/hamradio/ - Electronics

I'll take a look.

>>319

Writer here.

I really appreciate the help. I just didn't know if /hamradio/ would want to help or not, considering I'm from /k/.

>>320

Well there is at least one person's worth of overlap here. :)

I'm always ready to help bring more people to the hobby :)

Downloaded looks great

Bump for help.

sweet! thanks for the file.

just what I was looking for

Thanks!

Contributing:

CW (Continuous Wave)

Also known as On Off Shift Keying.

The most common form of O.O.S.K is Morse

code. It's known for being the absolute simplest and most efficient way to send and receive messages across the ether.

It is possible to construct a working HF CW set for only a few tens of dollars and use it to contact stations thousands of miles away. The efficiency of CW is of particular benefit to operators who use simple low-powered stations.

CW has superior bandwidth efficiency, using only a few hertz of the spectrum.

In 1966 when prisoner of war Jeremiah Denton, brought on television by his North Vietnamese captors, Morse-blinked the word TORTURE. You never know when it will come in handy strelok!

Keep It Simple Stupid seems to be the best way for me to describe Morse code.

PSK31

Or Phase Shift Keying (At 31 baud)

Think of it as CW's fast and cool brother. It's a digital mode that most people send it using soundcard on their PC (audio out) to their radio (audio in).

It has built in error correction, so if the person receiving is plagued with interference or fading, they’ll still be able to make out most of the transmission.

How does it work? With phase shift keying, When the signal is present and "normal" we call it a 1. However, when we FLIP the signal wave upside down (so the peaks are valleys and the valleys are now peaks), We call that a zero.

Side note!

Why do we change the amplitude and make it sound warbly? Believe it or not but a carrier by itself does not take any bandwidth! It's the change in carrier!

So if we "SLAM" a signal 180degrees out of phase, it will have infinite bandwidth and interfere with other people. If we do it over time, it takes far less bandwidth.

The same applies to CW. If we turned our transmitters instant on and instant off, it would splatter everywhere. By giving it some "shape" and slowly rising and falling to zero. It takes far less bandwidth. For example 5Hz. And in the case of PSK-31 >100Hz.

HELLSCHREIBER

One of my favorites, because it reminds me of an Enigma machine for some reason. While mostly novelty, think of it as RTTY but with ticker tape instead.

Encoding and decoding of this mode can be done with a PC and a sound card. This simple mode is easy to use and tune! It is suited to HF since it does not use 'sync' and you can pick out the text by eye, even in high levels of background noise!

A quick addendium to the CB section.

While CB radio can talk around the world, It is usually during years with high sunspot activity (Yes strelok, the sun does charge up our atmosphere). Most people who using CB and 11 meters to talk around the world use "SSB" or Single Side Band.