Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Oliver Dröse]

Problem is that (at least in SSB) I feel the K3 receiver (with the "old" 
synth board) is never the limiting factor, it's always all those dirty 
other signals (splatter, key-clicks, a.s.o. ... the new synth board will 
*not* help anything if they splatter into your passband). I will not 
upgrade for exactly that reason! In every contest I feel I already have 
too good an RX and TX while other people gain advantages from their 
dirty rigs ... :-(


73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de


Am 14.02.2015 um 01:44 schrieb Don Wilhelm:

Johnny,

Hopefully I can simplify it a bit given your example.
That S9+60dB signal will have a weaker response in your receiver *if* 
your receiver was the limiting factor.  If the transmitter phase noise 
(splatter and other 'bad stuff' was the original problem, then you may 
or may not have any improvement for that example.


In other words, you will notice an improvement if other signals on the 
band are relatively clean.  The improvement when other signals on the 
band are not clean will not be as obvious.


Actually if an S9+60dB signal 10 kHz away is going to give you 
problems, then that signal is coming from a 'dirty transmitter'. I 
think a better example would be -- If you can operate within 2 kHz of 
a strong signal with the current KSYN3, then the KSYN3A may be able to 
allow you to operate within 1.5 to 1.8 kHz of that same signal.  In 
other words, you will be able to "saddle up closer" to any signal 
unless the transmitter is creating trash.


Note: All numbers are for relative comparison only.  I pulled those 
numbers out of my head for illustration purposes only and do not 
represent any test data.  I have not seen nor used the KSYN3A.


73,
Don W3FPR

On 2/13/2015 7:19 PM, Johnny Siu wrote:
I must admit that understanding those figures are beyond my 
knowledge.  In practical terms, if I can now hear a below S1 cw weak 
signal 10KHz away from a S9+60db station before upgrade, what will be 
the improvement after the installation of KSYN3A assuming operating 
under the same condition?
Such a demonstation was given to me when I visited Icom HQ in Osaka 
last year in the announcement of the IC7850/IC7851. Again, IC7850 is 
known foir extremely low phase noise.
Can any elecrafters interpret the improvements in an understandable 
layman terms?

73
Johnny VR2XMCK-Line + KX3 + HR50
寄件人︰ Wayne Burdick 
  收件人︰ Elecraft Reflector 
副本(CC)︰ "elecraft...@yahoogroups.com" 
  傳送日期︰ 2015年02月14日 (週六) 7:34 AM
  主題︰ [Elecraft] Update to KSYN3A FAQ (some measured dynamic range 
numbers)

Hi all,

I've updated the KSYN3A FAQ with the following information regarding 
testing of a K3 with the new synthesizer performed by Rob Sherwood, 
NC0B.


* * *

Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 
when using the new synthesizer?


A: Our tests show in excess of 105 dB with the narrowest filters, 
though there are many factors, and this should be considered 
approximate. (A very robust test setup is required to make these 
measurements.) Rob Sherwood tested a K3 with a KSYN3A and obtained 
the following results:


 2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
 2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB

Rob will be posting this information in his receiver performance 
chart (http://www.sherweng.com/table.html) after he completes his 
full suite of tests.


* * *

The above numbers were used with Rob's permission.

73,
Wayne
N6KR

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Chortek Bob via Elecraft]

The table got compressed. Let me try again - 
IMDDR      Signal causing IMD = Noise Floor

55 db    S9
60 db    S9 plus 5 db
65 db    S9 plus 10 db
70 db    S9 plus 15 db
75 db    S9 plus 20 db
80 db    S9 plus 25 db
85 db    S9 plus 30 db
90 db    S9 plus 35 db
95 db    S9 plus 40 db
100 db    S9 plus 45 db
105 db    S9 plus 50 db
  From: Chortek Bob via Elecraft 
 To: Johnny Siu ; Wayne Burdick ; 
Elecraft Reflector  
Cc: "elecraft...@yahoogroups.com"  
 Sent: Saturday, February 14, 2015 12:57 PM
 Subject: Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range 
numbers)
   
