[time-nuts] LPRO testing
EWKehren at aol.com
EWKehren at aol.com
Sun Jan 20 16:17:18 EST 2013
I do not have a LPRO nor a schematic but all Efratom units I have played
with have identical loops. They also use the 1 uF capacitor for sweeping.
Adding an other larger capacitor in parallel and the sweep slows down and you
can observe 127 Hz behavior.
Bert Kehren
In a message dated 1/20/2013 3:18:58 P.M. Eastern Standard Time,
lists at rtty.us writes:
Hi
Yes, unless you have some very unusual gear, it's tough to get a good view
of the warmup / lockup sweeps *and* the performance of the LPRO after it's
locked.
The main questions on the lockup sweep is going to be:
1) does it make it to / past the right frequency?
2) how soon after it does get there, does it lock up?
3) if it doesn't lock up, does it do something odd as it sweeps past the
right frequency?
Not terribly complex.
Bob
On Jan 20, 2013, at 9:33 AM, Magnus Danielson <magnus at rubidium.dyndns.org>
wrote:
> On 01/20/2013 04:08 AM, Bob Camp wrote:
>> Hi
>>
>> I just watch them with a reasonable counter that will give me 0.1 ppm
resolution.
>> Since the sweep is fairly fast, you can't have an overly long gate
time. The real
>> thing you want to catch is the frequency at each end of the sweep. It
waits there
>> long enough that you don't have to go crazy to catch it.
>
> As I suspected.
>
> I would have to switch mode for fine-tuning anyway.
>
> Cheers,
> Magnus
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