[GreenKeys] CRT Question

[Lester Veenstra]

In the Altronics Howard Model L they took the channel filter (Mark and space
filters) and passed them to a dual channel amplifier, driving the
oscilloscope plates, However, across the plates were an additional high q
tank (the usual 88 mhy torroid based). Since this was a very high impedance
point (the scope defection plates), the high Q allowed a very narrow
bandwidth. Therefore, instead of the usual sloppy bananas tuning display, he
was able to present a clean crossed line display that allowed unambiguous
tuning.


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
Jeffrey D Angus
Sent: Thursday, August 20, 2015 1:03 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] CRT Question

On 8/20/2015 11:37 AM, Jim Haynes wrote:
> On Fri, 21 Aug 2015, Dave Horsfall wrote:
>
>> Back when I was teaching myself this 'lectronic stuff, that was 
>> called an
>> eye diagram.  You really have to see it, to know why.
>
> I don't think so.  An eye diagram, as I understand it, involves a scope
> with a linear sweep synchronized to the data stream, and superimposing
> many sweeps of the data.
This is an eye diagram and it's down as a swept trace.
<http://centers.njit.edu/sites/ecelab/files/lcms/manuals/electrical-engineer
ing/ece-489/geye.gif>
> What we are talking about here is a crossed-ellipses pattern.
<https://hackadaycom.files.wordpress.com/2013/09/orthagonal-e1379708586119.j
pg>
And watching it on a scope
<https://www.youtube.com/watch?v=2JuHhya4uq4>


-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com

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