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Low Power RF & Wireless Connectivity
134.2kHz animal tag collision avoidance
Could I ask for someone to help conduct a simple experiment for me ...
it relates strangely to a strategy for collision avoidance of LF 134.2kHz animal-tags.
I am away from the workshop for two weeks and am unable to do a hands-on experiment where I am at the moment...and I am "straining curious" to have an answer.
My question has two parts
1. if the tag (glass or button) is bathed in a steady-state 134.2khz "charge-field" then it is withdrawn away along say the eigen axis of a simple untuned solenoid connected to a signal generator then at some distance does the tag activate to uplink a valid telegram?
2. if the tag is held stationary in a "substantial steady state charge-field" and now the frequency of the charge field is shifted (manually?) up to say 144.2khz, does the tag "trip" to uplink a valid telegram?
For this experiment, it is unnecessary to resonant-tune the simple transmitter coil and impedence matching is trivial.To monitor tag activity a simple surfacemount inductor or sniffer-coil could be glued alongside the tag and watched on a oscilloscope for presence of a uplink-reply.
To add more realism, perhaps if you have a spare 007+coil+mb6 setup somewhere handy, if you disable the 007 transmitter and let it only listen and perhaps decode the tag under test it would further help me.
There are issues that may yet arise such as the hetrodyning of the vestigage of the diminishing charge field leaking into the receiver while the tag is "replying?" but that is a minor matter at the moment.
Should you be interested I will share with you what I am trying to do here, though some will already see where this is going.
If you have some spare time and are kind enough to help I will be very grateful
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