[time-nuts] Ebay FE-5680A Rb: Are they that good?

paul swed paulswedb at gmail.com
Fri Dec 9 10:10:51 EST 2011

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?

On Fri, Dec 9, 2011 at 9:54 AM, Marco IK1ODO -2 <ik1odo at 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
> 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
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