For me a software-defined receiver is one where the demodulators and filters
are implemented (defined) in software. Adding a synchronous AM detector is 100%
software.
We already have precise terms for receiver architectures: superhet, direct
conversion, and TRF (no conversion). Direct sampling
Don,
I'm not sure there IS an accepted definition of a "Full SDR" radio, but
it's just a matter of semantics, anyway. I just wanted to point out
that the KX2 and KX3 use local oscillators and mixers to convert the RF
to the IF, like any superhet. From there, it's pure SDR. (Perhaps
aside
Scott,
By your definition of an SDR, that may be true.
Some SDRs today are direct sampling at the antenna, but think back to
SDRs in the recent past when high frequency direct sampling was only
achieved at great cost - the simplest example is the SoftRock 40 which
used a quadrature mixer to
On 12/22/2017 11:37, Don Wilhelm wrote:
Of course, the KX2 is *not* a superhet, it is a full SDR. If the "IF"
were at a higher frequency, the VFO would be further away from the
signal frequency - by the frequency of the IF.
I must disagree. All the digital processing takes place after the
This sounds like a fun area to study, Thanks for putting me on the path. I
will look up KK7B's work.
KV4TT - Mike
On Fri, Dec 22, 2017 at 12:37 PM, Don Wilhelm
wrote:
> Mike,
>
> Think of the 8kHz shift similar to a low frequency (8kHz) IF if your
> thinking is along
Mike,
Think of the 8kHz shift similar to a low frequency (8kHz) IF if your
thinking is along the lines of a superhet receiver.
Of course, the KX2 is *not* a superhet, it is a full SDR. If the "IF"
were at a higher frequency, the VFO would be further away from the
signal frequency - by the
Hi Don,
Thank you for the great explanation.
I must have had the ATT on when I did the original power measurement
(rough) on the SDR
I tested again and this time I get:
-77dBm - Preamp On
-55dBm - Preamp Off
-74dBm - ATT on
Just relative differences with the absolutes unique to my setup of
Mike,
The KX2 is fully an SDR with the "computer" in the enclosure. Yes, it
has a permanent 8kHz shift, so all the DSP operation is conducted at
8kHz (not audio), including the nulling and suppression.
You are hearing the actual VFO freuency - it is 8kHz from the operating
frequency of the
Hello group,
I received a new KX2 from Elecraft a few days ago and I am really enjoying
the little GEM!
As many of you already must know, the receiver performs brilliantly. I have
been comparing with a couple of SDR receivers in the shack and the KX2 is
preferred for weak signal reception in
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