My K2 and my watt meter do not agree. When I set the K2 power output at
5 watts I get almost 10 according to the external watt meter. Setting
K2 power output at about 12 watts gives something between 15 and 20 out
on the external meter. At settings above about 13 watts on the K2 knob,
I get the
I tried TWO good watt meters on the K2 and I found that the K2 is NOT accurate.
The ONLY place I found it to be accurate is at exactly two watts. I also found
that my K2/100 will go down to 100 Mw then jump to just over one watt, then to
over to three and etc, it's not a smooth transition. I
100 MW now that's what I call QRPP !
When is the next Elecraft QRO amp due ?
:)
73
Stewart G3RXQ
On Wed, 24 May 2006 07:45:19 -0700 (PDT), Curt wrote:
I tried TWO good watt meters on the K2 and I found that the K2 is NOT
accurate. The ONLY place I found it to be accurate is at exactly two
The basic K2 power ouput indication is very accurate when operating into a
50 ohm non-reactive load. If it is driving anything other than that load,
the indication will be inaccurate - he basic K2 does not have a wattmeter, t
does have an RF Probe type detector which reports the RF Voltage to the
Curt,
The base K2 power reading is quite accurate if (and only if) the load is 50
ohms pure resistance. See my other post on the subject.
Since you have a K2/100, the included wattmeter should be as accurate as
your calibration of it. Prhaps you should re-do the calibration - or
possibly both
Thanks Don,
So with my basic K2, I should get agreement between the K2's setting and
its output when driving my 50 ohm dummy load. I'll check it that way
and report back.
I never completed the RF probe with the K2 (didn't need it). I assume
it simply converts RF AC voltage into DC voltage
It's a standard diode peak detector I believe, so it would indicate 31.7
VDC (minus the drop) at 10 W for a 50 ohm load. I expect the drop is
about 0.3 V.
Larry N8LP
Darwin, Keith wrote:
Thanks Don,
So with my basic K2, I should get agreement between the K2's setting and
its output
Ya lost me there Larry. P = E^^2 / R. R is 50 ohms, P is 10 watts, E
works out to sqrt(500) or 22.36 volts. But are we talking RMS, peak, or
peak-to-peak?
Let's see, if my number is an RMS and you're number is peak, then 22.36
is about 22.4. Multiply by 1.41 and I get 31.6 Pretty close to
- Original Message -
From: Don Wilhelm [EMAIL PROTECTED]
To: Darwin, Keith [EMAIL PROTECTED]; elecraft@mailman.qth.net
Sent: Wednesday, May 24, 2006 9:29 AM
Subject: RE: [Elecraft] K2 power output measurement accuracy?
K2 - all it takes is a known non-reactive 50 ohm load. I use 1
Rick, K7MW asked:
With my K2 into a DL1, my WM-2 meter shows up to 20 % higher power than my
DMM and slide rule indicates. Is the DL1 likely more accurate than my WM-2
meter. If so, I will recalibrate my K2 with the DL1 and DDM. Than I will
have a stronger QRP signal and be able to work 300
At 15W the DL-1 is by far more accurate. It is probably within a few
percent, based on a normal random distribution of resistor values, and
5% worst case if they're all off in the same direction. Keep in mind
though that the resistance changes as temperature rises... so it's best
to take a
Hi Guys,
Just wondering if this is normal behavior: I have my K2 set up with my DL1
dummy load. With output set to 5 watts, when I hold tune I sometimes get
about 4.6 and sometimes 5 - 5.something and sometimes 6 to 6. something.
This happens on all bands and at various power settings. Is it
Sam,
That is normal. The power control ALC is not active during TUNE in order to
allow you to tune a manual antenna transmatch without causing the power to
fluctuate wildly with changes in the load impedance as you tune.
If you check the keydown level you will see more consistent power levels.
Hi all:
I have a strange symptom with my K2/100 (S/N 4387). For all power settings
above 0.1 but below the point at which the 100 watt amp kicks in, I get
about 20 watts output. Once I go to high power, I get the full 100 watts
output, regardless of where in the range of 20-100 the power
I started to do the 40meter tx power test when I set the control for 2.0
watts, I get 2 watts out. When I set it for 5 watts, I get 5 watts but can get
any higher no matter if I set the control to 10 or higher. I have the same
issue on 80 meters. I haven't tried it on any other band.
Bob
Bob,
First thing to look at is the power supply - Tap teh DISPLAY button and
attempt to transmit at full power - if the voltage sags drastically, check
the power supply, the connecting cable and the terminations for good
connections, adequate cable size (16 gauge or larger).
If the voltage stays
On Fri Aug 5 23:04:11 2005, Pat N8VW [EMAIL PROTECTED] wrote :
After some more debugging it appears that the ksb2 is causing the problem.
Removing it returns tx power to normal levels. Some might say, good you
don't need ssb anyway.
Looking at the dac u2 I find that pin 5 is at 6v
G'day,
After some more debugging it appears that the ksb2 is causing the
problem.
Removing it returns tx power to normal levels. Some might say, good
you
don't need ssb anyway.
Sounds somehow familiar. Check the resistor packs.
Regards,
Mike VP8NO
Hi Pat,
There are three two signals fed into the KSB2 that directly affect
power output. One is V RFDET which controls the base of Q1 and the
other is ALC which is applied to the collector of Q1. Since removing
Q1 makes no difference, V RFDET isn't likely the cause. But the ALC
on the
On 4 Aug 2005 22:40:19 -0400, Pat N8VW [EMAIL PROTECTED] wrote :
My K2 (2016) is suffering low output starting on 20 and wrapping around to
10 and 160 where I get little to no output. 80,40,30 are unaffected. Rx is
great. Symptoms include, low output and inability to increase output beyond
My K2 (2016) is suffering low output starting on 20 and wrapping around to
10 and 160 where I get little to no output. 80,40,30 are unaffected. Rx is
great. Symptoms include, low output and inability to increase output beyond
a certain level. Both symptons vary per band. When I'm less tired
OK,
I confess that after building control and receiver circuits [carefully]
with no problems, I wanted to believe the rig was 100% after initial
transmitter alignment. I put the rig on the air and made contact immediately.
THEN: a friend loaned me his OHR WM-1 wattmeter so I could
In a message dated 05/02/05 17:50:03 GMT Standard Time, [EMAIL PROTECTED]
writes:
I have noticed an irregularity on my K2 output.
When setting the power level a 2 watts, and then using the ATU I get a
reading on my SWR/power meter in the line of 4 watts. Setting power
on the K2 to 3
Slater, VE5OA wrote:
I have noticed an irregularity on my K2 output.
When setting the power level a 2 watts, and then using the ATU I get a
reading on my SWR/power meter in the line of 4 watts. Setting power
on the K2 to 3 watts, I get 4 watts on the in line meter. I thought the
meter might
Slater,
You likely do not have a problem. Take away the antenna, in-line SWR meter,
and the ATU - and substitute a good 50 ohm dummy load. Be certain it is 50
ohms resistive and has no capacitive or inductive component at the frequency
you want to do your testing (you can measure it with an
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