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ESSB and the 6 kHz Filter

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David Ahrendts

ESSB and the 6 kHz Filter

Am I correct that you do not achieve 4.0 kHz ESSB (widest TX with the K3S) without selecting the 6.0 kHz crystal filter for SSB TX? Just want your affirmation. :—)

David A. KK6DA, LA

David Ahrendts [hidden email]

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Bob McGraw - K4TAX

Re: ESSB and the 6 kHz Filter

Using the K3 Utility, in checking the Filter Config list, while I do
have the 6.0 kHz filter installed, I must select the 2.7 kHz or 2.8 kHz
for CW and SSB transmit.

Then from the CONFIG menu ESSB I can select up to 4.0 kHz bandwidth.

Receive BW on AM will go to 5.0 kHz and on SSB 4.0 kHz.

73
Bob, K4TAX

On 1/29/2016 7:07 PM, David Ahrendts wrote:

> Am I correct that you do not achieve 4.0 kHz ESSB (widest TX with the K3S) without selecting the 6.0 kHz crystal filter for SSB TX? Just want your affirmation. :—)
>
> David A. KK6DA, LA
>
>
>
> David Ahrendts [hidden email]
>
>
>
>
> ______________________________________________________________
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Joe Subich, W4TV-4

Re: ESSB and the 6 kHz Filter

On 1/29/2016 8:40 PM, Bob McGraw K4TAX wrote:
> Using the K3 Utility, in checking the Filter Config list, while I do
> have the 6.0 kHz filter installed, I must select the 2.7 kHz or 2.8 kHz
> for CW and SSB transmit.
>
> Then from the CONFIG menu ESSB I can select up to 4.0 kHz bandwidth.

The K3 and K3S use the AM TX filter for ESSB wider than 2.8 KHz.

> Receive BW on AM will go to 5.0 kHz and on SSB 4.0 kHz.

Receive audio bandwidth will never go beyond 4.2 KHz as there is a
fixed, audio lowpass filter following the digital to analog converter.
In any case, the true audio bandwidth is FC +/- BW/2 for all modes.

Even in AM the maximum value for BW is 4.00 (4 KHz) representing
a recovered audio bandwidth of 0 - 4000 Hz or 200 - 4200 Hz. If
FC (shift) is lower than 2.00, the actual bandwidth will be less
than 4 KHz even when BW = 4.00 due to the formula above (FC +/- BW/2).

73,

... Joe, W4TV

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Don Wilhelm-4

Re: ESSB and the 6 kHz Filter

In reply to this post by David Ahrendts

David,

Yes, you need the 6kHz filter for ESSB. The 2.8kHz filter will strip it
down to 2.8kHz.

73,
Don W3FPR

On 1/29/2016 8:07 PM, David Ahrendts wrote:
> Am I correct that you do not achieve 4.0 kHz ESSB (widest TX with the K3S) without selecting the 6.0 kHz crystal filter for SSB TX? Just want your affirmation. :—)
>

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N1EU

Re: ESSB and the 6 kHz Filter

In reply to this post by Bob McGraw - K4TAX

On Fri, Jan 29, 2016 at 8:40 PM, Bob McGraw K4TAX <[hidden email]>
wrote:

>
> Receive BW on AM will go to 5.0 kHz and on SSB 4.0 kHz.
>

Unlike AM, receive bandwidth will never go to 4KHz in ssb. For some
unknown reason, the receive bandwdith in ssb is restricted to about
3300Hz. My weekend project proving this point is visible at
http://k3s.wikidot.com

73, Barry N1EU

>
> 73
> Bob, K4TAX
>
> On 1/29/2016 7:07 PM, David Ahrendts wrote:
>
>> Am I correct that you do not achieve 4.0 kHz ESSB (widest TX with the
>> K3S) without selecting the 6.0 kHz crystal filter for SSB TX? Just want
>> your affirmation. :—)
>>
>> David A. KK6DA, LA
>>
>>
>>
>> David Ahrendts [hidden email]
>>
>>
>>
>>
>> ______________________________________________________________
>> 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]
>>
>
>
> ______________________________________________________________
> 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]
>

wayne burdick

Re: ESSB and the 6 kHz Filter

Administrator

I'll look into this later today.

73,
Wayne
N6KR

On Feb 1, 2016, at 5:43 AM, Barry N1EU <[hidden email]> wrote:

> On Fri, Jan 29, 2016 at 8:40 PM, Bob McGraw K4TAX <[hidden email]>
> wrote:
>
>>
>> Receive BW on AM will go to 5.0 kHz and on SSB 4.0 kHz.
>>
>
> Unlike AM, receive bandwidth will never go to 4KHz in ssb. For some
> unknown reason, the receive bandwdith in ssb is restricted to about
> 3300Hz. My weekend project proving this point is visible at
> http://k3s.wikidot.com
>
> 73, Barry N1EU