To be correct, I was a bit fast with my statement before and I have to add, that the sensitivity in fact is higher at the lower frequencies:
@ 50 MHz --> -31 dBm @ 100 MHz --> -40 dBm @ 200 MHz --> -50 dBm @ 250 MHz --> -50 dBm @ 500 MHz --> -50 dBm @ 1000 MHz --> -44 dBm @ 2000 MHz --> -37 dBm @ 2500 MHz --> -28 dBm This is perhaps now more helpful for the experts, sorry Nigel and Rick for my previous misleading info, regards Arnold Am 19.11.2013 21:19, schrieb XPMUser: > Hello Nigel, > and hello Rick, > > thank you for the hint to and the remarks concerning > the 3 GHz extender from SQ5ESM. > > I ordered one unit and got it within a few days last week. > I am very happy with it in my 53132A, looks like the original > from HP in detail. Also the manufacturing quality seem to > be of high grade, worth the money. > > I checked the sensitivity using my 8663A up to 2.5 GHz(and > Trimble Thunderbolt for the reference frequency). The service > manual says that the reading shall be stable up to -27 dBm. > My unit is stable up to -28 dBm to -29 dBm, -30 dBm is too > low. So the unit does work very fine and behaves as decribed > by HP, does seem to be a realy good work using quality parts > as stated by the seller. > I have no idea why yours is showing different values. Did you > check it again? > I hope the original design by HP does meet the criteria > mentioned by Rick ;-) > > Thanks again for all the very interesting comments, > > regards, > > Arnold > > > > Am 09.11.2013 01:03, schrieb Richard Karlquist: >> On 2013-11-08 15:49, gandal...@aol.com wrote: >> >>> >>> At 1000 MHz, the highest frequency I can generate right now, I've >>> measured >>> the channel 3 input sensitivity as -50dBm with a sinusoidal signal. >>> >>> Regards >>> >>> Nigel >>> GM8PZR >>> >> >> This high sensitivity is probably a bad thing, not a good thing. >> It is indicative of a dynamic divider. For a frequency counter >> prescaler, you want a static divider, such as the HP5386 used. >> Dynamic dividers make errors if the signal being measured >> has a broadband noise floor or sufficiently high spurs at any >> frequency. >> >> Rick Karlquist N6RK >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.