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Hi Unit_399,

Thanks for replying...

The antenna is approximatly 6inches long and attached by a plectrum to the back tail feathers of the bird I am flying, which this season is a Harris Hawk...

So depending upon whether the bird is on a kill (down at ground level) or perched in a tree depends upon the height of the antenna... this is one variable that cannot be controlled...

The rig cannot be controlled all that much, as the transmitter is limited by weight and only weighs 3 grams anything heavier can restrict the birds flying ability...

The units are brought in, at the pre-set frequency...

The usual distance required is around 5 miles although the manufacture does state that 20 miles is possible... but this must be line of sight and depends upon the bird it is being fitted to a Harris Hawk for instance will not usually travel too far upto 5 miles no more, but a sparrow hawk etc can go much further and 20 miles is possible...

The dedicated receivers can cope with the signal to noise ratio, hence I am convinced that a solution exists as how else can they overcome the same problem...

Only 173MHz is the bio-telemetry wavelength that we all use, the american version of 216MHz is I beleive now a DAB radio station the only other less used frequency is 433MHz as I beleive German and Finish Falconers use this frequency and a handfull of british falconers...

So will a pre-amp and filter arrangement fitted between the Yagi and Receiver help in any way...

I will gladly build any suggestions and give them a try as I do not wish to pay out £450+ for a receiver when I already have one to hand...

So what options are available to me...

<blockquote data-quote="hawk1943" data-source="post: 299702" data-attributes="member: 20784">Hi Unit_399,Thanks for replying...The antenna is approximatly 6inches long and attached by a plectrum to the back tail feathers of the bird I am flying, which this season is a Harris Hawk...So depending upon whether the bird is on a kill (down at ground level) or perched in a tree depends upon the height of the antenna... this is one variable that cannot be controlled...The rig cannot be controlled all that much, as the transmitter is limited by weight and only weighs 3 grams anything heavier can restrict the birds flying ability...The units are brought in, at the pre-set frequency...The usual distance required is around 5 miles although the manufacture does state that 20 miles is possible... but this must be line of sight and depends upon the bird it is being fitted to a Harris Hawk for instance will not usually travel too far upto 5 miles no more, but a sparrow hawk etc can go much further and 20 miles is possible...The dedicated receivers can cope with the signal to noise ratio, hence I am convinced that a solution exists as how else can they overcome the same problem...Only 173MHz is the bio-telemetry wavelength that we all use, the american version of 216MHz is I beleive now a DAB radio station the only other less used frequency is 433MHz as I beleive German and Finish Falconers use this frequency and a handfull of british falconers...So will a pre-amp and filter arrangement fitted between the Yagi and Receiver help in any way...I will gladly build any suggestions and give them a try as I do not wish to pay out £450+ for a receiver when I already have one to hand...So what options are available to me...</blockquote>

[QUOTE="hawk1943, post: 299702, member: 20784"] Hi Unit_399, Thanks for replying... The antenna is approximatly 6inches long and attached by a plectrum to the back tail feathers of the bird I am flying, which this season is a Harris Hawk... So depending upon whether the bird is on a kill (down at ground level) or perched in a tree depends upon the height of the antenna... this is one variable that cannot be controlled... The rig cannot be controlled all that much, as the transmitter is limited by weight and only weighs 3 grams anything heavier can restrict the birds flying ability... The units are brought in, at the pre-set frequency... The usual distance required is around 5 miles although the manufacture does state that 20 miles is possible... but this must be line of sight and depends upon the bird it is being fitted to a Harris Hawk for instance will not usually travel too far upto 5 miles no more, but a sparrow hawk etc can go much further and 20 miles is possible... The dedicated receivers can cope with the signal to noise ratio, hence I am convinced that a solution exists as how else can they overcome the same problem... Only 173MHz is the bio-telemetry wavelength that we all use, the american version of 216MHz is I beleive now a DAB radio station the only other less used frequency is 433MHz as I beleive German and Finish Falconers use this frequency and a handfull of british falconers... So will a pre-amp and filter arrangement fitted between the Yagi and Receiver help in any way... I will gladly build any suggestions and give them a try as I do not wish to pay out £450+ for a receiver when I already have one to hand... So what options are available to me... [/QUOTE]

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