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[KX3] DATA A v SSB maximum receiver bandwidth not as wide.

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GM4JJJ

[KX3] DATA A v SSB maximum receiver bandwidth not as wide.

Experimenting with the KX3 on WSJT FSK441 and JT65b I noticed looking at the spectral display of band noise that with the bandwidth widened fully out on DATA A Mode that even though it was displaying 4 KHz on the KX3 LCD, the bandwidth of the audio was less, like 400 Hz to 3600 Hz.

On SSB mode it was possible to get the full 4 KHz by suitable manipulation of the width and centre frequency.

It is useful on JT65 on EME if you are running a pileup from a rare DXCC to have stations spread out and having the full 4 KHz is beneficial then. Under normal circumstances not at all important, but I was just curious why DATA A mode is not giving the full 4 KHz while the SSB mode is.

If I am missing some setting that is causing this please enlighten me.

(I prefer using DATA A to the SSB Mode on WSJT as it does things like turn off TX equalisation and compression and other things like NR on RX which might upset WSJT).

73

David Anderson GM4JJJ
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gm3sek

Re: [KX3] DATA A v SSB maximum receiver bandwidth not as wide.

This links into another problem about data bandwidths: unlike the
specific DATA sub-mode, the associated passband settings are not saved
per-band.

Whenever you select DATA, the stored SHIFT and WIDTH settings will
always be the last settings that were used for *any* data sub-mode on
*any* other band... which may often be quite inappropriate.

This is a particular inconvenience for all users who switch frequently
between narrowband data modes on HF and wider-band modes on 6m and
above.

(It obviously isn't a major problem; I only mention it in case Elecraft
might be revisiting this area of code.)

73 from Ian GM3SEK

>-----Original Message-----
>From: Elecraft [mailto:[hidden email]] On Behalf Of
>David Anderson
>Sent: 29 July 2015 22:28
>To: Elecraft Reflector
>Subject: [Elecraft] [KX3] DATA A v SSB maximum receiver bandwidth not
as
>wide.
>
>Experimenting with the KX3 on WSJT FSK441 and JT65b I noticed looking
at
>the spectral display of band noise that with the bandwidth widened
fully
>out on DATA A Mode that even though it was displaying 4 KHz on the KX3
>LCD, the bandwidth of the audio was less, like 400 Hz to 3600 Hz.
>
>On SSB mode it was possible to get the full 4 KHz by suitable
manipulation
>of the width and centre frequency.
>
>It is useful on JT65 on EME if you are running a pileup from a rare
DXCC to
>have stations spread out and having the full 4 KHz is beneficial then.
Under
>normal circumstances not at all important, but I was just curious why
DATA
>A mode is not giving the full 4 KHz while the SSB mode is.
>
>If I am missing some setting that is causing this please enlighten me.
>
>(I prefer using DATA A to the SSB Mode on WSJT as it does things like
turn
>off TX equalisation and compression and other things like NR on RX
which

>might upset WSJT).
>
>73
>
>David Anderson GM4JJJ
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
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Wes (N7WS)

Re: [KX3] DATA A v SSB maximum receiver bandwidth notas wide.

This inconvenience was brought up a long time ago.

Wayne said, "Filter bandwidth is stored per-mode. At present, all data sub-modes
share the same bandwidth. I'll look at what would be required to split them out."

July 5, 2010.

On 7/30/2015 1:13 AM, Ian White wrote:

> This links into another problem about data bandwidths: unlike the
> specific DATA sub-mode, the associated passband settings are not saved
> per-band.
>
> Whenever you select DATA, the stored SHIFT and WIDTH settings will
> always be the last settings that were used for *any* data sub-mode on
> *any* other band... which may often be quite inappropriate.
>
> This is a particular inconvenience for all users who switch frequently
> between narrowband data modes on HF and wider-band modes on 6m and
> above.
>
> (It obviously isn't a major problem; I only mention it in case Elecraft
> might be revisiting this area of code.)
>
>
> 73 from Ian GM3SEK
>
>

wayne burdick

Re: [KX3] DATA A v SSB maximum receiver bandwidth notas wide.

