- Continuum instability ("ripple") can occur with all receivers, making pointing and focusing difficult.
- In general some receivers are better than others in this respect as summarized here:
- A100 generally OK for pointing. (2003-11-12)
B100 OK, is best for pointing. B100 is the standard reference for the heterodyne pointing model
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C150 often bad for pointing, ripple. (2002-07-16) - D150 generally good performance for pointing.(2002-07-16)
- A230 often unstable, bad for pointing and flux monitoring. (2003-11-12)
- B230 OK
- C270 can be unstable and difficult for pointing. (2007-04-30)
- D270 can be unstable and difficult for pointing. (2002-07-16)
