Noisy K-3 Receiver

[RLVZ]

Hi Guys,

I'd appreciate your thoughts as to why my K-3 receiver is so noisy.  I'd
really like to make this radio perform.  The radio is Serial #603F (factory
model) running 1.2.10.27.  I purchased the unit from the original owner a
couple of months ago so I don't know if it's always been this noisy but I do
know it was the same before I  recently updated software to 1.2.10.27.   The
radio is in immaculate condition and was never used mobile or bounced around.  
(it's a beautiful radio that looks like new!)

I say the receiver is noisy based upon listening to dozens of different
signals on: 40/20/15 m. and by doing numerous A/B comparison tests.  The
comparison tests were done with the K-3 Pre-Amp turned Off.  (and tried with ATT
on and off but mostly on to reduce noise).  

Radio 1: Yaesu FT-1000-MP w/AF Mod.  A signal is peaking S-8 and with the
no signal noise level is averaging S-1.  Therefore, the signal is peaking
aprx. 7 s-units above the noise based upon the MP s-meter and the signal sounds
loud and is way above the noise level.  Now I switch to the K-3:

Radio 2: K-3 tuned to the same signal with PreAmp Off and is peaking S-7
but the no signal noise level is noisy S-4 to S-5.  Therefore, the signal is
peaking only about 2 or 3 s-units above the noise level based upon the K-3
s-meter.  The result is that the MP has aprx. a 4 s-unit  S/N ratio advantage.


Thoughts: I realize that all s-meters read differently and the fact that
the MP s-meter shows a 4 s-unit stronger signal above the noise level  doesn't
mean alot.  But the fact is that the signal on the MP sounds MUCH louder
with alot more headroom above the noise level.  The K-3 receiver sounds so
noisy even with the S-7 signal that it isn't enjoyable listening to and that's
why I ran the comparisons because I couldn't stand all the noise.  Switching
on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the
signal still sounds noisy compared to the MP.  

Based upon "Reviews" of the K-3 I believe that I must have an unusual "K-3
noisy receiver" problem.

I'd sure appreciate your ideas on how I can get a better S/N ratio on my
K-3.      

Thanks!

73,
Dick- K9OM

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[Julian, G4ILO]

RLVZ wrote

Hi Guys,

I'd appreciate your thoughts as to why my K-3 receiver is so noisy.  I'd
really like to make this radio perform.  The radio is Serial #603F (factory
model) running 1.2.10.27.  I purchased the unit from the original owner a
couple of months ago so I don't know if it's always been this noisy but I do
know it was the same before I  recently updated software to 1.2.10.27.   The
radio is in immaculate condition and was never used mobile or bounced around.  
(it's a beautiful radio that looks like new!)

I say the receiver is noisy based upon listening to dozens of different
signals on: 40/20/15 m. and by doing numerous A/B comparison tests.  The
comparison tests were done with the K-3 Pre-Amp turned Off.  (and tried with ATT
on and off but mostly on to reduce noise).  

Radio 1: Yaesu FT-1000-MP w/AF Mod.  A signal is peaking S-8 and with the
no signal noise level is averaging S-1.  Therefore, the signal is peaking
aprx. 7 s-units above the noise based upon the MP s-meter and the signal sounds
loud and is way above the noise level.  Now I switch to the K-3:

Radio 2: K-3 tuned to the same signal with PreAmp Off and is peaking S-7
but the no signal noise level is noisy S-4 to S-5.  Therefore, the signal is
peaking only about 2 or 3 s-units above the noise level based upon the K-3
s-meter.  The result is that the MP has aprx. a 4 s-unit  S/N ratio advantage.


Thoughts: I realize that all s-meters read differently and the fact that
the MP s-meter shows a 4 s-unit stronger signal above the noise level  doesn't
mean alot.  But the fact is that the signal on the MP sounds MUCH louder
with alot more headroom above the noise level.  The K-3 receiver sounds so
noisy even with the S-7 signal that it isn't enjoyable listening to and that's
why I ran the comparisons because I couldn't stand all the noise.  Switching
on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the
signal still sounds noisy compared to the MP.  

Based upon "Reviews" of the K-3 I believe that I must have an unusual "K-3
noisy receiver" problem.

I'd sure appreciate your ideas on how I can get a better S/N ratio on my
K-3.      