Administrator

I thought we'd hit the statute of limitations on this one. Thanks for the reminder.

tnx
Wayne
N6KR

On Jul 30, 2015, at 2:02 PM, Wes (N7WS) <[hidden email]> wrote:

> This inconvenience was brought up a long time ago.
>
> Wayne said, "Filter bandwidth is stored per-mode. At present, all data sub-modes share the same bandwidth. I'll look at what would be required to split them out."
>
> July 5, 2010.
>
>
>
>
> On 7/30/2015 1:13 AM, Ian White wrote:
>> This links into another problem about data bandwidths: unlike the
>> specific DATA sub-mode, the associated passband settings are not saved
>> per-band.
>>
>> Whenever you select DATA, the stored SHIFT and WIDTH settings will
>> always be the last settings that were used for *any* data sub-mode on
>> *any* other band... which may often be quite inappropriate.
>>
>> This is a particular inconvenience for all users who switch frequently
>> between narrowband data modes on HF and wider-band modes on 6m and
>> above.
>>
>> (It obviously isn't a major problem; I only mention it in case Elecraft
>> might be revisiting this area of code.)
>>
>>
>> 73 from Ian GM3SEK

Phil Wheeler-2

Re: [KX3] DATA A v SSB maximum receiver bandwidth notas wide.

There are NO statutes of limitations on this sort
of thing, Wayne :-)

73, Phil W7OX

On 7/30/15 3:24 PM, Wayne Burdick wrote:

> I thought we'd hit the statute of limitations on this one. Thanks for the reminder.
>
> tnx
> Wayne
> N6KR
>
>
> On Jul 30, 2015, at 2:02 PM, Wes (N7WS) <[hidden email]> wrote:
>
>> This inconvenience was brought up a long time ago.
>>
>> Wayne said, "Filter bandwidth is stored per-mode. At present, all data sub-modes share the same bandwidth. I'll look at what would be required to split them out."
>>
>> July 5, 2010.
>>
>>
>>
>>
>> On 7/30/2015 1:13 AM, Ian White wrote:
>>> This links into another problem about data bandwidths: unlike the
>>> specific DATA sub-mode, the associated passband settings are not saved
>>> per-band.
>>>
>>> Whenever you select DATA, the stored SHIFT and WIDTH settings will
>>> always be the last settings that were used for *any* data sub-mode on
>>> *any* other band... which may often be quite inappropriate.
>>>
>>> This is a particular inconvenience for all users who switch frequently
>>> between narrowband data modes on HF and wider-band modes on 6m and
>>> above.
>>>
>>> (It obviously isn't a major problem; I only mention it in case Elecraft
>>> might be revisiting this area of code.)
>>>
>>>
>>> 73 from Ian GM3SEK
>
>
> ______________________________________________________________
> 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]
>

GM4JJJ

Re: [KX3] DATA A v SSB maximum receiver bandwidth notas wide.

In reply to this post by wayne burdick

Any comment on my original question in this thread before it was hijacked hi, ( which was about the KX3 not the K3).

For reference here it is again.

Experimenting with the KX3 on WSJT FSK441 and JT65b I noticed looking at the spectral display of band noise that with the bandwidth widened fully out on DATA A Mode that even though it was displaying 4 KHz on the KX3 LCD, the bandwidth of the audio was less, like 400 Hz to 3600 Hz.

On SSB mode it was possible to get the full 4 KHz by suitable manipulation of the width and centre frequency.

It is useful on JT65 on EME if you are running a pileup from a rare DXCC to have stations spread out and having the full 4 KHz is beneficial then. Under normal circumstances not at all important, but I was just curious why DATA A mode is not giving the full 4 KHz while the SSB mode is.

If I am missing some setting that is causing this please enlighten me.

(I prefer using DATA A to the SSB Mode on WSJT as it does things like turn off TX equalisation and compression and other things like NR on RX which might upset WSJT).

