This is why the K4 (and a small number of other transceivers) include "active
predistortion" capability in hardware. It adapts the drive power to the
response curve of the PA stage. The K4 also has an TX sample input to include
an external amplifier in the correction loop. (The KPA1500 has a TX
Well, that’s very good news. Unless I’ve missed it, this is first note I've
seen that confirms predistortion corrections in the K4.
Grant NQ5T
> On Nov 4, 2019, at 10:58 AM, Wayne Burdick wrote:
>
> This is why the K4 (and a small number of other transceivers) include "active
>
Note the TX SAMPLE input on the rear panel, clearly shown in the product
brochure :)
Wayne
N6KR
> On Nov 4, 2019, at 8:29 AM, Dan Atchison via Elecraft
> wrote:
>
> Yea!?? I've been waiting for this announcement!?? Way to go Elecraft!
>
> On 11/4/2019 11:13 AM, Grant Youngman wrote:
>>
The hardware is in place. Some firmware is required that will be phased in when
it's ready.
Wayne
> On Nov 4, 2019, at 8:13 AM, Grant Youngman wrote:
>
> Well, that’s very good news. Unless I’ve missed it, this is first note I've
> seen that confirms predistortion corrections in the K4.
>
Hello,
in the past (2017) i adapted KCOMM for the K3s, maybe i will have the
opportunity to update KCOMM again for the K4 but... at this moment a K4
is missing in my shack :-(
I dont' know if Carlo Bianconi will give me the opportunity to test the
K4.
Thanks, 73's de IW2NOY
[Link to the
All public companies operate to benefit the investors/shareholders.
That means balancing dividends and profits against things that may
impact their bottom line like destroying customer assets and legal threats.
SCE is no different, but they went more toward safety as a way to
maximize
Plus every time trimming or thinning is required, homeowner and legal processes
(including court time in some cases) the utility (not just PG or SCE) must
follow, take an inordinate amount of time and resources thanks to
‘environmental’ groups failing to realize it is a renewable resource and a
Yea!?? I've been waiting for this announcement!?? Way to go Elecraft!
On 11/4/2019 11:13 AM, Grant Youngman wrote:
Well, that???s very good news. Unless I???ve missed it, this is first note
I've seen that confirms predistortion corrections in the K4.
Grant NQ5T
On Nov 4, 2019, at 10:58 AM,
Thank you, Bob. Rob, clarified to me. Seems most transmitters are in the same
boat using solid state transmitters/amplifiers, vs. tubes.
73,
Bill
K9YEQ
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Bob McGraw K4TAX
Sent: Sunday, November 3, 2019 7:25 PM
There are at least three factors making fires both more intense and more
frequent in recent years:
1. Our power companies (including PG) have not been diligent about clearing
trees away from residential and HV lines. In my own neighborhood I've spotted
many houses with power feeds that are
Hello,
in the past (2017) i adapted KCOMM for the K3s, maybe i will have the
opportunity to update KCOMM again for the K4 but... at this moment a K4
is missing in my shack :-(
I dont' know if Carlo Bianconi will give me the opportunity to test the
K4.
Thanks, 73's de IW2NOY
[Link to the
I operate remotely with a K3/KPA1500 via the RemoteRig boxes. Internet
bandwidth on the RF end is great, but as we travel, the operator end is often
quite marginal. It appears the K4 will be sharing considerable information
between the RF and Op end over the internet connection. Is there a
Wayne has described the issues with susceptibleness to wildfire, well.
In the last 100 years (or so) wildfire has been suppressed by man
thus providing an increase in "fuel" growth. Only in the last few
years have forest scientist and managers modified this to allow
natural fire to correct
I'm grateful they do. I always run the radio off of a battery, so I don't have
to ever worry about whether the AC power is on or not. I like to be able to
run my radios during a disaster. It's a lot simpler to connect the radio to
the battery, than to connect radio to power supply, then to
On 2019-11-04 4:44 PM, Scott Manthe wrote:
> Elecraft's design philosophy dictates that their radio be capable of
> portable/field operation, so that's how they design their radios.
> They're lightweight, efficient, and operate off 12 volts.
If that's the design philosophy, limit the power
We went to great lengths to create an ideal sigmoidal (raised cosine) rise/fall
characteristic for our CW keying envelope. It is set at approximately 5 ms and
will not be shortened for any reason. Elecraft rigs don't click.
