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DIRECTION FINDING FOXHUNT

July 21 @ 8:00 pm - 10:00 pm

After having to cancel the event on the 18th June, the club is arranging another VHF “Direction Finding” Foxhunt event in Ruislip Woods on the evening of FRIDAY 21st July 2017.  Please see full details below.

As Blackwell Hall in not available on the 21st July, members not taking part in the Foxhunt are invited to arrange an informal get-together from 8.00 pm at the Waters Edge pub, Ruislip Lido HA4 7TY, to await the return of the foxhunters.  (Be aware though that the car park is now Pay & Display, until 21.00 in the summer.)

The plan is that contestants assemble at the Woods entrance near the Junction of Broadwood Avenue and Kings College Road (grid ref TQ095 884, postcode HA4 7XT) at 1945, connect up / check out their equipment (144.525 MHz receiver and antenna) and wait for the first transmission at 2000. The fox will identify by callsign (probably G3EFX) using Frequency modulation phone (F3). The transmissions will be horizontally polarised with a maximum of one watt erp.

Ideally the receiver should be a portable SSB/CW receiver but an FM rig with a suitable S-meter or a VHF scanner should do the job*. The antenna needs to be portable and directional eg a 3-element yagi although a simple dipole might suffice. Contestants can be either singles or pairs eg one to operate the antenna/receiver and the other to read the map (laminated maps will be provided – please bring a felt tip pen). You will also need a compass.

Brian G3YKB have sse antennas for sale – £2 to £10 (see SALES/WANTED pages)

The winning team will be the team that finds the fox in the shortest time.

Please email () or phone (01923 228121) if you are planning to take part.

Note that this event is ENTIRELY ON FOOT – using a car could be construed as racing and hence invalidate your insurance.The maximum round trip (to the fox and back to the car park) should be less than four miles, possibly a lot less !! Although the main paths in Ruislip Woods are well maintained, beware of trip hazards eg tree roots, especially on the lesser used paths and tracks.

If you think you have to cross Ducks Hill Road, then PLEASE use the traffic lights controlled pedestrian crossing near the car park entrance. Ducks Hill Road is a busy road with a 50 mph limit.

The Fox station will NOT be hidden or camouflaged and the antennas will be crossed dipoles on top of a ten foot pole. If you find yourself needing a machete to hack away the brambles, you have gone the wrong way!

*Although not as sensitive as a regular receiver, an RTL SDR dongle (about £8 on Ebay) plus a tablet or smartphone could make a cheap portable receiver – try Ebay search “RTL2832U SDR R820T”   See  https://www.youtube.com/watch?v=PYG5INcF6_U   for an example of an RTL-SDR connected to a Samsung smartphone

After the event, we will probably adjourn to the Waters Edge Pub.

Details

Date:
July 21
Time:
8:00 pm - 10:00 pm

Venue

Ruislip Woods
Junction of Broadwood Ave/Kings College Road
Ruislip, HA4 7XT United Kingdom
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