Elettronika S r l TXUP2000 2 kW Analog TV Broadcast transmitter User Manual APT088A AUTV 2000LD Rev0 Date170203 p65
Elettronika S.r.l. 2 kW Analog TV Broadcast transmitter APT088A AUTV 2000LD Rev0 Date170203 p65
Contents
- 1. User Manual Part 1
- 2. User Manual Part 2
User Manual Part 2












































![103TESTING AND CALIBRATION INSTRUCTIONSThe output filter Mod. CL4NL22 is made up by a 4-resonator band-pass section and two “notch”resonators. It can be adjusted on all the channels of the TV UHF band (470 ÷ 860MHz) and on all theworld standards (intercarrier 4.5 - 6.5MHz). The pass-band section is made up by the group of the fourresonators, while the two separate resonator are the notches. The filter is symmetrical, thus there is nodifference between the upper and lower notch.The band width is adjusted by changing the insertion of the lower Post Screws which are placedbetween the band-pass resonators; inserting the post screws it is increased. In order to perform thisadjustment, loose the bolt of each post screws by means of a wrench n° 19. The first and third postscrews have to be adjusted for the same protrusion from the body of the filter, while the middle oneshould usually be adjusted in a slightly different manner in order to obtain an equiripple response.The input and output coupling, which can be reached by removing the protection cups, can be adjustedby means of the two lower Coupling Stubs next to the connectors. The adjustment is made by means of aflat wrench n° 18, taking into consideration that when the maximum coupling is obtained when thecommand cuts are parallel to the longer side of the filter, the minimum when they are orthogonal to it.The response symmetry is determined by the protrusion of the above mantioned stubs; these are set byloosening the relevant lower clamps by means of a tube wrench n° 16. The clamps, once tightened, alsodetermine the friction of the rotatio of the couplings.The suggested calibration sequence os the following:set the measuring instrument on- C.G. = (P.V. + P.A.) / 2- SPAN = INTERCARRIER * 5 (Es. 27,5MHz std. B/G)- RESPONSE = 5dB/div.- ADAPTATION = 10dB/div.Center Frequency[MHz=] Coupling Stub[mm=] Post Screw[mm=]474 2 6570 16 15666 29 17762 38 17858 40 17](https://usermanual.wiki/Elettronika-S-r-l/TXUP2000.User-Manual-Part-2/User-Guide-689180-Page-45.png)

