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Crystal Oscillator Transmitter

When I was initially tinkering with this circuit, it bothered me that I didn't include a resistor for the IRF510 bias.  When I added in a bias resistor the amplified signal was lost, so I got rid of it.  In general, a bad idea.  It turns out that if I spent some extra time reading the data sheet I would have noticed that the gate voltage bias for the IRF510 should be between 2 - 4v.

Approximate Specifications of the mcHF Transceiver for Firmware Version 0.0.219.27

based on a document from Clint Turner, KA7OEI

Because this is a software-defined radio and due to ongoing modifications/improvements of the software and hardware, the specifications continue to improve!

MCHF USB CAT and AUDIO Mode

db4ple edited this page 20 days ago · 27 revisions

 Pages 22

 

mchf Quick Operating Guide mchf快速上手手册

This document is useful if you are looking for a very simple guide how to operate the mcHF:

 

mchf灵敏度测试

mchf receive test by CMU200

1.-120dbm can hear +1khz ssb sound

2.-112dbm can hear and the mouant is in scope center.

3.-107.8dbm can hear and the mouant is in the top.

4.

MCHF发射功放调试注意事项指导思想

MCHF发射功放调试注意事项指导思想:功放级的偏压要先调好。然后分别校正5W和FULL档的功率值设定。偏压调整:分为PA BIAS和CW PA BIAS。一般两者的值调为一样。PA BIAS的调整:按TUNE进入发射状态,旋转编码器M3,调为50即可(必须在USB模式下)CW PA BIAS的调整:同样按TUNE进入发射状态,旋转编码器M3,调为50即可(必须在CW模式下)。如果功率管使用RD16HHF1,两者应该调为最大115的值。使用RD15HVF1则只能调为50,过大会引起大电流发射关机。5W档的功率值设定:接上功率表和假负载,在PA设置菜单里,把调谐功率设为5W档,按TUNE,在菜单里对应的波段5W档值调为输出为5W即可(5W PWR ADJ)。再把调谐功率设为FULL,在对应的波段FULL档值调为输出为10W左右(FULL PWR ADJ)。设定好后,记得长按F1保存数值。注意:如果BIAS调整过大引起发射关机。可以断开RF板上的RFC8,再把PA BIAS值调小即可。  MCHF-V0.4版本收发切换改为继电器的方法 1、 去掉K1边上的R26。2、 去掉C78,C81,直接从C78到C81短接一条线(接收通路)。3、 去掉RFC2,RFC3,D3,D4。

解决图像识别模块不识别TF卡问题

默认TF卡是没有启用的,所以插上TF卡是没没有反应,请看图片:

用电烙铁连接以后,如果把卡拔掉,是不能使用的,所以不用TF卡请断开这里,如果连上了,麻烦TF卡要一直插上哦!

 

rtl-sdr

Software

Much software is available for the RTL2832. Most of the user-level packages rely on the librtlsdr library which comes as part of the rtl-sdr codebase. This codebase contains both the library itself and also a number of command line tools such as rtl_test, rtl_sdr, rtl_tcp, and rtl_fm. These command line tools use the library to test for the existence of RTL2832 devices and to perform basic data transfer functions to and from the device.

Ubuntu下SDL安装及测试程序

  1. 安装
  2. $ sudo apt-get install aptitude autoconf
  3. $ sudo aptitude install mercurial
  4. $ hg clone -u SDL-1.2 http://hg.libsdl.org/SDL SDL-1.2
  5. $ cd SDL-1.2
    $ ./autogen.sh
    $ ./configure
    $ make
    $ sudo make install
  6.  

测试代码

#include <stdio.h>
#include <SDL/SDL.h>

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