[Elecraft] Sherwood Receiver Test Data - K3S Added Today

[Gary]

Joe,

Pity this distinct difference is not advertised widely for those folks not well versed in the importance of receiver specs.

But I have to add that lurking on this reflector is certainly a good way to learn what is important when evaluating a transceiver.

I place great emphasis on receiver specs and antenna selection. These to me are the most important.

You gotta here them to work them.

Glad I upgraded my K3 (2007) vintage, guess now mine can be termed a boat anchor?

73

Gary

-----Original Message-----
From: "Joe Subich, W4TV" <lists at subich.com>
Sent: ‎11/‎11/‎2015 10:25 AM
To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Sherwood Receiver Test Data - K3S Added Today


Of note - the K3S and K3 with new synthesizers were essentially +/-
1 dB of each other and swapping the advantage from test to test.
This is good news for owners of the original K3 - the synthesizer
upgrade will provide every bit of the performance "upgrade" in the
K3S.

> 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."

Yes, the Flex-67000 should be dropped significantly because it can not
produce the both claimed dynamic range and noise floor (weak signal
sensitivity) at the same time.  Multiple -30 dBm (105 dB DR referenced
to -135 dBm MDS) signals will cause ADC overflow with noticeable
clicking and popping (distortion) with the preamplifier enabled.  Turn
off the preamplifier to prevent ADC overflow and the MDS degrades to
-118 dB (nearly 20 dB less sensitive) and completely unsatisfactory
above 20 MHz or so.

73,

    ... Joe, W4TV


On 11/10/2015 6:58 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
>
> On Tue, Nov 10, 2015 at 6:48 PM, Bill Breeden <breedenwb at cableone.net>
> wrote:
>
>>
>> Rob Sherwood added the K3S to his Receiver Test Data page today.
>>
>> 73,
>>
>> Bill - NA5DX
>>
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