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K3 Rev C +AF filter

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rfenabled

K3 Rev C +AF filter

Well I for one missed the AF filter part of the DSP upgrade.

Not all K3 owners spend time on the internet and Elecraft web site in particular.

So if anyone does know exactly what the AF filter does to enhance the receiver DSP over that what we have prior to it's release, would certainly help those of us who are in two minds about spending money to improve a radio costing very close to 5 thousand dollars.

For those owners outside the US, ordering anything from Elecraft can become a considerable expense with shipping charges etc.

73's
Gary
Sent via BlackBerry® from Telstra
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Ian Maude

Re: K3 Rev C +AF filter

I sincerely hope that the small filter board will be available for those of
us without the newer DSP board. I will not be getting the newer board, I
can think of other things I would like to spend my money on than replacing a
perfectly good DSP board.

73 Ian

--
Ian J Maude, G0VGS
SysOp GB7MBC & HB9DRV-9 DX Clusters
Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
http://www.amateurradiotraining.org
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Bob Naumann W5OV

Re: K3 Rev C +AF filter

There seems to be a lack of understanding regarding the DSP upgrade. The
full price of the DSP board is $367.

Elecraft's upgrade deal is only $69.95 presuming you return the old DSP
board in 3 weeks to Elecraft.

This seems to be a reasonable price to bring the radio fully up to date.

73,

Bob W5OV

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Ian Maude
Sent: Thursday, December 17, 2009 4:13 AM
To: Elecraft List
Subject: Re: [Elecraft] K3 Rev C +AF filter

I sincerely hope that the small filter board will be available for those of
us without the newer DSP board. I will not be getting the newer board, I
can think of other things I would like to spend my money on than replacing a
perfectly good DSP board.

73 Ian

--
Ian J Maude, G0VGS
SysOp GB7MBC & HB9DRV-9 DX Clusters
Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
http://www.amateurradiotraining.org
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M0XDF

Re: K3 Rev C +AF filter

I'm not complaining about not updating and I think it's a reasonable
price, per-se. But add in the postage, customs handling (no duty) and
VAT, this gets a little steep over here and I can't really afford to
do that for some performance I might not miss.
YMMV
And I'm not suggesting this should be a free upgrade either.
However, I'll consider it when I purchase the P3.
73 de M0XDF, K3 #174
--
The universe is like a safe to which there is a combination. But the
combination is locked up in the safe.
-Peter De Vries, editor, novelist (1910-1993)

On 17 Dec 2009, at 10:51, Bob Naumann wrote:

> There seems to be a lack of understanding regarding the DSP upgrade.
> The
> full price of the DSP board is $367.
>
> Elecraft's upgrade deal is only $69.95 presuming you return the old
> DSP
> board in 3 weeks to Elecraft.
>
> This seems to be a reasonable price to bring the radio fully up to
> date.

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Ian Maude

Re: K3 Rev C +AF filter

In reply to this post by Bob Naumann W5OV

Just to make it clear, I am not unhappy with the way Elecraft do business.
Neither am I bothered about buying a small add-on board to improve my
reception. I am quite willing to pay for the small board but do not see why
I should have to pay £60-£70 (which it will be here after shipping and VAT
etc) for a replacement DSP board that I do not need.
So, is the add on audio filter board available to buy as a separate unit?

73 Ian

2009/12/17 Bob Naumann <[hidden email]>

> There seems to be a lack of understanding regarding the DSP upgrade. The
> full price of the DSP board is $367.
>
> Elecraft's upgrade deal is only $69.95 presuming you return the old DSP
> board in 3 weeks to Elecraft.
>
> This seems to be a reasonable price to bring the radio fully up to date.
>
> 73,
>
> Bob W5OV
>
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Ian Maude
> Sent: Thursday, December 17, 2009 4:13 AM
> To: Elecraft List
> Subject: Re: [Elecraft] K3 Rev C +AF filter
>
> I sincerely hope that the small filter board will be available for those of
> us without the newer DSP board. I will not be getting the newer board, I
> can think of other things I would like to spend my money on than replacing
> a
> perfectly good DSP board.
>
> 73 Ian
>
> --
> Ian J Maude, G0VGS
> SysOp GB7MBC & HB9DRV-9 DX Clusters
> Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
> http://www.amateurradiotraining.org
> ______________________________________________________________
> 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
>
>

Richard Squire - HB9ANM

Re: K3 Rev C +AF filter

In reply to this post by Bob Naumann W5OV

Thanks for the info. But since there is allegedly no such thing as a stupid question, may I ask whether only the main DSP board should be replaced.
How about the second DSP board for the SUB RX? No change?
BTW I'm quite happy with the RX EQ... But I may do the upgrade for the rig to be up to date.
tnx es 73
Richard

Bob Naumann wrote

There seems to be a lack of understanding regarding the DSP upgrade. The
full price of the DSP board is $367.

