VDV Infinity II Line Amplifier Mine Site Technologies Pty Limited
Publication Date: 15 July 2005
Version: PCO346
Features of the VDV Infinity II—PCO346 The VDV Infinity II Line Amplifier. (PCB Model PCO346)
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The VDV Infinity II Line Amplifier includes a few modifications since the implementation of the VDV Infinity series Line Amplifier.
External Power indication.
Major differences being the removal of the in circuit Pilot Tone (Standard in Infinity Series) and the addition of Uplink / Downlink Pilot Tone selection (Infinity II).
External Pilot Tone indication. On board diagnostics built in standard.
The benefit of the latter being that a s ystem may be operated with multiple Pilot references without those references mixing at a point within the system.
Top cover of VDV Infinity II Line Amplifier. •
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Pilot Tone PCB’s may be installed to control either Up or Downlink gain. AGC May be controlled by either an Uplink or Downlink reference. Robust waterproof housing.
As with the VDV Infinity Line Amplifier, the VDV Infinity II Line Amplifier includes;
External indicators of Power & Pilot Tone.
Broad band of amplifier response.
Low power consumption (nominally 1.2W).
Forward / Reverse 22dB nominal gain.
Inbuilt diagnostic transmitter as standard.
Programmable diagnostic ID’s.
Limited number of variable tuning points.
AGC Reference Selection The VDV Infinity II Line Amplifier has the option of having its AGC controlled by a reference from either an Uplink or Downlink source. The selection of the AGC Reference source is made by selecting either ULP (Uplink) or DLP (Downlink) headers with a pin jumper.
AGC REFERENCE Uplink / Downlink selection header.
Failure to install a jumper in either of the header locations will result in the VDV Infinity Line Amplifier AGC operating without a Pilot Reference (or free gain). Care must be taken to ensure that there is a Pilot Source from the direction selected.
In this issue: VDV Infinity II
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If not, then the Line Amplifier AGC will subsequently operate without a Pilot Reference (or free gain).
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A Pilot Tone may be generated from the VDV Infinity II Line Amplifier by inserting a Pilot Tone PCB in the appropriate location (view Pilot Tone article).
Line Amplifier Overview AGC Reference Selection
Pilot Tone PCB Installation 2 VDV Diagnostics
Pilot source header pins.
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Pilot Tone PCB installation The VDV Infinity II Line Amplifier may have a Pilot Tone PCB installed in order to provide an AGC reference from w ithin a Leaky Feeder distribution. This Pilot Tone may be installed at any point within the system, however it should be installed with the appropriate system plan in mind. Generally, when the Uplink Pilot Tone configuration i s utilised, then the Line Amplifier should accordingly be the last amplifier in the line. This will then provide a reference for all previous Line Amplifiers in order to control their AGC. Alternatively, the Downlink Pilot Tone configuration should be utilised at the start of the line. It could possibly be the first amplifier in a “Branch” of the distribution, for example. A system could possibly, and perhaps ideally, have multi ple configurations of both Uplink & Downlink Pilot Tones operating concurrently.
Pilot Tone mount header & mount post.
Pilot source header pins.
The system could be configured with the MAIN line (eg Decline) of the distribution controlled by an Uplink Pilot Tone installed in the last amplifier in the Main Line. Subsequent branches (eg Levels) from this main line may be controlled by a Downlink Pilot Tone installed in the firs t amplifier of that particular branch (eg Level Access). PCB Mount hole aligned with ULP text on PCB.
When utilised, the PCB is to be installed upon two rows of five pin headers (as indicated). Care must be taken to ensure the PCB has been aligned correctly and all pins are connected. It is not difficult to misalign the PCB and subsequently for the unit not to operate correctly. To install a Pilot Tone PCB in order to provide an Uplink reference orientate the mount hole with ULP (text on the PCB) aligned with the amplifier mount post.
Pilot Tone PCB Installed in Uplink orientation.
To install a Pilot Tone PCB in order to provide an Downlink reference orientate the mount hole with DLP (text on the PCB) aligned with the amplifier mount post.
When installed the Pilot LED indication of the front of the VDV Infinity II housing will light indicating that the Line Amplifier has a Pilot Tone PCB installed. If the Pilot Tone LED indication does not light, then there is a problem which needs to be addressed. To assist in fault finding firstly check to see if the Power LED indicator is operating. Also check to verify that the PCB has been installed correctly.
PCB Mount hole aligned with DLP text on PCB.
Pilot Tone PCB Installed in Downlink orientation.
VDV Infinity II Diagnostics The VDV Infinity Line Amplifier II has inbuilt diagnostics transmitter as a s tandard. To implement a diagnostic function, it is necessary to purchase a VDV Diagnostic Receiver to process the reports from the VDV Infinity II Line Amplifiers & the VDV Diagnostic Server software.
Diagnostic Programming Header pins.
The VDV Infinity II Line Amplifiers can subsequently then be programmed with information (via the diagnostic programming header) such as, Amplifier ID number, reporting frequency, frequency of operation etc. Implementation of the diagnostic system will then become an integral part of the VDV Leaky Feeder Radio System fault finding & monitorin g regime. Diagnstic Programming port.
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