fishing boat special radio FT-801 uses high-quality parts to improve transmitting and receiving performance, intuitive LCD Chinese display screen, and easy operation. According to the needs of fishermen users, this unit adds an AM radio function to facilitate listening to weather broadcasts; Setting 4 Communication channels - 4 channels on duty (channels 221, 231, 236, 238), greatly improving the data signaling connection rate; built-in GPS module to complete positioning and navigation functions.
Fishing boat special radio FT-801 is a new type of wireless telephone with high reliability, multi-function, intuitive display, simple operation and good communication effect. Frequency range: 27.5-39.5MHz Channel grid: 25KHz Number of channels: 480

It would appear that the Chinese have a pretty extensive network set up for this band, much like the Japanese and South Koreans with their 26 MHz / 27 MHz AM and SSB fishery radio systems.  Multi-channel dual watch function for channel 221, channel 231, channel 236 and channel 238, which, if straight channel numbering is used, equal 33.075 MHz, 33.275 MHz, 33.400 MHz and 33.450 MHz.

Therefore, if these guys were using FT-801 radios or similar Chinese spec gear on 28.100 MHz FM, that would equate to channel 25 on these radios. 

Virginia House Radio Richmond Virginia still coming in nicely this afternoon (1400 local time).  Richmond VA - SIO 555 to SIO 444 in Richmond City proper.

More live recorded old time country music, mention of Floyd County, VA. 
  107.7 FM.  Virginia House Radio station in Richmond, VA 107.7 MHz pirate station.

10/11 meters / Re: 11 meter private comms?
« on: March 20, 2020, 1435 UTC »
Running DV on 11m is certainly an option.   The OP 45auto opted for VHF MURS comms instead.

It would be relatively easy to make a mixed mode FM / DMR or FM / P25 digital with encryption system on the MURS frequencies. 

At 0945 local time, hearing some of that good old time music, appears to be live recordings

0950 local - “Sunday Morning Coming Down” Johnny Cash sounding great this morning

They’re back on the air!  0930 local time tune in - DJ talking about self-isolation, followed by several minutes of dead air / unmodulated carrier...now rebroadcasting the local NOAA Weather Radio station WXK65 162.475 MHz (SIO 555 in uptown Richmond at 0936 local

Virginia House Radio 107.7 MHz FM 107.7 FM Richmond VA

They’re back on the air as of me checking at 0930 local time March 19th 2020.  DJ talking about which supplies they have cached at Virginia House Radio.

0932 local - a quick snippet of the local NOAA Weather Radio station, followed by  dead air.  They’re still on the air though!

Checked 107.7 MHz around 1200 local time today March 15th....the usual Virginia House Radio signal was gone.  Not sure if they got busted or they’re QRT for another reason or they’ve moved frequencies.

I will try and check tomorrow and see if they’re back.

Peskies / Re: 6.990MHz LSB / 6990 kHz LSB Indonesian Chanters
« on: March 09, 2020, 1757 UTC »
Massive network of village radio stations - the "chanting nets".  6990 kHz, 6995 kHz, and of course, 7000 kHz.

I'm sure some of them are using higher-end amateur and professional-grade HF-SSB gear.  Wouldn't surprise me if there were some stations using military HF radios too. 

Peskies / Re: 5591 USB, Chat with a few F Bombs, 10:35 UTC
« on: March 09, 2020, 1755 UTC »
Not too far from 60 meters, within the 5 MHz fixed mobile band, and slightly below the 60 meter broadcasting band. 

If not fishermen, I'd guess freebanders using their own version of "60 meters" :D

10/11 meters / Re: Man without a life....
« on: March 05, 2020, 1158 UTC »
They've been around since CB radio was carved from the Amateur Service.

I once saw an old man fight in a supermarket lot over who snagged the most dx back in the call letter days. "Fight" may be an oxymoron for what occurred. They put 'em up, one guy bum rushed the other, ran into the guy's forearm, and hit the pavement. The "winner" got in his truck and drove off.

Our defeated CB warrior got a ride to the hospital in the funeral parlor ambulance. They took you to the hospital and hauled you back to the funeral parlor for a nominal fee if you died. Our brave warrior lived to fight another day.


Pigmeat is right - the original 26.96 MHz - 27.26 MHz allocation was taken from the 11 meter amateur band...and that became the original 23 channel Class D CB service.  27.235 MHz and 27.245 MHz (as well as other frequencies in the 27.4 MHz - 27.9 MHz region) were allocated to business users, 27.255 MHz being shared with paging and telemetry as CB channel 23 (it still is).  When they went to 40 channels in 1977 they added 27.235 MHz as channel 24, 27.245 MHz as channel 25, then 27.265 MHz as channel 26 up to 27.405 MHz as channel 40.

27.430 MHz, 27.450 MHz, 27.470 MHz, 27.490 MHz, 27.510 MHz and 27.530 MHz are still allocated to land mobile radio...and yes, there are a few systems still using those frequencies (nearly all of them using 27.43 MHz, 27.45 MHz, 27.47 MHz or 27.49 MHz - 27.51 MHz/27.53 MHz are allowed CB power levels only). 

Of course, the 25-28 MHz region is peppered with freebanders, hunting clubs, DXers, Latin American taxicab companies, fishing boats, truckers using their “company channel” etc etc

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