Skip to main content

Useful websites

These are some pages / links / files / videos / youtube channels that I found to be very useful.

YOUTUBE CHANNELS 

https://www.youtube.com/user/w2aew

https://www.youtube.com/user/EEVblog

https://www.youtube.com/user/KF5OBS

https://www.youtube.com/user/vk3ye

https://www.youtube.com/user/K7AGE

https://www.youtube.com/user/TheSignalPathBlog

https://www.youtube.com/user/LinearTechnology/videos

https://www.youtube.com/user/jeriellsworth

https://www.youtube.com/user/txfactorshows

https://www.youtube.com/user/CCCen

https://www.youtube.com/user/keiouniversity

https://www.youtube.com/user/devttys0

https://www.youtube.com/channel/UCUWLnUZllytlcCFd93tnBzw/videos

https://www.youtube.com/user/balint256


SOME USEFUL BLOGS & WEBSITES


Amateur Radio Stuff 

http://www.qsl.net/va3iul/

http://www.vk2zay.net/

http://ludens.cl/

https://sites.google.com/site/vk3bhr/home

http://n5dux.com/ham/files/pdf/

http://www.rftibe.blogspot.in/

http://ag1le.blogspot.in/

http://www.qsl.net/pa3ckr/

http://www.qsl.net/pa2ohh/

http://www.w5jgv.com/

https://aa7ee.wordpress.com/

http://vk2zrm.no-ip.org/Page%205.htm

http://users.telenet.be/on4qz/index.html

http://www.vk3um.com/

http://hfsignals.blogspot.in/p/about.html

http://www.phonestack.com/farhan/

http://www.ka9q.net/

http://amoghdesai.com/

http://www.qsl.net/dl4yhf/spectra1.html

http://www.ac6v.com/

http://www.southgatearc.org/


General Electronics , Communication etc

http://www.edn.com/


http://www.radio-electronics.com/

http://www.microwaves101.com/


Signal Processing 

http://www.gaussianwaves.com/

http://www.dsplog.com/

http://www.dsprelated.com/


Space , Radio astronomy etc

http://www.svengrahn.pp.se/


http://www.hobbyspace.com/Radio/radio2.html

http://www.uhf-satcom.com/

http://www.radiosky.com/

http://www.zarya.info/

http://amsat-uk.org/

http://www.qsl.net/dl4yhf/speclab/earth_venus_earth.htm

http://www.dd1us.de/spacesounds%205.html

http://www.ok2kkw.com/eme1960/eme1960eng.htm

http://www.planetary.org/blogs/emily-lakdawalla/

http://www.setileague.org/

http://www.setileague.org/eme/eme2001.pdf

http://hireme.geek.nz/dsn-at-home.html

http://www.astrosurf.com/luxorion/qsl-mars-communication3.htm

http://www.boulder.swri.edu/~tcase/NH%20RF%20Telecom%20Sys%20ID1369%20FINAL_Deboy.pdf

http://www.pe0sat.vgnet.nl/



BOOKS


Crystal Sets to Sideband


The Scientist and Engineer's Guide to Digital Signal Processing
















Comments

Popular posts from this blog

Bias tee modification of HiLetgo RF amplifiers

Hi folks, There are some inexpensive RF amplifiers available in the hobby market by various names. They may be called LNAs, if you consider 3 dB noise figure as low noise. I purchased two of them from Amazon from a seller called HiLetgo. However documentation is sparse and the design is not all that great. People have had frustrating experiences with this type of LNA. Information regarding power supply to this board is practically non-existent, with voltage suggestions ranging from 5V to 12V ! Some even obtained the "magic smoke". Nonetheless they are reasonably cheap and therefore modifications can be done to make them useful. Let us now take a closer look at the board. Figure 1. The amplifier without any modification. Fig.1 shows the board without any modification. There are two SMA connectors and provision to externally power the board. The active element is an MMIC, with N02 as the marking. Other users have identified the MMIC as INA-02184 from HP. It seems to m...

Some experiments with double balanced mixers and GNURadio

Hi all, This post is all about frequency mixing , specifically double balanced mixers using diodes or ring mixers , commonly used in communication circuits . The circuit diagram of a ring mixer is given below . (Courtesy : Radio-electronics  ) Schematic of a double balanced mixer.  As you can see , this makes use of two transformers and a four diodes . For most of the HF work , switching diodes like 1N4148 suffice . However , for better performance Schottky diodes like 1N5711 can be made use of . For more information on the working of this mixer and construction aspects , I strongly recommend the excellent video by W2AEW on ring mixers given below .  So what I wish to explain in this video is a set of experiments carried out using a double balanced mixer which I shall call DB mixer for convenience :) The test gear consists of a DDS VFO , a crystal Colpitts oscillator , a variable  power supply , CRO , RTL-SDR and the PC sound card . The software tool...

RECEIVING SSTV FROM ISS ! Steps involved in decoding when using MMSSTV ......

A very interesting mode in ham radio is SSTV and more interesting is the SSTV from ISS - the International Space Station ! Receiving the images from ISS is pretty simple . However many hams have some problems recording SSTV audio and decoding them using MMSSTV . My ham friends like OM Ramesh VU3RGB , OM Sulaiman VU3SMQ and OM Dhanesh VU3DHN encouraged me to make a blog post describing the various steps involved . 1) The first step is simple . Just tune to 145.800MHz in your VHF receiver and record the audio using some device like your smartphone,holding it near to your rig .It is better to use SDRs like RTLSDR to record audio using a computer. However my shack PC is QRT now , so ,I can't use SDR . Anyway be sure to use some excellent satellite tracking software like the Hamsatdroid (Android) or Orbitron (Windows) to guide you in tracking the ISS . 2) After recording , copy the recorded .amr file to your PC from phone . Use some tool to convert the amr to wav file . One excellen...