Yesterday the Mexican taxi cabs were coming...decently.
I took a quick video clip (using one of the excellent W3HFU KiwiSDR online receivers).
1420 UTC on 21 April 2025
1420x 21.04.2025
04/21/2025
I will note that you can hear at least one OM driver replying to the taxi dispatcher lady. Also, her transmitter is right on frequency this time!
26.765 MHz AM Taxi Cab Comms Mexico Good Signals 1420 UTC 21 Apr 2025 [W3HFU SDR]
The W3HFU receiver is quite good. I also noted comms on
25.615 MHz - begin the "standard" "export radio" frequency coverage - 25.615 MHz - 28.305 MHz or 25.615 MHz - 30.105 MHz
25.615 MHz - Begin "super-low channels" ("Band A") 25.615 MHz - 26.055 MHz
25.635 MHz AM - Taxi cab dispatch - Spanish language, YL dispatcher - Mexico
25.655 MHz AM - Taxi cab dispatch, Spanish language, severe fading
25.695 MHz AM - Taxi cab dispatch - Spanish language, YL dispatcher, this one is almost as reliable as 26.765MHz AM
25.735 MHz AM - U.S. land mobile users / CB radio users (out of band)
25.755 MHz AM - Taxi cab dispatch
25.775 MHz LSB - Spanish language, freebanders
25.805 MHz AM - Taxi cab dispatch, Spanish language
25.835 MHz AM - U.S. truck drivers
25.855 MHz AM - Taxi cab dispatch - Spanish language, YL dispatcher - Mexico
25.860 MHz - Begin U.S. remote broadcast pickup, studio transmitter link and IFB allocation 25.87 MHz - 26.47 MHz
25.895 MHz AM - Truck drivers or out of band CBers, southern US
25.950 MHz FM - Carrier, STL/IFB - unmodulated carrier, carrier squelch (no PL tone)
25.965 MHz LSB - Spanish language, freebanders / out banders
25.995 MHz AM - Taxi cab dispatch, YL - Mexico
26.035 MHz AM - Taxi cab dispatch comms, Spanish language, probably Mexico City
26.055 MHz AM - Taxi cab dispatch - Mexico
26.055 MHz - End "super-low channels" ("Band A" 25.615 MHz - 26.055 MHz)
26.060 MHz - Begin Russian CB allocation (26.060 MHz - 27.865 MHz, 5 kHz spacing)
26.065 MHz - Begin "low-low channels" ("Band B" 26.065 MHz - 26.505 MHz)
26.065 MHz AM - U.S. land mobile users - likely truck drivers
26.095 MHz AM - Taxi cab dispatch - Mexico
26.105 MHz AM - Mexican truckers
26.175 MHz AM - Spanish language comms
26.185 MHz AM - U.S. truck drivers or other land mobile type users
26.200 MHz - Begin European paging (standardized) band, 26.2 MHz - 26.95 MHz
26.200 MHz FM - Paging signals - popular European paging frequency
26.225 MHz USB - Mexican freeband CBers - previously logged frequency, alternates: 26.235 MHz USB, 26.240 MHz USB
26.285 MHz AM - U.S. truckers, talking about movement around a freight yard
26.305 MHz AM - Mexican truckers / CBers, busy
26.330 MHz - Begin New Zealand CBL 26 MHz 40 channel CB allocation 26.330 MHz - 26.770 MHz
26.335 MHz AM - Taxi cab dispatch - Spanish language, YL dispatcher
26.350 MHz FM - Paging and data signals - various bandwidths noted
26.375 MHz AM - Spanish language chatter, likely freebanders
26.405 MHz AM - Truck drivers, English and Spanish heard
26.450 MHz FM - Paging signals, MFSK data bursts
26.480 MHz - End U.S. remote broadcast pickup, studio transmitter link and IFB allocation 25.87 MHz - 26.47 MHz
26.495 MHz AM - U.S. truckers or possibly farmers
26.500 MHz USB - Weak comms, possible Caribbean area net (logged during the last sunspot cycle peak)
