[Test-Equipment] Q and filters

[Carl]

Its very possible to do with LC components vs the group delay thru a 
mechanical or crystal filter.

The CIA couldnt use a R-390A for data due to the distortion and had a 
special model built using the earlier R-390 all LC IF section.

Listen to a properly aligned HRO-60 with its many IF transformers, even SSB 
sounds different (better).

Carl
KM1H


----- Original Message ----- 
From: "Brian Burns" <brian at lessonsinlutherie.com>
To: "'Discussion of Electronic Test Equipment'" 
<test-equipment at mailman.qth.net>
Sent: Sunday, June 22, 2014 11:34 AM
Subject: Re: [Test-Equipment] Q and filters


> Hello Carl,
>
> ~ Ive built several of his passive filters to get rid of high frequency
> hiss, they work great compared to noisy and distorted active filters.
>
> What I can't quite believe is that it's possible to build a narrow 
> passband
> filter (high Q?) without ringing. Am I missing something here?
>
> Cheers,
>
> Brian
>
>
>
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