Thanks for all the comments. Turns out that the one my neighbor has
(PetSafe, a bargain-priced Walmart item) operates on VLF (10.6 kHz), and
both transmitter and receiver have ASICs in them that code the signal to
avoid RFI problems. Sounds like a pretty good situation, and the maker
says they have had no RFI problems either in or out.
73, Pete Smith N4ZR
Contesting is ... Extreme Radio
The World Contest Station Database
is back up and running at
http://www.qsl.net/n4zr
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