EQUIPMENT CHECK-OUT AND ADJUSTMENTS

Headset Receive Limit

The receive audio sensitivity and the method of handling audio overload varies widely among headset manufacturers. To avoid dispatcher complaints about excessive receive background noise, use the follow- ing procedure to set the headset receive limit:

Inject a tone into the Rx port of an available LIC card and Select the channel.

Turn the radio headset jack volume control to its max- imum (loudest) setting.

If the headset amplifier has a volume control and/or volume switch, set them to maximum.

Locate the Headset Limit control (HS LIM) on the Selected Audio speaker amplifier board. Turn this control to its maximum setting. While listening to the tone, slowly turn this control down until you hear the output from the headset earpiece just begin to decrease. Set the control slightly above this point such that the headset is just into compression with its volume controls at maximum. The headset jack radio volume control and any controls on the headset itself can be used to adjust the volume to each operator’s preference.

TELCO Level Adjustments

TDV-OP409 is an electronic interface which pro- vides amplification and adjustments for the receive level. Refer to the VR-CM50 Console Service Man- ual, Volume 1, CRT- Technical Manual Section , for jumper configuration settings.

External Encoder

If the console is equipped with an external paging encoder (such as ZETRON), the input sensitivity is adjusted by the ENCDR control, R33. There is no sig- nal compression in the external encoder audio path. If the data furnished to E.F. JOHNSON at the time of order did not specify the use of an external encoder, the port on the tray will not be programmed to be active.

NOTE: The ENCDR control does not affect the output of the internal keypad encoder on the control tray. Paging tones are actually generated on the LIC card, not in the control tray.

Telephone Ringer

If the console is equipped with the Integrated Telephone Screen option, the internal telephone ringer volume can be set by the S MIX control, R86.

6.4ALIGN THE CRT TOUCHSCREEN WITH THE PC COMPUTER

If your system is equipped with a touchscreen option (TDV-OP492/xx), the touchscreen must be cal- ibrated for the specific monitor on which it is installed. Before calibrating the touchscreen, adjust the height, width and position of the CRT image.

1.Return to the Main Screen:

If you are at any other screen but the Main Screen, Press "MAIN" to return to the Main Screen.

2.Access the c:\> prompt:

Press CTRL + 5 using the "5" from the NUMERIC KEYPAD.

c:\orba> will display.

Type cd\ (Enter) c:\> will display.

3.Begin the Calibration Program: At the c:\> prompt:

Type "sfcal" (Enter)

Follow the instructions on the screen:

 

February 1996

6-3

Part No. 004-3039-274

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EFJohnson VR-CM50 manual Headset Receive Limit, Align the CRT Touchscreen with the PC Computer
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VR-CM50 specifications

The EFJohnson VR-CM50 is a state-of-the-art mobile communications solution designed for first responders and public safety agencies. This versatile device is engineered to enhance communication efficiency and reliability, ensuring that users can stay connected in critical situations.

The VR-CM50 features a rugged design, built to withstand the harsh environmental conditions often encountered by emergency personnel. It meets military specifications for durability, including shock, vibration, and water resistance. With a lightweight and compact form factor, the VR-CM50 is easy to install in various vehicles without compromising the available space or mobility.

One of the standout technologies in the VR-CM50 is its advanced digital trunking capability. The device operates on multiple frequency bands, allowing for seamless communication across various networks. This flexibility is crucial for interoperability among different agencies, especially during joint operations or mutual aid scenarios.

The VR-CM50 also offers enhanced audio quality, ensuring that users can clearly hear and be heard even in noisy environments. Its digital signal processing technology minimizes background noise and enhances voice clarity. This feature is vital for first responders who often communicate in high-pressure situations where every word counts.

Another key characteristic of the VR-CM50 is its integration with a wide range of communication systems. The device is compatible with various communication protocols, enabling connection with existing infrastructure. This adaptability allows agencies to leverage their current resources while benefiting from the latest technological advancements.

The VR-CM50 promotes user safety with built-in emergency features. It includes a dedicated emergency button that, when pressed, instantly alerts dispatchers and other personnel of the user's location and status. This feature is particularly beneficial for officers on patrol or in isolated areas, enhancing their safety during critical incidents.

Furthermore, the VR-CM50 supports GPS capabilities, providing real-time location tracking for fleet management and situational awareness. This technology not only improves operational efficiency but also enhances coordination during complex incidents.

In summary, the EFJohnson VR-CM50 is a robust and feature-rich mobile communication solution tailored for public safety professionals. Its rugged construction, advanced digital trunking, superior audio quality, and integration capabilities make it an essential tool for effective communication in the field. By fostering interoperability and user safety, the VR-CM50 stands as a reliable choice for agencies striving to enhance their emergency response capabilities.
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