Chris,
I am glad you have things restored to sanity.
73,
Don W3FPR
On 12/14/2013 8:45 PM, Chris Kimball wrote:
I added 19.5 ft of RG-58 coax formed into a 6 inch diameter coil between the
rig and the LDG 1:1 balun. Meter results on ALC or RF for the dummy load
and for the antenna are now the
I added 19.5 ft of RG-58 coax formed into a 6 inch diameter coil between the
rig and the LDG 1:1 balun. Meter results on ALC or RF for the dummy load
and for the antenna are now the same.
Steps to the solution:
1. Get the transmitting BFO aligned with the built-in SSB filter in R and
R-reversed
Some progress..
1. The BFO setting for the R bar mode was set incorrectly, resulting in a
dsb-like transmission. The 't' in the filter settings really does mean that
the FL1 BFO is used for transmitting.
2. The power levels were within 1 watt at 20 or 30 watts via a DL2
measurement scheme. No
The KAT-100 manual, page 33, suggests disconnecting the VRFDET line at the
K2 in the event of Erratic power control with K2/100.
Since may KPA/KAT are in the same box, it's unlikely I'll use the KAT
without the KPA.
Does this seem reasonable?
Thanks,
Chris
NQ8Z
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View this message in
Chris,
That is *not* in the newer manual that I have, and it is *not*
reasonable to do disconnect VRFDET.
Secondly, removing the VRFDET signal from the K2 MCU will cause the K2
(and KPA100) to go to full output at all times - sometimes in excess of
160 watts. If that continues, the base K2
The manual I was looking at was KAT100 Revision A, Nov 5, 2002. (A vintage
manual!)
The current manual at the Elecraft site is KAT100 is Revision C, March 12,
2003, which on page 34 suggests putting a 0.01 uF capacitor from pin 7 to
ground (inside the backshell). for Erratic power control with
Chris,
There is no harm in that at all.
If you have a very long cable between your EC2 enclosure and the K2, you
may try shortening it.
I suggest you check the actual power output vs. the requested power
setting before attempting anything else.
73,
Don W3FPR
On 12/13/2013 2:52 PM, Chris
OK, I'll give it try.
I've done that, using the DL2 and a DC voltmeter. Given the max is 30W, how
much of a difference between requested and measured power can there be (at
30W)?
Thanks,
Chris
NQ8Z
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Rob,
Thanks for your helpful comments.
My setup has a KAT-100 in it and the KAT-100 is, apparently, is the source
of the power level measurement, not the KPA-100. I've got the Elecraft
dummy load and your suggestion was great.
At this point it looks like the R98 replacement is the way to go.
Chris,
If you have both the KPA100 and the KAT100 in the system, the power
output is measured with the KPA100 wattmeter.
If the KAT100 is used on a K2/10 than the KAT100 wattmeter is used for
power output measurement.
Take both the KPA100 and KAT100 away and the base K2 uses a simple diode
Chris,
I have been monitoring this thread, since I have had some similar problems
with my K2. My recent experience may help you.
In the K2, amplifier gain is in the ALC loop. When you switch from low
power to high (go from less than 10W to greater than 10W), the KPA100 gain
changes the ALC
I bought the K2 (SN 4913) assembled. I don't see any special notes in the T4
section of the manual, but I'll check later today when the K2 is
disassembled.
On-the-air checks with K3CC and VE3FMC show that the signal is good at 10W
(KPA not active) and poor at 11 W (KPA on). SSB operation AT THE
Critical question: When I adjust the power level of the K2/KPA combination
between low (10W) and high (100W) power is the power measurement taken at
the same point for both levels?
Clearly, the RF level scale changes between the two settings. 10W is full
scale below 10W, 100W is full scale
Chris,
The power should be measured by the wattmeter in the KPA100 in both
cases. Note that you must use the KPA100 SO-239 jack (not the base K2
BNC antenna jack) anytime the KPA100 is installed.
The KPA100 contains a scaling circuit for the wattmeter (Q10 and Q11
with resistors R24 and
Thanks for the reply.
The setup is a K2 with a KAT2 tuner feeding a KPA-100/KAT-100 in a separate
enclosure. The connection is from Ant 1 of the K2 KAT2 to the BNC input of
the KAT-100. The internal wiring of the KPA-100/KAT-100 routes this to the
amplifier input in the usual way for this
Don,
My KSB2 is revision E, July 20, 2004, with the PSK31 ALC time constant
change of KI6WX built-in. It doesn't have the increased RF gain mod. Is
there a reference to the mod that you suggest with the R9 - 15K and a new
1K in the Q1 base?
I was amazed at the instability at the 5W level
Chris,
That actually is 1.5k at R9, sorry for the slipped decimal point.
I believe you already have the information sent to you. For others who
are interested, it may be found near the end of the mod document found
at http://www.qrpproject.de/Media/pdf/SSBModsUK.pdf.
73,
Don W3FPR
On
Chris,
Is there any chance you have T4 wound for the better efficiency at 5
watts ratio of 2:2:1:1 turns?
If so, be aware that this winding ratio is *only* for a QRP CW only K2.
If the KSB2 is added, it must be changed to the standard 2:3:1:1 ratio.
With the 'better efficiency at 5 watts mod
I'm getting reports that my digital mode Olivia 8/500 signals are distorted.
Usually, the comments fall into two categories: 1) overdrive 2) audio
compression on. I know that the audio compression is set 1:1 (off). And
I've tried to prevent overdrive by the method suggested by Don Wilheim,
Chris,
A few things come to mind. Does your KSB2 have the KI6WX increased RF
gain mod installed? If so, you may have to add some additional changes
to the KSB2 to control the ALC. Change R9 to 15k and cut the trace
between P1 pin 6 and Q1 base and insert a 1K resistor (you will have to
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