Thanks!

Hi Dick.

I wonder if what you are experiencing is simply the result of your K3's S meter being adjusted to read high on noise, coupled with the fact that its calibration results in something close to the "standrard" 6dB per S-point?

I would suggest that you perform the S meter calibration procedure described in the manual.

I am not familiar with the FT-1000MP but with many radios the S meter basically reads the AGC voltage and it takes a significant signal to shift it at all after which it shoots up at about 2dB per S point until it reaches the S9 level.

[Enno, PF5X]

Hi Dick,

I have both a K3 and FT-1000MP. I agree that the K3 can have a somewhat noisy behaviour leading to listening fatigue. I have the impression that the various F/W versions in the past gave different AGC behaviour influencing the "noisiness". I played quite a while with the AGC SLP and AGC THR parameters in the config menu (TECH MODE ON !!).

I am not behind the rig right now, but I remember decreasing the SLP and increasing the THR parameter tend to give a more old-fashioned "analog" listening experience. If you play a bit with these parameters you'll find out whether you can make your K3 sound more to your linking.

In any case, on the weak signal side I can hear equally well on both radios. On the loud signal/crowded band side the K3 is much better, also due to the fact that I have both 500 and 250Hz roofing filters (which I let kick in at 650 and 350Hz respectively, something I can recommend to everyone to try).

-- Enno, PF5X
K3 #1263

RLVZ wrote

Hi Guys,

I'd appreciate your thoughts as to why my K-3 receiver is so noisy.  I'd
really like to make this radio perform.  The radio is Serial #603F (factory
model) running 1.2.10.27.  I purchased the unit from the original owner a
couple of months ago so I don't know if it's always been this noisy but I do
know it was the same before I  recently updated software to 1.2.10.27.   The
radio is in immaculate condition and was never used mobile or bounced around.  
(it's a beautiful radio that looks like new!)

I say the receiver is noisy based upon listening to dozens of different
signals on: 40/20/15 m. and by doing numerous A/B comparison tests.  The
comparison tests were done with the K-3 Pre-Amp turned Off.  (and tried with ATT
on and off but mostly on to reduce noise).  

Radio 1: Yaesu FT-1000-MP w/AF Mod.  A signal is peaking S-8 and with the
no signal noise level is averaging S-1.  Therefore, the signal is peaking
aprx. 7 s-units above the noise based upon the MP s-meter and the signal sounds
loud and is way above the noise level.  Now I switch to the K-3:

Radio 2: K-3 tuned to the same signal with PreAmp Off and is peaking S-7
but the no signal noise level is noisy S-4 to S-5.  Therefore, the signal is
peaking only about 2 or 3 s-units above the noise level based upon the K-3
s-meter.  The result is that the MP has aprx. a 4 s-unit  S/N ratio advantage.


Thoughts: I realize that all s-meters read differently and the fact that
the MP s-meter shows a 4 s-unit stronger signal above the noise level  doesn't
mean alot.  But the fact is that the signal on the MP sounds MUCH louder
with alot more headroom above the noise level.  The K-3 receiver sounds so
noisy even with the S-7 signal that it isn't enjoyable listening to and that's
why I ran the comparisons because I couldn't stand all the noise.  Switching
on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the
signal still sounds noisy compared to the MP.  

Based upon "Reviews" of the K-3 I believe that I must have an unusual "K-3
noisy receiver" problem.

I'd sure appreciate your ideas on how I can get a better S/N ratio on my
K-3.      

Thanks!

73,
Dick- K9OM

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[Arie Kleingeld PA3A-2]

Dick,

You are right about the s-meter of the FT1K. Under S8 it cannot be trusted.
That is a fact. When I measured this on my MP a signal drop op 3 s-points
resulted in going from s8 to s1 or so on the meter, so that's about the same
as you see with yours.

About the noise, I have done a comparison this morning.
Both rigs sound different but my impression is that the rigs hear equally
well.
With the K3 on default settings, its produces a sound that I do not like. I
tailored the RX audio with the RX-equalizer and it sounds more pleasant to
my ears now. Setting the IF filtering takes care of the rest.

Try playing around with those tools and see (hear) what you get then.