Elecraft's upgrade deal is only $69.95 presuming you return the old DSP
board in 3 weeks to Elecraft.

This seems to be a reasonable price to bring the radio fully up to date.

73,

Bob W5OV

Richard - HB9ANM

Julian, G4ILO

Re: K3 Rev C +AF filter

In reply to this post by Ian Maude

Ian Maude wrote

Just to make it clear, I am not unhappy with the way Elecraft do business.
Neither am I bothered about buying a small add-on board to improve my
reception. I am quite willing to pay for the small board but do not see why
I should have to pay £60-£70 (which it will be here after shipping and VAT
etc) for a replacement DSP board that I do not need.
So, is the add on audio filter board available to buy as a separate unit?

I can't find any mention (other than rumour) of an add-on board. But if such an add-on was designed to fit the new DSP board presumably it would not fit on to the old board.

The only benefit of the new DSP board as far as I can find out is extended bass response through the headphone socket. While that would be nice to have, like you I can't justify the cost (which I would expect to be more like £80-£90 once you add in the tax collection charge and sending back the old board.)

I don't see what purpose an audio filter board would serve, given that we have a crystal filter followed by DSP filtering and then RX equalization already. Any high frequencies that can get past that lot must be at a pretty low level already.

Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

Ken Kopp-3

K3 DSP board improvement(s)

Some may recall a problem with overheating / failure
of the audio IC on the DSP board when a mono plug
was plugged into the speaker jack, creating a short
on one side of the chip's output. I'm aware of several
chip failures ... including mine ... due to this "operator
error".

In conversation with Elecraft yesterday I learned that
the current DSP board has additional "land" on the
upper edge of the board that provides additional heat-
sinking for the audio chip.

73! Ken Kopp - K0PP
[hidden email]
http://tinyurl.com/7lm3m5
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Eric NO3M

Re: K3 Rev C +AF filter

In reply to this post by Julian, G4ILO

Julian, G4ILO wrote:
> I don't see what purpose an audio filter board would serve, given that we
> have a crystal filter followed by DSP filtering and then RX equalization
> already. Any high frequencies that can get past that lot must be at a pretty
> low level already.
>
>

At least from my perspective and hearing, this LPF module would knock
down and eliminate the 12 kHz related beat notes noticeable on CW.
Otherwise, I've had to drag around outboard audio filters + cabling,
etc. anytime I take the K3s anywhere to guest OP. I could have opted
for a passive filter and bastardized my headphones, but chose a pair of
AF-1 active filters until Elecraft had an "official" fix for the
problem. Therefore, the LPF module is not just an audiophile
enhancement, but hopefully a resolution to a real problem, at least for
those that have high frequency and sensitive hearing.

- no3m
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Joe Subich, W4TV-4

Re: K3 Rev C +AF filter

In reply to this post by Julian, G4ILO

> I don't see what purpose an audio filter board would serve,
> given that we have a crystal filter followed by DSP filtering
> and then RX equalization already. Any high frequencies that
> can get past that lot must be at a pretty low level already.

The add on audio filter board reduces (eliminates) clock
and audio image leakage from the DAC output. These are not
related to the DSP process but hardware artifacts.

I see several responses between 5 and 15 KHz although they
may be down 50 dB or more from the peak audio levels. Still,
they are as much as 15 or 20 dB above the noise floor above
4 KHz and this can make the K3's audio somewhat tiring when
listening to weak signals since these leakage signals do not
respond to the RX EQ or DSP.

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Julian, G4ILO
> Sent: Thursday, December 17, 2009 9:22 AM
> To: [hidden email]
> Subject: Re: [Elecraft] [K3] K3 Rev C +AF filter
>
>
>
>
>
> Ian Maude wrote:
> >
> > Just to make it clear, I am not unhappy with the way Elecraft do
> > business. Neither am I bothered about buying a small
> add-on board to
> > improve my reception. I am quite willing to pay for the
> small board
> > but do not see why I should have to pay £60-£70 (which it
> will be here
> > after shipping and VAT
> > etc) for a replacement DSP board that I do not need.
> > So, is the add on audio filter board available to buy as a separate
> > unit?
> >
> >
> I can't find any mention (other than rumour) of an add-on
> board. But if such an add-on was designed to fit the new DSP
> board presumably it would not fit on to the old board.
>
> The only benefit of the new DSP board as far as I can find
> out is extended bass response through the headphone socket.
> While that would be nice to have, like you I can't justify
> the cost (which I would expect to be more like £80-£90 once
> you add in the tax collection charge and sending back the old board.)
>
> I don't see what purpose an audio filter board would serve,
> given that we have a crystal filter followed by DSP filtering
> and then RX equalization already. Any high frequencies that
> can get past that lot must be at a pretty low level already.
>
> -----
> Julian, G4ILO. K2 #392 K3 #222.
> * G4ILO's Shack - http://www.g4ilo.com
> * KComm - http://www.g4ilo.com/kcomm.html
> * KTune - http://www.g4ilo.com/ktune.html
>

K2QI

Re: K3 Rev C +AF filter

In reply to this post by Richard Squire - HB9ANM

That's a good question, and something I'd like to know as well. I'm
assuming that in order to keep both receivers identical in performance, both
DSP boards will have to be swapped out. I'm also assuming that the
replacement cost will be doubled. Please correct me if I'm mistaken.

