A..
Thanks. Forgot about the interaction of the ATU bridge and the Power
Control setting.
Measured R of MFJ unit = 57 Ohms. Yuk. Replaced it with my NORCAL load
which measured 49.5 ohms. Now the LP100A shows SWR = 1.02. Will
re-balance the bridge and report back.
BTW: don't you eve
Clark,
The "secret" is to properly balance and calibrate the KAT2 wattmeter.
If you do the balance with a dummy load that is truly a 50 ohm resistive
load ( a 1.13 SWR just does not "cut it"), then adjust the forward KAT2
pot to give you the same K2 display as indicated by the LP-100, your
po
I'm becoming more active in QRP contesting and need to make sure that my
power is <5W. I thought I was aligned ok until I put my LP100A into the
shack (what a wonderful instrument). When Power Control = 5.0, the LP100A =
3.0. Now, I want to be below 5.0, but not that low! To reach LP100A = 5,
P
On Oct 28, 2012, at 5:51 AM, Mike K8CN wrote:
> It sounds like re-heating of the solder connections on both sides of C121 is
> in order. The fact that your RF voltage on terminal 3 of T1 has the proper
> ratio to that on terminal 1 implies that T1's solder joints are OK. The
> absence of RF on
Ben,
When you have low output, it is normal for the RF voltages at the
working stages to be much greater than the listed "expected" values.
Since the Q5 output is higher than expected, but the Q6 input is zero
(or close to it), you have a problem between Q5 and Q6. Refer to the
schematic and
Ben,
It sounds like re-heating of the solder connections on both sides of C121 is
in order. The fact that your RF voltage on terminal 3 of T1 has the proper
ratio to that on terminal 1 implies that T1's solder joints are OK. The
absence of RF on the driver (Q6 base circuit) side of C121 could be
On Oct 27, 2012, at 6:23 PM, Don Wilhelm wrote:
>> On 10/27/2012 7:44 PM, Ben Byer wrote:
>> I've had fun putting together K2 #7373, and am finally at the point of doing
>> the 40-Meter Transmitter Alignment (manual, p.78). I have the unit
>> connected to a 50-ohm dummy load, and am trying t
red, and a connection made, the
K2 was up and running.
73,
David
KC9EHQ
K2/10 #7164
From: Ben Byer
To: Elecraft@mailman.qth.net
Sent: Saturday, October 27, 2012 6:44 PM
Subject: [Elecraft] [K2] POWER control has no effect on actual transmit power
I've
Ben,
You are in for some Transmit Signal Tracing. Turn to appendix A in the
K2 manual and do the steps indicated there.
73,
Don W3FPR
On 10/27/2012 7:44 PM, Ben Byer wrote:
> I've had fun putting together K2 #7373, and am finally at the point of doing
> the 40-Meter Transmitter Alignment (man
I've had fun putting together K2 #7373, and am finally at the point of doing
the 40-Meter Transmitter Alignment (manual, p.78). I have the unit connected
to a 50-ohm dummy load, and am trying to tune L1 and L2 to show 2W on the
internal wattmeter. When I press TUNE, the measured power ranges
Hi folks
finally, after the emails of W3FPR, G4ARI and DL2FI
I replaced D1 D2 in KATU100 and D16 D17 in KPA100.
My k2 is like new
my friends, thanks for helping me.
luca
73 de iz0fyl
__
Elecraft mailing list
Home: http://mailman.qth.net
Hi friends
today the K2 ATU behaved in crazy way. But that is another problem!
After 2 second tuning (always swr=5) , the k2 switched off.
I switched on again the radio but now the power control does not work.
In qrp mode it give 20 watts , in qro mode give 100 watts. no way to control
the power o
Thanks Don for the tips:
> If you have the KAT2 installed, try changing its R6 value to 470 ohms as a
> first step.
> If the K60XV is installed, be certain that its VRFDET output is NOT being
> enabled when the KAT100 is installed and the low power output is not being
> used.
> Check RF board D
Sverre,
It sounds like you are working in the right area, but something seems
inconsistent to me.
Before concluding that the EL5146C is defective, check for something
else (in the base K2) that may be loading down the VRFDET line. The
KAT2 and K60XV as well as D9 and its associated voltage di
My KPA100/KAT100 is located 5-6 meters away from the K2 and I am afraid I have
gotten RF into the VRFDET line and fried the output buffers on both of them.
