[Elecraft] Elecraft K2 filters?

[Matt VK2RQ]

In addition to the tuneable IF crystal filter, there are the KAF2 and KDSP audio filter option (check out the Elecraft website for details).

73, Matt VK2RQ

> On 2 Jun 2014, at 11:38 am, Mike K8CN <Mike.Carter at unh.edu> wrote:
> 
> Gavin,
> The K2 uses a single voltage-variable capacitance (varicap) diode-tuned
> crystal filter on the main RF board, and the filter bandwidths are
> programmable by the user within a moderate range.  A separate fixed
> bandwidth crystal filter is present on the KSB2 SSB option board if
> installed.  A "no additional equipment" procedure for adjusting the variable
> bandwidth filter is described in the K2 manual, but most operators use a
> computer-based spectrum analysis tool (e.g. Spectrogram) to visualize the
> filter passband while the tuning adjustment is being made.  Check out Don,
> W3FPR's web page (http://w3fpr.com/) for a link to the free versions of
> Spectrogram and tips on adjusting the K2 filter settings for different modes
> and desired bandwidths.  
> 
> 73,
> Mike, K8CN
> 
> 
> 
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