Hi Johhny,
I'll probably get flamed for saying this, or someone more knowledgeable that I 
will point out how ignorant I am, but here is my layperson's understanding of 
this issue:
Assuming a MDS of -128 dbm, and an S9 signal equivalent to -73 dbm, IMD will 
begin to be a problem when two out of passband signals combine as follows:
IMDDR      Signal causing IMD = Noise Floor
55 db    S960 db    S9 plus 5 db65 db    S9 plus 10 db70 db    S9 plus 15 db75 
db    S9 plus 20 db80 db    S9 plus 25 db85 db    S9 plus 30 db90 db    S9 plus 
35 db95 db    S9 plus 40 db100 db    S9 plus 45 db105 db    S9 plus 50 db
You can see that if your rig has an IMDDR of 90 db, it would take a signal S9 + 
35 db before you would likely notice any adverse affects from IMD caused by two 
out of passband signals (at the required spacing).
So, a person who has a rig with an IMDDR of say 95 db would only notice an 
improvement in the IMDDR when they are exposed to two out of band signals 
causing an IMD product when those signals are more than S9 plus 40 db.  The 
question you need to ask yourself is, how often are you faced with that 
situation?  The constant pursuit for improved IMD performance, it seems to me, 
is a worthy goal, but whether it benefits a particlar amature operator depends 
on whether he or she is faced with two out of passband signals that combine 
with the spacing required to cause an IMD product in his or her rig, AND the 
number of times those signals are sufficiently strong to exceed the IMDDR of 
their rig.  For some contestants, this is a BIG factor, but for other folks it 
rarely matters. It all depends on your operating environment

I'm am sure this is not 100 correct, as I am not an engineer, but you should 
get the general idea  
73,

Bob/AA6VB

      From: Johnny Siu 
 To: Wayne Burdick ; Elecraft Reflector 
 
Cc: "elecraft...@yahoogroups.com"  
 Sent: Friday, February 13, 2015 4:19 PM
 Subject: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)
  
I must admit that understanding those figures are beyond my knowledge.  In 
practical terms, if I can now hear a below S1 cw weak signal 10KHz away from a 
S9+60db station before upgrade, what will be the improvement after the 
installation of KSYN3A assuming operating under the same condition?
Such a demonstation was given to me when I visited Icom HQ in Osaka last year 
in the announcement of the IC7850/IC7851.  Again, IC7850 is known foir 
extremely low phase noise.
Can any elecrafters interpret the improvements in an understandable layman 
terms?
73
Johnny VR2XMCK-Line + KX3 + HR50
       寄件人︰ Wayne Burdick 
 收件人︰ Elecraft Reflector  
副本(CC)︰ "elecraft...@yahoogroups.com"  
 傳送日期︰ 2015年02月14日 (週六) 7:34 AM
 主題︰ [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)
  
Hi all,

I've updated the KSYN3A FAQ with the following information regarding testing of 
a K3 with the new synthesizer performed by Rob Sherwood, NC0B.

* * *

Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 when using 
the new synthesizer?

A: Our tests show in excess of 105 dB with the narrowest filters, though there 
are many factors, and this should be considered approximate. (A very robust 
test setup is required to make these measurements.) Rob Sherwood tested a K3 
with a KSYN3A and obtained the following results:

    2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
    2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB

Rob will be posting this information in his receiver performance chart 
(http://www.sherweng.com/table.html) after he completes his full suite of tests.

* * *

The above numbers were used with Rob's permission.

