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

[Bruce Long]

Dave, the selectivity curve will "look" much better and will be easier to compare against other receiver selectivity curves if you plot the log of amplitude.

Plot point = 20 log ( Vout/Vmax)   Where Vmax = 4v

My applogies if this is obvious to you.  





On Saturday, March 22, 2014 11:19 AM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
 
On 22 Mar 2014 at 8:08, Kenneth G. Gordon wrote:

> On 22 Mar 2014 at 0:33, David Stinson wrote:
> 
> > 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?
> 
> Looks about what I had expected.
> 
> What is the IF frequency?

Well, I just tried fo find my copy of the ARC-2 manual, and can't...at this 
point. I was reminded that the ARC-2 has a variable IF: i.e., it varies as you 
tuned the range. This, of course, makes it unlikely that a "Q-5er" will work 
with it.

Secondly, I was also reminded that there is a way to non-destructively 
narrow up the IF by "adjusting" some coupling capacitors or parallel 
resistances in the circuit, but I have no details on that either.

Still looking...


Ken W7EKB
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