: KPA1500 amplifier with built-in ATU,
separate power supply
We’re pleased to announce our KPA1500 solid-state amplifier, covering 160 to 6
meters. Max power output is 1500 Watts. Other important features include:
- Small RF deck fits on nearly any desktop (~4.5 x 13 x 11.5”, HWD); weighs
Excellent point I look forward to deploying more/better copper! :-)
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Clay Autery, KY5G
On 4/21/2017 11:32 AM, Alan Bloom wrote:
> With 1500W of power, if the SWR is greater than 3:1 you may be
> exceeding the ratings of the feedline. For example, Belden 9914 is
>
An excellent point missed by many of the desktop tuner and high feedline
SWR advocates who insist on using coax fed antennas. Typically, they
blame their failures on cheap coax.
73,
Bill - NA5DX
On 4/21/2017 11:32 AM, Alan Bloom wrote:
With 1500W of power, if the SWR is greater than 3:1
Ease up for a minute Look at it my way. I KNOW I am gonna need an
external tuner with massive capability to do the same thing I am doing
now only one tuner on the commercial market will tune my 80m loop
at 1500W the way the K3s can.
I didn't WANT an onboard tuner... I consider the
I'm not necessarily defining a personal situation. But almost any 80 or 160
antenna will suffice as an example.
I am currently constructing a vertical for those bands. The model shows 2:1 on
160 at resonance and >3:1 just 60 KHz away and this is with considerable ground
loss. Less loss
With 1500W of power, if the SWR is greater than 3:1 you may be exceeding
the ratings of the feedline. For example, Belden 9914 is rated at a
maximum of 300 VRMS, which is 1800W with a 50-ohm feedline or only 600W
with a 3:1 SWR. At 30 MHz, RG-8/213 style coax is typically rated at
1500W with
Wes
Can you describe your affected antennas?
73
Jim ab3cv
On Apr 21, 2017, at 8:56 AM, Wes Stewart wrote:
A couple of points.
If you believe that an SWR of >3 necessarily degrades the efficiency of an
antenna, you are simply wrong.
If the "tuner" components have to
John,
Don't agree--unless there truly is something wrong with the antenna,
connections or feedline.
Does your 80 or 160M antenna cover the entire band with <3:1 SWR?
If fact, on those bands the extra loss due to SWR is negligible with
even 5:1 SWR's with usual coax. On 80M with a 5:1 SWR
Wes -
Excellent points. One of the locals has very fine antennas, but really
appreciates the fact that his PW-1 can make the SWR look a 'bit' better. At
my QTH, and TUNER, is absolutely necessary... but that is because I have
only one antenna, and it is usable without a tuner on only one band.
A couple of points.
If you believe that an SWR of >3 necessarily degrades the efficiency of an
antenna, you are simply wrong.
If the "tuner" components have to be derated to this extent then perhaps it
should be called a line flattener rather than a tuner because a lot of guys are
still
The KPA1500 tuner range is fine. If your antennas have >3:1 SWR you need
to do some work outside. It will help your signal much more than the amp.
Even when I operated the RTTY Roundup in January after an ice storm my
antennas were within this amplifiers SWR range.
John KK9A
from: Wes
ps.com<mailto:elecraft...@yahoogroups.com>
Subject: RE: [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in
ATU, separate power supply
Ken:
How would one implement this. I know that the real weak spot amongst the high
power solid state amps available to the Amateur community has b
Not enough full power tuner range.
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Ken K6MR wrote:
> One interesting item in the rear panel photo: Tx Sample. Output for “Pure
> Signal” style IMD improvement using pre-distortion in an SDR radio?
Yes.
Wayne
N6KR
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Sent: Thursday, April 20, 2017 9:40 PM
To: elecraft...@yahoogroups.com<mailto:elecraft...@yahoogroups.com>
Subject: RE: [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in
ATU, separate power supply
Wow …Wayne and Eric, yo
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