K3 : AM synchronous detection

[David Pratt-2]

I wonder if there is a list available of the K3 features that are NOT
yet activated in the current firmware.

Although I have a 6kHz filter installed, I am unable to enable
synchronous detection in AM mode. (Owner's Manual p  I have the filter
in slot FL2 and have it activated as 6.00 in AM mode when fully
clockwise.  The bandwidth control only goes up to 3kHz on AM, but goes
up to 6kHz on other modes. Is this normal or do I have something not
configured correctly? Perhaps the 3kHz refers to the width from the
centre carrier, hence giving a total bandwidth of 6kHz?

73
--
David G4DMP
Leeds, England, UK
------


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[KK7P]

> I wonder if there is a list available of the K3 features that are NOT
> yet activated in the current firmware.

Check the errata sheet that came with the radio.  As features are added,
they'll be listed in the firmware updates, viewable through the K3 Utility.

> ...I am unable to enable synchronous detection in AM mode.

Not yet available.  You can use USB or LSB and FINE tuning for the
moment, as the K3 is very stable and most AM transmissions are as well.

> ...The bandwidth control only goes up to 3kHz on AM, but goes
> up to 6kHz on other modes. Is this normal...

WIDTH refers to the fianl audio bandwidth.  IF is 1:1 to the IF
bandwidth in CW, SSB and DATA modes.  AM IF bandwidth is twice the audio
bandwidth.  FM will have a fixed IF bandwidth, at least initially, and
WIDTH will refer to the AF response only.

73,

Lyle KK7P

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[David Pratt-2]

In a recent message, Lyle Johnson <[hidden email]> wrote ...
>> I wonder if there is a list available of the K3 features that are NOT
>>yet activated in the current firmware.
>
>Check the errata sheet that came with the radio.  As features are
>added, they'll be listed in the firmware updates, viewable through the
>K3 Utility.

Many thanks, Lyle, but no mention of any missing features in the Errata
sheet that I got with my kit. (Rev. C-3, November 26, 2007)

>> ...I am unable to enable synchronous detection in AM mode.
>
>Not yet available.  You can use USB or LSB and FINE tuning for the
>moment, as the K3 is very stable and most AM transmissions are as well.

Thanks again. Yes, AM medium wave broadcast (even music) sounds good in
USB/LSB modes.

>> ...The bandwidth control only goes up to 3kHz on AM, but goes  up to
>>6kHz on other modes. Is this normal...
>
>WIDTH refers to the fianl audio bandwidth.  IF is 1:1 to the IF
>bandwidth in CW, SSB and DATA modes.  AM IF bandwidth is twice the
>audio bandwidth.  FM will have a fixed IF bandwidth, at least
>initially, and WIDTH will refer to the AF response only.

Excellent - that confirms #00186 is working okay.

73
--
David G4DMP
Leeds, England, UK
------


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[Dave Martin-2]

>
> > ...The bandwidth control only goes up to 3kHz on AM, but goes
> > up to 6kHz on other modes. Is this normal...
>
> WIDTH refers to the fianl audio bandwidth.  IF is 1:1 to the IF
> bandwidth in CW, SSB and DATA modes.  AM IF bandwidth is twice the audio
> bandwidth.  FM will have a fixed IF bandwidth, at least initially, and
> WIDTH will refer to the AF response only.
>
When I had my 746Pro I really enjoyed the 9 KHz max bandwidth for AM
broadcast when conditions allowed.  I had a hi-fi speaker I could
switch to.  I'm wondering if we'll be able to have more bandwidth on
AM when we use a 12 KHz or similar roofing filter.

Dave  W5DHM
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[KK7P]

> ...I'm wondering if we'll be able to have more bandwidth on
> AM when we use a 12 KHz or similar roofing filter.

I expect this will be the case.

73,

Lyle KK7P

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[AC7AC]

CONTENTS DELETED

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[Dave Martin-2]

Roger, Ron.

I just hadn't seen any information that would indicate how wide the
DSP filters would go if one had a roofing filter wider than 6 KHz.
I've used only one sideband when there was interference on one side of
the other of an AM signal, but always used the 746Pro's synchronous AM
when possible.  That's one thing it did well.  So I'm hoping that the
firmware will develop to allow better than 3 KHz real AM if one has
the roof for it.  And surely it will, the way the guys are going.
Better and better every week.  By the time my K3 arrives there'll be
nothing left to whine about.

On Jan 12, 2008 1:18 PM, Ron D'Eau Claire <[hidden email]> wrote:

> Hello Dave:
>
> The errata with the list of features is the one you should have received
> with the Owner's manual. The current one on the Elecraft web site is C1-1
> dated Nov 18.
>
> http://www.elecraft.com/manual/K3%20owner's%20man%20errata%20C1-1.pdf
>
> It sounds like you were looking at the errata sheet for the Kit assembly
> manual.
>
> I have a 6 kHz filter as well, and for best audio fidelity I use a SSB mode
> to listen to broadcast AM. The excellent stability and high tuning accuracy
> of the K3 means I just punch in the frequency I want and even music is
> within one or two Hz of the right frequency - much too close for me to hear
> any tone error.
>
> As Lyle noted, the I.F. bandwidth of an AM signal is *twice* the audio
> bandwidth since there are two sidebands that must fit through the 6 kHz
> filter bandpass on an AM signal. I find that's FB on Ham AM signals, but
> those commercial AM stations who make full use of their 5 kHz audio
> bandwidth are cut off at about 3 kHz in AM mode. Gong to SSB mode with the 6
> KHz filter allows the full audio bandwidth through.
>
> Ron AC7AC
>

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