From Neil.Pickford@aph.gov.au Thu Dec 7 04:38:03 2000 From: Neil.Pickford@aph.gov.au (Pickford, Neil (DPRS)) Date: Thu, 7 Dec 2000 14:38:03 +1100 Subject: [FoxHunt] Thursday 7th Still on Message-ID: <6D89B67D0CAFD111BFE308002BB91CD4097ECB37@mail1.parl.net> I plan there will be a hunt Tonight 7/12/2000 Even though the weather looks dodgy, If it is raining/hailing at 6 PM I will call it off, otherwise it will still be on. This one will start in Weston Park Yarralumla in the car park adjacent to the MAZE & next to the railway. First fox will be on 146.200 MHz as per usual. Spare equipment will be available from the start location. Start time will be 6:30 PM and if you like, be prepared for a BBQ afterwards Neil Pickford VK1KNP From kmr@adfa.edu.au Thu Dec 7 05:23:10 2000 From: kmr@adfa.edu.au (Kerry Richens) Date: Thu, 07 Dec 2000 15:23:10 +1100 Subject: [FoxHunt] Darnit. cant make it again!! Message-ID: <3.0.6.32.20001207152310.00946550@octarine.cc.adfa.edu.au> Hi. I was looking foward to coming but have to cancel due oto family commitments. Sorry Guys!! ---Kerry Richens.----------Senior Technical Officer (Electronics)------- School of Chemistry, University College Australian Defence force Academy. Northcott Drive, Campbell A,C,T. 2601 Work--> http://www.ch.adfa.edu.au/OzChemNet/ChemDept/staff/kr/kr.html Ham---> http://www.qsl.net/vk1tkr/index.html PH: +61 6 268 8947 Fax: +61 6 268 8002 \\|// (o o) --------------e-mail: k-richens@adfa.edu.au ------------oOO--(_)--OOo--- From neilp@goldweb.com.au Sun Dec 10 07:21:29 2000 From: neilp@goldweb.com.au (Neil Pickford) Date: Sun, 10 Dec 2000 16:21:29 +1000 Subject: [FoxHunt] Report 7/12/2000 Message-ID: <3A3320E9.D555098A@goldweb.com.au> Fox Hunt Report for Thursday 7th December 2000. This Hunt took place in Weston Park Yarralumla starting at the Maze carpark. The Fox went on air at 6:45 pm and only one hound was at the meeting point. John VK1ET set off on foot followed by Neil VK1KNP who decided to test an antenna and sniffer that was part of Tom VK1BUDs deceased estate. Although Neil knew the location of the fox, normal techniques with TOM's antenna and the hand held did not work until we figured out it was a null type antenna. Two equal length folded dipoles connected antiphase with same length matching sections. Even having figured out the principle did not help greatly as there is no front to back discrimination of the signal. The fox had been placed on the far side of Yarralumla Nursery and we encountered the chain mail fence which appeared to be radiating the fox signal. This further confused the readings out of the Null antenna. As murphy's law would have it, we picked the long way around the fence ending up 1/2 way back to the starting location before clearing the obstacle at the lakes edge. After about 1/2 an hour the fox was located in a heap of garden mulch by John. Neil was still trying to figure out the operation of Toms sniffer at this time. Tom's sniffer is an amplified tuned diode detector circuit with a large 1 ma analog meter. The meter works well at showing the nulls but it takes a bit more practice to interpret the peaks. John took the fox and hid it nearby, while Neil retuned and looked at the calibration of the sniffer. Then Neil used Tom's equipment to find the Fox. All was going well with Neil following a strong null until he realised that he was DFing Black Mountain Tower, not the Fox. A quick retune of the sniffer yielded multiple null directions, some towards Black Mt and others slightly divergent. The divergent signals were followed and after a big spiral in on the fox location a mysterious heap of cut grass below a tree was investigated, No Fox! Further Dfing showed the fox to be up the tree. Neil had been fooled by the obvious red herring John had placed. It was found that pointing the folded ends of the the dipoles of the null type antenna directly at the source causes the null to disappear. This can be used in the near field to determine if the fox is up or down. Finally John had a try of Tom's equipment