73
Arie PA3A

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[Val-12]

> With the K3 on default settings, its produces a sound that I do not like.
> I
> tailored the RX audio with the RX-equalizer and it sounds more pleasant to
> my ears now. Setting the IF filtering takes care of the rest.

Yes, the equalizer is a kind of remedy, but how about an embedded variable
AF filter, tracking the width of the IF DSP filter?

73 Val LZ1VB

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[Bill W4ZV]

>>>Thoughts: I realize that all s-meters read differently and the fact that
the MP s-meter shows a 4 s-unit stronger signal above the noise level  doesn't
mean alot.  

Correct, 4 S-units on an MP meter at that level is probably more like 2 real S-units (10-12 dB).  See below:

http://www.mail-archive.com/[e-mail]/msg63910.html

>>>But the fact is that the signal on the MP sounds MUCH louder
with alot more headroom above the noise level.  The K-3 receiver sounds so
noisy even with the S-7 signal that it isn't enjoyable listening to and that's
why I ran the comparisons because I couldn't stand all the noise.  Switching
on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the
signal still sounds noisy compared to the MP.

CONFIG: AGC THR may be set too high.  Try a lower setting.

Also, for a given band/antenna combination, set ATT ON>ATT OFF>PRE ON in that order and stop when connecting the antenna gives you band noise (i.e. don't use any more gain than necessary).  This ensures you are not wasting dynamic range by setting the noise floor correctly.  After doing this, I set my AF GAIN knob to about 9-10 o'clock (for headphones) and adjust RF GAIN back for a comfortable volume.  If you run RF GAIN wide open the receiver will sound noisy and you are limiting your dynamic range.

73,  Bill

[Mike Reublin]

Dick -
You said "running 1.2.10.27". That is the version number of the utility
program used to load the firmware into the K3(among other things) , not
what the K3 is running
. The version of that would be more relevant to this discussion. The
current version is 3.68.

73, Mike NF4L

[hidden email] wrote:

> Hi Guys,
>
> I'd appreciate your thoughts as to why my K-3 receiver is so noisy.  I'd
> really like to make this radio perform.  The radio is Serial #603F (factory
> model) running 1.2.10.27.  I purchased the unit from the original owner a
> couple of months ago so I don't know if it's always been this noisy but I do
> know it was the same before I  recently updated software to 1.2.10.27.   The
> radio is in immaculate condition and was never used mobile or bounced around.  
> (it's a beautiful radio that looks like new!)
>
> I say the receiver is noisy based upon listening to dozens of different
> signals on: 40/20/15 m. and by doing numerous A/B comparison tests.  The
> comparison tests were done with the K-3 Pre-Amp turned Off.  (and tried with ATT
> on and off but mostly on to reduce noise).  
>
> Radio 1: Yaesu FT-1000-MP w/AF Mod.  A signal is peaking S-8 and with the
> no signal noise level is averaging S-1.  Therefore, the signal is peaking
> aprx. 7 s-units above the noise based upon the MP s-meter and the signal sounds
> loud and is way above the noise level.  Now I switch to the K-3:
>
> Radio 2: K-3 tuned to the same signal with PreAmp Off and is peaking S-7
> but the no signal noise level is noisy S-4 to S-5.  Therefore, the signal is
> peaking only about 2 or 3 s-units above the noise level based upon the K-3
> s-meter.  The result is that the MP has aprx. a 4 s-unit  S/N ratio advantage.
>
>
> Thoughts: I realize that all s-meters read differently and the fact that
> the MP s-meter shows a 4 s-unit stronger signal above the noise level  doesn't
> mean alot.  But the fact is that the signal on the MP sounds MUCH louder
> with alot more headroom above the noise level.  The K-3 receiver sounds so
> noisy even with the S-7 signal that it isn't enjoyable listening to and that's
> why I ran the comparisons because I couldn't stand all the noise.  Switching
> on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the
> signal still sounds noisy compared to the MP.  
>
> Based upon "Reviews" of the K-3 I believe that I must have an unusual "K-3
> noisy receiver" problem.
>
> I'd sure appreciate your ideas on how I can get a better S/N ratio on my
> K-3.      
>
> Thanks!
>
> 73,
> Dick- K9OM
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>  

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[KK7P]

> Yes, the equalizer is a kind of remedy, but how about an embedded variable
> AF filter, tracking the width of the IF DSP filter?
>  

That has always been the case in the K3.  More specifically, the IF and
AF filters track in CW, SSB and DATA modes.  In AM mode there is a
defined relationship, but it is not 1:1.  In FM mode the AF filter is
not adjustable.

