Hi Stewart
Try Rather than directly connecting the decoupling cap to the 5v
supply, try
feeding it via a 100 ohm (or so) resistor. at 1ma you will only drop .1 v
but you have created a low pass filter for the noise.
Rgds
Andy Pevy
G4XYW
A future K2 owner (when the company bonus
Has anyone who experienced oscillation with their KPA-100 (internally or
externally mounted) seen a spur about 1Khz up from the main signal?
If I crank up my power to 100W a very brippy spur pops up just above my
signal only on 160M. If I keep the power at 95W or less it is not there.
Congrats!
Bob...that is a great score for 5W!I never heard a single VK or ZL on
80. Only Oceania was a single KH6.
My new K2/100 amp got finished in plenty of time for the contest but my 80M
dipole is cut for SSB and the power on the KPA-100 folded back to 55W so I
had to use my Orion and
On Tue, 30 Nov 2004 08:47:38 GMT, Stewart Baker wrote:
On Tue, 30 Nov 2004 07:59:31 +, Andy Pevy wrote:
Hi Stewart
Try Rather than directly connecting the decoupling cap to the 5v supply, try
feeding it via a 100 ohm (or so) resistor. at 1ma you will only drop .1 v
but you have created a
My two cents worth, I remember the long dah =0, A=1 and N=9 being used on
the ham bands sometimes, way back in the middle ages (1940s). But not long
ago I upset a guy on 40m by giving him a RST report of 57A, (A= auroral
tone). He thought I meant that his tone was sixty-cycle or less, very
rough
At 01:24 AM 11/30/2004, Stewart Baker wrote...
problem, but I am back with the noise. It is a shame that there is no way to
get
at the +8V rail on the front panel board as that would be an ideal mic supply.
The Auxbus connection between the RF board and front panel is unused. You could
cut the
On Tue, 30 Nov 2004 07:18:23 -0500, Mike S wrote:
At 01:24 AM 11/30/2004, Stewart Baker wrote...
problem, but I am back with the noise. It is a shame that there is no way
to get
at the +8V rail on the front panel board as that would be an ideal mic
supply.
The Auxbus connection between the
I've always done the following to see if I was going to toast something.
Maybe someone can tell me the error of may ways (the last thing I did this
on was a $1,400 Video Camera - if the method is dangerous, I'll stop!).
I hook the 6V Camera up to a 6V power supply (actually a variable voltage
PS)
Just a passing thought...
Those who are not affiliated with any of the DX
contest clubs may like this idea.
We might form an Elecraft DX Contest Group, just to
submit scores as a bunch of happy builders. I'd be
curious to see the total.
Not really thinking about a formal organization, just
a
I would like to be a part of that group Julius. Go ahead and submit your
log however. It's too late to put a group together for the 2004 CQWW CW.
I forget how far in advance you have to notify the contest committee. It
may be as little as 1 week prior to the contest. But you need to provide
Response to Stewart G3RXQ
I have also experienced the strange effect of no audio out after switch on. My
K2 has been operational for about 3 months now and I have noticed the problem
only about 4 or 5 times. I just switch it off and then back on again and
everything is ok. Next time I will
Guys, there are several things to consider when raising the input
voltage to the K2 family.
First, power loss in the regulators. There are several 5V, 6V and 8V
regulators on board. If you have a 12V source to a 6V regulator, you
will be burning up as much power in heating up the regulator
Tom, K2TA wrote:
Has anyone who experienced oscillation with their KPA-100 (internally or
externally mounted) seen a spur about 1Khz up from the main signal?
If I crank up my power to 100W a very brippy spur pops up just above
my signal only on 160M. If I keep the power at 95W or less it
Stewart Baker wrote:
The amplifier only draws about 1mA, however because of noise on the 5A line,
mainly from the LED bar graph I have had to heavily decouple the pre-amp supply
to stop the noise from being superimposed on my speech.
What I think is happening is that this decoupling is
Hi Ron! It was a Jan 2004 production release that was unbuilt when I
bought it 2 weeks ago. Elecraft was kind enough to ship me the new shield,
firmware and upgrade mods to bring it up to spec so it's up to snuff
including the mu-metal speaker shield.
I received a very interesting e-mail from
On Tue, 30 Nov 2004 08:01:25 -0800, Vic Rosenthal wrote:
Stewart Baker wrote:
The amplifier only draws about 1mA, however because of noise on the 5A line,
mainly from the LED bar graph I have had to heavily decouple the pre-amp
supply
to stop the noise from being superimposed on my speech.
On Tue, 30 Nov 2004 15:51:22 +0100, McNamara, Philip wrote:
Response to Stewart G3RXQ
I have also experienced the strange effect of no audio out after switch on.
My K2 has been operational for about 3 months now and I have noticed the
problem only about 4 or 5 times. I just switch it off and
Just received my MD2 and see it is necessary to modify my K@ to use it.