73

David Anderson GM4JJJ

> On 30 Jul 2015, at 23:24, Wayne Burdick <[hidden email]> wrote:
>
> I thought we'd hit the statute of limitations on this one. Thanks for the reminder.
>
> tnx
> Wayne
> N6KR
>
>
>> On Jul 30, 2015, at 2:02 PM, Wes (N7WS) <[hidden email]> wrote:
>>
>> This inconvenience was brought up a long time ago.
>>
>> Wayne said, "Filter bandwidth is stored per-mode. At present, all data sub-modes share the same bandwidth. I'll look at what would be required to split them out."
>>
>> July 5, 2010.
>>
>>
>>
>>
>>> On 7/30/2015 1:13 AM, Ian White wrote:
>>> This links into another problem about data bandwidths: unlike the
>>> specific DATA sub-mode, the associated passband settings are not saved
>>> per-band.
>>>
>>> Whenever you select DATA, the stored SHIFT and WIDTH settings will
>>> always be the last settings that were used for *any* data sub-mode on
>>> *any* other band... which may often be quite inappropriate.
>>>
>>> This is a particular inconvenience for all users who switch frequently
>>> between narrowband data modes on HF and wider-band modes on 6m and
>>> above.
>>>
>>> (It obviously isn't a major problem; I only mention it in case Elecraft
>>> might be revisiting this area of code.)
>>>
>>>
>>> 73 from Ian GM3SEK
>
>
>
> ______________________________________________________________
> 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]

John Kramer

Re: [KX3] PX3 display not sensitive

I bought a new KX3 and PX3 factory built, 3 weeks ago. It is a great pair, but there are several
annoying things. The one thing that I have issue with is the very poor “sensitivity” of the PX3.
I have 59 plus 10 signals on my KX3, however, on the PX3 waterfall the trace is very faint and
indistinct. This is on a signal more than 20db above the noise floor !!!
I really hate to have to compare, but on my Flex radio’s, you can see signals on the waterfall display
that you can barely hear in the receiver. And when signals are reasonably strong, you can analyse
the signal to a good degree - you can see if the transmitting station is splattering, overdriving etc
With the PX3 the sensitivity is quite poor - with a strong signal you can barely see and analyse
the incoming audio. I have tried a number of settings, adjusting contrast etc but I can’t seem
to improve it, and guess it’s inherent in the firmware.
Am I missing something ? or can it be improved in a future firmware update ?

73
John, ZS5J C91J A25J
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vk2rq

Re: [KX3] PX3 display not sensitive

That doesn't sound normal. Three things to check:- in the KX3, do you have the RX I/Q set to Enabled- on page 16 of the PX3 manual, check the REF and SCALE settings- have you done the side and nulling procedure on page 26? Maybe the gain settings there are not sane.
73, Matt VK2RQ

On Fri, Jul 31, 2015 at 1:32 AM -0700, "John Kramer" <[hidden email]> wrote:

I bought a new KX3 and PX3 factory built, 3 weeks ago. It is a great pair, but there are several
annoying things. The one thing that I have issue with is the very poor “sensitivity” of the PX3.
I have 59 plus 10 signals on my KX3, however, on the PX3 waterfall the trace is very faint and
indistinct. This is on a signal more than 20db above the noise floor !!!
I really hate to have to compare, but on my Flex radio’s, you can see signals on the waterfall display
that you can barely hear in the receiver. And when signals are reasonably strong, you can analyse
the signal to a good degree - you can see if the transmitting station is splattering, overdriving etc
With the PX3 the sensitivity is quite poor - with a strong signal you can barely see and analyse
the incoming audio. I have tried a number of settings, adjusting contrast etc but I can’t seem
to improve it, and guess it’s inherent in the firmware.
Am I missing something ? or can it be improved in a future firmware update ?

73
John, ZS5J C91J A25J
______________________________________________________________
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vk2rq

Re: [KX3] DATA A v SSB maximum receiver bandwidth notas wide.

In reply to this post by GM4JJJ

What happens if you change the centre frequency before widening out the bandwidth?

73, Matt VK2RQ

On Fri, Jul 31, 2015 at 1:13 AM -0700, "David Anderson" <[hidden email]> wrote:

Any comment on my original question in this thread before it was hijacked hi, ( which was about the KX3 not the K3).

For reference here it is again.

Experimenting with the KX3 on WSJT FSK441 and JT65b I noticed looking at the spectral display of band noise that with the bandwidth widened fully out on DATA A Mode that even though it was displaying 4 KHz on the KX3 LCD, the bandwidth of the audio was less, like 400 Hz to 3600 Hz.

On SSB mode it was possible to get the full 4 KHz by suitable manipulation of the width and centre frequency.

It is useful on JT65 on EME if you are running a pileup from a rare DXCC to have stations spread out and having the full 4 KHz is beneficial then. Under normal circumstances not at all important, but I was just curious why DATA A mode is not giving the full 4 KHz while the SSB mode is.

If I am missing some setting that is causing this please enlighten me.

