NHRC-10 User Guide
Copyright
1999, 2000, 2001, NHRC LLC. All Rights Reserved.
Page 15
VR5 until sufficient drive is obtained. Don’t worry about phone audio into the
transmitter at this time, it will be set later. Hang up patch wen you are satisfied with
this adjustment.
5. This completes the initial receiver input adjustments. The next steps will adjust all
audio levels into the transmitter mix bus. The goal is to get the main receiver,
remote base receiver, and DVR output levels on the mix bus equal, and the courtesy
tone/DTMF generator set to a reasonable level. An oscilloscope connected to the
monitor connector (J10) is a useful aid in this step.
6. Use VR7 to set the received audio repeat level.
7. Use VR6 to set the courtesy tone to a reasonable level.
8. Unlock the controller and force it to speak with the *800 command. Set the DVR
playback level with VR10. Lock the controller.
9. Initiate a patch and set the incoming phone audio to a reasonable level with VR2.
Send some DTMF tones though the phone from the remote end and verify that LED
D11 indicates reliable DTMF decoding from the phone line. The controller will now
respond to commands from the phone line.
10. Set the DVR input level. This is best set by recording a test message and allowing it
to play back. Adjust the input level so that the test message is played back at the
same level as it originally passed thorough the repeater. It also should be the same
level as the factory default words recorded into the DVR. Overdriving the DVR will
result in compression of recorded audio, complete with “noise pumping” effects, so
it is important that the level is not set too high.
11.
Hint:
Set up your signal generator with the test tone. Turn generator output off.
Use a handheld radio to send the test message command (default 11) and then un-
key. Turn on the generator. Note the deviation of the
repeater’s
transmitted signal.
Shut off the generator. The DVR will now play back the recorded test tone. Note
the deviation. Repeat this test and adjust the DVR input until the record and
playback deviation is the same.
Be careful
to remember to subtract out your CTCSS
deviation to get a true DVR deviation measurement.
12. Turn on the remote base. Send the test tone on the remote base Rx freq. Set the
incoming level to be similar to other levels on the audio bus by adjusting
potentiometer VR1.
13. Transmit a test tone into the repeater and set the remote base transmit deviation with
potentiometer VR3.
14. Adjust the main transmitter deviation with VR8.
15. The control receiver audio enters the controller at jack J8, unless nothing is plugged
into J8, in which case, the controller will use the remote base receiver audio as the
control receiver. In either case, potentiometer VR4 adjusts the control receiver audio