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Data mode and filters

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KV6O

Data mode and filters

I have searched, and can't find a definitive answer on this.

I am running a lot of JT9 and JT65 these days, and the DATA-A mode seems to be limited to 4k max. I have the 6k, 2.8k, 1.8k and a 250Hz, all 8-pole filters installed. The 6k filter is selected in the the config utility to be avail in data mode, but I can never widen up the passband beyond 4k.

Am I doing something wrong?

Thanks!

Steve
KV6O

Joe Subich, W4TV-4

Re: Data mode and filters

> Am I doing something wrong?

No, the audio DSP has a maximum audio frequency of 4200 Hz. The
widest bandwidth you will see in SSB or DATA A is 4 KHz (200 - 4200
Hz).

73,

... Joe, W4TV

On 2015-05-05 10:44 PM, KV6O wrote:

> I have searched, and can't find a definitive answer on this.
>
> I am running a lot of JT9 and JT65 these days, and the DATA-A mode seems to
> be limited to 4k max. I have the 6k, 2.8k, 1.8k and a 250Hz, all 8-pole
> filters installed. The 6k filter is selected in the the config utility to
> be avail in data mode, but I can never widen up the passband beyond 4k.
>
> Am I doing something wrong?
>
> Thanks!
>
> Steve
> KV6O
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Data-mode-and-filters-tp7602196.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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>

KV6O

Re: Data mode and filters

Huh. Is there anyway around this? I use data modes way more than AM, sure would be nice to be able to get the 6k filter to work! Don't need DSP for these modes....

Thanks,

Steve
KV6O

Jim Brown-10

Re: Data mode and filters

I can't think of a good reason - everyone else is stuck with 2.8-4 kHz
bandwidth, all the activity is pretty much within 2.8 kHz bandwidth, so
you would be talking to yourself. :)

73, Jim K9YC

On Tue,5/5/2015 8:30 PM, KV6O wrote:

> Huh. Is there anyway around this? I use data modes way more than AM, sure
> would be nice to be able to get the 6k filter to work! Don't need DSP for
> these modes....
>
> Thanks,
>
> Steve
> KV6O
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Data-mode-and-filters-tp7602196p7602199.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
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>

Joe Subich, W4TV-4

Re: Data mode and filters

In reply to this post by KV6O

On 2015-05-05 11:30 PM, KV6O wrote:
> Huh. Is there anyway around this?

No, the DSP is used for demodulation (15 KHz final IF to audio).

The 6 KHz bandwidth is generally used for AM where 6 KHz at RF
represents 3 KHz at audio (AM RF bandwidth = 2 x AF bandwidth).

The 4.2 KHz maximum "HI" frequency is based on the design of
the digital to analog converter and a decision that 4000 to
4500 Hz is the highest frequency required for communications
quality audio. The K3 is not and was never deigned to be a high
fidelity receiver.

73,

... Joe, W4TV

On 2015-05-05 11:30 PM, KV6O wrote:

Ross Primrose

Re: Data mode and filters

In reply to this post by Jim Brown-10

Yeah. you're right. No one could ever possibly want to listen to the
PSK and JT portions of the band at the same time. And, of course, no
one uses SDRs for digital modes either ;)

73, Ross N4RP

On 5/6/2015 12:07 AM, Jim Brown wrote:

> I can't think of a good reason - everyone else is stuck with 2.8-4 kHz
> bandwidth, all the activity is pretty much within 2.8 kHz bandwidth,
> so you would be talking to yourself. :)
>
> 73, Jim K9YC
>
> On Tue,5/5/2015 8:30 PM, KV6O wrote:
>> Huh. Is there anyway around this? I use data modes way more than
>> AM, sure
>> would be nice to be able to get the 6k filter to work! Don't need
>> DSP for
>> these modes....
>>
>> Thanks,
>>
>> Steve
>> KV6O
>>
>>
>>
>> --
>> View this message in context:
>> http://elecraft.365791.n2.nabble.com/Data-mode-and-filters-tp7602196p7602199.html
>> Sent from the Elecraft mailing list archive at Nabble.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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Robert .

Re: Data mode and filters

In reply to this post by Jim Brown-10

Jim & group

is there any tutorial for JT65?

I'm decoding OK but transmit (K3) have not worked out yet.....

