KX3 Question about use of ESSB for Data Modes

[David Box Comcast]

I am having a lot of fun learning as much as I can about the KX3 and really enjoy using it.  I have been playing with PSK-31 and using the Data mode with FlDigi.  The frequency range I am able to work is about 400Hz on low end due to receiver roll off and then the upper transmitter bandwidth is 2950Hz as the power rolls off sharply above this.  So I have set my waterfall in FlDigi to display 400 - 3000 Hz.

That range works very well and making contacts but was thinking tonight if the ESSB mode would broaden the available frequency span.  Not a fan of ESSB on voice but are there any negatives in using to extend bandwidth on digital modes like PSK-31.  I'll probably run some tests tomorrow but wanted to query the vast experience base of this group and see if this had already been checked.

Thanks,
Dave K5MWR


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[Don Wilhelm-4]

Dave,

For several reasons I would advocate DATA A mode over SSB (or ESSB) for
data modes.
First, most data mode signals are contained within the 300 to 3000 Hz
range when the VFO is set at the 'recommended' data mode band frequency.
Secondly, it is easy to move the VFO knob to hear and decode signals
that are operating at the extreme edges of that bandwidth.
Thirdly, using DATA A mode automatically turns off compression and TX
EQ.  Those must be manually turned off when using SSB or ESSB.

All in all, my opinion is that DATA A is just more convenient to use
than either SSB or ESSB for data modes.  While SSB will work just fine
if the proper precautions are taken, DATA A mode makes it automatic. The
VFO is easy to move to get to those stations operating on the extreme
edges (or outside) the "normal" passband.

73,
Don W3FPR

On 5/1/2014 12:08 AM, David Box Comcast wrote:
> I am having a lot of fun learning as much as I can about the KX3 and really enjoy using it.  I have been playing with PSK-31 and using the Data mode with FlDigi.  The frequency range I am able to work is about 400Hz on low end due to receiver roll off and then the upper transmitter bandwidth is 2950Hz as the power rolls off sharply above this.  So I have set my waterfall in FlDigi to display 400 - 3000 Hz.
>
> That range works very well and making contacts but was thinking tonight if the ESSB mode would broaden the available frequency span.  Not a fan of ESSB on voice but are there any negatives in using to extend bandwidth on digital modes like PSK-31.  I'll probably run some tests tomorrow but wanted to query the vast experience base of this group and see if this had already been checked.
>
>

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[David Box Comcast]

Ran a couple of tests this morning and found that using ESSB only extends the transmit BW up to 3500Hz, so concurr that the ease of changing modes with DATA A far outweighs the slight change in BW and lots of buttons to push making sure EQ and comp etc are properly set if you don't use DATA A.

Don I think this just shows that Elecraft thought this through in setting up the basic ops.

73
Dave
K5MWR

Subject: Re: [Elecraft] KX3 Question about use of ESSB for Data Modes
Message-ID: <[hidden email]>
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Dave,

For several reasons I would advocate DATA A mode over SSB (or ESSB) for
data modes.
First, most data mode signals are contained within the 300 to 3000 Hz
range when the VFO is set at the 'recommended' data mode band frequency.
Secondly, it is easy to move the VFO knob to hear and decode signals
that are operating at the extreme edges of that bandwidth.
Thirdly, using DATA A mode automatically turns off compression and TX
EQ.  Those must be manually turned off when using SSB or ESSB.

All in all, my opinion is that DATA A is just more convenient to use
than either SSB or ESSB for data modes.  While SSB will work just fine
if the proper precautions are taken, DATA A mode makes it automatic. The
VFO is easy to move to get to those stations operating on the extreme
edges (or outside) the "normal" passband.

73,
Don W3FPR

Sent from my iPad
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