73,

Lyle KK7P
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[Mike Harris]

G'day,

The simple fact is that the faithful will always suggest that the K3
hears more, is more sensitive or is more transparent to band noise
etc etc.  Also you have to fiddle with the AGC, PRE, ATT and RF gain
whereas other radios just sound nicer out of the box.  I don't have
a problem with fiddling with AGC and equaliser parameters to tailor
the receive to my liking, but to have to do it to make it sound
acceptable is another thing altogether.

There is an often referred to AF filter module which installs on the
main DSP board and apparently cuts out a lot of unnecessary high
frequency audio.  Sadly though often referred to it just isn't being
made available despite very positive comment from some of those who
have field tested it.

The KAF2 filter for the K2 made all the difference in the world to
listening to SSB.

Regards,

Mike VP8NO

----- Original Message -----
From: "Bill W4ZV" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, December 16, 2009 9:26 AM
Subject: Re: [Elecraft] Noisy K-3 Receiver

>
>
>>>>Thoughts: I realize that all s-meters read differently and the
>>>>fact that
> the MP s-meter shows a 4 s-unit stronger signal above the noise
> level
> doesn't
> mean alot.
>
> Correct, 4 S-units on an MP meter at that level is probably more
> like 2 real
> S-units (10-12 dB).  See below:
>
> http://www.mail-archive.com/elecraft@.../msg63910.html
>
>>>>But the fact is that the signal on the MP sounds MUCH louder
> with alot more headroom above the noise level.  The K-3 receiver
> sounds so
> noisy even with the S-7 signal that it isn't enjoyable listening
> to and
> that's
> why I ran the comparisons because I couldn't stand all the noise.
> Switching
> on the K-3's NR, ATT, and/or adjusting the RF Gain does help some
> but the
> signal still sounds noisy compared to the MP.
>
> CONFIG: AGC THR may be set too high.  Try a lower setting.
>
> Also, for a given band/antenna combination, set ATT ON>ATT OFF>PRE
> ON in
> that order and stop when connecting the antenna gives you band
> noise (i.e.
> don't use any more gain than necessary).  This ensures you are not
> wasting
> dynamic range by setting the noise floor correctly.  After doing
> this, I set
> my AF GAIN knob to about 9-10 o'clock (for headphones) and adjust
> RF GAIN
> back for a comfortable volume.  If you run RF GAIN wide open the
> receiver
> will sound noisy and you are limiting your dynamic range.
>
> 73,  Bill

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[P.B. Christensen]

> CONFIG: AGC THR may be set too high.  Try a lower setting.

I agree with Bill.  He may also want to experiment with other AGC settings
like AGC-F, AGC-S, AGC SLP and AGC HLD and AGC DCY.

I found exactly what was described until I changed the AGC threshold/slope
and equally important, the AGC recovery times to less aggressive values.   I
suspect that aggressive AGC values (even in default) may be causing the
perceived increase in noise.

He may want to prove to himself that the K3 is quite listenable with
substantial audio dynamic range by changing to less aggressive AGC values.
Then, increase accordingly.  The default values are specified in the owner's
manual so there's always the ability to re-set values if originals are
forgotten.  My AGC recovery times are set for minimum and for me, that's
adequate, even under the fast setting.

On some professional DSP-based audio processors, manufacturers have taken
all the processing values, combined them into a single "less/more" virtual
control so that all processing parameters work in tandem with each other.
This works well for the person first opening the box and having a single
control to get you 90% of the way there.  Then, optimize the individual
controls to best match various operating conditions.   In the case of the
K3, that's something like 8 menu controls dedicated to AGC, including the AF
limiter function.  Not everyone who purchases a transceiver is adept at AGC
management.

Paul, W9AC



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[KK7P]

> There is an often referred to AF filter module which installs on the
> main DSP board ...

My understanding is that this is part of the DSP board swap upgrade,  
and is in currently shipping K3s.

But I've been known to be wrong!

73,

Lyle KK7P
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[Mike Harris]

G'day Lyle,

Interesting news.  I will discover if this is so in the next couple
of weeks, the new DSP board is in the post.

