[HomeBrew] BPF question

[Jim Garland]

Hi Steve,
You'll need to put a 50 ohm load on the output of the BPF, and also make
sure your DDS freq generator has a 50 ohm output impedance.  (If it doesn't
then use a 50 ohm feedthrough termination.  Then put your scope across the
50 ohm load and measure the voltage as you sweep the frequency.  If your
freq generator has any sort of calibrated frequency output, you won't need
to use your frequency counter at all.
73,
Jim W8ZR

> -----Original Message-----
> From: homebrew-bounces at mailman.qth.net
[mailto:homebrew-bounces at mailman.qth.net]
> On Behalf Of Steve
> Sent: Sunday, September 19, 2010 9:40 AM
> To: HomeBrew at mailman.qth.net
> Subject: [HomeBrew] BPF question
> 
> ** Please do NOT cross-post messages when posting to HOMEBREW **
> 
> This is probably a dumb question .I've built up a 10 meter Band Pass
filter
> and I would like to check it. I have a DDS freq generator, a freq counter
> and a scope .Can I just sweep the filter and watch my freq counter for
> output or do I need to also use the scope and see when the output waveform
> starts dropping off and check that against my freq counter?
> 
> 
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> 
> Steve
> 
> KG4JNL
> 
> 
> 
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