Modification of the receiver is not an option for several
reasons.........

-

The Earth and solar system make alot of noise on these frequencies. I
suspect the receiver is designed to be somewhat insensitive in order
to avoid problems with noises generated by Mother Nature.

-

The schamatic of the dog collar is not available, the manufacturer
chose to make type acceptance documents 'private'. There is a record
of the receiver, but all details are unavailable to the public.

-

The receiver assembly is in an enclosure that can't be opened,
probably to insure operation if the collar gets dunked in water (some
dogs enjoy swimming). It also appears to be potted, the black epoxy is
visible in the port provided for adjusting the correction level).


-

A



That being said, it might still be easier to increase the sensitivity of the
receiver. What type of antenna is on the dogs collar? Also - what is the
brand and model of this unit? It might make tracking down the soultion a bit
easier.