Dennis,
As Mark NK8Q has already mentioned a 1N4148 obtained from any source is
suitable. What surprises me is that D18 got fried in the first place if
everything else in the circuit is working properly. It might be wise to buy
some spare diodes in case the fault raises its ugly head again
Sverre:
Thanks for the historical FM interference research.
At the suggestion of Bob, N5BZ, I recently made some measurements of my
K2's sensitivity to responses of the form N*LO +/- 4915 KHz, via a short
piece of exposed coaxial cable (a BNC-to-binding post adapter at the end
of the cable),
Steve -
You should only have a great experience building
the Elecraft K2 Xcvr! Sounds like you have the
skills and kit interest - in doing a fine job.
You have no need for a Scope to complete one.
I built one in mid 2006, probably took me 4 weeks,
chunking along every day. My first
Hi Stephen,
I think you'll do just fine. The K2 is an excellent transceiver and
the build is straight forward and most enjoyable. Just follow the
manual and you'll be fine.
No test equipment is required to build the K2 other than a dmm and a
dummy load. You do need to take esd precautions
Hi all,
Well I have finally started looking for the fault on my SSB board after
about 9 months! For some reason I have no receive when the board is
plugged in. If I short out pins 1 and 3 of J9 and J10 I get receive no
problem, so it would appear to be a fault on the SSB board.
I have
Fred (FL) wrote:
Steve -
You should only have a great experience building
the Elecraft K2 Xcvr! Sounds like you have the
skills and kit interest - in doing a fine job.
You have no need for a Scope to complete one.
I built one in mid 2006, probably took me 4 weeks,
chunking along every
Jack, Sverre
Thanks for the feedback.
Although the waveform was a bit unexpected since it was of the proper
amplitude and fundamental I thought the IC was probably fine. The DC level
was also at 4v as expected.
The diodes are indeed driven solidly into conduction with the expected flat
tops
Hi to all on list,
Last weekend I went to a nice QTH out in the country, which belongs to a
friend, for the RSGB 80M AFS CW contest, here in the UK.
I had intended to use my K2 in the contest but S9+20db QRN from a
neighbouring farmer's electric fence put and end to that hope. Using the
KNB2's
Jim,
Did you order the KPA100 option? If so, there are 100 uH RF Chokes in that
kit that you can borrow until you receive the RFC13 replacement.
73,
Don W3FPR
-Original Message-
tops apparent. So it looks like everthing should be fine.
Eagerly awaiting the delivery of RFC13. I
Ian,
Have you tried checking the small toroid RF Chokes for shorts to the crystal
can? That is a common cause of the problem you describe. Just stick a
small piece of paper between the chokes and the crystal cans for a quick
check - if the receiver comes to life, rewind the chokes (being
No they have not. I spoke with Lisa on Friday, and I was her last order
of the day. On the shelf, she had serial numbers 5982, 5983, 5984, and
5985. Of which I took 5982. She said 6000 should be in the next
batch of kits that are put together.
David Wilburn
[EMAIL PROTECTED]
Darrell
Don Wilhelm wrote:
Ian,
Have you tried checking the small toroid RF Chokes for shorts to the crystal
can? That is a common cause of the problem you describe. Just stick a
small piece of paper between the chokes and the crystal cans for a quick
check - if the receiver comes to life, rewind the
Allan,
C11 controls the width of the NB1 gate and C12 changes the width of the NB2
gate. You may want to experiment with the values to find what will work
with your particular noise. I can't say if you will find any improvement.
The best help would be to ask permission from your neighbor to
I guess I should mention that this board has worked perfectly well
before it went deaf. I had tried some of Stewarts SSB mods and back
engineered them before it failed. I have checked and double checked all
the parts of the circuit I messed with though and all seems fine in that
area.
Ian
Allan Duncan wrote:
I see that on the LA3ZA modification pages there are some capacitor changes
that change the time constants in the KNB2. Unfortunately the links to the
mods themselves seem to be broken.
My questions to the list are, will changing C11 and C12 (value unknown)
likely to help
I see that on the LA3ZA modification pages there are some capacitor
changes
that change the time constants in the KNB2. Unfortunately the links to the
mods themselves seem to be broken.
These links are to www.qsl.net which seems to be down for the moment. I try
to avoid links to qsl net on the
Hi Don
No KPA for me at this time. So far I've been satified with QRP.