Regards,

Mike VP8NO

----- Original Message -----
From: "Lyle Johnson" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, December 16, 2009 2:45 PM
Subject: Re: [Elecraft] Noisy K-3 Receiver

>
>> There is an often referred to AF filter module which installs on
>> the
>> main DSP board ...
>
> My understanding is that this is part of the DSP board swap
> upgrade,
> and is in currently shipping K3s.
>
> But I've been known to be wrong!
>
> 73,
>
> Lyle KK7P

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[Eric NO3M]

Is this absolutely certain or not??

73 - no3m

Mike Harris wrote:

> G'day Lyle,
>
> Interesting news.  I will discover if this is so in the next couple
> of weeks, the new DSP board is in the post.
>
> Regards,
>
> Mike VP8NO
>
> ----- Original Message -----
> From: "Lyle Johnson" <[hidden email]>
> To: <[hidden email]>
> Sent: Wednesday, December 16, 2009 2:45 PM
> Subject: Re: [Elecraft] Noisy K-3 Receiver
>
>
>  
>>> There is an often referred to AF filter module which installs on
>>> the
>>> main DSP board ...
>>>      
>> My understanding is that this is part of the DSP board swap
>> upgrade,
>> and is in currently shipping K3s.
>>
>> But I've been known to be wrong!
>>
>> 73,
>>
>> Lyle KK7P
>>    
>
> ______________________________________________________________
> Elecraft mailing list
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>  

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[Steve Ellington]

I'm waiting on my new DSP board to arrive and HOPE it has that filter module
installed. Last time I checked, there was a 2 week delay on shipping.

Steve
N4LQ
[hidden email]
----- Original Message -----
From: "Lyle Johnson" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, December 16, 2009 12:45 PM
Subject: Re: [Elecraft] Noisy K-3 Receiver

>
>> There is an often referred to AF filter module which installs on the
>> main DSP board ...
>
> My understanding is that this is part of the DSP board swap upgrade,
> and is in currently shipping K3s.
>
> But I've been known to be wrong!
>
> 73,
>
> Lyle KK7P
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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--------------------------------------------------------------------------------



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[Rich]

Dick:

You gave us the version of the K3 Utility. What version of firmware is in the K3.  You will need to have the K3 Utility on and the K3 on with the pc connected to the K3.  It should then show up in the tab for "firmware" below the section labeled Firmware version. Click on "Check Versions Now"  If you see dashes in "Installed.. " column your PC is not talking to the K3.  If much lower than 3.xx it is way out of date.  Present version is 3.68. Click on "Send all Firmware to K3"  if the K3 utility shows less than 3.68 installed.

You can also determine the version of the K3 Firmware by holding down the "MENU" button (CONFIG) on the K3 and selecting FW REVS with the "B" VFO knob. You may need to also rotate the "A" VFO knob to select uC so that it shows the main microprocessor FW version.


KE0X

RLVZ wrote

Hi Guys,

I'd appreciate your thoughts as to why my K-3 receiver is so noisy.  I'd
really like to make this radio perform.  The radio is Serial #603F (factory
model) running 1.2.10.27.  I purchased the unit from the original owner a
couple of months ago so I don't know if it's always been this noisy but I do
know it was the same before I  recently updated software to 1.2.10.27.   The
radio is in immaculate condition and was never used mobile or bounced around.  
(it's a beautiful radio that looks like new!)

I say the receiver is noisy based upon listening to dozens of different
signals on: 40/20/15 m. and by doing numerous A/B comparison tests.  The
comparison tests were done with the K-3 Pre-Amp turned Off.  (and tried with ATT
on and off but mostly on to reduce noise).  

Radio 1: Yaesu FT-1000-MP w/AF Mod.  A signal is peaking S-8 and with the
no signal noise level is averaging S-1.  Therefore, the signal is peaking
aprx. 7 s-units above the noise based upon the MP s-meter and the signal sounds
loud and is way above the noise level.  Now I switch to the K-3:

Radio 2: K-3 tuned to the same signal with PreAmp Off and is peaking S-7
but the no signal noise level is noisy S-4 to S-5.  Therefore, the signal is
peaking only about 2 or 3 s-units above the noise level based upon the K-3
s-meter.  The result is that the MP has aprx. a 4 s-unit  S/N ratio advantage.