73,
Wayne
N6KR

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This

Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Chortek Bob via Elecraft]

Hi Johhny,
I'll probably get flamed for saying this, or someone more knowledgeable that I 
will point out how ignorant I am, but here is my layperson's understanding of 
this issue:
Assuming a MDS of -128 dbm, and an S9 signal equivalent to -73 dbm, IMD will 
begin to be a problem when two out of passband signals combine as follows:
IMDDR      Signal causing IMD = Noise Floor
55 db    S960 db    S9 plus 5 db65 db    S9 plus 10 db70 db    S9 plus 15 db75 
db    S9 plus 20 db80 db    S9 plus 25 db85 db    S9 plus 30 db90 db    S9 plus 
35 db95 db    S9 plus 40 db100 db    S9 plus 45 db105 db    S9 plus 50 db
You can see that if your rig has an IMDDR of 90 db, it would take a signal S9 + 
35 db before you would likely notice any adverse affects from IMD caused by two 
out of passband signals (at the required spacing).
So, a person who has a rig with an IMDDR of say 95 db would only notice an 
improvement in the IMDDR when they are exposed to two out of band signals 
causing an IMD product when those signals are more than S9 plus 40 db.  The 
question you need to ask yourself is, how often are you faced with that 
situation?  The constant pursuit for improved IMD performance, it seems to me, 
is a worthy goal, but whether it benefits a particlar amature operator depends 
on whether he or she is faced with two out of passband signals that combine 
with the spacing required to cause an IMD product in his or her rig, AND the 
number of times those signals are sufficiently strong to exceed the IMDDR of 
their rig.  For some contestants, this is a BIG factor, but for other folks it 
rarely matters. It all depends on your operating environment

I'm am sure this is not 100 correct, as I am not an engineer, but you should 
get the general idea  
73,

Bob/AA6VB

  From: Johnny Siu 
 To: Wayne Burdick ; Elecraft Reflector 
 
Cc: "elecraft...@yahoogroups.com"  
 Sent: Friday, February 13, 2015 4:19 PM
 Subject: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)
   
I must admit that understanding those figures are beyond my knowledge.  In 
practical terms, if I can now hear a below S1 cw weak signal 10KHz away from a 
S9+60db station before upgrade, what will be the improvement after the 
installation of KSYN3A assuming operating under the same condition?
Such a demonstation was given to me when I visited Icom HQ in Osaka last year 
in the announcement of the IC7850/IC7851.  Again, IC7850 is known foir 
extremely low phase noise.
Can any elecrafters interpret the improvements in an understandable layman 
terms?
73
Johnny VR2XMCK-Line + KX3 + HR50
       寄件人︰ Wayne Burdick 
 收件人︰ Elecraft Reflector  
副本(CC)︰ "elecraft...@yahoogroups.com"  
 傳送日期︰ 2015年02月14日 (週六) 7:34 AM
 主題︰ [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)
  
Hi all,

I've updated the KSYN3A FAQ with the following information regarding testing of 
a K3 with the new synthesizer performed by Rob Sherwood, NC0B.

* * *

Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 when using 
the new synthesizer?

A: Our tests show in excess of 105 dB with the narrowest filters, though there 
are many factors, and this should be considered approximate. (A very robust 
test setup is required to make these measurements.) Rob Sherwood tested a K3 
with a KSYN3A and obtained the following results:

    2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
    2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB

Rob will be posting this information in his receiver performance chart 
(http://www.sherweng.com/table.html) after he completes his full suite of tests.

* * *

The above numbers were used with Rob's permission.

73,
Wayne
N6KR

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Ian White]

>> If both RX and TX are using the same synthesizer, TX phase noise
>> should be lowered.
>
>Not necessarily -- it depends on the design. Some rigs have low phase
>noise on RX but not on TX.
>

The noise that we hear on transmitted signals, or through reciprocal
mixing in our receivers, is always the COMPOSITE noise - the vector sum
of both the Phase Noise and the Amplitude-Modulated noise. 

Most modern test equipment measures exclusively phase noise, so that's
what the equipment reviews quote as well. Then the advertisers jumped on
the bandwagon so now it's "Phase noise, phase noise, everybody's talkin'
'bout phase noise!" We are carelessly sliding towards labeling every
kind of noise as "phase noise" when very often it isn't. 

