[time-nuts] Very Accurate Delta Time RF Pulse

[David]

I have an Optoelectronics 3000A and as far as I know, the only thing
distinguishing this capability from any other frequency counter is
discrimination on the digital side which filters unstable counts.  In
practice it operates like an FM receiver where the strongest signal
captures the input.  If I put the same antenna on one of my other good
frequency counters, they perform about as well but will not hold the
last clear reading.

The Optoelectronics counters also have better signal conditioning than
many dedicated frequency counters which are intended to be used where
the input signal is well defined.

I think their later counters intended for this type of application
took this a step further by sweeping their input frequency range for
better selectivity.  I assume this was done with superheterodyne block
conversion but maybe they had something else going on like a
switchable swept RF preselector.

On Fri, 29 Jul 2016 23:18:07 -0700, you wrote:

>Hi Jerome:
>
>Some time ago a company called Opto Electronics made a frequency counter with a small antenna that would count the 
>frequency of a nearby signal.  They call these Near Field Receivers.
>Some modern scanner radios incorporate some of these ideas.
>http://www.prc68.com/I/BC125AT.html