Paul I was exactly where you are. The last thing I needed was an other Rb. But an Rb at $ 40 I did bite the bullet and running the tests I do not regret it. Bert Kehren In a message dated 12/9/2011 10:11:06 A.M. Eastern Standard Time, paulsw...@gmail.com writes:
Marco I understand also. But good enough for this conversation. What I find interesting is that you can not even find a good xtal these days for $40. Yet here is a complete package that delivers quite a bang for the buck. I have wavered back and forth on buying one since I already have numbers of these types of references. So far I have pulled back. Another one? Regards On Fri, Dec 9, 2011 at 9:54 AM, Marco IK1ODO -2 <ik1...@spin-it.com> wrote: > At 14:21 09-12-11, you wrote: > >> Marco >> Think you are correct for most things we do. >> However in communications for mixing and such a sine wave is desirable and >> a very clean output to minimize things like IMD and other products as we >> get the 10 MC to its final frequency. Since you are a ham you may >> appreciate that. >> Regards >> Paul >> WB8TSL >> > > Hello Paul, > > I understand, but don't agree 100% :-) - I mean, doing radio either you > use the 10 MHz for syncing oscillators in you chain (I do that for EME, all > is derived from a FRK-HLN), or you use the 10 MHz directly to a mixer. The > mixer usually is inherently non linear; if you look at the current in the > diodes of a ring mixer, it is almost squared. More it is squared, more > abrupt is the diode switching, better the mixer dynamic range. And many > mixers are sensitive to harmonics (see Tayloe mixer) of the input signal or > use harmonic mixing schemes (see any S/A), only possible if the mixer > current is highly non-sinusoidal. > So, I agree with Javier about the search for existence of low lever > spurious signals, but don't understand the need to have a (very) low > harmonic content. Oh, well, to have too many harmonics is a bad thing - one > time I had radiation problems from a coax feeding a 10 MHz squared signal, > with components over 100 MHz - but this is an extreme case. > > 73 - Marco IK1ODO / AI4YF > > > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<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.
