Hello Christophe, > I am using more and more sun noise as a tool > to optimize the frontends on 6, 3 and 1.2cm. What is the "best" way to do > this with linrad. For now, I just read the main dB scale visually, which is > quite easy to do up to say 0.1 dB. But maybe more intelligent things can > be done with other windows, averaging or numerical display of values?
The S-meter window is actually a very good way of getting averaged RMS readings in Linrad. Make sure you have an "M" in the upper right corner to average RMS power. ("P" = peak power in a long time gives a far less stable reading) The bandwidth is of course important. Make sure your system is calibrated so you have a flat passband, then select a high output speed. On my system (WSE units) the standard is 96kHz for input and 48kHz maximum for output. By selecting 48 kHz for the output I can get a bandwidth of 35 kHz and then the S-meter graph gives data points that are to 90% within 0.03 dB when the graph speed is 1 point per second. By pressing F2 one can get an average over as long time as desired, but I think it is better to use the S-meter graph because system stability is likely to be more important than the statistical uncertainty. 73 Leif / SM5BSZ ############################################################# This message is sent to you because you are subscribed to the mailing list <linrad@antennspecialisten.se>. To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> Send administrative queries to <[EMAIL PROTECTED]>