Build a Simple Serial Port Interface

What is a serial port interface?

In simple terms, a serial port interface translates signals from a computer serial port to be used to place a transceiver into transmit or send CW (morse code) characters. A computer serial port usually has 9 pins, although some older PC’s may have 25 pin serial ports fitted. Both types carry out the same function, the only difference being the size and the pin connections. As it’s name suggests, a serial port sends data serially, in other words, each piece of data is sent one after the other. Read Complete Article...

Kenwood TS-850 Memory Backup Battery Replacement

Kenwood TS-850 Memory Loss

Because of the age of the design and components used, the circuit uses a RAM chip. Using RAM has a drawback in that it requires power to retain information. This power is supplied from a small memory backup battery. Modern designs use NVRAM (Non-Volatile RAM) which retain the information without requiring power. Read Complete Article...

Radio Propagation

Or how radio waves travel through the air…

As radio waves travel through the air away from the transmitter, the path they can take falls into five different types with each type having it’s own particular characteristics and effects on the radio signal. Each type is a method of propagation. All the types of propagation can be affected by geomagnetic events created by sunspots, solar flares and solar winds. Read Complete Article...

SignaLink True CW Keying

What’s a SignaLink?

A SignaLink is a small unit manufactured by Tigertronics which functions as an interface between a computer and transceiver to enable the use of digimodes. The latest version of the SignaLink connects to the computer using a standard USB cable. The connection to the transceiver is made by a RJ45 (ethernet) socket on the rear of the unit. The other end of the RJ45 cable is terminated to suit the radio. Wire jumpers inside the unit allow the SignaLink to be used with any radio. Tigertronics also supply pre terminated RJ45 cables and pre-configured jumper blocks. Read Complete Article...