[PX3] v1.16 Bug?: Cursor in AM mode

[JE0LFI]

Hi

In AM mode,

When I specified the PBT to Low=0.0 and Hi=4.0, the cursor's low side(PBT I) displayed in the left side of the center. And hi side(PBT II) displayed in the right side of the center.

The band width of the cursor, looks like more than 4.0KHz across the center frequency.

Is this correct?

73,

JE0LFI / Nakamura

#wish FixTrack mode and SYNC-AM mode

[Alan Bloom]

The KX3 (and K3) bandwidth controls are with respect too the audio
frequency, not the RF frequency.  So in LSB mode, for example, the
bandwidths move in opposite directions on the KX3 and PX3.  In AM mode,
the bandwidth is mirrored about the carrier frequency.

Alan N1AL


On 12/23/2014 02:01 AM, JE0LFI wrote:

> Hi
>
> In AM mode,
>
> When I specified the PBT to Low=0.0 and Hi=4.0, the cursor's low side(PBT I)
> displayed in the left side of the center. And hi side(PBT II) displayed in
> the right side of the center.
>
> The band width of the cursor, looks like more than 4.0KHz across the center
> frequency.
>
> Is this correct?
>
> 73,
>
> JE0LFI / Nakamura
>
> #wish FixTrack mode and SYNC-AM mode
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/PX3-v1-16-Bug-Cursor-in-AM-mode-tp7596296.html
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[JE0LFI]

Hi Alan / N1AL and all

> In AM mode, the bandwidth is mirrored about the carrier frequency.

The bandwidth is not mirrored about the carrier freq displayed in PX3.

In NORM setting(Low=0.0, Hi=3.0), the PX3 bandwidth is as follows(where C is center):

_____==========C==========______

When I set Low to 0.5, the PX3 bandwidth is:

________=======C==========______

So, the PX3 bandwidth is not mirrored about the carrier freq.

Expected bandwidth is:

_____========__C__========______

Is this correct?

73,

JE0LFI / Nakamura



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[JE0LFI]

Hi Alan / N1AL, Hi all

AM mode bandwidth indication of PX3 will be inferred that it VSB(Vestigial Lower side band).

http://en.wikipedia.org/wiki/Single-sideband_modulation

Since using the VSB, will be displayed cursor across the carrier frequency, such like this:

_____==C=====_____ : Vestigial Lower Side Band VSB

Future, if the SYNC-AM mode is supported, you'll be switching to Vestigial Upper side band.

_=====C==_____ : Vestigial Upper Side Band VSB

73 and Here's to the New Year ! Cheers !

---

 JE0LFI / Nakamura

[pa0pje]

Hi Nakamura

I think you're right about this but also I think that the lo/hi-cut
settings affect the audio and not the "IF" bandwidth.

I know that in the Perseus software you can influence both AM sidebands
independently and in fact listen to only one sideband plus carrier in
both AM and AM-sync and probably you would like to have that option as
well in the KX3... The only way I can get this option is by using the
KX3's I/Q output, a PC and HDSDR-software. HDSDR toggles in AM-sync
between LSB, USB and DSB with a simple click on the AM-Sync button.

73 and Happy New Year,
Peter - PA0PJE

Op 2014-12-30 05:29 schreef JE0LFI:

> Hi Alan / N1AL, Hi all
>
> AM mode bandwidth indication of PX3 will be inferred that it VSB(Vestigial
> Lower side band).
>
> http://en.wikipedia.org/wiki/Single-sideband_modulation
>
> Since using the VSB, will be displayed cursor across the carrier frequency,
> such like this:
>
> _____==C=====_____ : Vestigial Lower Side Band VSB
>
> Future, if the SYNC-AM mode is supported, you'll be switching to Vestigial
> Upper side band.
>
> _=====C==_____ : Vestigial Upper Side Band VSB
>
> 73 and Here's to the New Year ! Cheers !
>
> ---
>
>   JE0LFI / Nakamura
>

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