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Thread: Wireless communication...
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face BY : Jim P email (remove spam text)



Oh - digiscope ...

Do you have any small signal diodes like types 1N914
or 1N4148 diodes on hand?

If these are 'AFSK'  (AM or amplitude or Pulse modulation) a quickie
"RF detector" can be rigged and the data can be 'demodulated' and
seen with a low freq scope.

A DC voltage will also be produced - verifying the prescence of RF.

ckt:

RF from xmtr to a  50 Ohm  Resistor (load for RF)  to ground ---
--- Anode_diode_Cathode -----  1 K Resistor to gnd --- scope Input


Might also place a 470 pF cap to ground across the 1K R.

Schematically (if this comes through):

RF In---------o ------|< -----o-------o- to scope
                      |                       |           |
                  R 50                 R 1K     470 pF
                      |                       |           |
                     _                      _          _


Hope this helps.

Jim P.





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