Joe,
You are correct that the specs are for pulse and one can run CW/JT65
at this level since there is no IMD produced by a single sine
wave. So combining two running 750w each gets you 1500w in linear
operation with 2400w dissipation.
1500w mobile!!! Are you serious? I'd guess 200-250w
On 12/14/2014 2:10 AM, Edward R Cole wrote:
1500w mobile!!! Are you serious? I'd guess 200-250w would be adequate for
mobile. But I do not do serious HF'ing.
When you get serious, here's how to do it. My Elmer, W7UVR, ran a high level
modulated 4-1000A mobile in the 1950s. Later went to
I just used a step attenuator to do a crude check on my K3. Throwing in a few dB to
match the 160-meter dipole on the BC band, and tuning in an S9+40 dB signal,
switching in 40 dB attenuation in two 20 dB steps shows, within reading accuracy S9+20
and S9 respectively.
Using my XG2 on
I have an intermittent problem with my XV144 (driven by a K3). On transmit I
can see power output on the LEDs (3 greens) even when there is no audio
input and the transverter is getting quite hot. Stations tell me my signal
sounds fine with no background noise. So it's generating RF somewhere
Your issue with heat sinks and copper spreaders is already solved
and one can run simple fans instead of blowers. And combining two
devices is more complicated than combining 8 or 16? Huh?
I'm not saying it isn't possible - nor that is hasn't been solved.
Only that is it not less expensive
W6PQL has designed and built a 1KW SSPA for 1.8-54MHz using an LDMOS
device. Freescale I think.
he has also designed a pretty stout Low Pass filter designed for 1.5KW
1.8-54 MHz.
He can get 1.2KW out of it at saturation with 2-3 W drive.
A pair of these devices @ 750W could do 1500W all day any
Soon GaN will hold possibilities.
Myron WVØH
Printed on Recycled Data
On Dec 14, 2014, at 8:41 AM, Kevin Stover kevin.sto...@mediacombb.net wrote:
W6PQL has designed and built a 1KW SSPA for 1.8-54MHz using an LDMOS device.
Freescale I think.
he has also designed a pretty stout Low Pass
To Everyone at Elecraft,
First, Merry Christmas A Happy New Year.
Elecraft, by far, has to have the greatest customer service anywhere.
Put in my order for a K1, 2 band kit, plus a 2nd 2 band board, and all the
extra sub-assemblies. Did that last Friday 12/12/14 morning at 0800 PDT.
Hi
In comparing two k3s I am seeing completely different behaviour of the vfo a
when modes are changed.
If for example on one radio I am tuned in to wwv 10mhz, using am, the
frequency on the radio shows 10.000.000 as it should. If I then change to cw,
the radio all of a sudden reads
Good Day,
Please join us this afternoon and evening.
14050 kHz at 2300z Sunday (3 PM PST Sunday)
7045 kHz at 0200z Monday (6 PM PST Sunday)
73,
Kevin. KD5ONS
-
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Home:
The Owner's Manual is your friend ...
Search for Offset - page 29:
SSB/CW VFO Offset
The K3 can automatically offset the VFO frequency when you switch
from SSB to CW mode, so other stations will hear the correct CW
pitch. See CONFIG:CW WGHT for details.
and (page 55):
CW WGHT 1.15 Adjusts
Hi
Yes but it wasn't friendly today. I looked but I guess I overlooked this.
Thanks, Tom
On Dec 14, 2014 1:34 PM, Joe Subich, W4TV li...@subich.com wrote:
The Owner's Manual is your friend ...
Search for Offset - page 29:
SSB/CW VFO Offset
The K3 can automatically offset the VFO
Stewart,
What input level do you have the XV144 set for? The 1mW level from the
KXV3 or the high power input from the K3 ANT1 or ANT2 jacks?
It is important that I know before I can venture a reasonable guess.
Are you using the Elecraft transverter cable to operate the XV144, or do
you have
Hi Don,
Input set to 1mW and using a K3 with a proper cable. When I switch back to
receive the XV144 always switches back to receive - like I said, I can still
hear louder stations. This doesn't mean that something on the board isn't
continuing to emit some kind of RF though.