26.505 MHz - End "low-low channels" ("Band B" 26.065 MHz - 26.505 MHz)
26.515 MHz - Begin "low channels" ("Band C" 26.515 MHz - 26.955 MHz)
26.515 MHz AM - U.S. land mobile users, logging trucks? Previously logged similar user, complete with YL dispatcher
26.555 MHz LSB - Latin American SSB DX calling frequency, see also: 27.455 MHz USB
26.565 MHz - Begin German 80 channel CB band - 26.565 MHz - 27.405 MHz
26.570 MHz LSB - Spanish language SSB traffic, likely QSY'ed from 26.555MHz LSB
26.585 MHz AM - Mexican truckers / out of band CBers, very very busy
26.595 MHz AM - Mexican truckers / out of band CBers
26.600 MHz FM - Narrowband MFSK data bursts
26.605 MHz AM - Spanish language comms
26.615 MHz AM - Taxi cab dispatch - Mexico
26.635 MHz AM - Taxi cab dispatch - Spanish language
26.650 MHz FM - Data bursts
26.655 MHz AM - Spanish language comms, lots of QRM
26.685 MHz AM - U.S. truck drivers, truckers - talking about scales and traffic (known ABF "company channel")
26.695 MHz FM - Paging signals, poor copy
26.695 MHz AM - Spanish language - Puerto Rico, southern Florida
26.705 MHz AM - Spanish language - Puerto Rico - very strong
26.735 MHz AM - U.S. truckers, popular out of band CB channel
26.745 MHz FM - Paging signals, poor copy - likely UK and/or European hospital paging
26.760 MHz - Begin Japanese 1W DSB Fishery Radio Service (1 watt double side band fishery radio service)
26.765 MHz AM - Taxi cab dispatch - CDMX - the usual suspect on this frequency
26.770 MHz - End New Zealand CBL 26 MHz 40 channel CB allocation 26.330 MHz - 26.770 MHz
26.785 MHz AM - Portuguese language ??? difficult copy
26.805 MHz FM - U.S. freeband CBers - "low channel" FM calling frequency
26.845 MHz AM - U.S. hunters? Talking about "club meetings" - probably hunting trucks
26.850 MHz FM - Data bursts / paging (weak)
26.865 MHz AM - U.S. land mobile comms - ranchers, farmers or similar type users
26.885 MHz AM - U.S. land mobile users or truckers, poor copy
26.900 MHz FM - Data bursts, paging signals
26.900 MHz FM - French language, severe QSB
26.915 MHz AM - U.S. freeband CB "low channel" AM calling frequency "915" or "36 low"
26.935 MHz AM - Taxi cab dispatch - YL dispatcher and OM drivers, Mexico
26.950 MHz - Begin fixed service 26.955 MHz 26955 kHz allocation - 26950 kHz - 26960 kHz
26.950 MHz FM - Data bursts, weak
26.950 MHz - End European paging (standardized) band, 26.2 MHz - 26.95 MHz
26.955 MHz AM - U.S. stations "Big Radio Texas" and other strong signals noted
26.955 MHz - End "low channels" ("Band C" 26.515 MHz - 26.955 MHz)
26.957 MHz - Begin ISM band / Part 18 band, 27.12 MHz center frequency +/- 163 kHz
26.960 MHz - Begin U.S. Part 95 Subpart D - CB Radio Service [CBRS] allocation
26.960 MHz - End fixed service 26.955 MHz 26955 kHz allocation - 26950 kHz - 26960 kHz
26.965 MHz - Begin standard 26.965-27.405 MHz CB radio band
26.970 MHz - Begin U.S. Part 15 allocation 26.97 MHz - 27.28 MHz
26.965 MHz - Begin "mid channels" ("Band D" 26.965 MHz - 27.405 MHz)
26.990 MHz - Begin U.S. Part 95 Subpart C - RCRS allocation 26.995 - 27.255 MHz
26.995 MHz - Telemetry / remote control / data links. 4 watt power limit 8 kHz bandwidth limit, RCRS - U.S. Part 95C allocation
27.045 MHz - Telemetry / remote control / data links. 4 watt power limit 8 kHz bandwidth limit, RCRS - U.S. Part 95C allocation