Don't ever forget that AM noise component. At some frequencies AM noise
can be even more important than the phase noise.  

If the transmit and receive paths use the same frequency-determining
signals (oscillators) then the phase noise - true phase noise, that is -
in the TX and RX paths should be very similar. Generically they should
be the same, so you'd need to identify some quite specific reasons for
PN to be different between TX and RX in any particular transceiver.

But a transceiver also contains many, many sources of AM noise - not so
much in the oscillators but in the TX and RX signal pathways. Because
those pathways are different, the levels of AM noise generically *do*
differ between TX and RX. 

Therefore we should always expect the *composite* noise to be different
between TX and RX - and that will probably be mostly because of
different AM noise levels.

Problems with AM noise on transmit are often made worse by designers
forgetting that the problem even exists. In older analog rigs, for
example, there may be significant AM noise on transmit because the TX
chain starts out at too low a signal level, and the designer forgot to
use low-noise techniques in that weak spot. 

In modern digital rigs, the analog TX signal comes from a DAC (Digital
to Analog Converter) which is heavily laden with AM digital noise that
needs careful filtering. There is an awful example in SM5BSZ's 2013
article on 'Band Pollution by Amateur Transmitters'
.   Figure 8 shows a very high
noise level at the output of the DAC (enough to make the sine-wave look
like a fuzzy caterpillar). Then that noise is insufficiently filtered,
leaving serious TX noise sidebands of only -75dBc at +/- 300kHz. Because
this is almost entirely AM noise, any test that focuses exclusively on
phase noise will miss it... and that particular manufacturer did miss
it.

In contrast, the K3 came top of the table for suppression of wideband TX
noise (Table 1, which pre-dates the KX3).
 

73 from Ian GM3SEK



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Re: [Elecraft] Update to KSYN3A

[Ken Widelitz]

My interest in this update is a reduction in interference in an SO2R
environment with two K3s. 

 

What is the conventional wisdom regarding the potential improvement in this
particular area?

 

73, Ken, K6LA / VY2TT

 

 

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Jim Brown]

On Fri,2/13/2015 9:42 PM, Johnny Siu wrote:
If both RX and TX are using the same synthesizer, TX phase noise 
should be lowered.


Not necessarily -- it depends on the design. Some rigs have low phase 
noise on RX but not on TX.


73, Jim K9YC
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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[dave]

> That's a far ways from -89 dB that you
> quote.

The ARRL review in the April 2008 issue of the K3/10 showed reciprocal 
mixing as -95 dBc at 2 kHz spacing.


The ARRL review in the Jan 2009 issue of the K3/100 showed reciprocal 
mixing as -86 dBc at 2 kHz spacing.


This is the same lab. Dunno about same test equipment.

73 de dave
ab9ca/4



On 2/13/15 10:29 PM, Joe Subich, W4TV wrote:


On 2015-02-13 10:08 PM, Chortek Bob via Elecraft wrote:

The new synthesizer has essential the SAME IMDDR 106 or 103
depending  on the filter bandwidth.


Incorrect!  You are comparing measurements by different labs with
different test equipment and procedures.

Sherwood measured 104 dB w/200 Hz filter and 96 dB w/400 Hz filter
for the old Synth vs. 106 and 103 for new synth.  That's 2 to 7 dB
improvement depending on filter bandwidth.  Since the synthesizer
is about 6dBc/Hz better than the old synthesizer, the first order
estimation is that the improvement in narrow spaced IMDDR3 is due
to the decrease in phase noise.


So, my question:   is the real import of all this that the new
synthesizer will give the K3 an IMDDR which is NOT limited to 86
dbs by Reciprocal Mixing so we will now get the FULL benefit of a
IMDDR of 106/103?If so, that 20 db improvement is huge.


One would need to look into the way in which ARRL measures Reciprocal
Mixing to understand exactly what that "Spec" is telling you and what
improvement one might find.  It is safe to expect the reduction in
phase noise to directly impact both narrow spaced IMDDR3 and Reciprocal
Mixing.