Pam sent them out on Friday so I suspect that they'll be in my mailbox
Monday or Tuesday.
I finished the initial receiver alignment on the other bands and did the
rest of the assy stuff. Then I built up the KNB. Still have
I am puzzled as to why my K2/100 has lost most of its sensitivity on
17 and 30m.
It is the K2/100 I use at my Florida QTH and when I returned from a
visit of a few months to the UK, I found it has lost most of its
sensitivity on 17 and 20m. I can only hear very strong signals and
they sound
Hi Ian,
When I first plugged in my ssb option, I lost all receive too
(extremely weak). I checked all the things mentioned in the manual,
and then I checked the things mentioned on the reflector, all to no
avail.
Next I decided to to check for unwanted paths to ground, referring to
the
K2 serial number 5479 made it's first CW contact today on 20 meters. The rig
went together smoothly in March last year and only required minor trouble
shooting to get it working --- it had a bad solder joint on the preamplifier.
The reason for the delay was getting the operator up to a
Ian,
What mods did you try, and then remove ?
Did the board work OK after you removed the mods ?
None of my mods involve work around the Xtal filter or diode areas, but they
are
round U3 and close to U2 and U4.
Is it possible that you may have put on a short ?
Stewart G3RXQ
On Sun, 21 Jan
Ian,
Look at the KSB2 schematic and locate the components at the top of the page
(filter and its switching).
First try CW mode with the filter on the RF Board selected (not OP1). Then
be certain that everything marked 'RXC' is at 5 to 6 volts (the source is
firmware chip U1 pin 22), and that
Chris,
You are correct, there is nothing unique to 30 meters and 17 meters. Are
you certain your antenna is still OK?
If you have the KAT100, that could have some problem with the inductance and
capitance selected during tuning that is giving the appearance of a weak
received signal.
We really
Accurate Adjustment of K2 BFO frequencies for CW
Although this subject is well covered already with appropriate links to
procedures provided on the Elecraft website, I thought I would share my own
procedure for adjusting the BFO frequencies. This procedure does not require
the use of a
I have a new, just built, aligned and tested KAT100-1. The unit works
prefect. Included is the KAT100, power cable, serial cable and manual.
Price is $250 shipped within the US. Addition $ for shipping may be
required for DX destinations.
Thanks
Brent WB4X
Thanks Don.
I have checked both the 17m antenna (2 el quad) and the 30m antenna
(6BTV) on another radio, and they are both working fine.
I have the K2/100 with the 160m, DSP, and NB options and do not have
the KAT100.
73 de Chris, N4CJ (G4BUE)
On 21 Jan 2007 at 13:01, Don Wilhelm wrote:
quote
For What It's Worth:
(all the OT's use Kc since Hertz hadn't been invented in the heyday of
marine radiotelegraphy) etc
Well, be it known then, that Hertz invented these cycles and, as a
courtesy to that, his name was given to them, so kHz is the expression and
let's keep it that way.
If you have the KPA100 option installed I would be interested in hearing
your take on it. I'm mainly interested in the things that you found out
(good and otherwise) after you installed it as opposed to what you
considered before buying it.
Best regards,
Darrell
(Formerly KB9AV and working to
Hi guys, I need help. I wanted to fine tune my filters in my K2 with
DSP but I find I cannot access the DSP any longer. The tap of
DISPLAY no longer brings up the DSP. I can access the CF1-4 but I
can tell they are WAY off frequency. Usually I turn the rig off and
turn it on again and
Stephen,
Go for it, you'll really enjoy assembling a K2. Suggest you start with a
basic K2 plus the K2SB SSB board and a K2AT antenna tuner.
Use a good power supply. I use an Elpac 6 amp model that I picked up at
a Hamfest for $10.00
Good luck and keep the list informed as to your progress.
And kc used to frustrate the purists (and college instructors everywhere!)
because without the interval specified it's meaningless. The correct term is
kc/s or kilocycles per second.
For example, someone might offer you a job with a pay of, say, $100. It
would make a significant difference if
Built my KPA100 in 2002 and it's FB. Delivers 100 on 160 through 10
meters. It worked exactly as advertised and I expected.
I chose the Elecraft K2 for fixed-station use so my KPA100 is built into the
K2 as it was originally designed. Like the K2 itself it's had lots of heavy
use with no
Hi,
I've just done BFO alignment and freq. calibration on my K2
and have some
questions.