(I prefer using DATA A to the SSB Mode on WSJT as it does things like turn off TX equalisation and compression and other things like NR on RX which might upset WSJT).

73

David Anderson GM4JJJ

> On 30 Jul 2015, at 23:24, Wayne Burdick wrote:
>
> I thought we'd hit the statute of limitations on this one. Thanks for the reminder.
>
> tnx
> Wayne
> N6KR
>
>
>> On Jul 30, 2015, at 2:02 PM, Wes (N7WS) wrote:
>>
>> This inconvenience was brought up a long time ago.
>>
>> Wayne said, "Filter bandwidth is stored per-mode. At present, all data sub-modes share the same bandwidth. I'll look at what would be required to split them out."
>>
>> July 5, 2010.
>>
>>
>>
>>
>>> On 7/30/2015 1:13 AM, Ian White wrote:
>>> This links into another problem about data bandwidths: unlike the
>>> specific DATA sub-mode, the associated passband settings are not saved
>>> per-band.
>>>
>>> Whenever you select DATA, the stored SHIFT and WIDTH settings will
>>> always be the last settings that were used for *any* data sub-mode on
>>> *any* other band... which may often be quite inappropriate.
>>>
>>> This is a particular inconvenience for all users who switch frequently
>>> between narrowband data modes on HF and wider-band modes on 6m and
>>> above.
>>>
>>> (It obviously isn't a major problem; I only mention it in case Elecraft
>>> might be revisiting this area of code.)
>>>
>>>
>>> 73 from Ian GM3SEK
>
>
>
> ______________________________________________________________
> 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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John Kramer

Re: [KX3] PX3 display not sensitive

In reply to this post by vk2rq

Matt

Thanks for your response, really appreciate it.

1. Yes, the RX IQ is enabled - I think if it wasn’t enabled I wouldn’t see anything on the PX3.
It is working normally, it’s just that the trace left on the waterfall is extremely faint for a signal
that is 20 - 30 db above the noise floor. The Flex and PSDR will show a clear trace at close
to the noise level or just a few db above it. Maybe I am expecting too much from what is
essentially a portable radio and portable panadapter.
2. Yes, I have fiddled with the REF and SCALE, but can’t improve on the factory settings.
I can bring up the sensitivity, but that introduces noise on the waterfall, and the wanted signal
is now buried in the noise on the waterfall.
3. No, I haven’t tried the side nulling procedure. Having bought the KX3 and PX3 factory built,
I would have thought it would have been done prior to shipping ? But I don’t see images or
anything like that which would point to this being a problem. It appears pretty well
balanced. I don’t have an XG3 to calibrate, but might try using the built-in generator in the PX3

Thanks again for the reply, and have a good weekend

73
John, ZS5J C91J A25J

On 31 Jul 2015, at 11:25 AM, Matt Maguire <[hidden email]> wrote:

That doesn't sound normal. Three things to check:
- in the KX3, do you have the RX I/Q set to Enabled
- on page 16 of the PX3 manual, check the REF and SCALE settings
- have you done the side and nulling procedure on page 26? Maybe the gain settings there are not sane.

73, Matt VK2RQ <x-apple-data-detectors://0>

On Fri, Jul 31, 2015 at 1:32 AM -0700, "John Kramer" <[hidden email] <mailto:[hidden email]>> wrote:

I bought a new KX3 and PX3 factory built, 3 weeks ago. It is a great pair, but there are several
annoying things. The one thing that I have issue with is the very poor “sensitivity” of the PX3.
I have 59 plus 10 signals on my KX3, however, on the PX3 waterfall the trace is very faint and
indistinct. This is on a signal more than 20db above the noise floor !!!
I really hate to have to compare, but on my Flex radio’s, you can see signals on the waterfall display
that you can barely hear in the receiver. And when signals are reasonably strong, you can analyse
the signal to a good degree - you can see if the transmitting station is splattering, overdriving etc
With the PX3 the sensitivity is quite poor - with a strong signal you can barely see and analyse
the incoming audio. I have tried a number of settings, adjusting contrast etc but I can’t seem
to improve it, and guess it’s inherent in the firmware.
Am I missing something ? or can it be improved in a future firmware update ?

73
John, ZS5J C91J A25J
______________________________________________________________
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vk2rq

Re: [KX3] PX3 display not sensitive

Another thing to try is the noise blanker in the PX3. At the moment I have an arcing power pole down the road from my place spewing out lots of garbage on the air, which can be seen on the PX3. If I enable the PX3's noise blanker, it really cleans up the display and lets me see the underlying signals much more clearly.