The Power display on the K2 does not reach full value especially on 15, 12, 10
meters. In this setup I think it is the voltage from the KPA
Jim,
A bit of operational theory first:
The K2 power control circuit is a feedback control loop which includes
the gain of the entire transmit chain in its control loop. As a result,
when the KPA100 is added, the loop gain for some K2s is increased so
much that the loop oscillates. A quick s
Bob,
It is normal for the K2 to develop full power if the VRFDET signal is
not being sent to the K2 microprocessor. The 20 watts is not the
problem, but the result.
For some reason, the VRFDET signal is not getting from the KAT100 back
to the K2. First check the cable between the KIO2 (or
In the lasr email ,I forgot to say that evec with more than 20w output on
the
power meter, the indicated power on the display was only 0.4 w!!!
Rectification : about VREFDET it is 0.8 v , not 1.3v!
VALC (Q8 emeteur) power set to 0 v=0.8, powet set to max v=2.6 v
Puting back the KAT2 I have t
Hi the gang,
Att Gary!
I was going to test the new KAT100. A moment before, it was all right with
all checks, the bridge balanced nicely. I was doing this test without the
KPA100, directly at the K2 output without KAT2.
No reactions from KAT100 (no led on, no detection bye ATU menu). Wth 5 w o
The K2/100 has two ALC circuits. One is found on the K2 Control Board
(MAX534). This ALC works in the CW mode. The other is found on the KSB2 Board
and works in the SSB mode. This is the Tracking Automatic Level Control
(TALC). Tuning up a QRO amp by holding the K2 TUNE and RF/ALC buttons (
o
Elecraft ?
73 de Joerg (DL3QQ)
-Original Message-
Date: Sun, 4 Jun 2006 14:49:21 +0200
Subject: RE: [Elecraft] K2 power control
From: "Don Wilhelm"
To: , , "Elecraft"
Jeorg,
There is one more place to check before replacing U6 - check to see if
U6
pin 8 goes to almost
AUX I/O port.
>
> I will replace U6 and test again.
>
>
> 73 de Joerg (DL3QQ)
>
> -Original Message-----
> Date: Sun, 4 Jun 2006 04:30:01 +0200
> Subject: RE: [Elecraft] K2 power control
> From: "Don Wilhelm"
> To: , "Elecraft"
>
> Joe
the length. I
forgot to disconnect the AUX connector from K2 side. Pin 6 of U6 is
connected to pin 7 of the AUX I/O port.
I will replace U6 and test again.
73 de Joerg (DL3QQ)
-Original Message-
Date: Sun, 4 Jun 2006 04:30:01 +0200
Subject: RE: [Elecraft] K2 power control
From: &quo
Joerg,
You either have something wrong with the wattmeter in the KPA100 or have
something wrong in the path from the wattmeter forward power circuit to the
VRFDET output from the KPA100.
During a quick keydown period (with only the base K2 powered or with the PA
turned off in the menu), check the
Hi,
I need some help. I can not adjust my power anymore when K2 is
connected to the 100 W PA. The PA is overloaded and power
meter shows 200 watt !!!
I tried to switch off PA in menu, but in this ca running with maximum
QRP power.
I assume something
My experience is the same as yours. I assumed that it was normal,
I'm now watching for other comments.
On Tue, 25 Apr 2006 16:15:38 -0400, "Richard Kent" <[EMAIL PROTECTED]>
wrote:
>Another listers power control problem makes me think. I have just finished
>my K2 (#5296). I noticed that when set
Another listers power control problem makes me think. I have just finished
my K2 (#5296). I noticed that when set the power control to 2.0W I measured
1.7 to 2.2 on an external wattmeter. This level changed each keying of the
transmitter but stayed between these readings. Is this normal? My output
> Elliott Lawrence wrote:
>
> >
> >I have a question regarding the power control. I can adjust
> the power in 0.1 w increments per the manual. However for
> example, if I set the level at 5.0w the resultant output is
> usually higher. Sometimes by almost a watt. Other times it
> will be a lit
Elliott Lawrence wrote:
I finally finished my K2 and installed the various accessory pieces. I had two
problems both solved with the reapplication of a soldering iron!!! It's a
great little radio and I enjoy breaking DX pile ups and rag chewing at the 5
watt level.
I have a question regard
I would only do measurements using a dummy load that presents a
constant to the transmitter output..
Art W6KY
Elliott Lawrence <[EMAIL PROTECTED]> wrote:
I finally finished my K2 and installed the various accessory pieces. I had two
problems both solved with the reapplication of a soldering iron
I finally finished my K2 and installed the various accessory pieces. I had two
problems both solved with the reapplication of a soldering iron!!! It's a
great little radio and I enjoy breaking DX pile ups and rag chewing at the 5
watt level.
I have a question regarding the power control. I ca
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