Cheers,
James K2QI

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Richard Squire -
HB9ANM
Sent: Thursday, December 17, 2009 7:24 AM
To: [hidden email]
Subject: Re: [Elecraft] [K3] K3 Rev C +AF filter

Thanks for the info. But since there is allegedly no such thing as a stupid
question, may I ask whether only the main DSP board should be replaced.
How about the second DSP board for the SUB RX? No change?
BTW I'm quite happy with the RX EQ... But I may do the upgrade for the rig
to be up to date.
tnx es 73
Richard

-----
Richard - HB9ANM

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--... ...-- -.. . .--- .- -- . ...

Bill W4ZV

Re: K3 Rev C +AF filter

K2QI wrote

That's a good question, and something I'd like to know as well. I'm
assuming that in order to keep both receivers identical in performance, both
DSP boards will have to be swapped out. I'm also assuming that the
replacement cost will be doubled. Please correct me if I'm mistaken.

You are mistaken...only the main DSP board needs to be changed.

73, Bill

P.B. Christensen

Re: K3 Rev C +AF filter

In reply to this post by K2QI

> Thanks for the info. But since there is allegedly no such thing as a
> stupid
> question, may I ask whether only the main DSP board should be replaced.

The Main DSP board routes the sub Rx audio and so, there's no reason for a
sub DSP board replacement.

Paul, W9AC

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K2QI

Re: K3 Rev C +AF filter

In reply to this post by Bill W4ZV

Hi Bill,

I'm sure I'm not grasping this concept well, but what about the sub receiver
then?

73 James

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bill W4ZV
Sent: Thursday, December 17, 2009 10:24 AM
To: [hidden email]
Subject: Re: [Elecraft] [K3] K3 Rev C +AF filter

K2QI wrote:
>
> That's a good question, and something I'd like to know as well. I'm
> assuming that in order to keep both receivers identical in performance,
> both
> DSP boards will have to be swapped out. I'm also assuming that the
> replacement cost will be doubled. Please correct me if I'm mistaken.
>

You are mistaken...only the main DSP board needs to be changed.

73, Bill

--
View this message in context:
http://n2.nabble.com/K3-Rev-C-AF-filter-tp4179228p4181774.html
Sent from the [K3] mailing list archive at Nabble.com.
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--... ...-- -.. . .--- .- -- . ...

hf4me

Re: K3 Rev C +AF filter

In reply to this post by P.B. Christensen

OK, that helps a lot. I thought I would have to buy TWO new dsp boards,
guess I missed any previous comments to the contrary.

Thanks, Jim KG0KP

----- Original Message -----
From: "Paul Christensen" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, December 17, 2009 9:24 AM
Subject: Re: [Elecraft] [K3] K3 Rev C +AF filter

>> Thanks for the info. But since there is allegedly no such thing as a
>> stupid
>> question, may I ask whether only the main DSP board should be replaced.
>
> The Main DSP board routes the sub Rx audio and so, there's no reason for a
> sub DSP board replacement.
>
> Paul, W9AC
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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>

Don Wilhelm-4

Re: K3 Rev C +AF filter

In reply to this post by K2QI

James,

The audio path for the sub is on the main DSP board - the change is not
in the DSP itself, but in the audio path.

73,
Don W3FPR

James Sarte wrote:

> Hi Bill,
>
> I'm sure I'm not grasping this concept well, but what about the sub receiver
> then?
>
> 73 James
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Bill W4ZV
> Sent: Thursday, December 17, 2009 10:24 AM
> To: [hidden email]
> Subject: Re: [Elecraft] [K3] K3 Rev C +AF filter
>
>
>
>
> K2QI wrote:
>
>> That's a good question, and something I'd like to know as well. I'm
>> assuming that in order to keep both receivers identical in performance,
>> both
>> DSP boards will have to be swapped out. I'm also assuming that the
>> replacement cost will be doubled. Please correct me if I'm mistaken.
>>
>>
>
> You are mistaken...only the main DSP board needs to be changed.
>
> 73, Bill
>
>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
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>

Corboy - Poteet

Re: K3 Rev C +AF filter

In reply to this post by Eric NO3M

Dick Dickinson

Re: K3 Rev C +AF filter

In reply to this post by rfenabled

One doesn't have to be a Hi-Fi enthusiast to be discomforted or fatigued by
distortion products and other artifacts, but perhaps being one is useful in
knowing the causes. Not perceiving these in the conscious mind or otherwise
quantifying or qualifying them does not mean that a person is unaffected by
them.

73,
Dick - KA5KKT

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