Marshall Amplification Field 4000, Owner'S Manual

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Field Marshall Tracking Receiver
Frequently Asked Questions
Why does m y receiver pick up all m y transm itters at
the same time? They’re on different channels.
Extremely strong signals will get through even the most power-
ful filters in a receiver. If you have transmitters on adjacent
channels transmitting right around you, you might hear a pop-
ping or thumping sound from them. This can be a distraction
when you’re trying to pick up a very weak signal from a lost ani-
mal.
The solution is to turn off the transmitters around you while you
track a lost animal. If you’re just tuning up, switching the Range
Switch to Near will help to remove the unwanted signals.
I lost the signal and tried to tune it in. I couldn’t get it
again.
If you lose the signal, don’t panic and tune all over the dial. It’s
essential not to lose the correct tuning. The signal may have
drifted, but not much. So if you really think the signal could
have drifted, take note of the setting and then just turn the
Tuning Knob very slightly and search for the signal by scanning
the horizon 360º. If you don’t find it, you’re out of range. Turn
the Tuning Knob back where it was when you last heard the
signal and go to higher location and try again.
I could only pick up a transm itter a half a m ile aw ay.
This usually happens because the transmitter is putting out a
weak signal. The range of transmitters varies tremendously,
depending on where they are. A transmitter on the ground may
go less than half a mile. If the antenna is pointing directly at
you, you may hear almost nothing.
If the transmitter is putting out a good signal, the problem is
almost always improper tuning of the receiver. It’s possible to
tune to a tone that sounds like your transmitter, but is actually
at the wrong frequency (or even on the wrong channel!) It will
sound fine when you’re right next to the transmitter, but when
you get in the field it becomes weak (This can happen on any
receiver.)