<html><div><br><br>---------- Original Message ----------<br>From: "Stephen H. Smith via aprssig" <aprssig@lists.tapr.org><br>To: TAPR APRS Mailing List <aprssig@lists.tapr.org><br>Subject: Re: [aprssig] FW: New Product | 4 Watt 27 MHz HF Radio Buoy Transmitter<br>Date: Mon, 24 Feb 2020 18:08:14 -0500<br><br>Given the rampant amount of illegal high-power CB operation in this spectrum, I <br>would not want to depend on being able to reliably receive or control an <br>important device with one of these radios. Logitech even once made cordless <br>mice and keyboards that operated on these frequencies!<br><br>The frequencies mentioned below are the "missing" 10KHz steps of the 27 MHz CB <br>band -- the CB channels go three 10KHz steps and then a jump over a "missing" <br>channel, then three more 10 KHz steps and a jump, etc. These radio control <br>channels were present long before "Class D CB" was created in the late '50s, <br>with channels packed in between the RC channels.<br><br>CBers have long since colonized these "private" channels with modified radios. <br>In fact radios covering the 26-30 MHz range in 5 KHz steps, claimed to be <br>"10-Meter Amateur Radios", are available in the CB section of the convenience <br>store at any large truck stop like Pilot, Love's, etc. The FCC has repeatedly <br>busted these chains with significant fines, but after a few months these radios <br>reappear.]<br><br>On 2/24/2020 12:23 PM, Robert Bruninga wrote:<br>> Hummh… a 27.195 MHz APRS channel?<br>> <br>> *From:*Danny Lemos <sales@lemosint.com <mailto:sales@lemosint.com>><br>> *Subject:* New Product | 4 Watt 27 MHz HF Radio Buoy Transmitter<br>> <br>> <br>> 4 Watt 27 MHz HF<br>> Radio Buoy Transmitter<br>> <br>> The RBT0 transmitter modules offer a 10kHz channel spacing multi channel, high <br>> power, long range HF radio link for Remote Control or Radio Buoy applications.<br>> <br>> <br>> Features<br>> <br>> * Complies with FCC Part 95 Subpart C - §95.735 RCRS equipment certification<br>> exception<br>> * Fractional-N PLL Frequency synthesiser with high stability 10ppm crystal<br>> reference<br>> * DC-DC switch-mode power supplies, for optimum power efficiency<br>> * Channel select by solder links, or re-programmable via serial port<br>> * Overcurrent Protection<br>> * Under-voltage lock-out to prevent unpredictable behaviour at battery<br>> end-of-life. <br>> <br>> <br>> Applications<br>> <br>> * Radio Control Radio Service (RCRS) when used with a matching Encoder/Decoder<br>> * Control of model crafts and devices<br>> * Telecommand - to turn on and/or off a device at a remote location.<br>> * Telemetry - to transmit a signal from a sensor at a remote location that<br>> turns on and/or off an indicating device for the operator<br>> * Beacons or Radio Buoy for Fishing Drift Net <br>> <br>> <br>> Technical Summary<br>> <br>> * Frequencies: 26.995, 27.045, 27.095, 27.145, 27.195 and 27.255 MHz. Any<br>> 0.5MHz sub-band within 26-28 MHz<br>> * FM Deviation ±1.2kHz<br>> * Transmit power: +36 dBm (4 Watts) ±1dB Spurious Emissions < -36dBm (no<br>> spurii output in standby)<br>> * Harmonics < -60dBc (2 nd harmonic -40dBm or -75dBc)<br>> * Supply range: 10V-15V DC (12V Nominal)<br>> * Current consumption: 650mA Nominal (transmit) <10µA Standby (TXE Low)<br>> * Data bit rate: 4kbps max.<br>> * TX modulation bandwidth DC – 3kHz<br>> * TX switching time ON: 50ms from Low to High TXE transition OFF: 25ms from<br>> High to Low TXE transition<br>> * Temperature -20˚C to +55˚C (operating), -30˚C to +85˚C (storage)<br>> * Dimension: 176 x 27 x 6mm<br>> <br>> Image removed by sender.<br>> <br>> <br>> _______________________________________________<br>> aprssig mailing list<br>> aprssig@lists.tapr.org<br>> http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org<br>> <br><br><br><br>_______________________________________________<br>aprssig mailing list<br>aprssig@lists.tapr.org<br>http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org</p></html>
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