Daniels Electronics Ltd. OST-3H035 Instruction Manual
Also see for MT-3: Instruction manualInstruction manualInstruction manual
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DE DANIELSELECTRONICS3-2 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHzThe corresponding internal synthesizer jumper settings are:Digital Board• Jumper JU2 not installed 9.6/10 MHz reference frequency, 9.6 MHz selected• Jumper JU1 installed AM Multichannel mode selectedAnalog Board• Jumper JU1: 'B' position Internal/External reference. Internal selected• Jumper JU2 not installed Internal/External reference. Internal selected3.5 OS(R/T)-3(A/H) Synthesizer Alignment3.5.1 GeneralUnder normal circumstances, synthesizer alignment is accomplished without removing thesynthesizer from the MT-3 Receiver IF/Audio Board or the MT-3 Transmitter Main Board.Alignment simply involves setting the internal TCXO reference frequency (if one is installed andthe internal reference option enabled). This step is described in "Reference Frequency Alignment"of section 3.5.5.5. A change in synthesizer operating frequency greater than the maximum tuningrange for a particular model (Refer to Specifications section 1.3) from an initial factory settingrequires a slightly more involved alignment procedure as described in sections 3.5.2 to 3.5.5. Toconvert a synthesizer with an internal reference source to a synthesizer requiring an externalreference signal or vice-versa is done through the appropriate selection of jumper JU1 A or B, andJU2 (Refer to section 3.5.6).3.5.2 Synthesizer Test PointsAnalog Board Component Layout (Top)Common to all synthesizer family members.TP1 +8.0 ± 0.3 Vdc. U6 positive regulator output.TP2 +5.0 ± 0.1 Vdc. U7 positive regulator output.TP3 +5.0 ± 0.1 Vdc. U8 positive regulator output (always on).TP4 PLL error voltage. Ranges from +1.0 to +7.0 Vdc depending on frequency.Nominally adjusted (C24) to +4.5 Vdc for tuned center channel. UHF/VHFversions employing integrated VCO modules (OSR-3H440, OST-3H440, OSR-3A149, OST-3A128) require no adjustment.Digital Board Component Layout (Bottom)TP1 +5.0 ± 0.1 Vdc. U2 positive regulator output (controlled via pin P2-4).TP2 Microcontroller E clock. 2 MHz logic level square wave. |
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