Retevis 900MHz License Free Two Way Radio, license-free 900 MHz ISM (Industrial, Scientific and Medical) band.
www.retevis.com
I found this interesting radio while surfing Retevis' site. Not sure what to make of it yet.
This radio is not real. It is VAPORWARE. Retevis put some specs on their website but they are not for this radio at all. There are a number of red flags all over the place. It resembles a hilarious copy and paste job from multiple sources. Can you spot them all? (LOL) I copied and pasted the specs below.
Overview on Retevis' website:
Licensed by the Federal Communications Commission (FCC) and Industry Canada to operate in the license-free 900 MHz ISM (Industrial, Scientific and Medical) band.
Designed for business operations, the DTR Series radio will free your time from regulatory paperwork and licensing applications and saving radio licensing fees.
Features:
1. 900MHz FHSS license free radio
2. Digital and analog compatible
Support DMR digital and analog two communication modes to ensure that the original analog products smooth transition to digital products to meet different communication needs
3. Digital signaling function
Rich calling modes that support DMR protocol, including single call, group call and all call; supports remote inhibit function and other applications
4. Interference free, private communications
Leverage Frequency Hopping Spread Spectrum (FHSS) technology for more reliable and private communication when compared to standard analog radios.
5. High sound quality
This digital two-way radio uses advanced AMBE +2TM voice processing technology to achieve higher quality
6. Prominent functional keys
Programmable button can be used to quickly access call features like Call All/Page All, to talk to radios without searching through your channel list.
7. Supports the use of repeater
Some on-site business systems use the 900MHz band, including the Motorola DTR 900MHz FHSS frequency hopping spread spectrum handheld radios, which operate at 1watt ERP transmit power on the 902-928MHz ISM band using frequency hopping digital voice. Current examples include the Motorola DTR600 and DTR700 radios, These radios operate with 50kHz channel spacing and 8-level FSK digital FHSS. 902.525MHz to 927.475MHz coverage.
Technical specs on Retevis' website: A mixture of DTR, DMR, and analog specs (LOL). At least they got the DTR freq range right!
Main technological specification
Frequency range | 902.525 - 927.475 MHz |
Channel Capacity | 30/50CH (up to 200) |
Channel Spacing | 25KHz/12.5KHz |
Operating Temperature | -25℃~+60℃ |
Operating Voltage | DC 3.7V |
Antenna Impedance | 50Ω |
Microphone Impedance | 2.2KΩ |
Battery | 1800mAh |
Dimension | 128×54×32mm
(No including antenna) |
Weight | 223g |
Transmission
Output power | 1W |
FM modulation | 25/16K¢F3E 12.5K/8K¢F3E |
4FSK digital modulation | 12.5KHz for data:7K60FXD 12.5KHz for data and voice :7K60FXE |
Vocoder type | AMBE++or SELP |
Digital Protocol | ETSI-TS102 361-1,-2, |
Harmonic | ≥70dB |
Signal-to-noise Radio(wide/narrow) | 25K≤-45 dB
12.5≤-40 dB |
Rated audio Distortion | ≥5% |
Frequency Stability | ±2.5ppm |
Max Frequency Stability | 12.5K≤-40dB |
Reception
Sensitivity (12dB SINAD) | Analog 25K≤-121dB 12.5K≤-119dB |
Digital 0.3μV/BER5% | |
Signal-to-noise Radio | 25K≥45 dB 12.5K≥40dB |
Adjacent channel selectivity | 25K≥65 dB 12.5K≥60dB |
Intermediation (Wide/ narrow) | 25K≥60 dB 12.5K≥55dB |
Spurious Response Rejection | ≥65 dB |
Audio power | 1W |
Audio distortion | <5% |
Frequency Stability | ±2.5ppm |
Battery life under 5-5-90duty | 14.8 hours(with 1600mAh Li-ion battery) |
20.9 hours(with 1600mAh Li-ion battery) | |
Epic FAIL.