[ARC5] ARC-2 Defines "Broad as a Barn"

[Geoff]

Considering what was being used then for transmitting that sounds about 
right. Remember, there wasnt much QRM to deal with either.

Carl


----- Original Message ----- 
From: "David Stinson" <arc5 at ix.netcom.com>
To: "ARC-5" <arc5 at mailman.qth.net>
Cc: "ARC-5 Yahoo" <ARC-5radio at yahoogroups.com>
Sent: Saturday, March 22, 2014 1:33 AM
Subject: [ARC5] ARC-2 Defines "Broad as a Barn"


> So now to see what can be done (non-destructively) to "tighten-up" the 
> selectivity of the ARC-2.
> First thing to do is see just how "wide" it really is.
>
> My test equipment and budget are quite limited, so here's what I did.  If 
> you can think of a better way
> that doesn't include me buying $400 logic analyzers,
> I'm "all ears."
> I put a scope on the speaker connection
> and used my restored LM freq meter to inject a
> modulated signal at 3890KC at a level that would not
> engage AVC action.  Adjusted the signal and scope
> to show 4V PTP.   Using my TR-7 as an external frequency standard,  I 
> varied the the LM in 1KC steps
> around the center freq.
> I have not done any alignment on the IF, so the results shown in this 
> chart are "as found:"
> http://home.netcom.com/~arc5/ARC-2/ARC2IFOrig.jpg
> I think "W-I-D-E" is putting it mildly ;-).
> So this is my starting-point for my fiddling-to-come.
>
> Impressions, suggestions?
>
> 73 DE Dave AB5S
>
>
>
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