P3 Question

[pastormg]

Good Evening,
This is Mark Griffin, KB3Z. I was reading about the P3 and was wondering what the Maximum Panadapter Bandwidth was. I was reading about the Flex 6300 and they say their Max Panadapter Bandwidth is 7 Mhz. How does the P3 stack up to that? Thanks!!  Mark KB3Z
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[Eric Ross]

If you are referring to the span it is 200Khz.

http://www.elecraft.com/P3/p3.htm


On Mon, May 19, 2014, at 06:03 PM, [hidden email] wrote:

> Good Evening,
> This is Mark Griffin, KB3Z. I was reading about the P3 and was wondering
> what the Maximum Panadapter Bandwidth was. I was reading about the Flex
> 6300 and they say their Max Panadapter Bandwidth is 7 Mhz. How does the
> P3 stack up to that? Thanks!!  Mark KB3Z
> ______________________________________________________________
> 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]

--
  Eric Ross
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[Elecraft mailing list]

It is 200 KHz , but for me I rarely use it that wide.

It is more of a look Ma, it goes this wide, but in practice I rarely use it muck over 20 or 50
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[wayne burdick]

On May 19, 2014, at 6:11 PM, Eric Ross <[hidden email]> wrote:

> If you are referring to the span it is 200Khz.
>
> http://www.elecraft.com/P3/p3.htm

Correct.

The K3 is a superhet transceiver with narrow ham-band filtering in the front end (averaging about 500 kHz, varying with band). This reduces out-of-band interference to the P3 panadapter, which is tapped in just after the mixer. A view 200 kHz wide is about the most needed for typical operating scenarios. This width is also consistent with the narrowest of the band-pass filters.

A direct-sampling SDR can view a wider swath of the band for the same reason that it has 15-20 dB lower blocking dynamic range than a well-designed superhet: the A-to-D converter is not protected by narrow filtering.

73,
Wayne
N6KR

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