[Test-Equipment] question

[Fuqua, Bill L]

I have used various Kronhite filters in the past. Mostly have been the low-pass, high-pass types. These are great for  research applications where you must be confident fo the precise filter parameters. They are low noise and very reliable. You can do a lot of what these do with computer programs and sound interface but not quite as precisely due to gain variations and unknown noise characteristics of the sound cards. Also, in using sound interfaces I have noticed some cross talk between the input and output channels. When dealing with very hgh gain or sensitivity measurements these can be a problem. I have had to use a external sound interface as an input and internal one as output to get around the problem  I have found it in every computer I have tried to use in such experiments. 

73
Bill wa4lav

________________________________________
From: test-equipment-bounces at mailman.qth.net [test-equipment-bounces at mailman.qth.net] On Behalf Of Barry [n4buq at knology.net]
Sent: Saturday, December 12, 2009 9:12 AM
To: test-equipment at mailman.qth.net
Subject: Re: [Test-Equipment] question

Thanks for asking that.  I, too, have a K-H function generator and had
wondered what the K-H filters were typically used for.

Barry - N4BUQ

> Hi. It's time for "Ron's dumb question of the week"......
>
> I notice that on ePay, there are a lot of Krohn-Hite 'Band Pass
> Filters', at some pretty good prices (I suppose).  I have a K-H
> function generator and it is VERY well made and $.
> How would one of these filters work as an audio filter??
> Some have the ability to do both high pass and low pass at the same
> time, others let you choose one or the other. I have quite a few audio
> filters here, but thought that one of these K-H filters configured to
> cut off below, say, 700 Hz and above 750 Hz would make a heck of an
> audio filter for CW.
>
> Or would it?? It seems that can function from just a couple of Hz up to
> waaay beyond our hearing limit..
>
> thanks!!!!
>
> ron
> N4UE

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