6 Khz filter question

[VE3WDM]

Good afternoon all, I have for some time now had the 6 Khz filter installed in my K3. I was just recently on JT-65 in Data A mode and wanted to use the 6Khz filter. I was only able to open the width to 4 Khz using the width knob? I wanted to open it up to 6 khz so I could receive both JT65 and JT9 signals.
Any ideas
Mike VE3WDm

       
               
                       
               
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[N1EU]

There's a 4KHz low pass audio filter inline that will limit the rx audio
passband, even if the width control allowed you to go higher.

Barry N1EU

On Sat, Jan 2, 2016 at 9:32 PM, Mike Weir <[hidden email]> wrote:

> Good afternoon all, I have for some time now had the 6 Khz filter
> installed in my K3. I was just recently on JT-65 in Data A mode and wanted
> to use the 6Khz filter. I was only able to open the width to 4 Khz using
> the width knob? I wanted to open it up to 6 khz so I could receive both
> JT65 and JT9 signals.
> Any ideas
> Mike VE3WDm
>
>
>
>
>
>                 This email has been sent from a virus-free computer
> protected by Avast. www.avast.com
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[Don Wilhelm-4]

Mike,

The K3 audio is limited by a LPF to 4 kHz.
Early on, the K3 audio was wider, but many complained about a high
frequency "hiss", so the LPF was installed.  (See the early K3 archives).
The WIDTH knob also has always been limited to 4 kHz.
The 6 kHz filter was *intended* for AM use, and a 6 kHz IF width will
result in an audio width of 3 kHz, so 4 kHz audio width is sufficient
for that.

You can tune the VFO when switching between JT65-HF and JT9.

73,
Don W3FPR

On 1/2/2016 4:32 PM, Mike Weir wrote:

> Good afternoon all, I have for some time now had the 6 Khz filter installed in my K3. I was just recently on JT-65 in Data A mode and wanted to use the 6Khz filter. I was only able to open the width to 4 Khz using the width knob? I wanted to open it up to 6 khz so I could receive both JT65 and JT9 signals.
> Any ideas
> Mike VE3WDm
>
>
>
>
>
> This email has been sent from a virus-free computer protected by Avast. www.avast.com
>
>
>    
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[Joe Subich, W4TV-4]

The DSP is limited to a maximum bandwidth of 4000 Hz and a highest
"high cut" frequency of 4200 Hz.  However, that 4 KHz (200-4200 Hz)
is more than adequate to cover both JT65 and JT9 sections of the
various digital activity (e.g., dial = 14.076 gives 14.0762-14.080
with no issues).

73,

   ... Joe, W4TV


On 1/2/2016 4:32 PM, Mike Weir wrote:

> Good afternoon all, I have for some time now had the 6 Khz filter installed in my K3. I was just recently on JT-65 in Data A mode and wanted to use the 6Khz filter. I was only able to open the width to 4 Khz using the width knob? I wanted to open it up to 6 khz so I could receive both JT65 and JT9 signals.
> Any ideas
> Mike VE3WDm
>
>
>
>
>
> This email has been sent from a virus-free computer protected by Avast. www.avast.com
>
>
>    
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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