VEMCO – VR100 Manual 28 May 2018 78
7.4 Transponding Related Questions
7.4.1 I can’t communicate with the receiver. What should I do?
First, check your location. You may be farther from the receiver’s deployed location than you realized;
moving closer would help communications. If that doesn’t help, try increasing the VR100-200’s transmit
power level.
If you’re very close to the deployed location and the water is shallow, try reducing the VR100-200’s transmit
power level slightly. It’s possible the signal is acoustically over-saturating the area, or causing echoes, and
therefore interfering with communication.
If you can tell the remote receiver is hearing the command and transmitting a response but the VR100 isn’t
decoding it you can try increasing the VR100 gain.
7.4.2 When I try to release the VR2AR, the VR100-200 says “Unarmed.”
The VR100-200 is letting you know that the VR2AR has not been “armed” or prepared to release. This
“arming” is a protective measure against accidently releasing a VR2AR. Select Acoustic Release (#3) and
then Arm (#2) to arm the receiver and prepare it for release (see section 4.4.5).
7.4.3 The VR100-200 says “Failed to Release” – now what?
If the VR100-200 reports “Failed to Release” when you attempted to release a VR2AR from its mooring, then
repeat the release sequence (section 4.4.5). If you still don’t have success, contact VEMCO.
7.4.4 Why does the VR100 say “No response from VR2Tx/AR”?
This indicates that the signals from the VR2Tx/VR2AR are not reaching the transponding hydrophone of the
VR100-200. It is possible for the receiver to hear the VR100 but the VR100 may not hear the receiver. To
solve this problem, first check your position compared to the receiver and get as close as you can. Also check
the receiver’s transmit power level (see section 6.2.1) and increase it if possible. If the power level is already
high, and you’re working in shallow water, trying lowering the power to decrease any echo effects. You
could also try increasing the VR100 gain (see section 4.2.3), especially if you can hear faint pings being
transmitted but they are not being decoded.
7.4.5 Why did a message appear telling me to enable channel 8?
Channel 8 is used for acoustic communication with a receiver. If channel 8 is not configured for
transponding, then when “Transpond” is selected (see section 4.4.1) a message will appear on the VR100
display warning that channel 8 needs to be configured and enabled. When this screen is visible, selecting
“Next” will allow you to select “Transponding” as the type of configuration desired. Select “Next” again and
then “Accept” to finish the configuration. Enable the channel as described in section 2.3.5.
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