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  #21  
Old 09-04-2008, 10:25 PM
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Golden Hayabusa Golden Hayabusa is offline
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Default Re: Making your own Telemetry

How's the reception distances on this transmitters?
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  #22  
Old 09-04-2008, 10:52 PM
Kilham Kilham is offline
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Default Re: Making your own Telemetry

Quote:
Originally Posted by Altai View Post
Has anyone read the book on telemetry by Robert Kenwood? It has got everything in it that you would need to build your own: plans, diagrams, supliers lists, and instructions.
I posted info. about it before but I think it was removed!!
Make sure it's the original 1987 version, the reprint is more for using commercial equipment than homebrew.

Quote:
Originally Posted by Bellmaker View Post
That may of been the book i read, you can get it from the library, if you order it.

When i made my transmitter's, i did not use a PCB, but soldered the component together using the crystal's case, than encased them in "ARALDITE" glue.
Here are some links that may help :

http://jeb.biologists.org/cgi/conten...io;208/21/4063
http://www.nbb.cornell.edu/neurobio/...ECTS/TRANSMIT/
PDF with info in:
http://digitalcommons.unl.edu/cgi/vi...&context=vpc14

I think i got my crystal's from here: http://www.euroquartz.co.uk/

The next time i am making a transmitter, i will take stage by stage photos to show how its done and post them here.
Last time I enquired (last summer) Euroquartz would only supply batches of 25+ of each frequency, I'm going to have another go at finding a case and will post more soon.

Tony.
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  #23  
Old 09-04-2008, 11:26 PM
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Rabadswompe Rabadswompe is offline
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Default Re: Making your own Telemetry

Quote:
Originally Posted by Kilham View Post
Make sure it's the original 1987 version, the reprint is more for using commercial equipment than homebrew.


Last time I enquired (last summer) Euroquartz would only supply batches of 25+ of each frequency, I'm going to have another go at finding a case and will post more soon.

Tony.
You're looking for a case... aluminum tube of what diameter??
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  #24  
Old 10-04-2008, 02:26 AM
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Default Re: Making your own Telemetry

Craig, that is a tiny little transmitter before you encase it in the glue. What is the range on something like that?

Yann, I will draw up some illustrations and post them here. The Yagi is for 216. It works really good because I used a program made for testing design. Anyway, the yagi to radio requires a small adaptor. But that is found at most Radio Shacks. The scanners can be found on Ebay cheaper than you can buy them elsewhere, and everything else comes from Home Depot. I will draw it out and give you the exact lengths of the elements and how to do the hair pin match. It is easier and works better than a gamma match. You will not even have to know what that all means.

Jack
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  #25  
Old 10-04-2008, 10:20 AM
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Default Re: Making your own Telemetry

Jack... you and Craig rank amongst the "MacGyvers" of falconry!!!!!!
great stuff!


Btw...Macgyver had a falconry related episode whay back when... hatched eagle eggs!
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  #26  
Old 10-04-2008, 05:24 PM
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Default Re: Making your own Telemetry

Quote:
Originally Posted by Kilham View Post
The trick is finding crystals for the UK telemetry frequencies
Another bit I had problems with is finding the aluminium tubes to build them into (this takes the place of part of the goundplane wire shown in purple above and has to be metal not plastic - the bird itself forms the rest).
www.golledge.co.uk for crystals and some off the coaxail cable connectors can be adapted
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  #27  
Old 10-04-2008, 07:29 PM
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Golden Hayabusa Golden Hayabusa is offline
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Default Re: Making your own Telemetry

How's the transmission "distances" or "Ranges" on this transmitters ? Anyone?


Jack?
you wrote that "I made my own reciever. I used 2 different makes of scanner radio."

Could you tell us how you made a receiver using two different scanner radio?
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  #28  
Old 11-04-2008, 12:32 AM
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Default Re: Making your own Telemetry

Right, the range is as good as any single stage transmitter you can buy, that is because transmitters have very little power any way, so to get round this, most of the work is done with the receiver, which are very sensitive.
With a single stage the only way to get more power (range), is to up the voltage or/and lengthen the antenna.
The other thing to do is to use multi-stages, which add some more components.
So the range will be as good as the best single stage transmitter.

As i used it with a not very sensitive home made receiver, i got a mile in enclosed country, this was the same as a bought one.
But it would give 2 months running if left on.

The transmitter works by, turning its self on and off with a delay in between, this is picked by the receiver and converted to a audible sound, by the BFO (Beat frequency oscillator) in the receiver.
Some BFO info:
http://en.wikipedia.org/wiki/Beat_frequency_oscillator
Hope this helps.
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  #29  
Old 11-04-2008, 01:23 AM
Kilham Kilham is offline
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Default Re: Making your own Telemetry

Quote:
Originally Posted by Rabadswompe View Post
you're looking for a case... aluminum tube of what diameter??
about 10mmIDx25mm and 12mmIDx25mm (Length isn't critical dia. is for the batteries).

I have some 57,740 and 57.760 MHz crystals, .4mm copper laminate for PCBs and components to build about 10 single and double stage transmitters, even a couple of SM PIC processors to experiment with fancier features such as power saving modes and pulse patterns to identify individual transmitters. Brass and nylon fittings for the antenna, steel wire etc.
The only thing I couldn't get was something to build it into. Turning a case with a threaded lid - how easy would that be?.

Tony.
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  #30  
Old 11-04-2008, 01:45 AM
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Default Re: Making your own Telemetry

Quote:
Originally Posted by Kilham View Post
The only thing I couldn't get was something to build it into. Turning a case with a threaded lid - how easy would that be?.Tony.
If you have the right equipment (eg: metal lathe) not that hard, i would make some and do some pic, if anyone got any good designs, post them and i will see how they workout to make.
The antenna's are available from fishing shops.

As a side note: when i finished making bells for MJ, he asked me if i would make transmitter caser's, so these maybe hard to get even for equipment suppler like MJ.
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