73 Robert W5AJ

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Jim
Brown
Sent: Tuesday, May 05, 2015 11:08 PM
To: [hidden email]
Subject: Re: [Elecraft] Data mode and filters

I can't think of a good reason - everyone else is stuck with 2.8-4 kHz
bandwidth, all the activity is pretty much within 2.8 kHz bandwidth, so you
would be talking to yourself. :)

73, Jim K9YC

On Tue,5/5/2015 8:30 PM, KV6O wrote:

> Huh. Is there anyway around this? I use data modes way more than AM,
> sure would be nice to be able to get the 6k filter to work! Don't
> need DSP for these modes....
>
> Thanks,
>
> Steve
> KV6O
>
>
>
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/Data-mode-and-filters-tp7602196p7
> 602199.html Sent from the Elecraft mailing list archive at Nabble.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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Paul Maciel-2

Re: Data mode and filters

Hello Robert,

Check out the NW7US web page <nw7us/jt65a.html> especially the links to the articles written by Dave W6DTW.

---Paul AK1P

Sent from my iPhone

> On May 6, 2015, at 9:55 AM, Robert Wood <[hidden email]> wrote:
>
> Jim & group
>
> is there any tutorial for JT65?
>
> I'm decoding OK but transmit (K3) have not worked out yet.....
>
> 73 Robert W5AJ
>
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Jim
> Brown
> Sent: Tuesday, May 05, 2015 11:08 PM
> To: [hidden email]
> Subject: Re: [Elecraft] Data mode and filters
>
> I can't think of a good reason - everyone else is stuck with 2.8-4 kHz
> bandwidth, all the activity is pretty much within 2.8 kHz bandwidth, so you
> would be talking to yourself. :)
>
> 73, Jim K9YC
>
>> On Tue,5/5/2015 8:30 PM, KV6O wrote:
>> Huh. Is there anyway around this? I use data modes way more than AM,
>> sure would be nice to be able to get the 6k filter to work! Don't
>> need DSP for these modes....
>>
>> Thanks,
>>
>> Steve
>> KV6O
>>
>>
>>
>> --
>> View this message in context:
>> http://elecraft.365791.n2.nabble.com/Data-mode-and-filters-tp7602196p7
>> 602199.html Sent from the Elecraft mailing list archive at Nabble.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]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
> ______________________________________________________________
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>
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Jim Brown-10

Re: Data mode and filters

In reply to this post by Robert .

On Wed,5/6/2015 6:55 AM, Robert Wood wrote:
> is there any tutorial for JT65?

Yes. Study the documentation that comes with WSJT and WSJT-X.

As far as interface to the K3 is concerned, it's just like PSK or any
other digital mode. The best software to use is WSJT-X.

73, Jim K9YC
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NK7Z

Re: Data mode and filters

In reply to this post by Joe Subich, W4TV-4

But Joe... There is an ESSB on and off control... :)

Sorry, I hate ESSB and had too..
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

On Wed, 2015-05-06 at 09:43 -0400, Joe Subich, W4TV wrote:

> On 2015-05-05 11:30 PM, KV6O wrote:
> > Huh. Is there anyway around this?
>
> No, the DSP is used for demodulation (15 KHz final IF to audio).
>
> The 6 KHz bandwidth is generally used for AM where 6 KHz at RF
> represents 3 KHz at audio (AM RF bandwidth = 2 x AF bandwidth).
>
> The 4.2 KHz maximum "HI" frequency is based on the design of
> the digital to analog converter and a decision that 4000 to
> 4500 Hz is the highest frequency required for communications
> quality audio. The K3 is not and was never deigned to be a high
> fidelity receiver.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 2015-05-05 11:30 PM, KV6O wrote:
> > Huh. Is there anyway around this? I use data modes way more than AM, sure
> > would be nice to be able to get the 6k filter to work! Don't need DSP for
> > these modes....
> >
> > Thanks,
> >
> > Steve
> > KV6O
> >
> >
> >
> > --
> > View this message in context: http://elecraft.365791.n2.nabble.com/Data-mode-and-filters-tp7602196p7602199.html
> > Sent from the Elecraft mailing list archive at Nabble.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]
> >
> ______________________________________________________________
> 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

Re: Data mode and filters

In reply to this post by Ross Primrose

If you are trying to listen to 2 sections at once you may want to look into the dual watch feature

In my K3 I have done that with the sub-receiver, putting one portion on the left and the other on the right.

