[Elecraft] P3 Question

[Wayne Burdick]

On May 19, 2014, at 6:11 PM, Eric Ross <epr at evross.com> 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