BTW, I just reviewed the original ARRL review of the K3 (April 2008)
and their Reciprocal Mixing numbers were -116 dBc @20 KHz, -106 dBc
@ 5 KHz and -95dBc at 2 KHz.  That's a far ways from -89 dB that you
quote.  Assuming a 6 dBc/Hz noise improvement in the new synthesizer,
you can make the numbers -122, -112, -101 which would be a significant
improvement.

73,

   ... Joe, W4TV

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Joe Subich, W4TV]

On 2015-02-13 10:08 PM, Chortek Bob via Elecraft wrote:

The new synthesizer has essential the SAME IMDDR 106 or 103
depending  on the filter bandwidth.


Incorrect!  You are comparing measurements by different labs with
different test equipment and procedures.

Sherwood measured 104 dB w/200 Hz filter and 96 dB w/400 Hz filter
for the old Synth vs. 106 and 103 for new synth.  That's 2 to 7 dB
improvement depending on filter bandwidth.  Since the synthesizer
is about 6dBc/Hz better than the old synthesizer, the first order
estimation is that the improvement in narrow spaced IMDDR3 is due
to the decrease in phase noise.


So, my question:   is the real import of all this that the new
synthesizer will give the K3 an IMDDR which is NOT limited to 86
dbs by Reciprocal Mixing so we will now get the FULL benefit of a
IMDDR of 106/103?If so, that 20 db improvement is huge.


One would need to look into the way in which ARRL measures Reciprocal
Mixing to understand exactly what that "Spec" is telling you and what
improvement one might find.  It is safe to expect the reduction in
phase noise to directly impact both narrow spaced IMDDR3 and Reciprocal
Mixing.

BTW, I just reviewed the original ARRL review of the K3 (April 2008) and 
their Reciprocal Mixing numbers were -116 dBc @20 KHz, -106 dBc

@ 5 KHz and -95dBc at 2 KHz.  That's a far ways from -89 dB that you
quote.  Assuming a 6 dBc/Hz noise improvement in the new synthesizer,
you can make the numbers -122, -112, -101 which would be a significant
improvement.

73,

  ... Joe, W4TV

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Joe Subich, W4TV]

Argh!  That will make the K3 second to the Flex 6700 in Sherwood's
table  although the 100 KHz blocking will be better than the "A/D
Limited" for the 6700.

73,

   ... Joe, W4TV


On 2015-02-13 6:34 PM, Wayne Burdick wrote:

Hi all,

I've updated the KSYN3A FAQ with the following information regarding testing of 
a K3 with the new synthesizer performed by Rob Sherwood, NC0B.

* * *

Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 when using 
the new synthesizer?

A: Our tests show in excess of 105 dB with the narrowest filters, though there 
are many factors, and this should be considered approximate. (A very robust 
test setup is required to make these measurements.) Rob Sherwood tested a K3 
with a KSYN3A and obtained the following results:

 2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
 2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB

Rob will be posting this information in his receiver performance chart 
(http://www.sherweng.com/table.html) after he completes his full suite of tests.

* * *

The above numbers were used with Rob's permission.

73,
Wayne
N6KR

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Chortek Bob via Elecraft]

Thanks for the figures. I am trying to understand the amount of improvement we 
can expect. 
According to the ARRL Review in January 2009 the IMDDR was 106/103 dbm at 2 KHZ 
but the Reciprocal Mixing was -86dbc at 2KHZ offset with 500 HZ bandwidth.  
The new synthesizer has essential the SAME IMDDR 106 or 103 depending on the 
filter bandwidth.  
So, my question:   is the real import of all this that the new synthesizer will 
give the K3 an IMDDR which is NOT limited to 86 dbs by Reciprocal Mixing so we 
will now get the FULL benefit of a IMDDR of 106/103?If so, that 20 db 
improvement is huge.
I may be mixing apples and oranges, but I am just trying to understand this.  
Thanks for any clarification the group can provide.
73,
Bob/AA6VB

  From: Wayne Burdick 
 To: Elecraft Reflector  
Cc: "elecraft...@yahoogroups.com"  
 Sent: Friday, February 13, 2015 3:34 PM
 Subject: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)
   
Hi all,

I've updated the KSYN3A FAQ with the following information regarding testing of 
a K3 with the new synthesizer performed by Rob Sherwood, NC0B.

