[Elecraft] P3 Waterfall

[Joe Subich, W4TV]

 > The manual notch is NOT within AGC loop.

It's not a matter or the notch being within the AGC loop (although
it should be for other reasons).  The P3 is fed from the output of
the first mixer - before the "roofing filter."  That's the only
place to get a 200 KHz +/- bandwidth.

73,

    ... Joe, W4TV


On 1/21/2011 9:26 AM, Johnny Siu wrote:
> The manual notch is NOT within AGC loop.
>
>   cheers,
>
>
> Johnny VR2XMC
>
>
>
>
> ________________________________
> 寄件人﹕ Chuck Shefflette<aa3cs at me.com>
> 收件人﹕ W4GRJ<w4grj at satterfield.org>
> 副本(CC) elecraft at mailman.qth.net
> 傳送日期﹕ 2011/1/21 (五) 9:33:54 PM
> 主題： Re: [Elecraft] P3 Waterfall
>
> This is because the P3 waterfall is taken from the IF output. The notch is done
> with the DSP on the 15KHz IF, not the 8215KHz IF.
>
> Chuck - AA3CS
> On 21 Jan 2011, at 08:15, W4GRJ wrote:
>
>> This is more a educational question. When using the manual notch to take out
>> a constant carrier, I can see the notch take out the carrier on the DSM780
>> waterfall however, the carrier is still visible on the P3 waterfall. Just
>> wondering why you can't see the same notch effect in the P3 waterfall.
>> Thanks,
>> Jack
>> W4GRJ
>
>
>
>
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