Fwd: PS: [Elecraft] Homebrew un-mod kit

[JEAN-FRANCOIS MENARD]

Début du message réexpédié :

> De : JEAN-FRANCOIS MENARD <jfmenard at mac.com>
> Date : 10 août 2005 15:51:12 HAE
> À : Gary Hvizdak <garyhvizdak at cfl.rr.com>
> Cc : 'Ken Kaplan' <wb2art at arrl.net>
> Objet : Rép : PS: [Elecraft] Homebrew un-mod kit
>
>
> Once inserted properly, they are only 7/16" high. Except for those  
> built vertically, because they are not as large as the others, and  
> I want a short description on it also. But they can be fold in  
> almost in a half, because it is only the label the is higher than  
> 7/16'', no component is higher than 7/16".
>
> Stickers were been made with a P-Touch.
>
> First, I covered all jumpers with 1 turn of 3M electrical tape, and  
> also 1 turn for the sticker made with the P-Touch. I also add a few  
> micro drop of clear "fast dry" glue to firmly hold the tape and  
> sticker to the plastic header. Because when you want to remove the  
> jumper, you must firmly pull the jumper off... so the glue make  
> sure that everything stay together. ;-)
>
>
> Le 05-08-10 à 15:04, Gary Hvizdak a écrit :
>
>
>> Hi Jean-François,
>>
>>     One more thing.  I like that your headers are labeled better  
>> than the
>> one's that Mark had originally described.
>>
>>     However, this brings up a curious question.  Do they fit with  
>> the cover
>> on and either a KPA-100 or KBT2 in installed the lid?  If so, how  
>> much
>> clearance do they leave?
>>
>>     This sort of information would be useful to others who might be
>> considering your approach.
>>
>> 73,
>> Gary, KI4GGX
>> K2 #4067
>>
>>
>> -----Original Message-----
>> From: Gary Hvizdak [mailto:garyhvizdak at cfl.rr.com]
>> Sent: Wednesday 10 August 2005 1357
>> To: 'jfmenard at mac.com'
>> Cc: 'elecraft at mailman.qth.net'
>> Subject: [Elecraft] Homebrew un-mod kit
>>
>> Hi Jean-François,
>>
>>     As a follow up to your post this morning, did you used the  
>> correct value
>> for the resistor on the output leg of your UN-KNB2 header?  This  
>> resistor
>> should be 560 ohms.  If you built yours using the information in our
>> preliminary User's Guide, or the recently posted / updated  
>> schematics now on
>> our homepage, then you would have used the correct value.
>>
>>     However, if you followed the instructions in Mark Dulecy's  
>> original
>> article (hosted by W5BIG), then you may have used a 470 ohm  
>> resistor in
>> error.  Whereas your receiver will still function, the wrong  
>> resistor value
>> results in a 5 db attenuator with a somewhat lower output  
>> impedance than the
>> intended 150 ohms.  It is possible that the resulting impedance  
>> mismatch
>> could cause some intermodulation distortion in your receiver.
>>
>>     See the following links for more on this subject ...
>>
>>
>> http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-04/ 
>> msg00148.html
>>
>>         http://home.cfl.rr.com/garyhvizdak/KI4GGX/unpcbs.htm#Guide
>>
>>         http://groups.yahoo.com/group/unpcbs/
>>
>>     With regard to the second link, check out our updated UN-KNB2  
>> schematic
>> by scrolling down to the fifth diagram.  It shows the KNB2 supplied
>> replacement 2.7 k ohm RF-R88 which is in parallel with the output leg
>> resistor on your header.  This explains why the output resistor  
>> should be
>> 560 rather than 470 ohms.
>>
>>     Very soon we will replace the five individual diagrams on our  
>> homepage
>> with a single hybrid schematic / block diagram showing a "big  
>> picture" view
>> of the K2, and the relationship between each of the un-modules.  This
>> diagram will be included in our updated User's Guide which will be  
>> released
>> in just a few days.
>>
>>     Please note that our homepage is continually being updated, so  
>> it is
>> likely that second link (above) will not be supported  
>> indefinitely.  One
>> link that will be, is the third link to our Yahoo group unpcbs  
>> website.
>>
>> 73,
>> Gary, KI4GGX
>> K2 #4067
>>
>> P.S. To all of you who have already placed an order for our kit,  
>> we are on
>> track to begin shipping by Monday August 22nd and possibly even  
>> sooner.  If
>> you are one of the few who pre-ordered but haven't yet followed up  
>> with your
>> payment, please do so by August 15th to ensure that you can still  
>> get a kit
>> from our first production run.
>>
>>
>>
>
> ======
>
> Jean-François Ménard / VA2VYZ
>
> ======
>
>
>

======

Jean-François Ménard / VA2VYZ

======