KDSP2 Turns Back On On Power-up?

[Jeff-229]

Hi gang,

I must have overlooked something in the KDSP2 manual.  When I set the KDSP2 in my K2 to bypass, the next time I turn on the rig the KDSP2 is back on; it is no longer in bypass mode.  How do I make the KDSP2 stay turned off through power-down and power-up?

Thanks & 73,
Jeff
NE2J (formerly WB5GWB)
Long Island, NY
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[KK7P]

> I must have overlooked something in the KDSP2 manual.  When I set the KDSP2 in my K2 to bypass, the next time I turn on the rig the KDSP2 is back on; it is no longer in bypass mode.  How do I make the KDSP2 stay turned off through power-down and power-up?

On power-up, the KDSP2 is always on.  The bypass mode is not "sticky."

73,

Lyle KK7P

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[Jeff-229]

The KDSP2 DSP filter for the K2 works great, in my opinion, but I wonder if
it would be possible in a future KDSP2 firmware revision to implement some
or all of the following three suggestions, which would increase my CW
operating convenience:

1.  Reduce the number of button presses necessary to put the KDSP2 into
bypass mode (turn it off).  Currently, it takes a button tap, two button
holds, and one more tap to turn it off, if you just turned on the rig, and
two button taps to turn it back on.  I find that the two button holds are
the most time-consuming and bothersome parts of the process, so my
suggestion is that the number of button presses to turn off the KDSP2 could
be reduced to two taps and no holds by making the "dSP On / bYP" menu entry
*always* come up first when the DSP menu is accessed.

2.  Make the KDSP2 remember whether or not it is in bypass (off) mode, so
that its state would not change when power is turned off and on.  That is,
the KDSP2 would not have to always be on on power-up.

3.  Make the KDSP2 remember the currently selected DSP filter (CF1, CF2,
CF3, or CF4), so that the same filter would stay in effect when power is
turned off and on.  Currently, the rig seems to remember the selected
crystal filter, but not the selected DSP filter, when power is cycled off
and on.

I like to put the KDSP2 in bypass mode when tuning around the band in order
to have a wider passband, so I can hear what's going on around me.  It
appears that the maximum bandwidth of the KDSP2 in CW mode is 800 Hz, which
is too narrow for my taste when tuning around.  Once I stop tuning and focus
on a particular signal, I often turn the KDSP2 back on to eliminate QRM.
This habit results in my having to do a lot of button pressing to turn the
KDSP2 off and on repeatedly.  Also, when I turn the rig on, I'm initially
turning around, so I want the KDSP2 to start out in bypass mode, but it
defaults to on, even if I had it off when I last used the rig.

Another advantage of being able to easily keep the KDSP2 turned off is that
having it off reduces power consumption.  When operating portable from the
internal battery, I would like to be able to make the KDSP2 stay off until I
return home, rather than having to turn it off each time I power-up.

As an alternative to suggestion (1), above, a slightly different setup that
would make me happy would be the addition of a fifth state, bypass, when the
K2's AFIL button is held repeatedly.  That is, after cycling through the
four DSP filters (CF1-CF4), the fifth setting would be bypass mode, in which
the KDSP2 would be turned off, and next would be CF1 again, and so forth.

Another alternative to suggestion (1) would be to increase the maximum DSP
bandwidth in the CW mode to equal the maximum bandwidth of the crystal
filters (2.49 kHz, I think).  If one of the four DSP filters could be set to
a very wide bandwidth, then invoking this filter would have approximately
the same effect as turning the KDSP2 off (except that it wouldn't decrease
power consumption).

Do others agree that some of my suggestions would be improvements or are you
happy with the KDSP2 just as it is?  Please let Lyle, KK7P, know your
preferences, as I believe he is the KDSP2's designer, and please let me know
too.

Thanks for listening to my ruminations, 73 & 72,
Jeff
NE2J (formerly WB5GWB)
Long Island, NY

----- Original Message -----
From: "Lyle Johnson" <[hidden email]>
To: "Jeff" <[hidden email]>
Cc: <[hidden email]>
Sent: Friday, May 04, 2007 10:12 PM
Subject: Re: [Elecraft] KDSP2 Turns Back On On Power-up?

>> I must have overlooked something in the KDSP2 manual.  When I set the
>> KDSP2 in my K2 to bypass, the next time I turn on the rig the KDSP2 is
>> back on; it is no longer in bypass mode.  How do I make the KDSP2 stay
>> turned off through power-down and power-up?
>
> On power-up, the KDSP2 is always on.  The bypass mode is not "sticky."
>
> 73,
>
> Lyle KK7P

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[Kenneth Moorman]

I agree with Jeff that the KDSP2 is awkward to use.  I will admit that it is
my first and only experience with a DSP, so maybe this "comes with the
territory".  I tend to just leave mine on all the time, as I haven't
committed the button push cycle to memory yet.  It would be nice to have
"Bypass" cycle with the DSP bandwidths as Jeff has proposed.

