![background image](http://html1.mh-extra.com/html/federal-signal-corporation/ultravoice-uv/ultravoice-uv_installation-operation-and-service-manual_3830688039.webp)
39
Installation
Installation, Operation, and Service Manual
5. Locate the connector/brass tube assembly in the gamma match parts bag and
insert the assembly first through the connector bracket, and then thread the
connector into the bracket. Tighten the connector fully. Use a drop of Locktite
or other thread lock in the threads to eliminate the possibility of the connector
loosening.
6. Slide the gamma link onto the driven element and assemble the gamma match as
shown in figure 1 or 2 (under the antenna instructions provided by the antenna
manufacturer). Set dimensions “A” and “B” to those shown in table 1. Setting
the match to the dimensions shown for your antenna is a good starting point that
allows you to quickly line tune later. Complete the assembly by attaching the end
cap onto the end of the gamma tube. The antenna is now ready for final tuning.
Final VSWR Tuning
To final tune the antenna, do the following:
1. Before final installation of the antenna, temporarily set it up in a clear area at least
six feet above the ground.
NOTE A
: Do not touch the antenna while the radio is transmitting.
NOTE B
: Ensure antenna is not touching any conductive material and is pointed
away from all objects and people. Pointing antenna at objects in close proximity
may act as a reflector and create inaccurate readings.
2. Apply RF power to the antenna at the transmit frequency to be used at that
antenna, and check for the low VSWR while performing each of the following
steps.
A. Loosen the set screw with the Allen key provided and make a slight
adjustment to the aluminum gamma tube for the lowest VSWR (Reflected
power).
B. Adjust the gamma link along the driven element for the lowest VSWR.
C. Repeat the above steps until the lowest VSWR is achieved. Reflected power
must be less than 10% of the forward power.
D. Return to the dimensions shown in the antenna instructions, if there is any
trouble achieving a good match. If the element dimensions are incorrect for
the frequency being used, low VSWR may be unattainable. If the VSWR
specification is still unattainable, replace the cable (A simple ohm meter
check of the cable does not guarantee that the antenna cable is good, due to
the DMM not having the ability to check the cable at high frequencies). If
that does not take care of the problem, replace the antenna.
Содержание ultravoice UV
Страница 42: ...42 Installation UltraVoice UV Figure 15 Omni Antenna Installation Example...
Страница 43: ...43 Installation Installation Operation and Service Manual Figure 16 Antenna Grounding...
Страница 71: ...71 Appendix C Drawings Figure 25 UV Controller Two way Radio Wiring Diagram...
Страница 72: ...72 Figure 26 UVTD IP Broadband Wiring Diagram...