[Test-Equipment] Q and filters

[Carl]

The ones Ive seen were used for crypto multi channel data links.

Carl


----- Original Message ----- 
From: "Francesco Ledda" <frledda at att.net>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Sunday, June 22, 2014 1:02 PM
Subject: Re: [Test-Equipment] Q and filters


> 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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