During the past week or so I have been working T32C with my K3/KPA500
combination. While operating RTTY at the 450-500 watt level, I have noticed,
on many occasions after transmitting my call seeking a contact, a single
clicking sound coming from the amplifier a second or two after key up. Does
Go here for a schematic...
http://www.worldwidedx.com/amplifiers/96435-elecraft-kpa500-high-frequency-amplifier-manual-schematics.html
Chuck, KE9UW
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Chuck, KE9UW
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Hi Jack,
OK for everything. I do not know the Bruhan#39;s VLF converter but I guess I
understood how it maybe made.
I have used an MC4066 for an SSB demodulator in my modified FT726R. The Ron is
very high, on the hundreds ohm. I have also used the 74HC4066 to replace it and
also used it as a
Good morning all, I have the K2 serial number 6612 it has the KPA-100 installed
I am in the process of converting it into the KAT100-2 along with KAT100.
Below are some questions
In the manual I am told to remove C44 from the control board that is beside U1
in the K2. I noticed this cap was
Jim,
You are confusing the subreceiver with VFO B. They are two separate
things. You don't transmit from the subreceiver, you transmit from VFO
B, and VFO B is there even if you don't have a subreceiver. To put it
another way, you can operate split without a subreceiver. BTW, RIT and
repeater
Assembled and working fine.
Kit price is $239.95
Ship for $210.00 (CONUS)
Thanks
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Thanks to all who replied. I think I will stick with the KAF2.
On 10/15/2011 9:15 PM, Bob DeVarney W1ICW wrote:
Does anyone have a sense of how the DSP for the K2 compares to the K3?
I was very impressed with the DSP in a K3 I was working on for a friend.
I have a K2 myself and have been
I removed the power supply and reassembled everything and the problem is
gone. It was not the interlock since this was tested. All cables seemed
ok.
Anyhow, thanks for all the help.
VA2FSQ
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I'm not seeing any difference here. Is there a new version of the
config program? I have v 0.9.3. I downloaded and reinstalled
downloader v 1.6. The installation seemed OK but I see no 6m
in the bandmap and it still says there is no KRC2 connected.
73, Roger
On 10/13/2011 1:12 PM, Eric Swartz -
Just a thought, why isn't the schematic available on the Elecraft site.
What is the deal with worldwidedx?
Regards,
Mike VP8NO
On 16/10/2011 10:51, ke9uw wrote:
Go here for a schematic...
The schematics used to be on the Elecraft site.
For some reason, they have been removed...
Guess they'll come up again some time!
73
Mike Harris wrote:
Just a thought, why isn't the schematic available on the Elecraft site.
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Richard - HB9ANM
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Hi,
It works fine for me. Make sure both VFO's are in FM mode. Press the AB
*twice* to ensure this. I tried this, tuned B a few kHz away and it
transmits fine in split.
AB2TC - Knut
Randy Cook wrote:
This afternoon, I saw T32C on 10M FM, 29.580.. They were running split
(actually several
Why would you think that? Properly designed, an air core balun and a
ferrite core balun are electrically identical.
I did not mean to imply there's an inherent defect in ferrite cores, but
they have limitations that air core inductors do not that must be considered
in any design using them. We
I am curious if anyone has used the KPA500 on AM, and what it's duty cycle
and output would be.
Mike N8XPQ
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Here's the schematic. I purchased it in 1983. I was wrong he used a
74HC4066
http://elecraft.365791.n2.nabble.com/file/n6898162/scan0014.jpg
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Jack WA9FVP
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Here's the circuir description. Again, I was wrong, he called it a balanced
mixer, not a ring mixer.
http://elecraft.365791.n2.nabble.com/file/n6898183/scan0013.jpg
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Jack WA9FVP
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I suspect they have been revised a few times since those were first posted and
the revised ones are different enough that they pulled the originals to
eliminate confusion.
W0EB
The schematics used to be on the Elecraft site.
For some reason, they have been removed...
