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The use of digital squelch on a channel that has existing tone squelch users precludes the use of the 131.8 and 136.5 Hz tones as the digital bit rate is 134.4 bits per second and the decoders set to those two tones will sense an intermittent signal (referred to in the two-way radio field as "falsing" the decoder). [2]
FMC (to Xilinx board) then USB 2.0 or Gigabit Ethernet. Yes Yes Yes ADALM-PLUTO [15] Pre-built Active 325 MHz – 3.8 GHz (70 MHz – 6 GHz with software modification [16]) 20 MHz (streaming may be less due to USB 2.0) 12 12 Yes 61.44 MSPS 1/1 USB 2.0, Ethernet & WLAN with USB-OTG adapter Yes Yes Yes Xilinx Zynq Z-7010 AFEDRI SDR [17] Pre-built
Even with a high quality SDR, it is worth keeping in mind that the S meter is measuring the strength of the signal at the 50 ohm input of the receiver, not at the antenna. For example, if the radio's input is 50 ohms, but the antenna's impedance is significantly higher, power transfer from the antenna into the radio will suffer, and signal ...
A noise squelch circuit is noise-operated and can be used in AM or FM receivers, ... 162.2 1 67.0 14 107.2 27 167.9 2 71.9 15 110.9 28 173.8 ...
Software-defined radio (SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. [1]
Motorola T5320 FRS handheld radio. The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies around 462 and 467 MHz in the ultra high frequency (UHF) band.
The radio's COS (carrier operated squelch) and PTT lines must be available to the IRLP board. Additionally, courtesy tones, hang time, and node IDs must not be transmitted over the VoIP link. This can easily be accomplished using CTCSS on the repeater transmitter that follows the COS of the receiver.
Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]