Hi Ulrich, Analog/Hitite https://eu.mouser.com/new/hittite-microwave/hittite-hmc832-pll/
Cheers, Magnus On 12/12/18 9:44 PM, Ulrich Rohde via time-nuts wrote: > Who makes it ? > > In a message dated 12/12/2018 3:43:23 PM Eastern Standard Time, > [email protected] writes: > > > FWIW, the HMC832 has FOM of -226. The best synth on a chip > now available AFAIK has FOM of -236. That's 10 dB better. > > Rick N6RK > > On 12/12/2018 10:46 AM, Dr. Ulrich L. Rohde via time-nuts wrote: >> I did some phase noise measurement and the 8751 is much better then the rest >> on the market >> >> Sent from my iPhone >> >>> On Dec 12, 2018, at 1:20 PM, Bob kb8tq <[email protected]> wrote: >>> >>> Hi >>> >>> Just to save others the time digging, the 7851 uses a HMC832 VCO + >>> fractional N PLL on a chip as >>> the heart of its synthesizer. Yet another “way to go” if building a quick >>> and simple signal source. >>> >>> === >>> >>> No argument at all about other parts of the radio having their limits. PA >>> performance certainly is one >>> of those areas. >>> >>> Bob >>> >>>> On Dec 12, 2018, at 12:42 PM, Dr. Ulrich L. Rohde via time-nuts >>>> <[email protected]> wrote: >>>> >>>> My feeling is >>>> A Because of the low sunspot cycle the large signal performance of the RX >>>> is less a topic, the ICOM 7851 dynamic range, synthesizer and frequency >>>> concept is winning but expensive >>>> B The power amplifier from 100 W to 1500 Watt need to be catching up to >>>> the old Collins tube Amps with negative feedback, producing - 45 dB or >>>> better IMD products. >>>> >>>> The military amplifier are fast on , reliable , durable and expensive... >>>> initially. >>>> >>>> The noisy blower may be a bad thing. >>>> >>>> I “only “ run 1 KW, and I am happy with it >>>> >>>> 73 de N1UL >>>> >>>> Sent from my iPhone >>>> >>>>> On Dec 12, 2018, at 10:47 AM, Bob kb8tq <[email protected]> wrote: >>>>> >>>>> Hi >>>>> >>>>> Usually on HF, the issue is large signal rejection. Phase noise very >>>>> definitely >>>>> gets into that part of things. Other components in the signal chain do as >>>>> well. >>>>> Once the synthesizer is no longer the weak link in the chain, spending >>>>> more >>>>> to improve it (vs spending on the other components) probably does not make >>>>> a lot of sense. Since the synthesizer is *far* from ideal, that sort of >>>>> begs the >>>>> question of just how troublesome the other parts are and how much better a >>>>> device *could* be built. >>>>> >>>>> This does seem to be wandering a bit from a Time related topic ….. >>>>> >>>>> It does illustrate the point that “good enough” may be way far away from >>>>> “pretty good” and yet even more distant from “as good as it gets”. The >>>>> question on any system is always “how good do you need / what are you >>>>> doing?” …. >>>>> >>>>> Bob >>>>> >>>>>> On Dec 12, 2018, at 8:49 AM, jimlux <[email protected]> wrote: >>>>>> >>>>>> On 12/11/18 3:26 PM, Bob kb8tq wrote: >>>>>>> Hi >>>>>>> As I said, just how rational using these parts in a radio …. not at all >>>>>>> clear to me. >>>>>>> Back when I went to school, stuff that was this noisy was not in the >>>>>>> “greatest” category. >>>>>>> That was a *very* long time ago. >>>>>>> Oddly enough best performance synthesizers have gotten better. (as the >>>>>>> posted >>>>>>> presentations very clearly show). Just why a “high end” radio uses a >>>>>>> less than >>>>>>> ideal synthesizer likely relates more to cost (even at a price of >>>>>>> thousands of dollars) >>>>>>> than to anything else. >>>>>> >>>>>> Or "good enough" performance - driving to a 3 dB NF for a HF receiver >>>>>> while maintaining good strong signal performance is probably not worth it >>>>>> >>>>>> >>>>>>> Indeed cost also drives things like GPSDO’s and GPS modules. We often >>>>>>> are not >>>>>>> very eager to acknowledge that fact. >>>>>>> Bob >>>>>> >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- [email protected] >>>>>> To unsubscribe, go to >>>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>>> and follow the instructions there. >>>>> >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>> and follow the instructions there. >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
