UBS Axcera LU100AL 100-Watt UHF Translator User Manual

UBS-Axcera 100-Watt UHF Translator 366892

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Chapter 4

10W-100W UHF Translator Chapter 4, Circuit Descriptions Pioneer, UHF Translator, Rev. 0 4-1 Chapter 4 Circuit Descriptions 4.1 (A1) UHF/VHF Receiver Tray (1265-1100) The UHF/VHF Receiver Tray w/(Optional) Frequency Correction selects the desired UHF or VHF On Channel Input Signal and converts it to a Combined IF Signal of 45.75 MHz Visual + 41.25 MHz Aural. The Tray also has provisions for a Frequency Correction Option that consists of a VCXO Channel Oscillator Assembly with a PLL Circuit which maintains an exact IF Output Frequency, over the capture range of the PLL circuit, even if the Input UHF or VHF Frequency may vary. RF Signal Path 4.1.1 (A7) 50Ω Filter, DC Multiplexed, UHF (1035-1204), VHF L.B. (1035-1902) or VHF H.B. (2065-1024) or 75Ω, UHF (1035-1207), VHF L.B. (1035-1903) or VHF H.B. (2065-1023) The RF Input to the Tray, (-61 dBm to -16 dBm in Level), is fed through J1 for 50Ω to (A7) the input 50Ω Filter, DC Multiplexed (1035-1204 UHF, 1035-1902 VHF LB or 2065-1024 VHF HB) or through J5 for 75Ω to (A7) the 75Ω input Filter, DC Multiplexed (1035-1207 UHF, 1035-1903 VHF LB or 2065-1023 VHF HB), which is of a double tuned design that is adjusted to the desired Input UHF or VHF Channel Frequency. Note: If the input signal is greater than -25dBm, an attenuator should be used to limit the level to -25dBm. +12 VDC, for use by an (Optional) external Preamplifier Assembly, connects to the filter through F1 a 1 Amp Fuse. This +12 VDC is DC Multiplexed onto the input signal cable from the Preamplifier. DS1 a Red LED located on TB1 in the Tray will be lit if the +12 VDC is present on the input cable. If a Preamplifier is not used, F1 should be removed and DS1 should not be lit. 4.1.2 (A8) Dual Stage Amplifier Assembly (1227-1503) The signal is next amplified +12 dB to approximately the -49 to -4 dBm level by a low noise amplifier located on (A8-A1) the Dual Stage Amplifier Board (1227-1501) that is contained in (A8) the Dual Stage Amplifier Assembly (1227-1503). The board has approximately +13 dB or +26 dB of gain, depending on whether Jumper W1 on J5 is in place. The amplified output connects out of the board at J2. 4.1.3 (A9) Channel Filter, UHF (1007-1101), VHF L.B. (1034-1202) or VHF H.B. (2065-1000) The signal is then filtered in (A9) a Channel Filter (1007-1101 UHF, 1034-1202 VHF LB or 2065-1000 VHF HB) and then applied back to (A8-A1) the Dual Stage Board at J3. More amplification of the signal takes place on the Dual Stage Board, if needed. Jumper W1 on J7 should be removed if the Receiver Input level is greater than -40dBm. 4.1.4 (A10) Downconverter Amplifier Assembly, 45.75 MHz. (1227-1505) The output is connected to (A10) the Downconverter Amplifier Assembly (1227-1505) that contains (A10-A1) the Downconverter Amplifier Board (1227-1502). The RF, at the -47 dBm to -2 dBm Level, connects to the "R" Input Jack of the Mixer Z1 located on the Downconverter Amplifier Board. Local Oscillator Signal Path The Local Oscillator Signal is derived from a cut to channel crystal mounted in an oven that is factory set at 45° C. The Oscillator operates at 1/8 for UHF, 1/4 for
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Document ID366897
Application IDR8xFNVYwOXdEjde33oBx3Q==
Document DescriptionChapter 4
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatMicrosoft Word - pdf
Filesize23.57kB (294608 bits)
Date Submitted2003-10-21 00:00:00
Date Available2003-12-01 00:00:00
Creation Date2003-10-21 14:13:53
Producing SoftwareAcrobat Distiller 5.0.5 (Windows)
Document Lastmod2003-10-21 14:13:53
Document TitleMicrosoft Word - 366897.DOC
Document CreatorPScript5.dll Version 5.2
Document Author: fcc
FCC ID Filing: OUSLU100AL

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