27.045 MHz FM - French language comms [RCRS data/telemetry/RC frequency]
27.065 MHz AM - Lots of Spanish language stations, very busy [CB CH 9]
27.095 MHz - Telemetry / remote control / data links. 4 watt power limit 8 kHz bandwidth limit, RCRS - U.S. Part 95C allocation
27.120 MHz - ISM / Part 18 center frequency 27120 kHz
27.145 MHz - Telemetry / remote control / data links. 4 watt power limit 8 kHz bandwidth limit, RCRS - U.S. Part 95C allocation
27.145 MHz FM - Data bursts, also on/off keying on ~27.144 MHz
27.195 MHz - Telemetry / remote control / data links. 4 watt power limit 8 kHz bandwidth limit, RCRS - U.S. Part 95C allocation
27.195 MHz FM - Data stream, 4.5 kHz bandwidth [RCRS data/telemetry/RC frequency]
27.195 MHz AM - U.S. stations on frequency [RCRS data/telemetry/RC frequency]
27.195 MHz AM - Taxi cab dispatcher, Mexico [RCRS data/telemetry/RC frequency]
27.215 MHz AM - Taxi cab dispatcher, Mexico [CB CH 21]
27.245 MHz AM - Taxi cab dispatcher, Mexico [CB CH 25]
27.255 MHz - Telemetry / remote control / data links. 25 watt power limit, 8 kHz bandwidth limit, RCRS - shared with CB Radio Channel 23
27.255 MHz AM - Taxi cab dispatcher, lots of RCRS data signals mixing in, also FM voice on frequency [CB CH 23]
27.260 MHz - End U.S. Part 95 Subpart C - RCRS allocation 26.995 - 27.255 MHz
27.280 MHz - Begin U.S. Part 15 allocation 26.97 MHz - 27.28 MHz
27.283 MHz - End ISM band / Part 18 band, 27.12 MHz center frequency +/- 163 kHz
27.295 MHz AM - Taxi cab dispatcher, Mexico [CB CH 27]
27.405 MHz - End "mid channels" ("Band D" 26.965 MHz - 27.405 MHz)
27.410 MHz - End U.S. Part 95 Subpart D - CB Radio Service [CBRS] allocation
27.415 MHz - Begin "high channels" ("Band E" 27.415 MHz - 27.855 MHz)
27.415 MHz AM - Taxi cab dispatcher, severe QRM from SSB signals on 27.410 MHz, 27.415 MHz and 27.420 MHz
27.420 MHz - Begin U.S. Part 90 - Land Mobile Radio allocation (27.43 MHz, 27.45 MHz, 20 kHz steps to 27.53 MHz)
27.445 MHz AM - Taxi cab dispatcher, YL - Spanish language, previously logged on this frequency
27.455 MHz USB- Latin American SSB DX calling frequency, see also: 26.555 MHz LSB
27.500 MHz - Begin Chinese / Asian fishery radio service, 12.5 kHz / 25 kHz steps to 39.5 MHz (FM mode), 480 or 960 channels
27.505 MHz AM - Taxi cab dispatcher, severe QRM from SSB signals all around (alternate to 27.515 LSB / 27.510 LSB)
27.515 MHz AM - Taxi cab dispatcher, YL, severe QRM from "The Knight Patrol" on 27.515 MHz LSB
27.515 MHz LSB - Caribbean area calling frequency "Kilo Papa" ("The Knight Patrol")
27.535 MHz AM - U.S. truckers or other land mobile users
27.540 MHz - End U.S. Part 90 - Land Mobile Radio allocation (27.43 MHz, 27.45 MHz, 20 kHz steps to 27.53 MHz)
27.540 MHz - Begin U.S. Government allocation - fixed, mobile, land mobile services to 28.000 MHz
27.575 MHz AM - U.S. truckers or other land mobile users (yes, I know, this and 27.585 MHz are NTIA allocated U.S. Gov't freqs)
27.59625 MHz - Begin UK FM CB "27/81" band, to 27.99625 MHz - channels 27.60125 MHz - 27.99125 MHz, 10 kHz spacing NFM only
27.601 MHz - Begin WPAS/CADS allocation for LW channel plan, LW01: 27.601 MHz NFM or AM, 10 kHz spacing up to LW40 - 27.991 MHz
27.601 MHz FM - UK FM CB Channel 1 frequency 27.60125 MHz FM
