[Boatanchors] [Test-Equipment] question

[Carl]

I have an old tube type SKL 302 which has a pair of independent tuneable hi 
pass/low pass filters that can be cascaded for bandpass. Ive used it many 
times to drag signals out of the noise on HF and VHF. It works a lot better 
than digital or passive audio filters Ive tried and I guess the audiophools 
stain their panties over them.

Carl
KM1H



----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Saturday, December 12, 2009 12:11 PM
Subject: Re: [Test-Equipment] question


> The K-H filters are certainly usable in the audio. They can be make a good
> sound system sound like a telephone in bandpass mode and a bunch of other
> things. They could likely filter out an annoying tone as a notch filter. I
> don't remember how good the noise floor is, but it's likely pretty good.
>
> In the lab, they are useful for cleaning up signals. Most are high
> pass/low pass/band pass/band reject.(Not all at the same time)
>
> Note, My comments refer to engineering based audio, NOT audiophoolery.
>
> Best,
> -John
>
> =============
>
>
>
>> 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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