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

EWKehren at aol.com EWKehren at aol.com
Fri Dec 9 10:19:32 EST 2011

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  
Bert Kehren
In a message dated 12/9/2011 10:11:06 A.M. Eastern Standard Time,  
paulswedb at 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?

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 
>> 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, 
> is derived from a FRK-HLN), or you use the 10  MHz directly to a mixer. 
> 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 
> 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 - 
> time I had radiation problems from a  coax feeding a 10 MHz squared 
> with components over 100 MHz -  but this is an extreme case.
> 73 - Marco IK1ODO /  AI4YF
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