The RaDAR Challenge – Proposed changes for 2015


1. Aim

The RaDAR “Challenge” is a unique event aimed at promoting the use of Rapidly Deployable Amateur Radio stations. This challenge is for all licensed radio amateurs not limited to South Africa. A RaDAR operator can take part in any of the three defined categories (See point 7) which may be changed at any time during the challenge. The points system is so structured as to encourage portable RaDAR operations, especially moveable RaDAR stations. Moveable RaDAR stations rely on fixed and portable stations as a point of contact using channelised frequencies. “Search and pounce” techniques are also allowed.

2. Date and Time

The first Saturday of April and first Saturday of November (4 April 2015 and 7 November 2015) starting at 00:00 UTC and ending at 23:59 UTC (Saturday 02:00 to Sunday 01:59 CAT) – 24 hours will give equal opportunity to the international community of RaDAR operators. RaDAR operators can define their own operating time schedule or remain active for the full 24 hours.

3. Bands and Modes

All amateur bands are allowed including cross band contacts via amateur radio satellites. Modes – CW, SSB, AM, FM or any legal digital mode. QSOs via terrestrial repeaters will NOT be allowed.

4. Suggested HF Calling frequencies

See for the latest international list of frequencies. The WARC bands can be used considering this is a RaDAR “Challenge” and not a contest as such. It provides better opportunities for RaDAR contacts during difficult propagation conditions.

Recommended digital modes frequencies – Refer to the SARL Contest Manual, General Rule 15.

5. Exchange

The RaDAR challenge requires more than a minimalistic information exchange. Accurate information exchange is considered more important than a large QSO count.

Call sign, Name, RS(T) Report, QTH and grid locator. Note the grid locator can change as RaDAR operators are allowed to move position at any time. The grid locator of six characters is acceptable but should preferably be accurate to 10 characters for higher position accuracy. Smartphone applications are generally used to establish more than a 6 character grid locator.

If working non participating stations, Call sign, Name, RST and QTH is acceptable.

6. Scoring

1 point per QSO.
Individual QSOs – per mode, per band, per satellite, per call sign.

If the moving RaDAR station has moved the required distance (See point 7) contact can be made with a previously worked station, again.

7. Categories and multipliers.

The following multipliers are applicable to determine the final score. If category / mode of transport changes were made during the challenge, than calculate accordingly.

x 1 – RaDAR Fixed station (At home or in another building)
x 2 – RaDAR Field station (Portable – away from home)
x 3 – Moving RaDAR station – See modes of transport, below.

Modes of transport and required movement distances (moving RaDAR stations only)

Vehicles, motorcycles and motorboats etc. (Motorized transport) – 12 km (Based on a 1:12 ratio to “on foot” operations)
Bicycles – 2 km
On foot and paddle canoes – 1 km
Wheelchairs – 500m

Aeronautical mobile stations are considered moving stations and can communicate at any convenient time.

Note: Moving RaDAR stations can move at any time but are required to move to the next destination after five contacts have been made from the present location. The move needs to cover the required distance before further contacts are allowed to be made. This requirement tests the ability to rapidly re-deploy your amateur radio field station.

Power multiplier: The latest ideas are that the RaDAR challenge is a test to rapidly deploy and operate an amateur radio station passing information accurately. It is not a QRP contest as such. The operator is free to choose his station configuration and power requirements. Therefore the power multiplier is now redundant.

9. Bonus points (All categories).

5 Points (The equivalent of five QSO’s) for a minimum of one satellite or any digital modes QSO involving a computer, smartphone or digital modes device. (For clarity thereafter 1 point per Satellite / Digital modes QSO).

5 Points for the first successful same continent RaDAR to RaDAR QSO (As may be confirmed by the extensive information exchange).

5 Points for the first inter continental (DX) QSO.

10 Points for the first successful inter continental (DX) RaDAR to RaDAR QSO (As may be confirmed by the extensive information exchange).

10. Log Sheets

The SARL RaDAR Contest manager – Eddie, ZS6BNE. Send email entries to edleighton (at) The closing date for logs is 14 April and 17 November 2015.

See https://tobepublished for a log sheet specifically designed for the 2015 RaDAR contest.

Note: A photo of the station (JPG format) MUST accompany every log entry. A photo is required for each new location that moveable stations move to. These photos are used to promote amateur radio and the RaDAR concept showing where amateur radio can be used to communicate from and in the many different ways.


Courtesy Mario, DL4MFM (November 2014)


73 de Eddie
Rapid Deployment Amateur Radio

Daring to be different

RaDAR – Learning through failure

I had prepared my kit and logistics and was ready for the RaDAR challenge for November the 1st, 2014.

I built this interesting antenna two weeks prior but due to family commitments I could not get out to test it. I hoped that it would work well as a multi band antenna using a tuner, at least down to 40m. Although designed as an effective “DX radiator” for the higher bands it certainly could not load on 40m! The antenna is way too long to be an effective rapid deployment antenna. Probably ideal for the DXer though. See


In desperation, I went to 20m and broke into a conversation to make a QSO or two. I got a RST 56 from both gentlemen but did sense a slight irritation after passing my grid info. I’m sure they wanted to carry on with their conversation uninterrupted.

Screenshot from 2014-11-03 09:56:49

I took advantage of the rule, “A RaDAR operator may move at any time”. Part of my strategy was to operate from a canoe on water. I’d never done anything like it – this was a first for me! I packed up and walked down to the local river and jetty. My canoe was placed there earlier.

Well the blue painters poles certainly made some people wonder! One chap asked me if I’m going to catch fish.


I didn’t even bother to pack the kit into the waterproof bag and just loaded my pack on board. Since I was last on the river doing a recce, the water level had gone down and I battled through a sand bank before reaching deeper water. I went downstream, the wind blowing strongly from the north.

It was a battle to get the other end tied to the reeds and the antenna tensioned. I got to the other side and maneuvered the canoe amongst the reeds so I could tie the end of my end fed to it and moved back into the middle of the river.


The end fed loaded OK but no one could hear me. I had to break into 59 nets for QSO’s but difficult as they aren’t listening for a weak QRP signal. I heard the VOX of a friend drop out and called his name – he heard his name but didn’t hear my call ….. I made no contacts from the river.


Homeward bound – in the name of RaDAR. Rather disappointed with my results. It was a challenge that I had set for myself. I will do it differently in the future. Of course, I’ll be back and try again until I get it right!

I’m sure a buddipole or similar antenna would work much better. There was nothing rapid about getting this antenna in place but I took on the challenge for fun. It was fun on the water especially as the sun set. I’ll be back with a better plan – for sure.


My RaDAR movements. On foot and on the water.

I went back inland and put up my “Fuchs” end fed and manual tuner as a sloper and called CQ.


I even went to the WARC bands. It made me think that this must be one of the rule changes for the RaDAR challenge – to include the WARC bands. RaDAR is more of a challenge than a contest! I was spotted in Brazil on 12m running 5W CW.  Rules ….. to be revised.



My last attempt.

The SARL Contest rule book revision submissions need to be in by the 10th of November, 2014. I will be submitting a few changes. RaDAR adapts and changes where changes are needed. Next year will be even better.

Learning through failure.