[Test-Equipment] HP 140T Analyzer and Storage

[Gary Schafer]

You do need storage to look at narrow filters such as less than about 5 KHz
wide. You need to run the sweep very slow at these narrow widths. Without
storage you can still see the response but it will not hold on the screen.

The same is true if you are using a narrow filter width in the analyzer
looking at signals that are very closely spaced. A very slow sweep speed is
required.

There were several different tubes available with different persistence
available in the 140 series. You want a fairly high persistence tube for use
as a spectrum analyzer or it will be hard to see what you are looking at as
the 140/141 series did not have real bright displays compared to modern
scopes.

If you can get the unit at a good price it will still be a fine thing to
have. You will probably use it in the faster sweep modes and wider
bandwidths mostly even if you have storage.

73
Gary  K4FMX


> -----Original Message-----
> From: test-equipment-bounces at mailman.qth.net [mailto:test-equipment-
> bounces at mailman.qth.net] On Behalf Of wabate
> Sent: Thursday, November 20, 2008 1:03 PM
> To: Test Equipment
> Subject: [Test-Equipment] HP 140T Analyzer and Storage
> 
> Thanks to all for your insights.  The info helps a lot.
> 
> I'll be making my mind up on purchasing the system in a few days.  There
> is one thing that is troubling.  If the 140T does not have storage
> capability, how important is that?  I've been told that for sweeping
> filters you need storage capability.  Is that the consensus?  I don't
> want to buy it and find out that I need to upgrade to the 141T to get
> the most out of it.  I never used an analyzer before and I'm unsure.
> 
> Thanks again for all your help.
> 
> Bill, K3PGB
> 
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