[AMMRL] Oscillating wave on WOBB curve

From: Sameer Al-Abdul-Wahid <s.wahid_at_uoguelph.ca>
Date: Wed, 13 Sep 2023 20:45:16 +0000

Dear AMMRL,

Our 500 MHz Bruker Avance II spectrometer has developed an issue: an oscillating
wave superimposed on the WOBB tuning curve. The wave has a frequency of roughly
150-160 kHz and appears for both 13C and 1H tuning.

The oscillating wave remains when I disconnect the RF cables between the HPPR
and probe, and the RF cables between the HPPR and amplifiers, and if I swap
SGUs (2 with 4, 1 with 3).

The wave is present but stops oscillating if I disconnect one or both of the
TUNE-IN or RF-OUT cables at the back of the HPPR. Same behaviour if I disconnect
one or both of the RF_IN or LO_IN cables on the RXAD-600 board.

I'd be grateful for any advice/suggestions!

Thanks,
Sameer

--
Sameer Al-Abdul-Wahid, Ph.D. | Manager
Nuclear Magnetic Resonance Centre | University of Guelph
50 Stone Rd E | Guelph, ON | N1G 2W1 | CANADA
519-824-4120 Ext. 58914 | s.wahid_at_uoguelph.ca<mailto:s.wahid_at_uoguelph.ca>
http://nmr.uoguelph.ca/



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Received on Thu Sep 14 2023 - 04:54:28 MST