Hello John,
Thanks for your comments and I understand what you would like to express.
However, I agree with the previous writer, VE7XF, that Elecraft should tell us
the difference of DSP Rev D before Vs after modification. All the information
is just piece meal and scattered among emails and Elecraft website.
I know it must be good, otherwise, no modification is required.
However, Elecraft should tell me how good it will be, BDR, MDS ??? Of course,
I owned a K3 and still have a K2, I understand the continuous improvement of
Elecraft products. Again, as a customer, I still like to know what benefit I
shall get from the DSP Rev D modification.
Similar to every firmware upgrade, Elecraft gives a brief description of the
improved areas. So, why should they not do the same for the DSP Rev D
modification?
The answer to my questions in my previous email should be simple and will only
take Elecraft a few minutes to address them. They are the designers and well
known why modifications are required and what benefits can be achieved.
I am not a radio man by profession and really want to learn more radio
knowledge from them so as to educate myself.
73 & HNY
Johnny Siu VR2XMC
----- 郵件原件 ----
寄件人﹕ juergen <plebia...@yahoo.com>
收件人﹕ Elecraft@mailman.qth.net
傳送日期﹕ 2010/1/1 (五) 6:47:37 PM
主題： Re: [Elecraft] Re： K3 DIY DSP Rev D - please elaborate
Hi Johnny
I have seen many subtle improvements in the K3's receiver with the many
successive firmware upgrades. There is no supporting documentary evidence from
Elecraft for these subtle changes or improvements that I have noticed.
I have worn out a coaxial switch comparing and testing K3's to other radios.
When you have access to as many K3's as I do, all with different serial
numbers with which you can play with, upgrade and compare. They belong to my
radio club BTW.. The improvements that I am seeing is not entirely in my
imagination. I am sure that many of the improvements comes about because of
better DSP techniques and algorithms thats implemented and not mentioned by
Elecraft.
SDR techniques and how they are applied to an individual product is not an
exact science. I am sure Elecraft has developed many of its own techniques and
algorithms for its DSP library. These will never ever be revealed or
discussed as its their intellectual property.
I own a Watkins Johnson HF1000 and it was returned several times to their
factory for updates. The receiver would return and the DSP and receiver would
be magically better. When I discussed this once on the phone with one of their
engineers, his comments were that that they were improving and tesing new DSP
techniques all the time. His comments were also that these would never be
discussed nor would the information ever be released to the public. I am sure
its the same with Elecraft.
Another product like this with propriety DSP techniques is the Perseus, I am
sure that there are many who would like to get their hands on some of Niko's
code. I had the opportunity to compare a Rohde-Schwarz DSP receiver to the
Perseus, and let me tell you that the Perseus was a lot better. Now if a
company like Rohde-Schwarz cant beat a one man show like Microtelecom it
tells you that DSP programming is not as straightforward as many want you to
believe especially when it applies to HF receivers.
I think the best bet is to keep your K3 updated with all the mods and
upgrades. You will be getting many things for free thats not even mentioned.
The small price for the DSP upgrade is minimal compared to what other companies
would be charging you for a similar upgrade, thats if you would even get such
an opportunity. Certainly if it came from Yaesu or Icom you would have to ship
the radio back to the factory. Look at the costly exercise that FT9000 owners
went through for the PEP and factory upgrade program. By all accounts that
transformed the FT9000 into a new radio.
If you own a K3, the ticket price for continual improvement is beer money.
While I have to also pay expensive shipping, I still consider it to be
cheap way out for a better product in the end analysis. I certainly will be
trying and upgrading all our clubs K3's with the upgraded DSP board.
73
John
--- On Fri, 1/1/10, Johnny Siu <vr2...@yahoo.com.hk> wrote:
> From: Johnny Siu <vr2...@yahoo.com.hk>
> Subject: [Elecraft] Re： K3 DIY DSP Rev D - please elaborate
> To: "Ralph Parker" <ve...@dccnet.com>, Elecraft@mailman.qth.net
> Date: Friday, January 1, 2010, 1:38 AM
> Hello Ralph,
>
> Yes, good question.
>
> In fact, I really want to know:
>
> 1. Will there be any differences in the key RX
> specifications (i.e. BDR and MDS, survival among strong big
> guns) if DSP Rev D is installed?
>
> 2. From the bit and piece of information scattered among
> the emails in this forum and the Elecraft web pages, I have
> been given to understand that the modifications are related
> to the cut off point of the high end and extension of the
> low end of the audio specturm. Is my understanding
> correct?
>
> 3. If my understanding is correct, I suppose the TX and
> RX EQ in the menu of K3 can address the audio issue.
>
> 4. If my understanding is NOT correct, what is actual
> benefit of all those DSP board modification which cannot be
> addressed in the audio section i.e. TX and RX EQ?
>
> I think Elecraft should set out in a table in their website
> comparing the before Vs after modifications in terms
> of performance of K3. I agree with you that "It's really
> good - buy it." is not enough. I don't mind paying the
> extras for the modifications but need to know precisely what
> I am paying for.
>
> 73 & HNY,
>
> Johnny VR2XMC
>
>
>
> ----- 郵件原件 ----
> 寄件人﹕ Ralph Parker <ve...@dccnet.com>
> 收件人﹕ Elecraft@mailman.qth.net
> 傳送日期﹕ 2010/1/1 (五) 4:48:10 PM
> 主題： Re: [Elecraft] K3 DIY DSP Rev D - please
> elaborate
>
> >...so besides the LPF, what else is different on the
> DSP "D" board?
> >I don't think I've seen any elaboration anywhere.
>
> I've asked this question before with no answer so far.
> I'd like some kind of 'sales talk' so I know what I'm
> getting.
> "It's really good - buy it." is not enough.
>
> VE7XF
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