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

paul swed paulswedb at gmail.com
Fri Dec 9 10:33:46 EST 2011


I understand Bert.
But you wanted to test it. I actually don't have a real reason grab one of
these jewels.
Though understanding when the piles gone, its gone. Thats the way it works
on this stuff.
But I have 6 of the old cel site Lucent RBs all $20 and a Good HP 5065 and
then last spring a lpro 101 for $20.
Granted the Lucents are fairly old in years with OK lamp voltage still.
Just concerned about becoming a RB addict and having to join a multi-step
with-drawl program. God knows I may still buy two. Shipping included. :-)
Regards
Paul



On Fri, Dec 9, 2011 at 10:19 AM, <EWKehren at aol.com> wrote:

> 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,
> 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?
> Regards
>
> 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
> >> 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
> >
> >
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