Ham Radio



Yaesu Radio

Back to top

What is Amateur Radio?

A radio amateur means a person who is interested in the radio technique solely for a private reason and not for financial gain (non-professional) and to whom the Authority (ICASA in South Africa or FCC in the US) has granted an amateur radio station license and shall mean a natural person and shall not include a juristic person or an association provided that an amateur radio station license may be issued to an amateur acting on behalf of a duly founded amateur radio association.

The amateur radio service is defined by the International Telecommunications Union (ITU) as a radio communication service for the purpose of:

  • self-training
  • intercommunication
  • and technical investigations

carried out by amateurs, that is, by duly authorised persons interested in radio technique solely with a personal aim and without pecuniary interests.

Radio Amateurs, or "Hams" use two-way radio communication to make contact with other radio amateurs all over the world. They are even able to use satellites (and even bounce signals off the Moon) and on occasion speak with astronauts. Radio Hams can do this from home or while mobile in cars, boats or on foot.

Radio Hams have a full range or communication modes at their disposal. These include plain voice, Morse code, numerous digital computer modes and even graphical modes like television. As a licensed amateur radio operator, you will be able to join in experiments using all these modes.

Amateur radio can be enjoyed by young and old, male and female, even the most severely disabled can make friends around the world from their own home. This hobby knows no boundaries.

Using even the simplest of radio set-ups and antennas, amateurs communicate with each other for fun, during emergencies, and in contests. Through HAMNET they may be called upon to handle messages for police, Metro Emergency and other public service organisations during all kinds of emergencies.

Back to top

My Journey So Far

The seed was planted for me near the end of 2018 when I was thinking about how fragile our cellphone and technology links actually are. Any extended power outages, a disaster, government censorships of social networks, etc means communications can be cut off. I started thinking more and more about alternatives and amateur radio was the natural option as I realised more and more how it is used every day in the background where we do not see it. It is obviously not just about emergency use, but often used for well-organised social chats, experimentation, where no cellphone signals are present, communicating with people in distant countries, talking to the International Space Station, bouncing signals off the Moon, and much more. Prior to this I was very active on CB radio back in the early 1980's.

So I registered for one of the bi-annual 4-month courses that are offered in Cape Town and also online for the RAE exam which was next in May 2019 (also only twice a year in South Africa). The course went into lots of depth on regulations, radio procedure, electronics, RF propagation, RF interference, filters, amplifiers, Q codes, phonetic alphabet, and lots more. To qualify we also had to do a practical HF (High Frequency Bands below 30 MHz) assessment which included setting up an HF radio and antenna and making 5 HF contacts (QSOs) on the air. The great thing also about going on the course (apart from being better prepared) is also about getting to know a few other fellow new hams.

I took a week of leave before the exam to do my final preparation and finally the day of the exam dawned on 18 May 2019. About a week after this our results were published and I had a pass, and I became ZS1OSS! Ham call signs follow this standardised syntax ZS would be a single or double alphabetical character for your country, the numeral following is usually a geographic region so 1 in our case is Western Cape, and the last 1 to 3 alphabetical letters you get to choose if they are available, and in my case the OSS standards for Open Source Software in case you wondered. In South Africa ICASA sets the reguations, and we must transmit our callsign with every transmission, whereas in the USA they only have to do it every 10 minutes.

Since then, I have called in on the weekly news bulletins every Sunday morning and did my first SSB simplex chat with a colleague from work. I'm easing my way into the chats and still need to tune my antennas a bit better before I can expand wider. I've also set myself up on JS8 digital mode, and joined the Western Cape branch of HAMNET for volunteer emergency communications and events.

I did have some challenges getting my Kenwood radio to connect to the SARTrack software due to differing baud rates, different COM ports, and TNC settings so I made a 5-minute video explaining which settings to sue at https://youtu.be/z6KLYRv_rX0.