Ken, NU4I

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Jeff
Sent: Wednesday, June 06, 2007 8:37 AM
To: Lyle Johnson; [hidden email]
Subject: [Elecraft] Suggestions for KDSP2 Firmware Revisions

The KDSP2 DSP filter for the K2 works great, in my opinion, but I wonder if
it would be possible in a future KDSP2 firmware revision to implement some
or all of the following three suggestions, which would increase my CW
operating convenience:

1.  Reduce the number of button presses necessary to put the KDSP2 into
bypass mode (turn it off).  Currently, it takes a button tap, two button
holds, and one more tap to turn it off, if you just turned on the rig, and
two button taps to turn it back on.  I find that the two button holds are
the most time-consuming and bothersome parts of the process, so my
suggestion is that the number of button presses to turn off the KDSP2 could
be reduced to two taps and no holds by making the "dSP On / bYP" menu entry
*always* come up first when the DSP menu is accessed.

2.  Make the KDSP2 remember whether or not it is in bypass (off) mode, so
that its state would not change when power is turned off and on.  That is,
the KDSP2 would not have to always be on on power-up.

3.  Make the KDSP2 remember the currently selected DSP filter (CF1, CF2,
CF3, or CF4), so that the same filter would stay in effect when power is
turned off and on.  Currently, the rig seems to remember the selected
crystal filter, but not the selected DSP filter, when power is cycled off
and on.

I like to put the KDSP2 in bypass mode when tuning around the band in order
to have a wider passband, so I can hear what's going on around me.  It
appears that the maximum bandwidth of the KDSP2 in CW mode is 800 Hz, which
is too narrow for my taste when tuning around.  Once I stop tuning and focus

on a particular signal, I often turn the KDSP2 back on to eliminate QRM.
This habit results in my having to do a lot of button pressing to turn the
KDSP2 off and on repeatedly.  Also, when I turn the rig on, I'm initially
turning around, so I want the KDSP2 to start out in bypass mode, but it
defaults to on, even if I had it off when I last used the rig.

Another advantage of being able to easily keep the KDSP2 turned off is that
having it off reduces power consumption.  When operating portable from the
internal battery, I would like to be able to make the KDSP2 stay off until I

return home, rather than having to turn it off each time I power-up.

As an alternative to suggestion (1), above, a slightly different setup that
would make me happy would be the addition of a fifth state, bypass, when the

K2's AFIL button is held repeatedly.  That is, after cycling through the
four DSP filters (CF1-CF4), the fifth setting would be bypass mode, in which

the KDSP2 would be turned off, and next would be CF1 again, and so forth.

Another alternative to suggestion (1) would be to increase the maximum DSP
bandwidth in the CW mode to equal the maximum bandwidth of the crystal
filters (2.49 kHz, I think).  If one of the four DSP filters could be set to

a very wide bandwidth, then invoking this filter would have approximately
the same effect as turning the KDSP2 off (except that it wouldn't decrease
power consumption).

Do others agree that some of my suggestions would be improvements or are you

happy with the KDSP2 just as it is?  Please let Lyle, KK7P, know your
preferences, as I believe he is the KDSP2's designer, and please let me know

too.

Thanks for listening to my ruminations, 73 & 72,
Jeff
NE2J (formerly WB5GWB)
Long Island, NY


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[Don Wilhelm-3]

Jeff,

I agree with you, BUT the limitations are not in the DSP firmware but in
the K2 itself - there is just not adequate space in the K2 firmware menu
system to add those things that would make the DSP much easier to use.

73,
Don W3FPR

Jeff wrote:
> The KDSP2 DSP filter for the K2 works great, in my opinion, but I wonder
> if it would be possible in a future KDSP2 firmware revision to implement
> some or all of the following three suggestions, which would increase my
> CW operating convenience:
> ...
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[Randy Rathbun NV0U]

As Don said, there is no more room left, but... I don't like this
option either! I would personally rather have it be part of the filter
selection. So, throw another step in the mix: filter 1, 2, 3, 4, then
Off. Maybe that is not even possible to do that way even if there was
enough space left.

I figure that would kill two birds - it's status gets stored when the
rig is powered down AND it makes it easy to get to.

On 6/6/07, Jeff <[hidden email]> wrote:
> The KDSP2 DSP filter for the K2 works great, in my opinion, but I wonder if
> it would be possible in a future KDSP2 firmware revision to implement some
> or all of the following three suggestions, which would increase my CW
> operating convenience:
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[Don Wilhelm-3]

Now that you mention the OFF (bypass) condition being one of the filter
'width' selections, I believe that is done in the KDSP2 firmware and may
just be possible - it does not alleviate accessibility problems to the
separate DSP menus, but it may be a help.

The existing LoPass filter selection may be a suitable alternative
selection for use with a wide CW IF filter.  I have not used the DSP
here, but I do have one coming that I can play with a bit.

73,
Don W3FPR

Randy NV0U wrote:
> As Don said, there is no more room left, but... I don't like this
> option either! I would personally rather have it be part of the filter
> selection. So, throw another step in the mix: filter 1, 2, 3, 4, then
> Off. Maybe that is not even possible to do that way even if there was
> enough space left.
>
> I figure that would kill two birds - it's status gets stored when the
> rig is powered down AND it makes it easy to get to.
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