Guess they'll come up
Elecraft net today has moved up to 14.307 due to QRM. 73
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AM would be less duty cycle power at 500 watts PEP AM (yes, PEP AM) than
RTTY or CW
Fully modulated AM has a peak power of four times the carrier. That means
that the AM carrier has to be 1/4 of the KPA500's rated output, or 125 watts
AM carrier. This is only somewhat more dense of a power pull
Don, I'm certainly sad to hear your having problems. Do you have any excess
ladder line in the shack? That's about the only thing I can think of.
My only rfi has been in amplified speakers on 17m. The feedpoint of my
80 m delta loop is 25' from the shack over the house. The house is not inside
Don,
You might also consider making it a three sided loop with the apex away from
the house to a friendly tree. Several hams are doing it that way and the
patterns are not the same as a square loop, but the match and multiband
operation is equal, a thought.
Mel, K6KBE
Ron D'Eau Claire wrote:
They also didn't do much except make us feel better. Ferrite core chokes
actually DO something useful. The cracked balun was poorly designed, so
it overheated. That's a DESIGN mistake, not a defect of ferrite cores.
73, Jim K9YC
Why would you think that? Properly
I second the comment by Fred, K6DGW, regarding the new paddle on the
front of the KX3. We were together yesterday at Pacificon when examining
it and it's both an excellent paddle and nothing like the paddle offered
as an option with the KX1. If I understood Wayne correctly, it is a
custom
Hi Jack,
thanks for the circuit diagram and info on the converter. You should not
feel sorry if you did not remember the right IC p/n and type of mixer20
years of space are a long time to remember small particulars...hi
Thanks again for the discussion and best 73
Gian
I7SWX
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An interesting discussion...much is usually made of the self-shielding
property of ferrite toroids, and we see this in practice in interstage
transformers as well as in baluns [sic]. (I am talking here about the
balun type also called a choke balun.)
However, it is also a fact that the
Good Afternoon,
I have a little time to catch up on these reports today so I will
get them out before the first net. The sun is shining and the
temperature has zoomed up to 56 degrees F! Very warm after the cold we
had last week during all that rain. No wind but there is some gunfire.
OK, now I am confused (a normal state of affairs around here)
If a cracked toroid core is useless, then how do the split bead
clamp-on cores manage to work? Isn't the split equivalent to as great
big lengthwise crack?
I also seem to remember broken ring cores working again when glued
First, even a very thin gap may significantly reduce the core
permeability. A high quality split core will have its mating surfaces
lapped flat.
Second, if the core cracked because of excessive heat, it's likely the
ferrite material incurred irreversible damage.
Jack K8ZOA
On 10/16/2011
We will definitely let you know when the KRC2 config tool is updated. We are
trying to do something about that at this time.
Upgrading a new firmware version into the KRC2 does not modify the band maps -
that allows continued use of the current band maps that may have been modified
previously.
You have to remove the sub to install them...
I pretty much knew what I wanted after decades of ham radio so I
just bought the 8 pole ones and put them in right away.
-
Chuck, KE9UW
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Some confusion results from the fact that there are two different materials
used in
toroids (etc.): Ferrite and powdered iron. Powdered iron cores are composed of
tiny
particles which are insulated from one another...so if they break you can glue
them back
together and they will work fine.
Mike,
For your K2 or any others above SN3000, those changes mentioned in the
KPA100 manual have already been made.
There is no difference in the K2 board wiring between mounting the
KPA100 directly on the base K2 or mounting it in an external enclosure.
That information is for those having
Jim...
I think the snap-ons are designed to be lossy devices. They are
designed to be a convenient shape for wires, cords, cables, etc. and to
provide loss for fields that fringe out of those cables. Tiny air gaps
are not particularly important for this function.
Ferrite donuts used
I still use the Burhans converter along with my K3 to copy VLF. I'm feeding
the converter into the receive input on my K3. Lately I have been using the
MULTIPSK software by F6CTE to decode MSK in the 300KHz range. It's abit out
of the realm of Ham Radio but it's something I've done for years.
We had to QSY at the beginning of the net to dodge another net that had been
pushed down, so we went to 14.307 MHz. Once settled in, we had a good net
with generally strong signal levels. We had 31 participants over a 26
minute period. We even had a new UK station, John/G3XRJ. The discussion
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