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LimeSDR射频前端扩展板LimeRFE

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发表于 2019-4-17 10:43:58 | 显示全部楼层 |阅读模式

LimeRFE
An RF Front End Module for the LimeSDR Platforms
limefem-render-front_png_content-body-gallery.jpg

limefem-render-back_png_content-body-gallery.jpg

limefem-render-front_png_project-main.jpg

A Complete Solution for Custom HAM, Cellular, and Wideband Networks
The Lime RF Front End (LimeRFE) is a power amplifier (PA) module with appropriate filtering and support circuity to augment the LimeSDR, LimeSDR Mini, and LimeNET Micro platforms to form a complete solution to address real life applications, ranging from HAM radio to standards-compliant cellular network implementations.

Software-defined Front End
A single LimeRFE covers three very different sets of bands: HAM, cellular, and wideband. The exact band used at any given time is software-selectable. By making the RF front end definable in software, LimeRFE is the next step in the evolution of software-defined radio.


LimeRFE render front (left) and back (right)

Features & Specifications
HAM Bands
No.        Name        Frequency (MHz)        Output P1dB (dBm)*
1**        HF**        1.6 – 30**        35
2        2 m        144 – 146        36
3        70 cm        430 – 440        34.5
4        23 cm        1240 – 1325        30.5
5        13 cm        2300 – 2450        33.5
6        -        3300 – 3500        26.5
* Preliminary estimates of 1-dB compression point

** See note below about HF bands

A Note About HF Bands
Depending upon the application and overall system configuration, additional filtering may be required for use with HF bands. In particular, HF is not one, but ten bands starting at 1.6 - 1.8 MHz and moving up incrementally to 28.0 - 29.7 MHz. On-board filtering will attenuate signals greater than 30 MHz, but not Tx harmonics, or out-of-band Rx signals below this. Whether you need additional filtering could depend on things like use of external power amplifiers with integrated filters, antenna tuning units, and the environment (e.g., presence of nearby HAMs operating on other HF bands).

Cellular Bands
No.        Name        Duplex        Downlink Freq. (MHz)        Uplink Freq. (MHz)        Modulated Output Power (dBm)
1        Band 3/DCS-1800        FDD        1805 – 1880        1710 – 1785        24
2        Band 2/PCS-1900        FDD        1930 – 1990        1850 – 1910        24
3        Band 1        FDD        2110 – 2170        1920 – 1980        24
4        Band 7        FDD        2620 – 2690        2500 – 2570        24
5        Band 38        TDD        2570 – 2620        2570 – 2620        24
Wideband Channels
No.        Frequency (MHz)        Output P1dB (dBm)*
1        1 – 1000        27.5
2        1000 – 4000        25.5
* Preliminary estimates of 1-dB compression point

Filtering
Each band has appropriate filtering both for RX & TX
Selectable AM/FM notch filter
Fully Open Source Software
Firmware
API support
GUI
LimeSuite integration
Control & Configuration
Programmable via Arduino IDE
Arduino Nano-compatible microcontroller (ATmega328)
FT232RL USB-to-serial converter
Host serial connection via USB mini Type B connector
Power & SWR Meter
1 – 4000 MHz power & SWR meter (external directional coupler required)
Cellular bands TX power meter (internal coupler)
10-pin Interface to SDR
Power and ground
I2C (SDA and SCL)
2x GPIO connected to on-board microcontroller
4x bi-directional level shifted I/O
1.2 – 5.5 V
Each I/O has a high voltage and power Darlington drive stage for inductive loads (e.g., coaxial relays)
Individually switchable direction (input/output)
Power Supply
Single 12 V supply
Optionally supply microcontroller and RX channels via USB


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 楼主| 发表于 2019-4-17 10:44:17 | 显示全部楼层
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发表于 2019-4-19 17:33:09 | 显示全部楼层
emmmm。。。30dbm左右的功放还是蛮有吸引力的,就是Limesdr上原有的巴伦怕不是要被拆掉了,原生优化里面并没有包含30M以下频段和3GHz+频段。。。
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发表于 2019-6-20 11:15:52 | 显示全部楼层
这个不知道真的做出来是多少银子,430-440MHz频带能有34.5dbm,这个功率不小啊,应该能够传个几百公里了吧(野外)
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