Hi Don and everyone.
It does seem that calibrating a wattmeter is a hard thing to do if you don't
have an office at NIST! When I care about accuracy, I measure RF voltage
with the Elecraft DL1 and hope for the best.
Suppose you have a good DC standard, such as Don's or Joe Geller's designs.
Is
Hi group,
Yesterday I downloaded the KPA100 manual and found that in REV .D there is a
R40 resistor of 22k.
Does anybody know what the exact purpose of this Resistor is for?
At the moment I am building KPA100 REV C. , should I also implement this
resistor.
Roger
OE6MSF
k2#5315
Roger,
Check the schematic and you will see why (you should not install only a part
of a mod):
If you are not installing ALL the changes for Rev D, then do NOT install
R40.
OTOH, if you have ordered all the parts to build your KPA100 as Rev D, then
yes, install it as instructed in the Rev D
Johnny,
To sweep the LPF in the K2 with an antenna analyzer, you must terminate the
LPF with a 50 ohm resistor (51 ohms is a close enough standard value).
Terminating the LPF is easy if you have the K160RX header installed - simply
put the resistor leads between pins 7 and 2 of the K160RX header.
Measuring power is not as easy as one might think. The lab where I had
my HP-436A calibrated told me they thought it would be safe to advertise
an LP-100 calibrated against it at 0.1 dB accuracy. That works out to
~2.3%. If I recall correctly, their reference had a certificate that
said
Hi All,
Had to respond to Tom, N0SS's post. We were both licensed in '58 (not
1858!), so our old bodies and minds are at about the same level in decline
:) But I too had a great outing and was able to operate the full 24 hours
(plus three minutes!) without too much discomfort.
When we worked
Ken (and others interested),
The DL1 has a formula in its manual that considers the diode forward
voltage. You can use that to achieve accuracy if you are using a DL1. You
can include similar terms in your measurements and calculations if you are
using an alternative. Apply Ohm's law for power
Hi Bob,
For your information your spelling of Canadian Provinces is incorrect,
it is NOT Providences.
73, Bob VE3XM
Wellesley, Ontario
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Thanks Bob,
Didn't catch the typo or brain to keyboard
malfunction. Only excuse was being tired from a
backpacking trip on Fri/Sat and running the CWSS on
Sun. Attention to detail! Glad I wasn't building
a radio.
73
Bob
WA4MQW
Did you operate in the SS this past weekend?
Hi Lou,
That's probably for the best. I have to say if the YL knew I was even
entertaining the idea of the KPA1500 before Christmas. I don't think I would
be able to afford the the divorce attorney and child support. I'd never get the
amp then. Especially after buying the K2 options I
Refresh my memory. What are these? Linear amps, 800 and 1500 watts out? 100
watts in? Price?
- Keith N1AS -
- K2 5411 -
-Original Message-
Lou Laderman [EMAIL PROTECTED] wrote:
The KPA1500 and KPA800 amps were earlier projected for an October/November
rollout. Elecraft has
Yes they are. yes and yes and for price not sure but I'm sure as nice as they
look and probably preform, they can't be cheap.
Tom W8AMZ
Darwin, Keith [EMAIL PROTECTED] wrote:
Refresh my memory. What are these? Linear amps, 800 and 1500 watts out? 100
watts in? Price?
- Keith N1AS -
There is a photo of the KPA1500 on Elecraft's website under NEWS tab
Tom Nickisch [EMAIL PROTECTED] wrote:
Yes they are. yes and yes and for price not sure but I'm sure as nice as
they look and probably preform, they can't be cheap.
Tom W8AMZ
Darwin, Keith [EMAIL PROTECTED]
The formula given in my DL1 manual is not correct, in my view. The lower the
power, the more incorrect it becomes.
Ed Lambert KD3Y
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Hello all,
Well I went out and tried to buy one 4.7 ohm and one 33 ohm resistor,
but the minimum they would sell me was a pack of 50ea. So I now have 49
extra 4.7-ohm 1/4w resistors and 49 extra 33-ohm 1/4w carbon resistors.
If any KX1 owner wants more power output from your KX1, I'll send you
Operator(s) : N2WN
Q N2WN 72 TN
Club/Team : Tennessee Contest Group
Software: N1MM Logger V6.10.10
BandQSOsPts Sec
1.8 5 100
3.5 167 334 30
7 130 260 19
14 87
The band was a little soft last night and i heard nothing out of K0EVH/pm in
MO.
Our attempt to work KX1/pm to KX1/pm has failed.
It was a cold night (40F) but no wind under a spooky moon lit night.
There were a few holing sounds and a few Bucks came through the
yard earlier. Those friendly
Ed,
Yes, the formula in the DL1 manual is off a bit - there was some discussion
about that on the reflector about 6 months ago.
As I calculate, the correct formula is P(watts)=(1.414(V(volts)+0.15))^2/50
Or easier expressed as P=2(V+0.15)^2/50 (I am not certain why the square
root of 2 (1.414)
Larry Phipps wrote:
You can also fine tune the formula based on DC measurement of the
resistance of the bottom half of the load. The formula assumes an
exact 25.0 ohms for the bottom half of the load.
Also, measure the resistance at the temperature you will be using for
testing. You can
Should my 1W, 2W, and 3W resistors on my KPA100 be mounted pressed against the
board, or should I leave some space between them?
-Ben K1NT
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ED,
I understand that you have had trouble operating your KX1 in cold
temperature. I just wanted to let you know that I have operated my KX1 in much
colder temperatures that + 20 degrees F. Last night I left my KX1 out all
night and it was below zero degrees F. This morning by the time I
Yeah,
Un Pimp out my KX1! (VW Ad)
http://www.leftlanenews.com/2006/02/22/vw-strikes-again-un-pimp-my-ride-videos
1.rewired battery holder for 3.7V AA Cells 12v @ 1.5AH
2.Tx mod for increased power output
3.installed K6XX Visual CW Indicator
4.Bought mini speaker to install in/on rig
I've been reading the posts from people commenting on their experiences with
the K2 is a serious contest environment. Here is just my 2 cents...
I used my K2/100 and an FT1000D with the INRAD roofing filter mod in SO2R at
WA7LT, low power. I think most people would agree that the FT1000D is a
Thanks again to all who replied.
After popping the top of my ASTRON RS-70M I was not able to find a pot that
would let me adjust the output. I called Astron and found out that the pot
was R5 on the bottom of the pcb. The good news was that it was easily
adjustable with no danger of shock. I
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