Hi,
On 02/22/2018 02:53 PM, Bob kb8tq wrote:
> Hi
>
>
>> On Feb 22, 2018, at 8:22 AM, Attila Kinali wrote:
>>
>> On Wed, 21 Feb 2018 18:10:17 +
>> "Poul-Henning Kamp" wrote:
>>
So the Rb85 "notch" filter might not get rid of all the unwanted light
and some of this might depopulat
Hi
> On Feb 22, 2018, at 8:22 AM, Attila Kinali wrote:
>
> On Wed, 21 Feb 2018 18:10:17 +
> "Poul-Henning Kamp" wrote:
>
>>> So the Rb85 "notch" filter might not get rid of all the unwanted light
>>> and some of this might depopulate the excited state of the Rb87
>>> that are in the RF ca
On Wed, 21 Feb 2018 18:10:17 +
"Poul-Henning Kamp" wrote:
> >So the Rb85 "notch" filter might not get rid of all the unwanted light
> >and some of this might depopulate the excited state of the Rb87
> >that are in the RF cavity.
>
> I have a hard time seeing how you can not get worse S/N tha
Hi
There are a number of papers on LED / Laser excitation of Rb cells (and
other gas cells). They go back quite a ways. The gotcha (as pointed out
in PHK’s post) is that you need to stabilize the LED source. Doing that is
a bit complex. Doing that so that the result beats a gas lamp is a bit mo
In message <20180221184928.1c9b4c3a4d2e762970b5b...@kinali.ch>, Attila Kinali w
rites:
>So the Rb85 "notch" filter might not get rid of all the unwanted light
>and some of this might depopulate the excited state of the Rb87
>that are in the RF cavity.
I have a hard time seeing how you ca
Attila I haven't tried that and I suspect the lines are important because
that establishes the reference.
Now I would also suggest that an experiment like you suggest be tried on a
FRS-XXX cheapy Rb.
Easily dis-assembled and can be re-assembled back with the lamp. No harm.
Paul
WB8TSL
On Wed, Feb
Moin,
Has anyone ever tried using a LED instead of a discharge lamp for Rb standards?
There are quite a few and very cheap 780nm IR LEDs available. They usually
have a line width in the order of 20nm to 50nm (FWHM). This means that they
still need the Rb85 filter, but they would not produce all th