30-01-2013, 03:27 PM
These are also known as Terrier Finders, and as the owner of a Russell/Border Terrier Cross, I know from bad experiences the aggravation of trying to find, then dig out, a terrier...
They work at 457khz, which is the international standard for radio detection in applications such as avalanche beacons etc. Range is about 20mtrs - ALL ferret/terrier finder applications work at this frequency be it analogue or digital (e.g. the Deben range).
I would have thought that you could build one as a modulated AM xmtr with some ease and use a directional aerial on the locator...
See https://www.bellmanandflint.co.uk/ and http://www.deben.com/terrier-finder.html etc. About 200+ quid to buy a whole system (collar on own is about 80 quid), much less to make yourself... plenty of comments out there if you Google "diy avalanche beacon"...
I have a border RF fence round our property to keep both our dogs inside the boundaries - the dogs have a collar that vibrates when the are 2mtrs from the fence, then lets them know rather more firmly (small shock) when they get within 1mtr - after the first couple of times they won't even go near the fence, even if their collar battery is flat
p.s. These collars are legal in England & Scotland, but not Wales. p.p.s. Not approved anywhere for use on children...
HTH
They work at 457khz, which is the international standard for radio detection in applications such as avalanche beacons etc. Range is about 20mtrs - ALL ferret/terrier finder applications work at this frequency be it analogue or digital (e.g. the Deben range).
I would have thought that you could build one as a modulated AM xmtr with some ease and use a directional aerial on the locator...
See https://www.bellmanandflint.co.uk/ and http://www.deben.com/terrier-finder.html etc. About 200+ quid to buy a whole system (collar on own is about 80 quid), much less to make yourself... plenty of comments out there if you Google "diy avalanche beacon"...
I have a border RF fence round our property to keep both our dogs inside the boundaries - the dogs have a collar that vibrates when the are 2mtrs from the fence, then lets them know rather more firmly (small shock) when they get within 1mtr - after the first couple of times they won't even go near the fence, even if their collar battery is flat
p.s. These collars are legal in England & Scotland, but not Wales. p.p.s. Not approved anywhere for use on children...HTH
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