The hp 00105-6013 and its variants used in the older 105A, 5061A, 5065A,
and a couple counters also has a crystal filter (5Mhz). I believe it's
the last HP oscillator to do so. If your output amplitude seems low try
tweaking the filter adjustment!
Cheers,
Corby
>> Learned Gentlemen,
>> Both the HP 106 and 107 have a post oscillator crystal filter. There
>> is also a 10 MHz crystal filter used in my Tracor 527E FDM.
>> So the question I have is there anything to be gained by adding 10
>> MHz crystal filters to the 10811 and similar OCXO's? They are
I don't have sophisticated instruments, so I did a basic test. Feed 2MHz into
a spectrum analyzer and place a 2MHz crystal in series. I didn't concern
myself with impedance matching or any other details. Just a coax in and out.
It basically acts like a very sharp filter. What it does to
One of my Sulzers on an oddball frequency seems, from the phase noise
plot, to have a crystal filter about 1 kHz wide -- see attached.
John
On 3/26/20 8:04 PM, Richard (Rick) Karlquist wrote:
> On 3/26/2020 3:03 PM, Perry Sandeen via time-nuts wrote:
>> Learned Gentlemen,
>> Both the HP 106
Hi
Narrowband filters have significant amounts of delay. Any change in that delay
(like from
temperature or ……) will phase modulate the oscillator. Conventional wisdom
these days
is that your ADEV will be better without the filter.
Phase noise wise, you can only get just so close to the …
A constant temperature oven for the crystal filter may be required to minimise
the crystal filter phase shift tempco contribution to the output phase
stability.
Bruce
> On 27 March 2020 at 11:03 Perry Sandeen via time-nuts
> wrote:
>
>
> Learned Gentlemen,
> Both the HP 106 and 107 have a
Learned Gentlemen,
Both the HP 106 and 107 have a post oscillator crystal filter. There is also a
10 MHz crystal filter used in my Tracor 527E FDM.
So the question I have is there anything to be gained by adding 10 MHz crystal
filters to the 10811 and similar OCXO's? They are very inexpensive
