Début du message réexpédié :
De : JEAN-FRANCOIS MENARD <[EMAIL PROTECTED]>
Date : 10 août 2005 15:51:12 HAE
À : Gary Hvizdak <[EMAIL PROTECTED]>
Cc : 'Ken Kaplan' <[EMAIL PROTECTED]>
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:[EMAIL PROTECTED]
Sent: Wednesday 10 August 2005 1357
To: '[EMAIL PROTECTED]'
Cc: '[email protected]'
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
======
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