Christmas FoxOr

The club Christmas event was a FoxOr event with twist: The circle only tells you where you might hear the 1st FoxOr in a string or chain of FoxOrs. Once you find the first one, you should be able to hear the 2nd, and so on. Here’s the map the competitors saw:

You don’t know quite how long the chain you’re on currently is, other than it is between 1 and 5 long. In fact the chains were A=4, B=5, C=3 & D=1. I only had 13 transmitters!

You know there are 6 FoxOr frequencies to choose from, and a chain will never repeat a frequency (but between chains will, of course). You also know that as you follow out a chain, the next frequency will always be higher. In this case they were
A = 144.25, 144.75, 145.50, 145.70
B = 144.00, 144.75, 145.30, 145.50, 145.70 (144.00 was a mistake, was meant to be 144.25, but competitors knew beforehand)
C = 144.25, 145.30, 145.70
D = 144.25

Here’s the TX locations:

Things that went well:
– All the transmitters worked and could be heard.
– Nothing was stolen. Apparently some intrigued neighbours.
– The chain with the FoxOrs closest together (A), was perhaps the more difficult.
– There were transmitters people could visit when picking up TXs after that they hadn’t been to when competing.
– Noone had to be rescued.

Things that went not-so-well:
– Some considered it a bit hard to understand, or DF, or read the map.
– Grumbles about blackberries and fences on the A chain, but frankly these things were both self-inflicted. Read the map:)
– It was too long. No-one found all TXs, best was 9/13. I didn’t want too much interference between chains that could be confusing, so they had to be well separated, but that made it a bit long.
– FoxOr C-2 on 145.30 was (deliberately) 50% duty cycle, but could be heard over nearly the whole map. It was in the highest location (Essex Heights), and being a Sprint-TX in ‘FoxOr mode’ appears to have a bit more oompf. It’s only 1 range higher on the YNG sniffers, but that seems to make a big difference. In retrospect, lucky it was on a On/Off duty cycle. FoxOr C-3 was also a Sprint-TX, in Homing Beacon mode, but wasn’t as high up, so wasn’t as much of an issue.

Here are the full results:

NameTXsTX Penalty (mins late)Time (mins)
Monica987
Bryan886
Alistair890
Darian781
Geoff490
Jack355
Di & Henk4-292
Suzanne228
Pierre261
Mark273
Emily275

STEAMing ARDF

From Monica Lo Presti –  a teacher at Dromana College,

Dromana College offers a STEAM enhancement class for Year 7 and 8 students before school once a week. This term, students began to look at some of the basics of electronics, and even built their own crystal radio from a kit. As part of this program, one of the teachers in charge asked me if I could run a session based on my experiences with amateur radio and ARDF. As a result, on Tuesday 8th August I was able to speak to the students about what Ham radio is, and the activities that those with and without an amateur licence can participate in.

After running through the basics, and showing a short video from one of the Mount Gambier foxhunting championships, students were shown a fox-or transmitter, and how to use a sniffer to find it. I set up a course of five transmitters that were hidden around the school that students then worked in pairs to find. There were varying levels of success with most groups finding at least two transmitters, while some were able to find all five. Some groups also struggled as an unknown source was transmitting a signal in one corner of the course.

Overall students had lots of positive feedback for the morning. Many commented on how much fun they had, along with enjoying the practical nature of the event and excitement of finding the transmitters.

Monica