Shaped pulse problem

Lachlan Graham (Lachlan.Graham@dbce.csiro.au)
Thu, 5 Feb 1998 16:44:59 +1100

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Dear Colleagues,
I was checking slice profiles on our MSL 100 system and noted some odd =
magnetisation profiles. Further checking revealed that sinc pulses (4 =
ms long) out of the high power transmitter had the side lobes attenuated =
severely compared with the centre lobe. The modulator output and the =
low power transmitter did not distort the waveform significantly and the =
side lobes were of reasonable amplitude. Hard pulses seem to behave =
normally. I would be grateful for any suggestions as to what the =
problem might be before I call for service.=20
Regards,
Lachlan Graham

Dr L.J.W. Graham
CSIRO DBCE
PO Box 56
Highett
Vic 3190
Australia
Phone int 61 3 9252 6000
Fax int 61 3 9252 6240

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Dear Colleagues,
I was checking = slice=20 profiles on our MSL 100 system and noted some odd magnetisation = profiles. =20 Further checking revealed that sinc pulses (4 ms long) out of the high = power=20 transmitter had the side lobes attenuated severely compared with the = centre=20 lobe.  The modulator output and the low power transmitter did not = distort=20 the waveform significantly and the side lobes were of reasonable=20 amplitude.  Hard pulses seem to behave normally.  I would be = grateful=20 for any suggestions as to what the problem might be before I call for=20 service. 
Regards,
Lachlan Graham 

Dr L.J.W. Graham
CSIRO = DBCE
PO Box=20 56
Highett
Vic 3190
Australia
Phone int 61 3 9252 = 6000
Fax int 61=20 3 9252 6240 
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