In this video I’m actually using a remote receiver (Internet based SDR) - specifically the “Flydog SDR” operated by G8JNJ - the receiver itself is located in the UK

Meh. Good question?

Yep

You mean like an actual *pager* 😂

43 MHz VHF CB band - Italy: 24 channels, NFM voice / data. It appears that this service is used like the 5 channel VHF high band license free MURS service + the 6 channel 26-28 MHz license free RCRS service in the U.S. 43.3000 MHz - 43.5875 MHz. Channel 01 - 43.3000 MHz Channel 24 - 43.5875 MHz

Unfortunately you’re probably right. 25/30 years seems to be when a lot of this gear starts to suffer these types of failures.

@@R4002 that's right . Or scour eBay for a good used pro95 and connect a 3.5 mm patch cord to copy the frequencies over .

@@EverydayJ1786yep, not a bad idea. I’ve owned and sold 5 or 6 of this model (Pro-95). Overall, they are excellent scanners, especially for somebody looking for something with more capability than an entry-level type scanner. The Pro-92 is a bit more helpful (for certain applications) because it has CTCSS and DCS decoding capability. Of course, there are many scanners/receivers with this now, including entry-level models.

Probably a pager, on-site restaurant paging system. Are the signals similar to the ones in this video?

@@R4002 It's different. Each transmission is about three seconds long. I spotted it on an SDR. It's miles from my house. Apparently some transmitters are allowed up to 50 watts on that frequency. I've thought about capturing a sample and trying to analyze it but haven't had time.

@@keyboarderror125 watts is the power limit per FCC Rules Part 95, Subpart C. The rules do say “mean transmitter power must not exceed 25 watts” for 27.255 MHz, use of the term “mean power” is odd to me, since you could use an amplitude-shift keying data transmission mode with short duty cycles of power *above* 25w but as long as the mean (average) output is 25 watts or less it follows that rule. I believe elsewhere in the rules for RCRS is states (somewhat contradictorily) that transmitter power must never exceed the limits indicated in this section under any condition of modulation. The rules contradict themselves in other locations as well. They specify that “data” cannot be transmitted via RCRS (Class C) systems, and then turn around and say that “telemetry; telecommand [remote control, wireless control], and sending data from a remote sensor or multiple sensors is *not* data for the purposes of this section” or something to that effect.

@@keyboarderror1 Here is the full text of Part 95, Subpart C: www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-95/subpart-C

§ 95.731 Permissible RCRS use. RCRS transmitters may only be used to transmit one-way communications and only for the purposes set forth in this section. (One-way communications are transmissions which are not intended to establish communications with another station.) (3) RCRS channels in the 26-28 MHz frequency band may be used to control or operate any kind of device. (b) Telecommand. Any RCRS channel may be used by the operator to turn on and/or off a device at a remote location. (c) Telemetry. Any RCRS channel in the 26-28 MHz frequency band may be used to transmit a signal from a sensor at a remote location that turns on and/or off an indicating device for the operator. Then 95.733: 95.733 Prohibited RCRS use. The rules in this section restrict certain uses of RCRS transmitters (b) Data transmission. No person shall use a RCRS transmitter to transmit data. Tones or other types of signal encoding are not considered to be data for the purposes of this paragraph, when used only for the purpose of identifying the specific device among multiple devices that the operator intends to turn on/off or the specific sensor among multiple sensors intended to turn on/off an indicating device for the operator

I would love to…I just need a place to set it up, along with a halfway decent antenna

As far as power requirements go, both the timer relay controller (keyer) and the PS2000AN pager transmitter require 12VDC. I would like to have it connected to a dipole, a regular old quarter wave vertical or half wave base antenna or something along those lines. I also need to measure the RF output, the RadioShack PG-99, which is the same as the PS2000AN internally and appears to have an identical transmitter section (same frequency, same crystal controlled frequency control) actually transmits amplitude shift keying (likely audio frequency shift keying on an AM transmitter, or it’s a FM transmitter but the output changes with the transmitted data due to voltage regulation issues on the example I tested). Either way, power output is limited to 25w. Antenna height is limited to 60 feet (18.3m) above ground OR 20 feet above the highest point of the tower/mast/building/structure the antenna is mounted to, whichever is lower.

@ralphnunn3 - good catch. I would not be surprised if that's what these folks were running. The fact that they were active on at least three frequencies around the same time (151.625 MHz, 151.700 MHz and 154.5275 MHz) indicates to me that it is a large group. That, and those three are officially designated itinerant frequencies under the Business/Industrial Radio Pool (Business Radio Service or "Business Band"). 151.5050 MHz 151.5125 MHz 151.6250 MHz 151.6400 MHz 151.7000 MHz 151.7600 MHz 154.5275 MHz 158.4000 MHz 158.4075 MHz 151.625 MHz is also known as the "Red Dot" channel. 151.625 MHz is the channel with the highest allowed output power of all the VHF itinerant frequencies (300w I believe). The other frequencies are limited to lower power levels. 151.700 MHz and 151.760 MHz are limited to 30w RF output (but ERP may be higher if I remember correctly).

Radio propagation beacon. The 11 meter [wavelength] band (the 26-28 MHz spectrum, all of part of which is used for the 27 MHz CB radio service) usually provides local communications range. However, during the peak of the 11 year sunspot cycle (like *right now*) and during other atmospheric and ionospheric circumstances…instead of local communications range, the 27MHz band provides *extremely* long range communications… ranging from halfway across the country, to halfway across the world to everywhere in between. When the conditions are right, so-called skip propagation takes place, meaning a low power radio signal can travel hundreds or thousands of miles (km). It is often sporadic and random. Having a beacon, in this context - a radio transmitter that sends a unique transmission (signal) on a known frequency all the time…means that folks around the world who hear it know that they can hear signals from that part of the world. The more accurate term would be “radio propagation beacon made using a pager transmitter”. This pager transmitter operates on 27.255 MHz. 27.255 MHz is CB radio channel 23 on the worldwide de facto standard 40 channel CB radio band. 26.965 MHz - 27.405 MHz It’s the same as the American CB radio band plan / channel frequency plan, same as the European standard CB band plan (also called EU band, CE band, CEPT band, “mid band”, FCC band), same as all of Central America, South America, Canada, Mexico, Australia, all of Africa, the Caribbean, basically everywhere. Many countries have additional channels allocated to their country-specific CB radio service, but those are in addition to the standard 40 channel CB radio channel plan. It is also allocated to the RCRS (27.255 is a shared frequency). More details in the second reply to your comment… Using this particular frequency is advantageous because there are a lot of folks using CB radio equipment worldwide

Additional: For example, Germany, the Czech Republic and Hungary have 40 additional CB channels (numbered channels 41-80) for a total of 80. Channels 1-40 are the same as the regular 40 channels. The UK has two sets of 40 CB channels available, the standard 40 channel American CB band plan, often called the “mid band” or the “European band” or “CE CB band” or “Band D” “American CB band” and so on plus 40 additional 27 MHz band channels that are only available in the UK. The UK only channels are known as the “UK FM CB” channels or “UK CB” or “CB 27/81”. So 40+40 channels means 80 total available in the UK. Several other countries have additional CB channels available. Most of South America has 40 or 80 additional channels for a total of 80 or 120. New Zealand has a NZ specific set of 40 channels on 26 MHz: 26.330 MHz - 26.770 MHz plus the standard band plan 26.965 MHz - 27.405 MHz Russia has two sets of 120 CB channels for a total of 240. The point is, 27.255 MHz is used worldwide.

Part 2 of the same intercepted comms: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-laGa1ffPl8U.html