27.605 MHz - Begin WPAS/CADS allocation for UW channel plan, UW01: 27.605 MHz NFM or AM, 10 kHz spacing up to UW40 - 27.995 MHz
27.635 MHz USB - ROS data mode (polytone data signals)
27.635 MHz AM - U.S. truckers, this frequency is just as popular as 26.735 MHz AM or 26.285 MHz AM or 25.835 MHz AM
27.680 MHz - Begin Australian "27 Meg" marine 27 MHz service (27.66 MHz - 27.98 MHz)
27.665 MHz USB - Portuguese language
27.695 MHz LSB - Portuguese language, calling / DX frequency (see also: 27.695 MHz USB)
27.700 MHz USB - SSTV - freeband CB SSTV frequency
27.701 MHz FM - UK FM CB Channel 11, frequency 27.70125 MHz FM - severe QRM from SSTV on 27700
27.715 MHz AM - Taxi cab dispatch with OM drivers, Mexico
27.731 MHz FM - UK FM CB Channel 14, frequency 27.73125 MHz FM
27.735 MHz AM - Taxi cab dispatch - Latin America, likely Mexico, causing QRM to UK FM CB
27.755 MHz AM - Taxi cab dispatch - Spanish language, Mexican taxis
27.765 MHz AM - Taxi cab dispatch - YL dispatcher, Mexico
27.781 MHz FM - UK FM CB Channel 19, very busy frequency 27.78125 MHz FM
27.785 MHz AM - Taxi cab dispatch, severe QRM from/to 27.781.25 FM
27.791 MHz FM - UK FM CB Channel 20
27.795 MHz AM - Taxi cab dispatch
27.800 MHz FM - Data bursts, paging
27.805 MHz AM - U.S. freeband CB radio comms, mobiles, UNID users
27.811 MHz FM - UK FM CB Channel 20, frequency 27.81125 MHz FM
27.835 MHz AM - Taxi cab dispatch - Mexico
27.841 MHz FM - UK FM CB Channel 23, U.K. farmers (likely running CTCSS)
27.845 MHz FM - Paging signals
27.850 MHz FM - Paging signals
27.855 MHz AM - Taxi cab dispatch - Mexico
27.855 MHz - End "high channels" ("Band E" 27.415 MHz - 27.855 MHz)
27.855 MHz - End Brazilian 80 channel CB radio allocation (identical to "Band D + Band E")
27.861 MHz FM - UK FM CB Channel 27
27.865 MHz - End Russian CB allocation (26.060 MHz - 27.865 MHz, 5 kHz spacing)
27.865 MHz - Begin "super-high channels" ("Band F" 27.865 MHz - 28.305 MHz)
27.865 MHz AM - Taxi cab dispatch - Mexico
27.891 MHz FM - UK FM CB Channel 30, frequency 27.89125 MHz FM
27.900 MHz FM - Data bursts - weak
27.905 MHz AM - U.S. truck drivers, southeastern U.S.A. - popular frequency
27.915 MHz AM - U.S. truck drivers or other land mobile users, southern accents
27.935 MHz AM - Taxi cab dispatch - Mexico
27.941 MHz FM - UK FM CB Channel 35, frequency 27.94125 MHz FM - FM carrier (no modulation!)
27.971 MHz FM - UK FM CB Channel 38, frequency 27.97125 MHz FM - one of several UK FM CB DX frequencies
27.980 MHz - End Australian "27 Meg" marine 27 MHz service (27.66 MHz - 27.98 MHz)
27.981 MHz FM - UK FM CB Channel 39, frequency 27.98125 MHz FM
27.985 MHz AM - U.S. truck drivers, possibly logging company or agricultural comms
27.988 - End Japanese 1W DSB Fishery Radio Service (1 watt double side band fishery radio service)
27.991 MHz - End Wireless Public Address System (WPAS / CADS) LW channel allocation in Ireland (UK FM channels) LW40 - 27.991 MHz
27.995 MHz - End Wireless Public Address System (WPAS / CADS) allocation in Ireland, UW40 - 27.995 MHz
27.99625 MHz - End UK FM CB "27/81" band, to 27.99625 MHz - channels 27.60125 MHz - 27.99125 MHz, 10 kHz spacing, NFM only
28.000 MHz - End U.S. Government allocation
28.000 MHz - Begin 10 meter Amateur Radio Service / 10m ham band 28 MHz - 29.7 MHz 
