Campbell Scientific VSP3 Vosponder Voice Radio Interface - Manual (Page 47)

C-1
Appendix C. Audio Level Controls
Four audio level controls are provided on the Vosponder. The information
provided here is only for a reference should a technical support representative
ask you to make adjustments to the factory settings.
Opening the case and adjusting these settings without first consulting with
a technical support representative will VOID the warranty. Under normal
circumstances no adjustment from the factory settings will ever be
required.
However, some special applications may require small variations in the
settings. Contact a technical support representative at (435) 755-0300 or
submit a request via e-mail at [email protected] prior to
making any modifications to the default settings.
FIGURE C-1. Audio Level Controls
The audio level controls are designated as follows, left to right, as in
Figure C-1:
1. R26 – Transmit Gain – Sets the overall gain level for audio originating
within the Vosponder.
2. R23 – Tone Level – Not implemented in this version of the Vosponder
firmware.
3. R24 – Voice Level – Sets the voice module level into the transmit
amplifier.
4. R25 – Receive Level – Controls the level presented to the tone decoder
system.
R26 Transmit Gain – should be set to accommodate the level required by
the two-way radio microphone or audio input. This is best done
using a calibrated communications service monitor.
R24 Voice Level – should not require field adjustment. It may, however,
be set using a quality oscilloscope. To make adjustments, cause the
voice module to produce a pure tone then, while observing the output