Thoughts: I realize that all s-meters read differently and the fact that
the MP s-meter shows a 4 s-unit stronger signal above the noise level  doesn't
mean alot.  But the fact is that the signal on the MP sounds MUCH louder
with alot more headroom above the noise level.  The K-3 receiver sounds so
noisy even with the S-7 signal that it isn't enjoyable listening to and that's
why I ran the comparisons because I couldn't stand all the noise.  Switching
on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the
signal still sounds noisy compared to the MP.  

Based upon "Reviews" of the K-3 I believe that I must have an unusual "K-3
noisy receiver" problem.

I'd sure appreciate your ideas on how I can get a better S/N ratio on my
K-3.      

Thanks!

73,
Dick- K9OM

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[Mike Reublin]

Any idea what serial number the upgrade started shipping with? Or a way
to determine if I have it already?

Thanks,
Mike NF4L

Lyle Johnson wrote:

>> There is an often referred to AF filter module which installs on the
>> main DSP board ...
>>    
>
> My understanding is that this is part of the DSP board swap upgrade,  
> and is in currently shipping K3s.
>
> But I've been known to be wrong!
>
> 73,
>
> Lyle KK7P
> ______________________________________________________________
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>  

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[Greg - AB7R]

One of my K3s is #3459 and it has the updated DSP board.  I think it was right
around there when they started.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Wed Dec 16 14:36 , Mike  sent:

>Any idea what serial number the upgrade started shipping with? Or a way
>to determine if I have it already?
>
>Thanks,
>Mike NF4L
>
>Lyle Johnson wrote:
>>> There is an often referred to AF filter module which installs on the
>>> main DSP board ...
>>>    
>>
>> My understanding is that this is part of the DSP board swap upgrade,  
>> and is in currently shipping K3s.
>>
>> But I've been known to be wrong!
>>
>> 73,
>>
>> Lyle KK7P
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: [hidden email]','','','')">[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>  
>
>
>______________________________________________________________
>Elecraft mailing list
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[Mike Reublin]

Thanks Greg -
Mine is 3539. There's a post on down the list that gives a link to a pic
of the rev. C board.

73, Mike
Greg - AB7R wrote:

> One of my K3s is #3459 and it has the updated DSP board.  I think it was right
>
> around there when they started.
>
>
>
> -------------------------
>
> 73,
>
> Greg - AB7R
>
> Whidbey Island WA
>
> NA-065
>
>
>
>
>
> On Wed Dec 16 14:36 , Mike  sent:
>
>
>
>  
>> Any idea what serial number the upgrade started shipping with? Or a way
>>    
>
>  
>> to determine if I have it already?
>>    

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[Merv Schweigert]

Thanks for the info,  last I had heard the board was not part of the new
DSP
board,  but that was last month.  I placed an order Nov 25 and have not
heard
a peep as yet about shipping or backorder or??  figured they were behind in
shipping.
73 Merv KH7C

> I'm waiting on my new DSP board to arrive and HOPE it has that filter module
> installed. Last time I checked, there was a 2 week delay on shipping.
>
> Steve
> N4LQ
> [hidden email]
> ----- Original Message -----
> From: "Lyle Johnson" <[hidden email]>
> To: <[hidden email]>
> Sent: Wednesday, December 16, 2009 12:45 PM
> Subject: Re: [Elecraft] Noisy K-3 Receiver
>
>
>  
>>> There is an often referred to AF filter module which installs on the
>>> main DSP board ...
>>>      
>> My understanding is that this is part of the DSP board swap upgrade,
>> and is in currently shipping K3s.
>>
>> But I've been known to be wrong!
>>
>> 73,
>>
>> Lyle KK7P
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>    
>
>
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>
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>  

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[Mike K2MK]

I would like to hear more about the AF Filter Module. I didn't have any
initial interest in the DSP board upgrade but maybe I would reconsider if I
knew what the AF Filter Module did. Maybe someone who has upgraded could
comment.

73,
Mike K2MK



Lyle Johnson
Wed, 16 Dec 2009 09:45:58 -0800

> There is an often referred to AF filter module which installs on the
> main DSP board ...

My understanding is that this is part of the DSP board swap upgrade,
and is in currently shipping K3s.

But I've been known to be wrong!

73,

Lyle KK7P

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