As I said before it is even by today's standards an excellent analyzer and
I am sure there are people out there for that reason willing to pay the
money for a LCD display.
Bert Kehren
In a message dated 9/26/2011 10:56:30 A.M. Eastern Daylight Time,
n...@verizon.net writes:
The kit costs more than the analyzer.
If someone finds a good LCD panel and does the mechanical design for
mounting I can begin work on an "open source" design for the
electronics part.
That would expand the market to far more of us.
On 09/26/11, shali...@gmail.com wrote:
There are aftermarket color LCD replacement available for the HP 8566
and HP 8568 analyzers, either as a do-it-yourself kit, or as a turn-key
service.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: [1]ewkeh...@aol.com
Sender: [2]time-nuts-boun...@febo.com
Date: Mon, 26 Sep 2011 07:01:36
To:<[3]time-nuts@febo.com>
Reply-To: Discussion of precise time and frequency measurement
<[4]time-nuts@febo.com>
Subject: Re: [time-nuts] Any thoughts on best rubidium?
Roy,
for its time it was the best because of the spectral purity of its Osc.
The
big problem with the unit today is its CRT. Limited life and no
replacements. As rare as Cs tubes. If you can live with 1.3 GHz an
excellent choice,
the 22 GHz version because of source does not have as good
specifications.Also repairable, many parts are readily available.
Bert Kehren
In a message dated 9/26/2011 6:27:59 A.M. Eastern Daylight Time,
[5]phill...@btinternet.com writes:
Bert
What's your opinion of the "old" HP8568B with its max. frequency range
of
1.3 Ghz and its weight of around 100 lbs. - are the more recent
instruments
that much better ?
Roy
--------------------------------------------------
From:<[6]ewkeh...@aol.com>
Sent: Sunday, September 25, 2011 10:47 AM
To:<[7]time-nuts@febo.com>
Subject: Re: [time-nuts] Any thoughts on best rubidium?
If you want low noise in a spectrum analyzer it all comes down to the
signal quality into the first mixer. Every thing else with today's
technology
is down hill.
Bert Kehren
In a message dated 9/25/2011 5:32:31 A.M. Eastern Daylight Time,
[8]rob...@delien.nl writes:
One other thing is that some spectrum analyzers aren't really
designed
for low noise performance. Since the noise floor is often pretty
high,
the design of the whole RF chain (e.g. spur levels and such) might
have
assumed that lots of things would be hidden in the grass.
True, it's one of the many selection criterions for selecting the
instrument that meets your needs.
I've been looking a the luggable HP series 859x and 856x, preferring
the
latter because they have a PLL YIG whereas the fist uses a
free-running
oscillator. But these machines are old, 80's and 90's, pricey, and
not
really
THAT good. Add decent range (up to 9GHz to see recent 5.8GHz devices)
and
a
tracking generator and before you know it, you'll be paying $6k or
more
for
a 20 year old instrument.
If the
analyzer is of the recent "bring a band of RF down to an IF, sample
and
FFT it for fine resolution" architecture, such things as the number
of
bits in the ADC and the "cleanliness" of the sampling clock might
have
been chosen based upon doing 1024 point transforms being displayed
with
100dB dynamic range (10dB/div and 10 divisions).
Most modern instruments do that, at least to some degree. My R&S goes
down
to a RBW of 10Hz by just mixing. Additionally RBWs of 5, 3, 2 and 1Hz
are
achieve by additional FFT. This instrument dates from 2001, but I
don't
think more recent instruments can achieve a mixing-only RBW of 5Hz or
below.
(not to mention the spectrum analyzer actually generating spurious
signals. I ran across that one last year and thought I had an
interference source, but, no, went back and checked the spec sheet
and
it said spurious are<-80dBc, and sure enough, there it was at -82
dBc.
And stories about the first LO coming back out through the input are
legion.)
Gee, I wish I had consulted this group BEFORE buying my instrument.
I'm
happy with it and I don't regret anything, but you could have added a
lot
more arguments in favor or againstA-c-AEURA|
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8. mailto:rob...@delien.nl
9. mailto:time-nuts@febo.com
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