We also ensure that ALC never interferes with the CW keying waveform.
Perhaps since that is the standard voltage for cars, trucks, RVs and other
vehicles.
I run my power supplies at 14.2 v to be as clean as possible.
Rick NK7I
Smell Czech correction happens
> On Nov 4, 2019, at 12:53 PM, David Gilbert wrote:
>
>
> Their continued insistence upon
Elecraft's design philosophy dictates that their radio be capable of
portable/field operation, so that's how they design their radios.
They're lightweight, efficient, and operate off 12 volts. Lots of other
manufacturers love giant, heavy rigs. Elecraft doesn't.
73,
Scott N9AA
On 11/4/19
sTef,
Surely you can receive some standard station at a known stable frequency
and use Method 2. While WWV is suggested, that method will work with
any station having a know stable frequency.
Method 3 had been discontinued some time ago.
73,
Don W3FPR
On 11/3/2019 2:20 AM, DM5TU - sTef
Hi all,
We've chosen to have the K4 continue to be a field-capable radio, inheriting
the characteristics that have always made the K3/K3S (and the K2 before it) the
preferred rig for FD, DXpeditions, and multi-transmitter stations. Thanks to a
lightweight but rigid internal aluminum frame, the
I am hoping that the K4, like its predecessor the K3(S), does _NOT_ give
a user the ability to change its CW rise times.
I believe the K3 is designed for a 5ms rise. Many, if not most, other
manufacturers allow as little as 1ms resulting in CW signals that reach
beyond 1kHz of bandwidth by
I agree completely with all of that, but with the discontinuance of the
K3s it seems that Elecraft doesn't really consider the K4 to be strictly
a base station rig. Their continued insistence upon everything being 12
volt capable is a bit of a puzzlement for me.
73,
Dave AB7E
On
Perhaps the K4 should have been a 40V radio and the K3S remain as the
12V "portable" or "field" version.
k4ia, Buck
K3# 101
Honor Roll 8B DXCC
EasyWayHamBooks.com
On 11/4/2019 5:02 PM, Joe Subich, W4TV wrote:
On 2019-11-04 4:44 PM, Scott Manthe wrote:
> Elecraft's design philosophy dictates
On 2019-11-04 10:48 AM, Bill Johnson wrote:
Seems most transmitters are in the same boat using solid state
> transmitters/amplifiers, vs. tubes.
The issue is that 12V transistors are simply not capable of providing
the "clean" voltage swings necessary to generate 100 - 120W peak power.
A
Hi,
after I finally installed the KAF2 module in my K2/100 05775, it was
time to do a complete alignment and I ran into this old problem again.
The output power at 160 m is 100 W. And drops from band to band to 80 W.
Now I have adjusted the KPA100 to 10m. Now I have there 100 W but then
on
Another reason my next rig is the K4!
Sent from my iPad
> On Nov 4, 2019, at 6:22 PM, N6KR wrote:
>
> We went to great lengths to create an ideal sigmoidal (raised cosine)
> rise/fall characteristic for our CW keying envelope. It is set at
> approximately 5 ms and will not be shortened for
One could always have a modular approach which is how other industries approach
this. Broadband combiners are not that complicated. BTW, predistortion is
common practice is a number of industries.
Sent from my iPad
> On Nov 4, 2019, at 5:03 PM, Joe Subich, W4TV wrote:
>
> On 2019-11-04
Joe,
Not everyone uses an amp with their 100-W rig (in fact, far less than half).
Like other 100-W radios that are compatible with field use, the K3/K3S/K4 must
make ~100 W from a 12-15 V mobile, solar, or battery supply. But it also has to
be efficient at this power level.
If you only need
Holger,
Is your power supply voltage at 13.8 volts or better yet 14.3 volts?
That should be as measured by the voltage display on the K2. It should
not drop below 12.7 volts during a 100 watt transmit.
Part of the problem may be attributed to the voltage vs. frequency curve
of KPA100 D16 -
I don't want to look like I'm beating a dead horse so this will be my
last comment on the subject, but my point was that I don't think very
many contest stations or DXpeditions are going to sell their K3s rigs to
buy a K4 (I don't see a compelling reason for them to do so), so I'm not
sure
On 2019-11-04 6:20 PM, Wayne Burdick wrote:
At home, use 13.8 to 14.2 V for lowest IMD. In the field, the K3 (and
now, the K4) automatically scales maximum power output based on
supply voltage, and can run down to as low as 11 V.
