Was thinking the very same thing.... but I am not so sure I will be
able to let my K3S go... I may just be adding... And then I can make
the K3S a traveling system.
______________________
Clay Autery, KY5G
(318) 518-1389
On 04-Jun-19 21:50, Bill Johnson wrote:
Wayne, all these options and modernizations, even though I love my K3S and really don't
need to upgrade, I will be "forced" to break down and buy one.
72 & 73,
Bill
K9YEQ
FT'er for K2, KX1, KX3, KXPA100, KAT500, W2, etc.
-----Original Message-----
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On
Behalf Of Wayne Burdick
Sent: Tuesday, June 4, 2019 9:19 PM
To: Elecraft Reflector <elecraft@mailman.qth.net>
Subject: [Elecraft] K4: superhet vs. direct sampling
The superhet module buys a lot of BDR improvement. But also -- a subtlety I've
failed to mention so far -- the superhet module is intended to somewhat improve
2 kHz IMDDR3 *and* make this figure more repeatable.
Q: Say what?
A: As Rob Sherwood noted many times before finally immortalizing this point in
his must-read footnotes, A-to-D converters sharing the same part number are not
all created equal. The long-time previous occupant of his Top Spot benefitted
from a never-corroborated monotonicity in its ADC's LSBs. An act of god. The
product of a very good day at the silicon foundry when, serendipitously, all
the bunny suits were defect-free, and no one was exhaling molecules of grain
alcohol or other substances from the night before.
That said, most ops can get by without the extra BDR and IMDDR3, because
they're not situated in the RF equivalent of the Gulf Stream. Hence the
different K4 models.
73,
Wayne
N6KR
On Jun 4, 2019, at 5:10 PM, Lyle Johnson <kk7p4...@gmail.com> wrote:
Mark,
The "20 dB lower than a K3" figure is an estimate for 100 kHz Blocking Dynamic
Range rather than the 2 kHz Narrow Spaced Dynamic Range.
The K3 is listed at 140 to 150 dB (depending on model, synthesizer, etc) on Sherwood's
Receiver Test Data page. The K4 series without the "HD" option are estimated
to be in the 120 to 130 dB range, typical of other direct sampling SDR products (Flex,
Apache, Icom, ...).
73,
Lyle KK7P
On 6/4/19 4:00 PM, mark roz via Elecraft wrote:
Before putting my money up front for the first run of K4D I need to
know what is the dynamic range of the K4D RX at 2kHz spacing. K3 is 105 dB and
K4D? If it is 20dB lower than K3 than it would be 85dB-correct?
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