Fred,
When you have a 24 bit A/D and not looking at the entire spectrum,
this should not be as big a problem as you imply, if gain distribution
is correct. 24 bits should yield a great enough dynamic range to cover
greater than ~ 95% of time; that last ~5% covers your friend next door
with a KW or that thunderstorm over head. 24 bits also allows for some
amplification to overcome the down stream noise figure that may be
greater than ambient.
On the other hand, the Flex uses a really high speed A/D, but it is
only 16 bits, if memory serves. That architecture is far more sensitive
to gain distribution. Those who have suggested that the Flex may have a
problem with all the bits going to 1 in a stress environment may be very
correct. IMHO: With the state of the A/D art as it is, I believe
Elecraft has the better practical architecture. As soon as low noise,
high speed A/Ds become available with greater than 16 bits, my opinion
may change.
73,
Barry
K3NDM
------ Original Message ------
From: "Fred Jensen" <[email protected]>
To: [email protected]
Sent: 11/10/2015 7:32:56 PM
Subject: Re: [Elecraft] Sherwood Receiver Test Data - K3S Added Today
Question from a mathematics major [whose parents wanted him to be a
EE]:
In a direct-sampling receiver, how do you control the input level to
the ADC to achieve maximum available dynamic range without clipping at
the ADC?
73,
Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org
On 11/10/2015 3:58 PM, Steve Ellington wrote:
Looks like the K3S should be above the Flex because the Flex achieved
2DB
higher due to:
Footnote Y --- "This is a testing anomaly of a direct-sampling
receiver."
Congratulations K3S
Steve N4LQ
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