New K3 F/W - MCU: V 1.49 DSP: V 1.46 NR Improved. AM added

[Eric Swartz - WA6HHQ]

We've been busy at Elecraft Engineering this week and we have just
placed new K3 firmware on the ftp site.
MCU:  V 1.49
DSP:  V 1.46

New Features:

Noise Reduction significantly improved. Also, NR can be used with narrow
filters in CW mode.

AM mode added. (6 kHz Filter required.)

NOTE: AM Power control temporarily works as follows: when you set power
to 100 W in AM mode, it means 100 W *peak power*, and 25 W *carrier
power*.  Also, the bar graph shows peak power in AM mode. This will be
corrected later so the display and bar graph both show carrier
power.Manual notch frequency defaults to 2 kHz (originally 200 Hz).

See 'Release Notes'  in the K3 Update Utility for a complete revision
history.

Enjoy! :-)

73, Eric   WA6HHQ


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[KK7P]

> Is synchronous detection is enabled?

Not yet.

73,

Lyle KK7P

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[johnny-52]

Hello Lyle,

Under AM mode, the DSP bandwidth control seems restricted to 6KHz.  Is there
any way that I can change it to 6KHz to match the AM crystal roofing filter?

73 & TNX,

Johnny VR2XMC
----- Original Message -----
From: "Lyle Johnson" <[hidden email]>
To: "DaleJ" <[hidden email]>
Cc: <[hidden email]>
Sent: Sunday, December 16, 2007 12:49 AM
Subject: Re: [Elecraft] New K3 F/W - MCU: V 1.49 DSP: V 1.46 NR Improved.AM
added


>> Is synchronous detection is enabled?
>
> Not yet.
>
> 73,
>
> Lyle KK7P

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[KK7P]

> Under AM mode, the DSP bandwidth control seems restricted to 6KHz.  Is
> there any way that I can change it to 6KHz to match the AM crystal
> roofing filter?

With the 6 kHz roofing filter, you should be able to set HI CUT to 3 kHz
in AM mode.  My radio is not immediately at hand at the moment to verify
this.  If HI CUT does not go to 3 kHz, then it will be addressed in the
next firmware update.

73,

Lyle KK7P

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[johnny-52]

Thanks Lyle.

Yes,  I can set the HI CUT to 3Khz.  Can it be increased to 6KHz to match
the AM roofing filter?

73

johnny VR2XMC

----- Original Message -----
From: "Lyle Johnson" <[hidden email]>
To: "johnny" <[hidden email]>
Cc: "DaleJ" <[hidden email]>; <[hidden email]>
Sent: Sunday, December 16, 2007 3:06 PM
Subject: Re: [Elecraft] New K3 F/W - MCU: V 1.49 DSP: V 1.46 NR Improved.AM
added

>> Under AM mode, the DSP bandwidth control seems restricted to 3KHz.  Is
>> there any way that I can change it to 6KHz to match the AM crystal
>> roofing filter?
>
> With the 6 kHz roofing filter, you should be able to set HI CUT to 3 kHz
> in AM mode.  My radio is not immediately at hand at the moment to verify
> this.  If HI CUT does not go to 3 kHz, then it will be addressed in the
> next firmware update.
>
> 73,
>
> Lyle KK7P

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[KK7P]

> Yes,  I can set the HI CUT to 3Khz.  Can it be increased to 6KHz to
> match the AM roofing filter?

Not in AM mode.  In AM there are two sidebands, so an audio frequency of
3 kHz results in upper and lower sidebands, thus requiring a 6 kHz filter.

In SSB mode, you can set HI CUT to a much higher frequency.  The K3 can
pass audio with an upper limit around 5 kHz.

73,

Lyle KK7P

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[dj7mgq]

Hallo Lyle,

 > With the 6 kHz roofing filter, you should be able to set HI CUT to
 > 3 kHz in AM mode.

I do not have my radio here, so from memory:

With the 6kHz filter it was not possible to set bandwidth greater than
2.8kHz and/or Hi/lo cut to 3000Hz and 200Hz using the knobs. Using the
XFIL button 6kHz appeared to be reachable but no bandwidth between 6kHz
and 2.8kHz.

If the 3kHz you mention is equal to 6kHz RF bandwidth (is equal to 3kHz
AF bandwidth?), then I would suggest displaying the RF and not the AF
bandwidth. It might become confusing when one wants to shift the filter
to listen mainly to one side band; On a clear channel with say 4kHz or
when avoiding interference with 2kHz.

vy 73 de toby
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[Joe Subich, W4TV]

> With the 6kHz filter it was not possible to set bandwidth
> greater than 2.8kHz and/or Hi/lo cut to 3000Hz and 200Hz
> using the knobs.  

That's correct.  AM is a double sideband mode and requires
equal bandwidth above and below the carrier.  Thus with a
6 KHz filter, one would be limited to a 3 KHz (or slightly
more depending on the filter skirts) maximum audio frequency.  

> It might become confusing when one wants to shift the filter
> to listen mainly to one side band; On a clear channel with
> say 4kHz or when avoiding interference with 2kHz.

Receiving double sideband AM with offset tuning has some
unique audio equalization requirements since the low audio
frequencies are boosted by 6dB due to the partial remaining
sideband.

Lyle, it might be worth considering a higher high cut/wider
bandwidth for receive with offset tuning.  If I recall, many
of the SW broadcasters are using a "compatible" modulation
that is essentially USB with a reduced (-6dB) carrier.  In
fact, it might even be worth considering "compatible AM"
(VSB or SSB with reduced carrier) transmit - after all it's
only programming <G>.

73,

   ... Joe, W4TV
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Toby Deinhardt
> Sent: Sunday, December 16, 2007 2:44 AM
> To: Lyle Johnson
> Cc: [hidden email]; DaleJ
> Subject: Re: [Elecraft] New K3 F/W - MCU: V 1.49 DSP: V 1.46
> NR Improved.AMadded
>
>
> Hallo Lyle,
>
>  > With the 6 kHz roofing filter, you should be able to set HI CUT to
>  > 3 kHz in AM mode.
>
> I do not have my radio here, so from memory:
>
> With the 6kHz filter it was not possible to set bandwidth
> greater than
> 2.8kHz and/or Hi/lo cut to 3000Hz and 200Hz using the knobs.
> Using the
> XFIL button 6kHz appeared to be reachable but no bandwidth
> between 6kHz
> and 2.8kHz.
>
> If the 3kHz you mention is equal to 6kHz RF bandwidth (is
> equal to 3kHz
> AF bandwidth?), then I would suggest displaying the RF and not the AF
> bandwidth. It might become confusing when one wants to shift
> the filter
> to listen mainly to one side band; On a clear channel with
> say 4kHz or
> when avoiding interference with 2kHz.
>
> vy 73 de toby
> _______________________________________________
> Elecraft mailing list
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>
>

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[dj7mgq]

Hi Joe,

> Receiving double sideband AM with offset tuning has some
> unique audio equalization requirements since the low audio
> frequencies are boosted by 6dB due to the partial remaining
> sideband.

Agreed, but when, for example, trying to fish out weak signals from NA
(10kHz steps) between strong EU stations (9kHz channels) on MW,
sometimes one does want to shift around the passband. Audio quality is
not so important in this case. Many times SSB is better, but sometimes not.

At any rate, I personally would prefer to see the bandwidth in terms of
RF bandwidth and not AF bandwidth.

vy 73 de toby
--
DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz)
K2/10  #885
K2/100 #3248
K3/100 #67
DOK C12, BCC, DL-QRP-AG, JN58td
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