[Test-Equipment] Q and filters

[Francesco Ledda]

It was not data; it was for DF applications.

Sent from my iPad

> On Jun 22, 2014, at 7:16 PM, "Carl" <km1h at jeremy.mv.com> wrote:
> 
> 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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