I can zero beat AM stations around 7130 kHz with +-10Hz.
1) BFO range:
High freq. = 4917.13 KHz (= 4916.3 - ok)
Low freq. = 4913.08 KHz (not = 4912.7 !!!)
Range 4.05 kHz (= 3.6 kHz - ok)
Should I have
Hello group.
I'm moving along nicely with K2 #5949 and just completed the resistance checks
for the Front Panel Board.
Everything checks as expected except J1 pin 16 and 17 to ground.
The table on page 28 reads 25 - 35 k.
I measure 19.5 k for pin 16 and 19.2 k for pin 17.
I don't think there
Does anyone out there know of a company taht could assemble a
pigtail assembly for the k2 ant connection. I have never had ham gear
with BNCs . One end of coax would be BNC and the other SO-239.
Dennis Vavra, AD5LY
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Elecraft mailing list
Post to:
Hi guys, I need help. I wanted to fine tune my filters in my K2 with
DSP but I find I cannot access the DSP any longer.
Be sure the RTC menu item is set to on. It may have somehow gotten reset.
73,
Lyle KK7P
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Elecraft mailing list
Post to:
Hi,
I seriously looking for a HF Amplifier, between 800W and 1KW. I'm
also planning to do a 1400km trip to Dayton in may... I really want
to shake hands of Elecraft staff. ;-))
I already owned an Ameritron AL-811H that I did not like very much. I
would like, first, an amp that could live
I'm a little further along than you are, those measurements on my front
panel board are each around 29.2k.
Jim KA2RVO
K2 #5919
From: John Mahon [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Subject: [Elecraft] Resistance Check
Date: Sun, 21 Jan 2007 17:13:41 -0500
Hello group.
I'm moving
If you have the KPA100 option installed I would be interested in hearing
your take on it. I'm mainly interested in the things that you found out
(good and otherwise) after you installed it as opposed to what you
considered before buying it.
Biggest pro: the entire section remains disabled
Dennis,
There are adapters that will do the job nicely. The MIL type for that
adapter is UG-255/U and Mouser has the Amphenol version as PN 523-2900.
They also have the Bomar equivalent (apparently not MIL spec) as PN
678-3317505 but you can find others too - try RF Parts for one source.
The
Dennis, there's BNC-SO-239 plugs widely available, you can pick one
up at your local Radio Shack...
-J
On 1/21/07, Dennis Vavra [EMAIL PROTECTED] wrote:
Does anyone out there know of a company taht could assemble a
pigtail assembly for the k2 ant connection. I have never had ham gear
with
Hi,
I am using both ICPW-1 and Quadra System. Both of them are good. ICPW-1 is
a strong work horse and will survive in extreme operating conditions.
Quadra gives you a fantasic LCD display but you have better not using it
for full duty cycle in 1 kw.
I am still interested in KPA800 / 1600
One thing to be aware of is that if you're using the bail to hold the front
of the K2 up at an angle, many of the adapters will hit the table in back
because of how close the BNC is to the bottom of the K2 back panel. One
solution is to add a BNC right-angle adapter ahead of it.
Of course,
Fred N. van Kempen writes
I have been taking the K everywhere I go, and never had an
issue with customs or TSA. I *do* carry my license (both the
U.S. and European one), and each bag (both checked and carryon)
contain a copy of those, with the text:
ATTN TSA:
THIS BAG
Those frequencies look to be within reason, but I cannot say for certain
since I do not have the Spectrogram (or SpectranV2) plots to see.
You BFO range SHOULD be a bit lower (but if you change it now, you will have
to re-align your filters). You could try padding it down a bit with a
capacitor
Good Evening,
Neither net had what I would call great conditions but we managed to
dig out a fair number of you. I know there were others below my ability
to copy but there is always next week. I am amazed we got Florida again.
OW does seem to help cut through the QRN and QSB though.
First, kudos to Eric, Wayne and everyone at Elecraft for an amazing product. I hope I enjoy using
the K2 as much as I did building it. My New Year's resolution is to try and finish my WAS, I'd like
to use the K2 and a straight key as much as possible.
K2 SN 5929 passed Alignment Part III
I posted this on the yahoo group, but I figured I'll probably get more
exposure by posting here as well. I know that this has been asked a
thousand times, and I have done searches on this subject ad
infinitumbut I still have to ask giving you my details for the best
response! I know that the
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