Re: Shortwave filters for K3
Posted by
Don Wilhelm-4 on
May 03, 2009; 6:01pm
URL: http://elecraft.85.s1.nabble.com/Shortwave-filters-for-K3-tp2778285p2778533.html
Bill,
The 5 kHz width indicated for AM is the *audio* bandwidth, not the IF.
The IF bandwidth must be more than 2 times the audio bandwidth for an AM
signal - so your 12 kHz filter is good.
Remember that the 6 kHz filter must be used for AM transmit.
AFAIK, most broadcast stations limit their transmitted audio to 5 kHz,
so you are not likely to obtain much better fidelity than the K3 DSP
currently allows.
73,
Don W3FPR
Bill Maddock wrote:
> Guys,
>
> Just got done assembling my second K3 and this one has a 13 Khz
> filter where #1 had 6 Khz - I like to do shortwave listening - thought
> the wider filter would give better fidelity, but DSP only goes
> 5Khz wide is there a mode for this? I assumed with the 13khz roofer
> it would be opened up to 10 khz or more?
>
> Thanks and 73,
>
> Bill N4ZI K3 #1059 & K3 #2914
>
>
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