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RF Transmitter ATTENBDATTENBD Tx Controller +10 V -10 V J 2x4 Synth IN Sfrq+20 2.3 V 80 MHz From Ref Gen J 2x3 Tx OUT A&P mod 1.3 – 2V J 2x5.

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Presentation on theme: "RF Transmitter ATTENBDATTENBD Tx Controller +10 V -10 V J 2x4 Synth IN Sfrq+20 2.3 V 80 MHz From Ref Gen J 2x3 Tx OUT A&P mod 1.3 – 2V J 2x5."— Presentation transcript:

1 RF Transmitter ATTENBDATTENBD Tx Controller +10 V -10 V J 2x4 Synth IN Sfrq V 80 MHz From Ref Gen J 2x3 Tx OUT A&P mod 1.3 – 2V J 2x5 LO Sfrq+20 MHz 2.5 V To LO selector J 297 J 298 J 299 J290 To LB AMP 1 To LB AMP Tx : full pwr +10V To HB AMP V from CDU E-net From Dell Switch 100BaseT RFIF Serial TO synthesizer Amp blankin/cw/readback TO AMP TR gate, phase 90/180, Tx, & 5V TO Gate Router Vrtx FPGA 16mb Flash 405 PPC 3 Type lines 64-SDRAM P2 Backplane:Jumpers for channel # Reset Diag Port CH1: HB CH2: LB J1 J2 J3 J4 From RFIFs J4 79 dB atten control Binary Fine Phase Shift

2 Console Checks for VnmrS/400MR/Inova/MVX AJR 11/15/07 Transmitter Paths Tests (VnmrS/400MR/Inova): Note: The results of the transmit path tests below can vary depending on the length of cable used & max frequency of the scope. Measuring higher frequencies (H1) than the scope can handle or excessively long cables (try to use the lock cable) will result in lower measurements. To test the High band and low band paths: 1) Retrieve the H1sn parameters from /home/vnmr/parX00/tests & set these parameters (the par X00 refers to par400, par500, etc): pw=30, d1=0.1, at=0.2, nt=1e6, in=’n’, dp=’y’ tn=’H1’ when measuring proton (for VNMRS also set dn=’C13’) tn=’C13’ when measuring carbon (for VNMRS also set dn=’H1’) (for VNMRS/400MR: tn cannot equal dn) Note about tpwr: a) set tpwr=31 when NOT using a 30dB attenuator b) set tpwr=63 when using a 30dB attenuator or when measuring the attenuator outputs. Please use caution so as not to damage the scope or NMR probe. 2) After typing go, measure the following (Vpp) using the 50-ohm scope setting: Measurements at the TX (all systems): J2x3 H1/C13: 1.3 – 2Vpp Measurements at the attenuator outputs (all systems tpwr=63): J297 (H1) or J298 (C13): >600 mV Measurements at the cable (H1 or C13) that attaches to the probe: For VnmrS/Inova: H1: >= 4V (typical: 4.5 –5 V) C13: >= 9V (typical: 11v) For 400-MR: H1: >= 2.5V (typ: 3Vpp) C13: >= 11.5V (typ: 13V)

3 To test the lock transmit path: In the lock screen set lockpower to max & measure: - Lock Transmitter output: > 3Vpp - Lock signal at the probe: >1.1V (50-ohm setting) and pulse has a width of 5 msec when lock scan ON or 50usec when off


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