73, Matt VK2RQ

On Fri, Jul 31, 2015 at 4:06 AM -0700, "John Kramer" <[hidden email]> wrote:

Matt
Thanks for your response, really appreciate it.
1. Yes, the RX IQ is enabled - I think if it wasn’t enabled I wouldn’t see anything on the PX3.It is working normally, it’s just that the trace left on the waterfall is extremely faint for a signalthat is 20 - 30 db above the noise floor. The Flex and PSDR will show a clear trace at close to the noise level or just a few db above it. Maybe I am expecting too much from what isessentially a portable radio and portable panadapter.2. Yes, I have fiddled with the REF and SCALE, but can’t improve on the factory settings. I can bring up the sensitivity, but that introduces noise on the waterfall, and the wanted signalis now buried in the noise on the waterfall.3. No, I haven’t tried the side nulling procedure. Having bought the KX3 and PX3 factory built,I would have thought it would have been done prior to shipping ? But I don’t see images oranything like that which would point to this being a problem. It appears pretty wellbalanced. I don’t have an XG3 to calibrate, but might try using the built-in generator in the PX3
Thanks again for the reply, and have a good weekend
73John, ZS5J C91J A25J

On 31 Jul 2015, at 11:25 AM, Matt Maguire <[hidden email]> wrote:
That doesn't sound normal. Three things to check:- in the KX3, do you have the RX I/Q set to Enabled- on page 16 of the PX3 manual, check the REF and SCALE settings- have you done the side and nulling procedure on page 26? Maybe the gain settings there are not sane.
73, Matt VK2RQ

On Fri, Jul 31, 2015 at 1:32 AM -0700, "John Kramer" <[hidden email]> wrote:

I bought a new KX3 and PX3 factory built, 3 weeks ago. It is a great pair, but there are several
annoying things. The one thing that I have issue with is the very poor “sensitivity” of the PX3.
I have 59 plus 10 signals on my KX3, however, on the PX3 waterfall the trace is very faint and
indistinct. This is on a signal more than 20db above the noise floor !!!
I really hate to have to compare, but on my Flex radio’s, you can see signals on the waterfall display
that you can barely hear in the receiver. And when signals are reasonably strong, you can analyse
the signal to a good degree - you can see if the transmitting station is splattering, overdriving etc
With the PX3 the sensitivity is quite poor - with a strong signal you can barely see and analyse
the incoming audio. I have tried a number of settings, adjusting contrast etc but I can’t seem
to improve it, and guess it’s inherent in the firmware.
Am I missing something ? or can it be improved in a future firmware update ?

73
John, ZS5J C91J A25J
______________________________________________________________
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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GM4JJJ

Re: [KX3] DATA A v SSB maximum receiver bandwidth notas wide.

In reply to this post by vk2rq

I have been doing that, still don't get 4KHz bandwidth. I would just accept it as a limitation of the receiver if it weren't for the fact that on SSB I can widen the pass out to 4KHz.

So in summary, why can't DATA A be as wide as SSB mode?

73

David Anderson GM4JJJ

> On 31 Jul 2015, at 10:34, Matt Maguire <[hidden email]> wrote:
>
> What happens if you change the centre frequency before widening out the bandwidth?
>
> 73, Matt VK2RQ
>

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GM4JJJ

Re: [KX3] PX3 display not sensitive

In reply to this post by vk2rq

Beware the noise blanker can introduce a lot of false products with strong signals. For example on 144 MHz I have the PX3 NB on and it does cut out display of powerline noise, but as soon as a strong signal appears on the band the noise level bounces up and down way beyond the actual signal. So it is a balancing act like so many things.

I don't have a problem with the sensitivity of the waterfall here, I will say the viewing angle is a big narrow and I do lose sight of the waterfall when not viewing it straight on sometimes.

Perhaps you could post a photo or video of the problem you are seeing John.