It's that rather silly from a marketing stand point? I would have thought
plug and play.
Phil
Philip LaMarche
LaMarche Enterprises, Inc.
www.instantgourmetspices.com
727-944-3226
(800) 395-7795 pin 02
Cell 727-510-5038
I would bet, that's the reason they were discounted. Smart move on Elecraft's
part, only wish we were advised before hand. Other than that, I'm satisfied
with mine. Now when I can get the K2 to talk up, it will be a win-win
situation.
Later
KXBill
Just received my MD2 and see it is
Is this spur present when running full power QRP?
Try 15watt to see if the spur is made by the K2 itself .
Turn PA off in menu or power K2 from it's DC barrel jack.
If it's gone you know it's made by or with interaction of the KPA100.
Tom LA1PHA
- Original Message -
From: Tom Althoff
Phil,
I don't understand what needs to be modified - it is plug and play if you
are wired for an Elecraft mic already.
Those jumpers and the resistor are supplied with every Elecraft mic
including the on-sale MD2 - just in case they are needed.
What is necessary is that the mic
I would like to be a participant of such a group my self.
Tom LA1PHA
From: J F [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Tuesday, November 30, 2004 9:00 AM
Subject: [Elecraft] Elecraft DX Contest Group?
Just a passing thought...
Those who are not affiliated with any of the DX
Dan,
You method will work in some cases, but can result in component damage in
others - there is no one answer, it depends on the device and its design. I
personally wouldn't try that with my digital camera (it is not a throw-away
expense to replace it).
Far better to use a regulator or
If the airplane batteries are clearly superior in performance, you
should consider making a pack of them that meet the voltage requirements
of your camera. In almost every circumstance, the excess voltage is being
dissipated as heat and/or causing more direct damage.
On Tue, 30 Nov
I worked in the semiconductor industry and I remember frying a bunch of
chips when I reached a knee in the current draw. You can increase the
voltage until something breaks down, and then you're hosed. Lots of
current flows and your semiconducting device is no longer conducting at
all since you
Sounds good to me - 72 Bruce/
72/73 - Bruce ve5rc/ve5qrp - I believe in the KIS principle.
** Enter QRP-Canada's RUN with RAC contest -
details at http://www.qrp-canada.com ***
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Hi Dan,
I would be very hesitant to use this technique on expensive equipment.
Gradually turning up the voltage while watching the current can lead to a
problem that doesn't show up immediately since components can be operated at
a higher than normal temperature for a while but their failure rate
HI
Last weekend I found out that my K2 didn't work correctly on 40 and 80 meters.
The power on 40 is jumping between 100 and 50 watt when I do keydown
When rotating the power pot, it looks like a bad pot meter. The power is jumps
up and down
when I turns it
Its worse on 40 and a bit better on 80
In a message dated 30/11/04 16:46:51 GMT Standard Time,
[EMAIL PROTECTED] writes:
That's what I was doing, however, because anything capacitive slows the rise
of
the 5A rail, and hence the correct MCU initialisation, I was chasing my tail.
This is a problem I have come across before
Response to DB3LMN and G3RXQ.
Philip and Stewart
my K2/4477 shows the same strange sffect. I found out: AGC goes up, blocking
the IF-Amp; S-Meter shows full deflection, can
be checked at the AGC-Amp U2A pin1. Touching that IC with your fingertip acts
like a reset. Changing the IC did not
I finally got around to reading this review and believe that the
last 2 paragraphs say it all.
Gil K8EAG
On Mon, 29 Nov 2004 20:54:26 EST [EMAIL PROTECTED] writes:
Elecrafters,
For those who are ARRL members, you can see the review at the
Members Only
web page
Interesting to see all the people operating in CQWW with their K2s. We used
my K2/100 for one of the multi positions at VE3YAA. Worked on 80m and 15m.
Only ran 20w from the K2 but that was enough to drive the Alpha 89 to 1kw
output!
One day I will try QRP, one day
73 de Tony, ve3rz
K2/100
I just uploaded the newest version, 2.0, of Marote to the web.
http://www.qsl.net/ab6cv/index.html
New features include:
Griffin Powermate support!
Better performance using new multithreading improvements
DSP filter support added
XFIL control on the Main page
Save your PA, serial port, and
Karl,
Try re-soldering things - particularly U2, Q12, D1, R3, and R5. The normal
voltage at U2 pin 1 is 3.7 to 3.8 volts for most K2s. A solder joint that
looks good, but has some resistance could cause that sort of problem - and
the resistance can change with temperature, so results are
Hi Leigh,
Thanks for the suggestion, which I've added to the wish-list.
73,
Wayne
N6KR
On Nov 30, 2004, at 1:47 PM, Leigh L Klotz, Jr. wrote:
The KX1 offers 4 sidetone levels, 3 if you discount off, generated
from two pins of the PIC16 microcontroller, which are toggled high and
low through
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