Filter bandwidth

[Gary Smith]

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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[Gary Smith]

Rats...

> I have the , 6K AM, 2.8K, 1K & .250K filters
Should have read...

13K, 6K, 2.8K, 1K & .250K filters

Gary
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[Joe Subich, W4TV-4]

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: [hidden email]
> [mailto:[hidden email]] On Behalf Of Gary Smith
> Sent: Wednesday, January 14, 2009 8:45 PM
> To: [hidden email]
> 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
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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