I use two ZHL-32A buffer amps, the appropriate Mini-Circuits LPFs, and 20 dB pads into a 4-way Mini-Circuits combiner. I believe it is ports 2&3 that have even better isolation than a 2-way combiner. These buffer amps run on 24 volts, where the ZFL-500LN doesn't have the output capability to test 100+ dB radios. Some tests need a third signal source and complimentary buffer amp and associated items.
To test a K3S or an IC-7851, it also requires HP 8642A generators that have lower phase noise than these top of the line rigs. Even my 8662A generators are not good enough, though they were 5 years ago. Now add the Flex 6700 and the ANAN-200D, the RMDR performance of a hand full of rigs is amazing. Unfortunately transmitter performance has not kept pace with receiver improvement. It will be interesting to test the new IC-7300 DSR with knobs (and lots of menus). Rob NC0B Sent from my iPad > On Mar 26, 2016, at 6:00 PM, "jimlux" <[email protected]> wrote: > > > >> On 3/26/16 2:30 PM, Rob Sherwood. wrote: >> You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. >> > > Yeah, I kind of figured that after getting the S parameters from minicircuits. > >> Sent from my iPad >> >>> On Mar 26, 2016, at 2:00 PM, "jimlux" <[email protected]> wrote: >>> >>> >>> >>> Consulting the time-nuts hive mind here.. >>> >>> I'm looking for off the shelf connectorized amplifiers with very good >>> reverse isolation for doing things like intermod measurements (e.g. 2 >>> signal generators followed by amps/pads into a combiner) and phase noise >>> measurements for a digital receiver. >>> >>> 1-100 MHz kind of frequency range.. >>> >>> I've used ZFL-500LN (30dB gain, 27 dB directivity in the data sheet, which >>> I interpret as 57dB reverse) , ZX60-4016 (really more of a microwave amp, >>> and not so hot reverse wise.. 25 dB) >>> >>> I'm not particularly cost constrained, so a higher power amp (which also >>> reduces distortion products from the amp) followed by pads is always an >>> alternative. >>> _______________________________________________ >>> 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. >>> >>> >>> >>> -- >>> If this email is spam, report it to >>> https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg2NjQ0MTI4Mjpyb2JAbmMwYi5jb206ZGVsaXZlcmVk >>> >> _______________________________________________ >> 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. > > > > -- > If this email is spam, report it to > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg2NjQ2NDY5Nzpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > _______________________________________________ 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.
