User`s guide

AutoTune™ for VX-P820/P920 Rev. C
6
4.3. Radio Test Set
A radio test set is a service aid which provides a means of injecting signals into and
sampling audio output from a radio under test for purposes of performance verification.
It generally connects to the radio’s universal/accessory port, to a PC, and to other test
equipment, such as the R2670. For example, to determine the radio receiver’s
sensitivity to incoming signals, a SINAD test may be performed. A radio test set can be
used to route the radio’s audio output to a SINAD meter for measurement.
Currently, Vertex Standard does not market a radio test set for VX-P820/P920 radios.
However, a test set may be constructed using the schematic provided in the radio’s
Service Manual. This schematic is also included in Appendix A of this document.
Though not critical for AutoTune™ performance, a radio test set may be used to verify
certain receiver alignments supported within AutoTune™, such as RX Tune and SQL
Sensitivity. Because of the lack of a standardized test set, AutoTune™ currently does
not directly support a RX Tune or SQL Sensitivity test. If such verification is desired and
a radio test set is available, configure the R2600 and radio channels as described for
RX Tune and SQL Sensitivity in sections 5.2 and 5.3, respectively. Using the R2600,
sample the appropriate SINAD and squelch measurements and compare against Vertex
Standard VX-P820/P920 published tolerances for acceptance.