[R-390] More Voltage Divider Stuff

[Les Locklear]

Only if you want to hear that particular heterodyne on Pitcairn 
Island..............

YMMV

Les Locklear
Gulfport, Ms.
DX'ing Since '57
http://www.hammarlund.info/

----- Original Message ----- 
From: "Barry" <n4buq at knology.net>
To: "R-390-List" <R-390 at mailman.qth.net>
Sent: Monday, March 19, 2007 7:47 PM
Subject: [R-390] More Voltage Divider Stuff


>A few days ago, I posted some info on my 50:1 voltage divider project.
> Someone posted that there's a possibility that the 1-ohm resistor in it
> might have some inductance, thereby throwing off the calculations.
>
> I wondered about this, so I set up a little test.  I connected one input 
> of
> the dual-trace scope to the same point where the signal generator is
> connected to the divider.  I connected the other input to the divider 
> point.
> The generator has a high-output level so I was able to drive the scope to 
> a
> nicely-sized wave forms.  I set the "high" input to 1V/div and the "low"
> input to 0.02V/div.  The image below is at about 1.6mc.
>
> http://www.knology.net/~thelanding/R390A/traces.jpg
>
> Note that both waveforms are pretty much identical in amplitude.  (The 
> upper
> one doesn't appear to touch the upper line, but I didn't quite have the
> bottom of the waveform on the horizontal line either.)  In face, if I move
> them together, they appear as one.
>
> Just to verify things, I switched the inputs and reversed the V/div
> settings.  The results were exactly the same.
>
> I assume that if there is any inductance at play here, it is quite
> negligible.  I wish my scope had a higher b/w, but the TEK 561A with the
> plugins I have start falling off rapidly at this frequency.
>
> I wonder if it is worth checking at higher frequencies with a better 
> scope?
>
> Barry - N4BUQ
>
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