* * *

Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 when using 
the new synthesizer?

A: Our tests show in excess of 105 dB with the narrowest filters, though there 
are many factors, and this should be considered approximate. (A very robust 
test setup is required to make these measurements.) Rob Sherwood tested a K3 
with a KSYN3A and obtained the following results:

    2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
    2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB

Rob will be posting this information in his receiver performance chart 
(http://www.sherweng.com/table.html) after he completes his full suite of tests.

* * *

The above numbers were used with Rob's permission.

73,
Wayne
N6KR

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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Jim Brown]

On Fri,2/13/2015 4:19 PM, Johnny Siu wrote:

Again, IC7850 is known foir extremely low phase noise.


Is it known for it's low phase noise on TX?

73, Jim K9YC
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Re: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Don Wilhelm]

Johnny,

Hopefully I can simplify it a bit given your example.
That S9+60dB signal will have a weaker response in your receiver *if* 
your receiver was the limiting factor.  If the transmitter phase noise 
(splatter and other 'bad stuff' was the original problem, then you may 
or may not have any improvement for that example.


In other words, you will notice an improvement if other signals on the 
band are relatively clean.  The improvement when other signals on the 
band are not clean will not be as obvious.


Actually if an S9+60dB signal 10 kHz away is going to give you problems, 
then that signal is coming from a 'dirty transmitter'.  I think a better 
example would be -- If you can operate within 2 kHz of a strong signal 
with the current KSYN3, then the KSYN3A may be able to allow you to 
operate within 1.5 to 1.8 kHz of that same signal.  In other words, you 
will be able to "saddle up closer" to any signal unless the transmitter 
is creating trash.


Note: All numbers are for relative comparison only.  I pulled those 
numbers out of my head for illustration purposes only and do not 
represent any test data.  I have not seen nor used the KSYN3A.


73,
Don W3FPR

On 2/13/2015 7:19 PM, Johnny Siu wrote:

I must admit that understanding those figures are beyond my knowledge.  In 
practical terms, if I can now hear a below S1 cw weak signal 10KHz away from a 
S9+60db station before upgrade, what will be the improvement after the 
installation of KSYN3A assuming operating under the same condition?
Such a demonstation was given to me when I visited Icom HQ in Osaka last year 
in the announcement of the IC7850/IC7851.  Again, IC7850 is known foir 
extremely low phase noise.
Can any elecrafters interpret the improvements in an understandable layman 
terms?
73
Johnny VR2XMCK-Line + KX3 + HR50
寄件人︰ Wayne Burdick 
  收件人︰ Elecraft Reflector 
副本(CC)︰ "elecraft...@yahoogroups.com" 
  傳送日期︰ 2015年02月14日 (週六) 7:34 AM
  主題︰ [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

Hi all,


I've updated the KSYN3A FAQ with the following information regarding testing of 
a K3 with the new synthesizer performed by Rob Sherwood, NC0B.

* * *

Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 when using 
the new synthesizer?

A: Our tests show in excess of 105 dB with the narrowest filters, though there 
are many factors, and this should be considered approximate. (A very robust 
test setup is required to make these measurements.) Rob Sherwood tested a K3 
with a KSYN3A and obtained the following results:

 2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
 2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB

Rob will be posting this information in his receiver performance chart 
(http://www.sherweng.com/table.html) after he completes his full suite of tests.

* * *

The above numbers were used with Rob's permission.

73,
Wayne
N6KR

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