Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Magnetic compass polarity reversal??
Hi,
I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! David |
#2
|
|||
|
|||
Magnetic compass polarity reversal??
On Sun, 13 Nov 2005 12:15:19 -0000, Vortex wrote:
I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass What do you want a compass for? You can get close enough to the azimuth by seeing where the sun is at about 1020GMT every morning. The sun will be a slightly lower than the satellites used by Sky at this time of year. -- Cheers Dave. pam is missing e-mail |
#3
|
|||
|
|||
Magnetic compass polarity reversal??
"Vortex" wrote in message ... Hi, I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! David I think the compass knows best, you might have got it wrong over which way is north. You could also try a GPS. Go and get yourself a cheap satellite locator instead, it will save hours of hit and miss work. |
#4
|
|||
|
|||
Magnetic compass polarity reversal??
In article ,
mark wrote: I think the compass knows best, you might have got it wrong over which way is north. If you don't know the differenc ebetween north and south in your own home you are *very* lost! ;-) I'd always get the direction spot on using an OS map. -- John Cartmell john@ followed by finnybank.com 0845 006 8822 Qercus magazine FAX +44 (0)8700-519-527 www.finnybank.com Qercus - the best guide to RISC OS computing |
#5
|
|||
|
|||
Magnetic compass polarity reversal??
mark wrote:
"Vortex" wrote in message ... Hi, I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! David I think the compass knows best, you might have got it wrong over which way is north. You could also try a GPS. Go and get yourself a cheap satellite locator instead, it will save hours of hit and miss work. Having just installed a satellite dish, unless you get a very expensive satellite locator it only tells you that you have located a satellite, not which one, as I found to my annoyance, ended up on Hotbird and wanted Astra2. In the end I mounted the dish on my workbench where I could see the TV, "tuned" it in using a Sky box to tell me which satellite, then made a careful record of direction and angle, moved the dish to the house, set it by my record, and heigh presto! |
#6
|
|||
|
|||
Magnetic compass polarity reversal??
Vortex was thinking very hard :
Hi, I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! It has been stored in a position with the needle unable to move and close to a magnet with an opposing polarity. In other words it has been remagnetised with the wrong polarity. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#7
|
|||
|
|||
Magnetic compass polarity reversal??
On Sun, 13 Nov 2005 14:50:15 +0000 (GMT), John Cartmell wrote:
If you don't know the differenc ebetween north and south in your own home you are *very* lost! ;-) Or just moved up here from the southern hemisphere and expects the sun to track to the north rather than the south. It's surprising how disturbing that can be, even if you don't consciously navigate by the sun. -- Cheers Dave. pam is missing e-mail |
#8
|
|||
|
|||
Magnetic compass polarity reversal??
In message , Vortex
writes Hi, I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! The earth has undergone polar reversal We're doomed, doomed I tell you -- geoff |
#9
|
|||
|
|||
Magnetic compass polarity reversal??
"Harry Bloomfield" wrote in message ... Vortex was thinking very hard : Hi, I'm looking at relocating my satellite dish next weekend. Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! It has been stored in a position with the needle unable to move and close to a magnet with an opposing polarity. In other words it has been remagnetised with the wrong polarity. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk Sounds plausible to me. To be clear the compass works fine, it's just 180 degrees out...so I achieved my objective, My dish location problem is caused by neighbouring trees which are much taller than they were 8 years ago... Also at the new location I need clear horizon between 28.2 East (SKY), and 13.0 East to cover Astra 19.2 and Eutelsat. ..........I have a winter of HDTV "anorakking" ahead. David |
#10
|
|||
|
|||
Magnetic compass polarity reversal??
"Dave Liquorice" wrote in
ll.com: Or just moved up here from the southern hemisphere and expects the sun to track to the north rather than the south. It's surprising how disturbing that can be, even if you don't consciously navigate by the sun. I checked something on astronomy software once set to South Africa, and Orion was upside down! It was a real shock, I don't know how they cope. Also the Sun was below the horizon - that must be a downer mike |
#11
|
|||
|
|||
Magnetic compass polarity reversal??
On Sun, 13 Nov 2005 12:15:19 -0000, Vortex
wrote: Just got out my trusty 30 year old SILVA compass to do a bit of surveying, and I've noticed the red (should be north) end of the needle is pointing south!! By way of confirmation the needle still "dips" to the north...it's just the wrong end of the needle that is both pointing and "dipping" to the north. Can anybody offer a plausible explanation for this? I'm mystified! I cannot come up with why the magnetization changed, but the dip I can explain. Compass capsules are made in North and South hemisphere types, possibly even equatorial. If a compass needle pointed direct to the North magnetic pole, it would point downwards at about 45 degrees in the UK. To counteract this, the needle is actually out of balance North to South, depending on which hemisphere it is made for. Perhaps it would be useful to a novice scout. Instead of joining the Reciprocal Club, he might actually get to his destination. John Schmitt -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Black & Decker drill/driver mains adaptor polarity | UK diy | |||
another name for "magnetic switch"? | Woodworking | |||
R*volume*raduis2 c3po "Theroy of everything" | Electronics Repair | |||
Magnetic sheilding | Electronics Repair | |||
magnetic chuck problem | Metalworking |