From: Ross Primrose <[hidden email]>
To: [hidden email]; [hidden email]
Sent: Wednesday, May 6, 2015 9:46 AM
Subject: Re: [Elecraft] Data mode and filters

Yeah. you're right. No one could ever possibly want to listen to the
PSK and JT portions of the band at the same time. And, of course, no
one uses SDRs for digital modes either ;)

73, Ross N4RP

On 5/6/2015 12:07 AM, Jim Brown wrote:

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

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Joe Subich, W4TV-4

Re: Data mode and filters

In reply to this post by NK7Z

On 2015-05-06 12:41 PM, David Cole wrote:
> But Joe... There is an ESSB on and off control... :)

Correct and ESSB in the K3 is a maximum of 4 KHz wide for
those who feel the need to act like children and generate
wider than normal QRM.

73,

... Joe, W4TV

On 2015-05-06 12:41 PM, David Cole wrote:
> But Joe... There is an ESSB on and off control... :)
>
> Sorry, I hate ESSB and had too..
>
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Elecraft mailing list

Re: Data mode and filters

By that thought we should all be using 1.8 KHz Filters on TX and RTTY should be scrapped in favor of PSK31.

I have no problem with ESSB, what I do have a problem with is those intentionally snuggling up close to them to cause QRM when the rest of the band is wide open.

As licensed Amateurs, we should realize that we share the bands with others.
Our interest may not be the same as theirs but we should have enough common decency as to not act in a way as to spoil the enjoyment of those we share the bands with.

From: "Joe Subich, W4TV" <[hidden email]>
To: [hidden email]
Sent: Wednesday, May 6, 2015 1:55 PM
Subject: Re: [Elecraft] Data mode and filters

On 2015-05-06 12:41 PM, David Cole wrote:
> But Joe... There is an ESSB on and off control... :)

Correct and ESSB in the K3 is a maximum of 4 KHz wide for
those who feel the need to act like children and generate
wider than normal QRM.

73,

... Joe, W4TV

On 2015-05-06 12:41 PM, David Cole wrote:
> But Joe... There is an ESSB on and off control... :)
>
> Sorry, I hate ESSB and had too..
>
______________________________________________________________
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Joe Subich, W4TV-4

Re: Data mode and filters

On 2015-05-07 8:30 AM, Harry Yingst via Elecraft wrote:
> By that thought we should all be using 1.8 KHz Filters on TX

ITU and by extension the FCC which incorporates the particular
definitions in Part 1 of the regulations, defines communications
quality audio as 2.7KHz (300 Hz to 3 KHz). I'm happy to leave
the definitions and regulations to them. I'm not happy with
the lids who are passing DC to 5 KHz in busy (crowded) bands
and running that through amplifiers with high levels of IMD.

73,

... Joe, W4TV

On 2015-05-07 8:30 AM, Harry Yingst via Elecraft wrote:

> By that thought we should all be using 1.8 KHz Filters on TX and RTTY should be scrapped in favor of PSK31.
>
>
> I have no problem with ESSB, what I do have a problem with is those intentionally snuggling up close to them to cause QRM when the rest of the band is wide open.
>
> As licensed Amateurs, we should realize that we share the bands with others.
> Our interest may not be the same as theirs but we should have enough common decency as to not act in a way as to spoil the enjoyment of those we share the bands with.
>
>
>
>
>
>
>
>
>
>
> From: "Joe Subich, W4TV" <[hidden email]>
> To: [hidden email]
> Sent: Wednesday, May 6, 2015 1:55 PM
> Subject: Re: [Elecraft] Data mode and filters
>
>
> On 2015-05-06 12:41 PM, David Cole wrote:
> > But Joe... There is an ESSB on and off control... :)
>
> Correct and ESSB in the K3 is a maximum of 4 KHz wide for
> those who feel the need to act like children and generate
> wider than normal QRM.
>
> 73,
>
> ... Joe, W4TV
>
>
>
>
> On 2015-05-06 12:41 PM, David Cole wrote:
>> But Joe... There is an ESSB on and off control... :)
>>
>> Sorry, I hate ESSB and had too..
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> 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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>
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>