[ARC5] ARC-5/274-N SAelectivity

[Bill Cromwell]

Hi,

Some hams have moved the windings farther apart inside the cans to 
increase selectivity. I am not sure how effective that really is. My 
approach has been computer sound card based DSP and more specifically 
using the DSP in SDR software for sound cards. The SDR software has the 
advantage of managing that tuning rate while narrowing the bandwidth and 
reducing noise (as a function or the narrower passband). I use quisk.

My approach does not require any modifications to the radio:)

73,

Bill  KU8H

bark less - wag more

On 9/27/20 5:13 PM, Doran Platt wrote:
> You all mention selectivity, or lack thereof.  Have any of you all tried 
> the modification to the IF transformers?  I done virtually all mine 
> (except, of course, the low freq. models) and a few more for others.  
> Bandwidth is reduced by about 50% with very little losses measured.  
> Sure makes things better on 80 and 40.
> Jeep K3HVG
> 
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