[Elecraft] Filter bandwidth

[Joe Subich, W4TV]

Your operation is as expected.  Note the information from the 
release notes for the current (beta) firmware: 

> * AM DSP BANDWIDTH DISPLAY NOW SHOWS *AF* BANDWIDTH, NOT IF. 
> We originally showed the IF bandwidth in AM mode since some 
> operators might be thinking about the underlying AM-mode 
> implementation (i.e., the IF bandwidth has to be twice the 
> AF bandwidth in this mode). But this was causing a lot of 
> confusion, and was inconsistent with the way the DSP bandwidth 
> control works in other modes, where the *AF* bandwidth is 
> displayed. Also, LO and HI CUT show AF cutoff points - not 
> IF - even in AM mode. So we now consistently define the 
> function of all DSP controls as showing AF frequencies/
> bandwidths. 

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Gary Smith
> Sent: Wednesday, January 14, 2009 8:45 PM
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] Filter bandwidth
> 
> 
> I have the , 6K AM, 2.8K, 1K & .250K filters
> 
> Position:
> (1) 13K
> (2) 6K
> (3) 2.8K
> (4) 1K
> (5) .250K
> 
> When I adjust the width in the FM mode; under the XFIL it shows fil1 
> but N/A to the right when I look for the bandwidth
> 
> In the AM mode under Xfil it shows:
> FL1 BW 5.00 to 3.20 
> It then jumps to FL2 BW 3.0 to 1.45
> It then jumps to FL3 BW 1.35
> (I do have FL1, 2 & 3 engaged under AM)
> 
> In the SSB mode under XFIL it shows: (ESSB enabled)
> FL2 BW 4.00 to 2.90
> It jumps to FL3 BW 2.8 to .15
> 
> In the SSB mode under XFIL it shows: 
> FL3 BW 2.8 to 1.10
> FL4 BW 1 to .30
> FL5 BW .25 to .05
> 
> CW reads as I'd expect but the AM filter BW does not show 6 (as the 
> 2.8 CW shows 2.8)
> 
> The AM mode with the 13K filter shows BW 5 and when the 6K am filter 
> is engaged the widest it shows is 3.00
> 
> Most curious to me is the 13K filter in FM as there is no BW reading 
> just a N/A and it's effect in AM seems to be a BW of 5.00
> 
> Are these the expected BW for AM & should the FM show N/A?
> 
> Thanks
> 
> Gary
> KA1J
> 
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