It is a shame that the maximum power output along with bias
On 2019-11-04 7:34 PM, W2xj wrote:
One could always have a modular approach which is how other
industries approach this.
Sure, a modular approach would work well ... a 12V/60W PA or
a 40V/200W PA that would plug into the same space. Not exactly
rocket science.
> BTW, predistortion is common
Dear Don,
I read at the K2 13.6 V. It is a Powerwerx PS from Elecraft with the two
Powerpole connectors at the front. The Voltage drops at 100 W / 28 MHz
to 12.2 V. I already replaced D16. No change. I tried several PS.
73,
Holger DL9HDA
On 05.11.19 02:46, Don Wilhelm wrote:
Holger,
On 11/4/2019 8:49 PM, Holger Doerschel wrote:
drops at 100 W / 28 MHz to 12.2 V.
What size wire? How long?
73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
I guess I still don't understand that choice, particularly since the
bulk of the new features that separate the K4 from the K3s seem geared
more toward fixed station use than portable operation. You could have
kept the K3s (which is still a world class rig) for anyone actually
needing
Predecessors to the K3 have already reached the "unobtanium parts"
stage, K3 probably isn't too far behind. The US military logistics folks
will do a "lifetime buy" when parts for the airplane or tank are headed
for obsolete-ness. The US military never runs out of checks, of course.
[:-) I
As stated earlier, a radio with internal power supply capable of 90V to
250V and run the PA devices from 48 to 60 volts for a 100 watt radios.
And for mobile or portable, a 12VDC to 120VAC converter, makes it a 12V
radio. I use a 1000 watt pure sinewave converter on our travel
trailer. The
You're right, Joe: you don't want to push predistortion to the max available
power out on a given band. It may be a little less than 100 W to ensure
headroom under all load conditions.
And these days, predistortion is done with DSP. The K4 has a lot more
horsepower in this regard than the
Build radios with internal supplies capable of 90V to 250V and the PA's
running 48 to 60 volts for 100 watt radios. The continued insistence
on 12V radios should be limited to mobile or portable type and
configured radios.
73
Bob, K4TAX
On 11/4/2019 3:31 PM, Graydon (N7RXL) wrote:
I'm
> On Nov 4, 2019, at 4:29 PM, Bob McGraw K4TAX wrote:
>
> The continued insistence on 12V radios should be limited to mobile or
> portable type and configured radios.
Like the K4 :)
Wayne
N6KR
>
> 73
>
> Bob, K4TAX
>
>
> On 11/4/2019 3:31 PM, Graydon (N7RXL) wrote:
>> I'm grateful
FWIW, I am betting on the K4 and have
fully pre-paid the estimate on the K4D.
If it comes out to cost more in the end,
so be it. I love my K3 & the K3s because
of their wonderful brilliance, how could I
not possibly go for the K4 knowing the
mentality behind the brand?
Personally, I wish I
Elecraft has made their design decisions for the K4.
Since someone suggested running a 100w 12v device at 60w then it
occurs to me to obtain 100-120w then run two devices in parallel or
push-pull. Should not increase weight or drive requirements by a
significant amount. Cost probably under
Elecraft itself was forged during Field Day. This (and other cases where
portability matter) are engrained in our DNA :)
A K4 or K4D is actually in a similar price range to K3S stations, as typically
configured. And many of these are taken out of the shack, at least historically
speaking.
How much money would you like to bet? As much as Eric and Wayne? If your
assertion were true, no one would buy a Flex, or an Icom or a FTDX-101.
Hams love new stuff and there's a reason that Wayne and Eric are willing
to bet their actual money against your virtual money that lots of ops
will
I run a 12 volt Solar system, 4 100 watt panels hooked up to 4 6 volt Golf Cart
batteries. I have 12 volt LED lights (look like a regular lightbulb) all over
the QTH, run router, wifi, phone, shack all without an inverter. If you end up
losing the things in your fridge we’re talking what,
Any persistent lubrication.
"Copper slip" graphite grease, whatever. Stainless is not ideal in an
outside situation where dirt can over time get into the threads, that
then result in the metal "galling" (partial seizing/self welding) when
you try to move it.
Regular BZP or Galvanised types
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