Re: Shortwave filters for K3

Posted by Steve Ellington on May 03, 2009; 6:53pm
URL: http://elecraft.85.s1.nabble.com/Shortwave-filters-for-K3-tp2778285p2779812.html

Don
This doesn't quiet make sense to me. I have the 6khz filter in my K3. The BW
indicated on the K3 is 5Khz. If I add the 12 KHZ filter and the K3 still
says 5KHZ and that 5KHZ is the "audio" bandwidth, what good have I done?
Most any old SW receiver sounds a bit muffled at only 6khz bandwidth.
Opening them out to 10 or even 15 KHZ always makes them sound better. Yes I
know the BCB stations are limited to 5 Khz but just compare the K3 to a
wideband rx and note the difference.
Steve Ellington
[hidden email]
----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: <[hidden email]>
Cc: <[hidden email]>
Sent: Sunday, May 03, 2009 2:01 PM
Subject: Re: [Elecraft] Shortwave filters for K3

> 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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