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, [email protected] 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 -- [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.
