[time-nuts] Frequency Comparator Ideas needed

Jose Camara camaraq1 at quantacorp.com
Thu Aug 11 21:07:02 UTC 2011

If this is not a board design situation, but just a lab setup to measure and
characterize it, the 53310A could also work, giving a plot of frequency x
time, right on the instrument. GPIB can bring data out, too. They go for
$300 to $1500 on eBay.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: Thursday, August 11, 2011 1:29 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Frequency Comparator Ideas needed

 Seems to me like an HP 5335A is well suited to this task.  It measures
frequency in the required range and has adjustable gate times so you can get
updates at the rate you need.   These sell on eBay for as low as $200 and
from other placed for $600.  They have signal conditioning, and a computer
interface all in one rack mount box.  Accuracy is better then you say you

On Thu, Aug 11, 2011 at 1:10 PM, Dan Kemppainen
<dan at irtelemetrics.com>wrote:

> Hi All,
> I could clairify things a little. My event of interest is basically a fast
> frequency shift of a signal that drifts between 1800 and 2600Mhz. There is
> slow drift of this signal of many hundreds of Mhz, with fast frequency
> shifts of approximatley +/- 150Khz. I believe that the 150Khz shifts are
> nearly instantaneous, but currently have no way to measure exactly how
> they occur. Slow drifts are corrected for by a loop in the down converter.
> Currently there is a first down conversion stage to ~900Mhz. This is then
> down converted again to an arbitrary frequency band (50Mhz in this
> but this could be moved from ~10Mhz  to 200Mhz or greater).
> Obviously it would be advantageous to keep the low frequency band as high
> as possible, at least when trying to determine when the frequency shifts
> occur with any digital detectors. Probably for any analog detectors also.
Chris Albertson
Redondo Beach, California
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