Hi Erik,
On 7/8/22 17:12, Erik Kaashoek via time-nuts wrote:
Not something I want to implement on short notice but maybe for the
future.
The biggest limitation in this DIY PNA is the phase noise of the
reference OCXO and the noise of the opamp amplifying the output of the
mixer.
So I was
I checked the Hittite/AD part at Mouser, $21 and change. Problem is,
they have a few, but it is marked obsolete/discontinued. Also, a
devilish package to work with. . .
On 2022-07-08 22:19, Mike Monett via time-nuts wrote:
To Bob kb8tq. You wrote:
Hi
The noise floor of the double
Hi
(see below)
> On Jul 9, 2022, at 12:06 PM, Erik Kaashoek wrote:
>
> Getting the simple PNA to lock was a bit difficult due to the overly
> simplistic translation of the mixer output to the Vtune of the OCXO
> To get some more flexibility I added a summing opamp that summed the mixer
>
Hi Mike,
On 7/8/22 15:34, Mike Monett via time-nuts wrote:
You wrote:
Mike,
He was using an analog mixer, but your comment about XOR mixer does
not apply to analog mixers. Your oversimplification that analog
mixer and XOR gates being the same thing does not apply here, and
thus the
I've been following the thread about Erik's DIY PN analyzer, and
wondering if it might be easy enough to use a frequency discrimination
method. I'm opening this in a different thread to avoid muddying the
water on the original (and long) one.
What I'm picturing is putting the DUT's output
Getting the simple PNA to lock was a bit difficult due to the overly
simplistic translation of the mixer output to the Vtune of the OCXO
To get some more flexibility I added a summing opamp that summed the mixer
output with the output of the coarse tuning potmeter. As the summing causes
inversion
Hi
As noted in another post, the phase detector guys talk
about a figure of merit that is not directly comparable to
the floor of a DBM. If I translate the -170 dbc/ Hz at 100MHz
on the DBM, to the PLL chip FOM, I would add 80 db. That
would make it a -250 dbc FOM vs the -231.
Since the FOM
I stripped a Wenzel 500-01362C 10MHz osc. module from an old Boonton 4220
power meter. This small can takes +15V, and draws about 60mA when
powered up.
initially it is roughly 1KHz high, but slowly creeps down in frequency.
after about 12 hours, it is
right on frequency (compared to my GPS),
to Bob kb8tq:
> The idea is partly to lock the two devices. The bigger objective is
> to hold the mixer output at the correct zero volt operating point.
> Cabling things to a different device and then doing phase correction
> to keep things at zero would be a major pain.
> Bob
All the more
HI
> On Jul 8, 2022, at 7:44 PM, Mike Monett via time-nuts
> wrote:
>
> To Erik:
>
> …….
> Another item that might be of interest is the PFD. The Hittite
> HMC984LP4E has -231 dBc/root(Hz) of noise, which is quite low. The
> datasheet is at
>
To Bob kb8tq. You wrote:
> Hi
> The noise floor of the double balanced mixer (used as a phase
> detector at 100 MHz) is in the -165 go -170 dbc / Hz range. I've
> used the parts you are talking about. Their floor is *way* higher.
> Bob
I stated the MC100EP140 would not match the Hittite
Dear Time-Nuts,
I need to generate some space in my basement...
I have three items I´d like to give to good hands:
1. HP5370A. Working fine *most* of the time. Sometimes the
noise of the time measurements rises from ~20ps to a few
hundred ps after some hours or so. Random activities with
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