[Lowfer] using HP 3581 or 3586 on VLF / LF

Mon, 20 May 2002 09:33:37 -0700 (PDT)

Hi Roger & Group,

Perhaps the link your referring to is:
http://www.qru.de/selective%20level%20meters.html

I'm not sure I've heard of anyone using a 15Hz to
50Khz Wave Analyser for VLF.  I don't know what your
really want to do with it but I found some specs on
it:
http://www.testequipmentdepot.com/usedequipment/hewlettpackard/spectrumanalyzers/3581aspecs.htm
I don't think it has any demodulator or speaker
onboard so you may be disappointed.  For VLF, just
hook up an active antenna to your computer soundcard &
use SpecLab, Spectrogram, or Spectran.

GL & 73 de Mike KB6WFC k

--- Roger Rehr W3SZ <[email protected]> wrote:
> Hello, All!
> 
> I saw a reference somewhere (I think) to using HP
> Signal Analyzers [like the
> 3581 (for 0-50 KHz) or the 3586 (for 50 KHz and up)
> ]  receivers.  But now I
> can't find the references.
> 
> I did find a nice site on using the HP 310 in this
> manner.
> 
> Since I have come back from Dayton with a couple of
> 3581A's I was hoping
> someone could guide me on this.  It seems that I can
> get two types of output
> from the 3581
> 
> 1.	At the 'output' BNC, I get a signal the same
> frequency as the original,
> but at much larger amplitude (several Volts out from
> -79 dBm in, for
> example)
> 
> 2.	A signal meant for an X-Y plotter that also up to
> several volts output,
> but at the low frequencies you'd expect for an X-Y
> plotter.
> 
> My thoughts thus far are:
> 
> 1. 	to use the 3581's as a preselector/preamplifier
> and feed the outputs
> (which will need attenuation) into an existing VLF
> receiver (then all they
> do is narrow the bandwidth and amplify) or
> 
> 2.	use the pen plotter output to trigger an audio
> oscillator when the signal
> comes above a certain level, thus producing a CW
> signal.
> 
> Are there other approaches people have tried with
> the 3581A?
> 
> How about with the 3586?  How is is done with those?
>  Is it worth my picking
> up a 3586 A / B / C if I find one cheaply?
> 
> Thanks in advance.
> 
> Thus far there seem to be a good number of 3581A's
> out there, so I hope they
> are useful.  I paid 25$, and 2 of 2 I got seem to
> work OK.
> 
> 73,
> 
> Roger Rehr
> W3SZ   FN20ah
> 2 Merrymount Road
> Reading, PA  19609-1718
> http://www.qsl.net/w3sz
> 
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