[Test-Equipment] question

[Fuqua, Bill L]

I used to use a WWII beam filter between by HQ110AC and headphones.
Few people know what a Beam Filter is. They are passive sharp   
notch or bandpass filters. A three position switch that allowed it to be bypassed
 or used as notch or bandpass filter. 
If I toldyou the labeling on the switch it would be easy to guess what they were used
for. 

73
Bill wa4lav

________________________________________
From: test-equipment-bounces at mailman.qth.net [test-equipment-bounces at mailman.qth.net] On Behalf Of J. Forster [jfor at quik.com]
Sent: Sunday, December 13, 2009 2:21 AM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] question

There are other uses for filters than copying CW. If you want a CW filter,
get a purpose built one. A CW filter is essentially useless in an
electronics lab.

-John

===============


> Have a KH 3202 here and use it fairly often. Also have the manual and
> could scan it if needed. There are definitely better CW audio filters
> around these days but the 3202 should still give a good account of
> itself as a low pass filter.  Its main advantage is the predictable
> roll off characteristics in the various configurations in which it can
> be used.
> DaveB, NZ
>
>
> ----- Original Message -----
> From: <bonddaleena at aol.com>
> To: <boatanchors at mailman.qth.net>; <test-equipment at mailman.qth.net>
> Sent: Sunday, December 13, 2009 2:56 AM
> Subject: [Test-Equipment] question
>
>
>> 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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