[Test-Equipment] PTS250 - was General Radio module

[Fuqua, Bill L]

I just went to the office for a few minutes and checked. I have two PTS250 manuals there (they belong to the NMR lab) and they are older ones using DM1000
modules. 
   The question gets down to a very basic mathematical principle. DeltaF*DeltaT>1 .
For example to resolve 1 Hz you must count for 1 or more seconds. For .1Hz you must count for 10 or more seconds.
And you can say that the actual frequency resolution is limited by the time that the signal exist. That is a signal that 
exist for 1 second has a minimal bandwidth of 1 Hz. It can't have a bandwidth of less than a Hertz.  Simply because it 
has not been around long enough to have enough zero crossings. A difficult thing to wrap your mind around at first but
after studying it for a while you will understand. 
This relates to another one "HUP"  DeltaE*DeltaT>h
You get the second from applying the first and  E=hF.
Either you will recoginize the relationships or not. 
73
Bill wa4lav

________________________________________
From: test-equipment-bounces at mailman.qth.net [test-equipment-bounces at mailman.qth.net] On Behalf Of GandalfG8 at aol.com [GandalfG8 at aol.com]
Sent: Thursday, December 29, 2011 6:03 PM
To: test-equipment at mailman.qth.net
Subject: Re: [Test-Equipment] PTS250 - was General Radio module

Must admit I hadn't considered your first option and would need to think
about that one too.

It was the second one that seemed to me very promising but perhaps too good
 to be true, just adding more DM modules and extending the resolution ad
infinitum seems like a great idea but I'm not sure whether or not that  might
just be looking for the proverbial non existent free lunch:-)

I've decided to take some pdf PTS manuals away with me and will  take a
look through those if I get the chance, always assuming I'm allowed  to sober
up enough to do so:-)

regards

Nigel
GM8PZR



In a message dated 29/12/2011 22:45:26 GMT Standard Time, wlfuqu00 at uky.edu
writes:

I see  that you have two possibilities.
One is to take the output of one PTS with  the it set to 14 MHZ and just
change the .999999 MHz digits.
That will  produce the 14.000000 to 1.999999 MHz needed to go into the
first decade  module.
Or you can take the output of the last DM module and put it into  the first
DM module of the second  one.
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