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----- Original Message -----
Sent: Monday, April 04, 2005 2:01 PM
Subject: TX cores / current sensors
To the members on the LF group
,
As I am trying to draw the circuit
diagram of a recently bought Ropex "The First " transmitter I found the
following interesting detail . The output current of the TX is passing 3
paralelled 1 Ohm resistors to the antenna-relay , the voltage developped
over this resistance is coupled to the input of a optocoupler IC which is
connected to the protection circuit . As optocouplers are normally well
insulated at least a few Kv this idea must be suitable for lots of applications
.
As a new member of the group I wish to
join you and have as much pleasure from it as my radiofriend Dick PA0SE who
fixed my attention on your group .
73,William PA0WFO ( hope to work you in
the near future )
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