Right now I'm mostly aligning IF stages of boat anchor rigs, not designing
new
stuff or trying to evaluate performance of newer rigs, so I think the 8660
will
do the job until I can afford something better. I'm debating what to buy
later,
but it appears most of the older rigs with better specs and that are
well-liked
here start at $500(It "powers on") to $1000(Tested and calibrated) and can
easily go as high as one wants to spend on newer gear. I'm sure I will wind
up
that far into the hobby... Just not yet! I appreciate all the information
from
the group, I'm learning a lot.
Nathan KK4REY
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On Sat, Jan 16, 2016 at 19:32, Discussion of precise time and frequency
measurement <[email protected]> wrote:
I did some interpolation to compare the specs for phase noise of the 8660
the
way it was done then to the present method. I think it is going to be
something
like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier
frequency.
As a comparison, the 8662A is about -135 dBc/Hz and the 8642A is better
than
-150 dBc/Hz.
Actual measurements on multiple generators in my lab. Unfortunately I have
never
used or measured an 8660.
3335A -128 dBc/Hz
3336C -120 dBc/Hz
3325A -115 dBc/Hz (original version. Later improved by 4 pr 5 dB after the
3336C
came out.)
As a comparison a Rigol DG4162 is -115 dBc/Hz
All at 10 kHz offset and on the 20 meter band.
It depends what you are trying to measure. Sensitivity or noise floor,
anything
will work within the range of specified output accuracy and leakage. On the
other hand, if you are trying to measure the dynamic range of a receiver,
or its
phase noise characteristics, you cannot do that with most generators.
Rob, NC0B
Sent from my iPad
> On Jan 16, 2016, at 3:10 AM, "Richard (Rick) Karlquist"
<[email protected]> wrote:
>
>
>
>
>
>> On 1/14/2016 12:35 PM, Nathan Johnson wrote:
>> What does the group think of the HP 8660? Just scored a broken one too
cheap
to
>> pass up. I know it's not gonna be the last signal generator I buy, but
for
under
>> $100 shipped it should be an interesting project.
>> Nathan KK4REY
>
> When I worked at HP, I had the chance to discuss this product
> with various engineers who were involved in its development.
> It frankly wasn't one of the better products in the line.
> It has a high broadband noise floor. The follow on
> product, the 8662, is MUCH better. No comparison.
>
> Rick Karlquist N6RK
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