after Neil re-hid the fox. Similar problems with Black Mt were experienced drawing John well off course. Once John was within 40 m of the fox he began to get better readings leading him to the base of a tree. After searching the grass, John found it hard to decide if the Fox was indeed up the tree, however after some careful Null replotting he determined it had to be in the grass, and this time found the Fox. Neil and John retired for a BBQ after the 3rd Hunt. This was probably the last Hunt for this year, although if there is serious interest on the reflector I may schedule another one before January 2001 All the best for Christmas Neil VK1KNP From Peter.Ellis@cbr.defence.gov.au Tue Dec 12 23:34:34 2000 From: Peter.Ellis@cbr.defence.gov.au (Ellis, Peter R.) Date: Wed, 13 Dec 2000 09:34:34 +1100 Subject: [FoxHunt] SEC: UNCLASSIFIED - A 'real' fox Message-ID: <63A11916E379D21199300000F81A33E50A909D2A@r1clex01.cbr.defence.gov.au> Neil and others, I have a practical 'fox' for you. While I sit in my shack trying to listen to the new AO-40 satellite on 145.899+-, there is a chirp tone that JUST moves the needle on my IC-260A (fed from either the quarter-wave or 5/8. It's about a 1 second interval. It seems to sit on 145.8995 when I use USB. Please feel free to walk the streets around my place and find where the wretched thing lives. My guess: the timing circuits of a clock in a piece of electronic equipment in a house nearby. Is anyone interested in tracking it down? Would you loan me your equipment and teach me how to do it? With thanks in anticipation, Peter Ellis 22 Belconnen Way VK1KEP PAGE ACT W-62663901 H-62540262 From kmr@adfa.edu.au Wed Dec 13 01:05:50 2000 From: kmr@adfa.edu.au (Kerry Richens) Date: Wed, 13 Dec 2000 11:05:50 +1100 Subject: [FoxHunt] Peters problem blip!! Message-ID: <3.0.6.32.20001213110550.00d584c0@octarine.cc.adfa.edu.au> Assuming that you have turned off all of your gear in the shack! sounds like a fine task. If theres no hunt this thursday I'll borrow a sniffer from neil. ---Kerry Richens.----------Senior Technical Officer (Electronics)------- School of Chemistry, University College Australian Defence force Academy. Northcott Drive, Campbell A,C,T. 2601 Work--> http://www.ch.adfa.edu.au/OzChemNet/ChemDept/staff/kr/kr.html Ham---> http://www.qsl.net/vk1tkr/index.html PH: +61 6 268 8947 Fax: +61 6 268 8002 \\|// (o o) --------------e-mail: k-richens@adfa.edu.au ------------oOO--(_)--OOo--- From Peter.Ellis@cbr.defence.gov.au Wed Dec 13 05:32:07 2000 From: Peter.Ellis@cbr.defence.gov.au (Ellis, Peter R.) Date: Wed, 13 Dec 2000 15:32:07 +1100 Subject: [FoxHunt] SEC: UNCLASSIFIED - Re: Peters problem blip!! Message-ID: <63A11916E379D21199300000F81A33E50A909D34@r1clex01.cbr.defence.gov.au> All, > Assuming that you have turned off all of your gear in the shack! sounds like a fine task. I've had it there with nothing else on... (including flouro lights, and that my computers were stone-cold) Did I mention that I've heard it 'START'... ? > If theres no hunt this thursday I'll borrow a sniffer from neil. Let me check Thursday evening and get back to you (all.) Peter -----Original Message----- From: Kerry Richens [mailto:kmr@adfa.edu.au] Sent: Wednesday, 13 December 2000 11:06 To: FoxHunt@happy.emu.id.au Subject: [FoxHunt] Peters problem blip!! Assuming that you have turned off all of your gear in the shack! sounds like a fine task. If theres no hunt this thursday I'll borrow a sniffer from neil. ---Kerry Richens.----------Senior Technical Officer (Electronics)------- School of Chemistry, University College Australian Defence force Academy. Northcott Drive, Campbell A,C,T. 2601 Work--> http://www.ch.adfa.edu.au/OzChemNet/ChemDept/staff/kr/kr.html Ham---> http://www.qsl.net/vk1tkr/index.html PH: +61 6 268 8947 Fax: +61 6 268 8002 \\|// (o o) --------------e-mail: k-richens@adfa.edu.au ------------oOO--(_)--OOo--- _______________________________________________ FoxHunt mailing list - mailto:FoxHunt@happy.emu.id.au http://happy.emu.id.au/mailman/listinfo/foxhunt