[Elecraft] P3 Broad Birdie & straw men...

Mon Jun 13 05:25:57 EDT 2011

Hello Om,

Although K3 comes with excellent specifications, the construction materials are fairly primitive . From my observation of other radios, there are not too many shielded metal boxes inside K3. Perhaps K3's small size gives some restrictions in design.  I prefer di-cast cases but the radio will be heavier.

Sent from my  iPhone 4

juergen <plebian99 at yahoo.com> 於 2011年6月13日 下午3:32 寫道：

> Hi Johnny
> 
> The OMNI6 had the same birdie problems. The birdie elimination routine is not all that effective and leaves holes in the band. I dont see how a more powerful DSP is going to help birdie  removal.
> 
> The best solution is a redesign of the boards with more shielding. The K3 is a very "open" design with regards to the internal shielding. When I added the second receiver I used some space blanket material that was grounded to the chasis, it did help a small amount.
> 
> Ten Tec did improve the shielding for the 10 meter birdie problem, however that was not very effective also. Most operators used  homebrew  shielding solutions using 3rd party shielding material. I used space blanket material which helped.
> 
> No Birdies will happen In the K4, I suppose. Birdie problems are too hard to fix after the design has been released. The K3 is what it is, I will just wait for the K4 or wait for some other brand of miracle radio. The openHPSDR Hermes is starting to look good!
> 
> This sunspot cycle looks like its going to  be a poor one.  I can ignore  the birdies on the higher  bands  by not using the radio, I wont be missing much. The K3 unfortunately needs the preamp to be  left on, on the higher bands which makes the birdies worst, especially with the P3. You cant win!
> 
> 73
> 
> Juergen
> 
> 
> 
> --- On Sun, 6/12/11, Johnny Siu <vr2xmc at yahoo.com.hk> wrote:
> 
>> From: Johnny Siu <vr2xmc at yahoo.com.hk>
>> Subject: [Elecraft] P3 Broad Birdie & straw men...
>> To: "jim at audiosystemsgroup.com" <jim at audiosystemsgroup.com>, "Reflector Elecraft" <elecraft at mailman.qth.net>
>> Date: Sunday, June 12, 2011, 11:44 PM
>> Hello Jim,
>>  
>> I fully appreciate the PITA and am annoyed about it.
>>  
>> The elimination of internal birdies require substantial
>> amount of DSP power.  In the circumstances, by taking
>> advantage of the module design of K3, a new more
>> powerful DSP board to replace the existing one may be the
>> ultimate solution in the future.  Of course, this will take
>> Elecraft some time to implement
>>  
>> At the current moment, I still feel that K3 is the
>> smallest portable high performance radio with true dual
>> receivers.  It will not be practical for me to take my
>> IC7800 easily to other QTH to operate.
>>  
>> I am going to do some IOTA operation this week end and
>> will bring my K3 with me.
>> 
>> TNX & 73,
>> 
>> 
>> Johnny VR2XMC
>> 
>> 從︰ Jim Brown <jim at audiosystemsgroup.com>
>> 收件人︰ Reflector Elecraft <elecraft at mailman.qth.net>
>> 傳送日期︰ 2011年06月13日 (週一) 1:25 PM
>> 主題︰ Re: [Elecraft] P3 Broad Birdie & straw
>> men...
>> 
>> I understand exactly what you are talking about -- my case
>> #2, but I 
>> also realized that what K3TUF and N6XI are talking about
>> was my case 
>> #1.  Your birdies and noise are from OUTSIDE the radio. 
>> Their's are 
>> only INSIDE the radio.  I experience both.
>> 
>> Notice that Phil says  "Must be on the IF because it is
>> never heard even 
>> when it is in the
>> apparent bandwidth window."
>> 
>> These INTERIOR birdies also get MUCH stronger when you have
>> the SUB RX 
>> turned on.  During the VHF contest, I split my time
>> between CW and SSB, 
>> with the SUB RX listening to whichever one I wasn't
>> transmitting on.  
>> The thing that's a PITA about this is that you think that
>> these are 
>> signals that you can work, so you switch from SSB to CW to
>> work them, 
>> but they aren't really there.  There are also some fairly
>> weak 
>> birdies/noise peaks that look like weak CW signals, but are
>> not.  And I 
>> worked nearly a dozen weak CW signals that looked like
>> those 
>> birdies/noise peaks, and as you tune to work them, they
>> also disappear.
>> 
>> 73, Jim K9YC
>> 
>> On 6/12/2011 6:34 PM, John Ragle wrote:
>>> second paragraph, and I believe the other posts are
>> talking about 
>>> exactly the same thing. If you will take the time to
>> read what they 
>>> wrote, you might recognize as much. Perhaps your
>> objection is to the 
>>> use of the word "birdie" in this context?
>> 
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