The LEDs don't flash,
Kevin Stover wrote
W6PQL
A pair of these devices @ 750W could do 1500W all day any mode. but then
the power supply becomes the limiting factor.. 50V at 70amps?
Expert 2k-fa uses a commercial 50v 60A (more peak) PS that weights perhaps 5
lb and is pretty small. Costs $500 in single
To the list:
I occasionally get the Hi Current warning on my K3. I notice it cuts my
power back about 10% from 100w. My initial assumption is that my SWR is
too high - but the SWR meter is easily less than 2.0 I run the ATU which
confirms SWR about 1.2 or so.
So what am I missing - something
KX3 package for sale
My KX3 package has the following included: MH3 mic, KXFL3 passband filter,
KXPD3 keyer, KXAT3 auto tuner, KX3PCKT cable set, and KXBC3 NiMH
charger/clock. There is also a Piglet (which provides for control and software
logging) and its KX3 cable; a Nifty KX3 mini
I'm a little surprised that folks in this group haven't suggested liquid
cooling for this modest application. Semiconductor cold plates have been
around for a long time, are economical to use and in my view a much better
solution than forced air cooling. They are compact, quiet, require far
Good point David,
I have seen an industrial RF amplifier heat sink made out of a 1/4 copper
plate married to a aluminum water cooled plate. Ran on a simple 120 VAC pump
to a 5 gal tank, like my 5KW Bird water cooled dummy load that uses a total
water waste system does the same dissipation.
There are 3,413 btu per KW HR consumed.
Mel Farrer via Elecraft wrote...I know should have the BTU but I don't
remember.
Nick N1KMP
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Help:
My KX3 Package has been sold. Thanks for those who expressed an interest in it.
The buyer now has first refusal right for KXPA amp and tuner. If he choses not
to buy it, I will notify those who expressed an interest in it.
73,
Greg Lamb, W9SDX
Before I sit down and design on, has anyone already designed a 3D printed
stand yet that they wouldn't mind sharing so I can print one?
Mike va3mw
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Help:
Water cooling is OK for QRP. A friend of mine was building a special contest
amplifier. He was working out the cooling which presented a problem because of
the heat involved. I suggested using an upright type freezer and put amp in
the freezer, It worked great!!
George, fritkin
On
Looks like you will be designing one. Hope you will share.
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View this message in context:
http://elecraft.365791.n2.nabble.com/3D-Printed-KX3-stand-tp7595977p7595979.html
Sent from the Elecraft mailing list archive at Nabble.com.
If I do, I will post it on Thingiverse.
Mike va3mw
On Sun, Dec 14, 2014 at 8:58 PM, Bob N3MNT b...@hogbytes.com wrote:
Looks like you will be designing one. Hope you will share.
--
View this message in context:
I just made mine in the ole woodshop to carry the KX3 and PX3 together. Its
about an inch and a half higher off the desk and fairly upright
to make it feel like a single radio. Its oak so it pretty heavy and I put some
grip pad on the bottom to keep it from moving around the desk with key
Bruce tapped out:
I occasionally get the Hi Current warning on my K3. I notice it cuts my
power back about 10% from 100w. I run the ATU which
confirms SWR about 1.2 or so.
.
fwiw, my K3 is doing this quite often lately. I see it thru the KAT500
as well as the Palstar-AT-2K.
Same here, usually with the tuner showing an SWR of 1.2 or so. This never
happened in the past, I wonder if it is related to a software update?
I have to cut the power back, usually under 60 watts for it to go away.
Ken WA8JXM
On Dec 14, 2014, at 10:56 PM, KD7YZ kd...@denstarfarm.us
Maybe there is not enough voltage at the power input to the radio — possibly
due to high resistance at your power connections or in your fuse holders?
73, Matt VK2RQ
On 15 Dec 2014, at 8:18 am, Bruce Chadbourne bruce.chadbou...@gmail.com
wrote:
To the list:
I occasionally get the Hi
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