[Elecraft] Shortwave filters for K3

[Frank Ross W4NHJ]

Don,

I thought I read some where that you can use the 13 kHz filter to transmit 
AM by using the transmit DSP to limit modulation bandwidth.

Frank

----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: <n4zi96 at yahoo.com>
Cc: <elecraft at mailman.qth.net>
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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