73

David Anderson GM4JJJ

> On 31 Jul 2015, at 12:29, Matt Maguire <[hidden email]> wrote:
>
> Another thing to try is the noise blanker in the PX3. At the moment I have an arcing power pole down the road from my place spewing out lots of garbage on the air, which can be seen on the PX3. If I enable the PX3's noise blanker, it really cleans up the display and lets me see the underlying signals much more clearly.
>
> 73, Matt VK2RQ
>
>
>
>
> On Fri, Jul 31, 2015 at 4:06 AM -0700, "John Kramer" <[hidden email]> wrote:
>
>
>
>
>
>
>
>
>
>
> Matt
> Thanks for your response, really appreciate it.
> 1. Yes, the RX IQ is enabled - I think if it wasn’t enabled I wouldn’t see anything on the PX3.It is working normally, it’s just that the trace left on the waterfall is extremely faint for a signalthat is 20 - 30 db above the noise floor. The Flex and PSDR will show a clear trace at close to the noise level or just a few db above it. Maybe I am expecting too much from what isessentially a portable radio and portable panadapter.2. Yes, I have fiddled with the REF and SCALE, but can’t improve on the factory settings. I can bring up the sensitivity, but that introduces noise on the waterfall, and the wanted signalis now buried in the noise on the waterfall.3. No, I haven’t tried the side nulling procedure. Having bought the KX3 and PX3 factory built,I would have thought it would have been done prior to shipping ? But I don’t see images oranything like that which would point to this being a problem. It appears pretty wellbalanced. I don’t have an XG3 to calibrate, but might try using the built-in generator in the PX3
> Thanks again for the reply, and have a good weekend
> 73John, ZS5J C91J A25J
>
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>
> On 31 Jul 2015, at 11:25 AM, Matt Maguire <[hidden email]> wrote:
> That doesn't sound normal. Three things to check:- in the KX3, do you have the RX I/Q set to Enabled- on page 16 of the PX3 manual, check the REF and SCALE settings- have you done the side and nulling procedure on page 26? Maybe the gain settings there are not sane.
> 73, Matt VK2RQ
>
>
>
>
> On Fri, Jul 31, 2015 at 1:32 AM -0700, "John Kramer" <[hidden email]> wrote:
>
>
>
>
>
>
>
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>
> I bought a new KX3 and PX3 factory built, 3 weeks ago. It is a great pair, but there are several
> annoying things. The one thing that I have issue with is the very poor “sensitivity” of the PX3.
> I have 59 plus 10 signals on my KX3, however, on the PX3 waterfall the trace is very faint and
> indistinct. This is on a signal more than 20db above the noise floor !!!
> I really hate to have to compare, but on my Flex radio’s, you can see signals on the waterfall display
> that you can barely hear in the receiver. And when signals are reasonably strong, you can analyse
> the signal to a good degree - you can see if the transmitting station is splattering, overdriving etc
> With the PX3 the sensitivity is quite poor - with a strong signal you can barely see and analyse
> the incoming audio. I have tried a number of settings, adjusting contrast etc but I can’t seem
> to improve it, and guess it’s inherent in the firmware.
> Am I missing something ? or can it be improved in a future firmware update ?
>
> 73
> John, ZS5J C91J A25J
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GM4JJJ

Re: [KX3] DATA A v SSB maximum receiver bandwidth not as wide.

In reply to this post by GM4JJJ

No reply from Elecraft on this matter received so far.

So you don't have to read through the details, it is a simple question:

Why can the RX bandwidth not be made as wide on DATA A mode as it can on SSB mode?

If it can be made to widen out as far let me know what I am missing please.

The LCD on the KX3 shows 4 kHz width but it isn't giving 4 kHz width when viewing the audio (band noise) on WSJT. (It goes from 400Hz at the LF end to 3600 Hz at the HF end). On SSB by manipulation of centre frequency and width controls it is possible to widen up to 4 kHz (200-4200Hz), but not on DATA A which is what I prefer to use for data modes.

So is this a feature or a bug?

73

David Anderson GM4JJJ

> On 31 Jul 2015, at 14:00, David Anderson <[hidden email]> wrote:
>
> I have been doing that, still don't get 4KHz bandwidth. I would just accept it as a limitation of the receiver if it weren't for the fact that on SSB I can widen the pass out to 4KHz.
>
> So in summary, why can't DATA A be as wide as SSB mode?
>
> 73
>
> David Anderson GM4JJJ
>
>> On 31 Jul 2015, at 10:34, Matt Maguire <[hidden email]> wrote:
>>
>> What happens if you change the centre frequency before widening out the bandwidth?
>>
>> 73, Matt VK2RQ
>
>
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>
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