[Test-Equipment] question

Sun Dec 13 12:07:22 EST 2009

Thanks for the reply. 
I was wondering how many out there knew what these were.
Kind of reminded me of an experiment a Physics Professor and I did  in our department.
We made up a list of questions for the faculty to answer with out using a calculator or anyother
reference.  The questions were mostly simple constants such  the log base 10 of 2. Square root of
two to as many digits you could remember and pi as well and others. 
  We were discussing how much younger students miss out on by not doing calculations by hand or using
a slide rule. 
   Well, guess what. Just about all the younger professors failed the test. 
I teach classes in radio theory and construction on the weekends for students of all ages.
I am introducing them to nomograms thinking that using these will give them an intuitive feel of 
what values to use or where to start in making simple RF circuits and to recognize grossly incorrect results in calculations.
   It always baffled my associate engineer when I would make something using a tuned circuit and
pick out a variable capacitor and wind a coil and it worked. Naturally, I did not tell him that the variable 
capacitor gave me a lot of slack but still, he and others would not have an idea where to even start.
This came from building a lot of HB transmitters and receivers when I was a kid.

73 
________________________________________
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 3:13 AM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] question

It was used with the A, N beacon system. One side of the heading you heard
Morse As, the other side, Ns. On the beam you heard a steady tone, the
result of ORing A & N in Morse.

-John

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

> 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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