Front & rear panels redrawn to scale with handle S/N ≥ 9500000 omitted. 27/11/1996 CVA-3120 sub-document included. S/N ≥ 9500000 12/01/2001 IRT Border page added for PDF format, S/N ≥ 9500000 00COMMON.doc file contents added 05/07/2002 Link paths reset S/N ≥ 9500000 11/09/2002 Drawing list updated and all relevant test S/N ≥...
VA-700 USER MANUAL Table of Contents: Section Page Revision History Operational Safety General Description Technical Specifications Configuration Location of links & user settings Installation Front and rear layouts Sub-modules (NOTE: Obsolete – No Longer Available. Information for existing modules only) DL-700 Delay &...
VA-700 OPERATIONAL SAFETY WARNING Operation of electronic equipment involves the use of voltages and currents that may be dangerous to human life. Note that under certain conditions dangerous potentials may exist in some circuits when power controls are in the OFF position.
Cable equalisation is provided for up to 300 metres of 75 Ω high quality cable with adjustment via the front panel. The VA-700 may also be used as a pulse distribution amplifier. (Only 6 outputs may be used for 4 Vp-p) The VA-700 is manufactured on an extended Eurocard board for mounting in IRT Eurocard frames.
Power consumption Other: Temperature 0 - 50°C ambient. Mechanical Suitable for mounting in IRT 19" rack chassis with input, output and power connections on the rear panel. Finish Front panel Grey background, black lettering & red IRT logo. Rear assembly Detachable silk-screened PCB with direct mount connectors to Eurocard and external signals.
Moving the link to position 8b will allow for cable lengths of 0 - 75 m to be compensated. Clamping option: Decide if the clamp feature of the VA-700 is required. In general the clamp feature is useful if the video signal is always composite.
VA-700 RGB video distribution: When operating three VDA's in a group for RGB signal distribution only the green signal will carry sync information. The video signal from the input amplifier of the GREEN signal VDA can be sourced to the other VDA's by rewiring links on the 'plug-in area' of the VDA's.
VA-700 INSTALLATION Pre-installation: Handling: This equipment may contain or be connected to static sensitive devices and proper static free handling precautions should be observed. Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures should be followed when inserting or removing cards from these bags.
A delay trim adjustment of ±3 ns is provided which may be included in the signal path if required. When installed in the IRT Eurocard VDA type VA-700 this trim control is aligned with a hole in the front panel to allow fine adjustment of the delay when in operating configuration.
Power consumption 50 mA (additional to VA-700). Other: Temperature range 0 - 50° C ambient Mechanical Suitable for mounting in IRT VA-700 VDA. Dimensions 135 x 42 mm PCB. Optional accessories Instruction manual Filter or delay modules. Due to our policy of continuing development, these specifications are subject to change without notice.
VA-700: On the VA-700 in the plug-in area the following links changes must be made. Remove the link from LK 2 - LK 3, add links from LK 3- LK 4 and leave the existing link between LK 6 - LK 7.
VDA. An LED is fitted to the sub-module, which extends through the front panel of the VA-700 and a relay closure alarm output is available on the VA-700 rear connection assembly at the three pin remote connector.
Other: Temperature range 0 - 50° C ambient. Mechanical Suitable for mounting in IRT VA-700 VDA. Dimensions 135 x 42 mm PCB. Due to our policy of continuing development, these specifications are subject to change without notice. I.R.T. Communications Pty Ltd | www.irtcommunications.com...
AVD-3120: If a second equaliser sub-module is fitted to the VA-700 as is the case with the VA-700T this may first be unplugged from its socket, taking note of the correct alignment so as to facilitate replacement after the AVD-3120 is fitted.
0 to + 12 Vdc 1 KOhm The CVA-3120 is a video gain sub-module designed to be fitted to the IRT VA-700 general purpose video distribution amplifier to provide remote access to the gain of the VDA. The control signal is completely separate to the video path and so does not cause noise in the video path. The control signal is damped to prevent noise on the external control causing short term gain variations.
TECHNICAL SPECIFICATIONS Video: Video system Composite PAL or NTSC. Performance: Performance figures given are for overall performance when the sub-module is mounted in a VA-700 VDA. ± 3 dB. Gain range Differential phase < 0.1° (at 3.5 to 4.3 MHz).
The 6 dB amplifier U2 may be adjusted to greater or lesser gain settings if required although this should rarely be necessary. The combined gain and EQ circuits of the VA-700 and the CVA-3120 should be sufficient to compensate for any losses in normal circuits.
CVA-3120 easier. Carefully position the sub board over the VA-700. Ensure that all pins of PL 2 & PL 3 of the VA-700 slide neatly into the corresponding socket positions of SK 2 & SK 3 of the CVA-3120.
The VA-700T VDA comprises a VA-700 fitted with the EQ-1227 sub-board together with a switch to select between this and the inbuilt equalisation of the VA-700 for Belden type YR23769 cable. In addition an identification plate is fitted into the handle of the VA-700 to identify the two switch positions.
The correct orientation for the EQ-1227 is with the component side facing the EQ range selection links 8a / 8b on the VA-700. When mounting the EQ-1227 sub board care should be taken to ensure that the pins of PL 1 on the VA-700 are correctly mating with the socket on the EQ-1227 before pressing the EQ-1227 firmly down.
For situations when “No Fault Found” for repairs, a minimum charge of 1 hour’s labour, at IRT’s current labour charge rate, will apply, whether the equipment is within the warranty period or not.
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