Hi The help file is correct, but possibly a bit misleading. Most of what they show could be done by a computing counter. They have been around long enough that they are a sub $100 ($50?) item these days. Clock jitter is going to be a very real limit doing what they are trying to do.
Bpb On Nov 13, 2012, at 8:27 PM, Malcolm <[email protected]> wrote: > I have been looking at the DG8SAQ VNA for other purposes and it is suggested > in the VNWA_Help.pdf on page 158 that it can be used as a high accuracy / > resolution counter. Document available at > http://www.sdr-kits.net/vnwasoftware/?20 . > > Ignoring any drift in the TXCO as I would drive it from an external reference > source ( GPSDO or Rb derived) of 36 MHz, being a (junior in knowledge) time > nut I added this as another reason to buy the VNA. However, I do have some > reservations and would like the comments of better qualified time nuts and > the answers to some questions:- > > 1. Can the VNA really have that level of resolution? > > 2. Is the resolution reduced in the ratio of the measured frequency to the > clock frequency e.g. at 360 MHz is the resolution 10 times worse than that at > 36 MHz? > > 3. Are there any other factors that should be taken into account when > performing frequency measurement please? > > Whether or not this feature works is not a deciding factor in my > consideration just a possible plus. > > Your comments please ladies and gentlemen. > > Regards > > Malcolm > G0MIC > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