Back to top

My Equipment

  • Base rig 1 - Yaesu FT-991A HF/VHF/UHF All Mode Transceiver
  • Base rig 2 (and mobile HF) - Icom IC-7100
  • Portable 1 - Anytone AT-D878UV Digital DMR VHF/UHF with Roaming and GPS, with Nagoya NA-701 antenna
  • Portable 2 - Yaesu FT-60R VHF/UHF
  • Mobile 1 - TYT TH-7800 50W VHF/UHF Full Duplex, Cross-Band Repeater
  • Mobile 2 - Kenwood TM-D710GA with built-in APRS and Echolink (maybe replacing Mobile 1)
  • Antennas:
    • Watson W-30 Colinear VHF/UHF base antenna
    • Homebrew VHF quarter-wave (works best actually) which sits inside my house's roof
    • MFJ-1778M G5RV Junior Wire Antenna 40m-10m
    • Nagoya UT-308UV VHF/UHF magnet mount antenna for portable if I need to use a radio in someone else's car
    • Comet SBB-1 16" dual-band mobile (primary mobile antenna on my car) on a Comet LD-5M lip mount
    • Shark Mono Band Verticals Mini 40m 36" (HF mobile antenna for car) on a Diamond Antenna K400-3/8C lip mount
    • Comet CHA-250B HF Vertical Base Antenna 6 Meter Through 80 Meters
  • ATU - MFJ-993B Auto Tuner 1.8-30MHz
  • FAA-450 Antenna Analyser (EU1KY)

Watcon antenna and dipole
The Watson W-30 Colinear antenna with my homebrew inverted V wire dipole antenna

Back to top

See my Winlink page.

Back to top

How to Configure APRS in South Africa

See my APRS page.

Back to top

JS8Call Digital Mode

JS8Call is open source software providing digital text messaging over weak radio signals spanning continents. See JS8Call Digital Mode where I also have to link to some useful messages to use in tactical situations.

Back to top

Listen to local hams in Cape Town via OpenWebRx

I have set up an open source OpenWebRx service on a Raspberry Pi which monitors various frequency bands from my home. You can listen to it by going to http://www.gadgeteerza.co.za:8073/. OpenWebRx actually has a number of such receivers around the world that you can listen to and you will find the directory at https://www.receiverbook.de/ where my station is listed too.

The following could be interesting to listen to on my station and are all marked with yellow bookmark tags along the top of the waterfall display. On the right-hand lower part of the screen is a control display which allows you to change the band, volume, squelch, mode type, etc. But clicking on the yellow tabs should set the mode correctly for you. Don't be afraid to play with it as it is receive only and won't damage anything:

  • RTL-SDR 2m VHF Digital = APRS stations beaconing location information around Cape Town which includes cars/trucks, weather stations, repeaters, etc and displays the data they are transmitting. So weather stations will show weather info whilst cars/trucks will show location, speed, direction, etc. If there is an emergency operation or rescue on, you may see the portable tracker units reporting in via radio. There is also an International Space Station (ISS) voice frequency here for when they pass over Cape Town but you may only hear the astronauts speaking as the uplink frequency is on 145.200 MHz FM.
  • RTL-SDR 2m VHF Digital = 144.300 USB for Wednesday HAMNET bulletins at 16:30 UTC/GMT (apart from 1st Wednesday of the month which is a physical or virtual meeting).
  • RTL-SDR 2m Voice = Five Repeater Stations (you'll hear bulletins Sundays 06:30 and 17:00, Mondays at 18:00, Wednesdays at 16:30 (all UTC/GMT times so add 2 hours for local SA times).
  • RTL-SDR 70cm UHF Digital = Helderberg DMR which is 24/7 International DMR Channel 91, and the Internation Space Station (ISS) on 438.800 MHz when it passes over. This is a cross-band repeater facility so you'd hear hams from far away talking up to the ISS and we'd hear them here on this frequency.



Back to top