On 4/1/2017 09:22, John Perlick wrote:
In the case of a solid state amp, the output is matched to 50 Ohms or so.
Period. So any mismatch means that RF is reflected back into the ampwhere
it is converted into heat. Depending on your SWR, that could be substantial!
So let's say 3:1.
gt;> the same COMM port and the K3S is in USB mode with under CONFIG:RS232.
>> Fldigi is not running when I use the Winlink software. I use the
>> Elecraft supplied KUSB cable between the computer and the K3S.
>>
>> Can anyone give me a clue?
>>
>> Th
Using my KAT500/KPA500 installation, I notice that I avoid using the tuner in
AUTO mode, because the loud relays distract me when I am tuning around. In
fact, I tend to disable the KAT500 and turn on the KAT100 in the K3.
Therefore: A KAT1500 should either have sound absorbent materials built
ore careful design and
>> installation of the entire antenna system.
>>
>> 73, Ron AC7AC
>>
>>
>>
>> -Original Message-
>> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
>> brian
>> Sent: Tuesday, March 28,
@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts
KAT500 handles a much wider SWR range (like to about 10:1).
Why do you assume people are lucky enough to have antennas with no more than a
3:1 SWR across the ham bands?
Yes, higher SWR's require beefed up components but welcome to the real
And please do away with the 15 dB amplification limit for all sales
outside the USA. Nobody else has that rule in place so we should not
suffer from it. ;-)
73, Olli
Contest, DX & radio projects: http://www.dh8bqa.de
Am 29.03.2017 um 01:00 schrieb Paul Van Dyke:
Ralph Parker said my
] On Behalf Of Jim
Brown
Sent: Wednesday, March 29, 2017 12:11 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts
On Wed,3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
> An SWR approaching 10:1 means high RF voltages on a coaxial line at
> the voltage loops
Remember that t
On Wed,3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage
loops
Remember that the SWR on a transmission line, and thus the loss in the
line, is determined ENTIRELY by the match between the antenna and the
line, NOT
and installation
of the entire antenna system.
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian
Sent: Tuesday, March 28, 2017 4:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts
KAT500 handles
I noticed the frequencies shown on the NXP web site for their reference
circuits:
81.36 MHz
230 MHz
87.5 to 108 MHz
and .
27 MHz!
73, John W2XS
--
View this message in context:
http://elecraft.365791.n2.nabble.com/Amplifier-thoughts-tp7628611p7628620.html
Sent from the Elecraft
Who needs three boxes if it has a switching power supply and the amp
itself has >90% efficiency?
That would be a nice amp in the best Elecraft 'portable' tradition.
This is the only 1.5kW linear I would consider buying as a replacement
for my good old Commander.
73,
Arie PA3A
Op 29-3-2017
I cast my ballot for NO internal coupler.
1) An internal coupler is NOT needed by many who would rather not pay for
something they don’t need. Sure, it could be optional but see points 2 and 3.
2) An internal coupler at 1.5 KW as anything beyond a trivial “line flattener”
will be large. If
I used to own the 1 KW Icom PW1 linear amplifier. It included within its huge
& heavy
black box the switching power supply and the 3:1 antenna auto-tuner. I sold
that
amplifier because my eyes sparkled in delight with a much, much smaller desktop
KPA500 from Elecraft.
If this new 1.5 KW
John -
I used to live in the world you do... but I now live in a neighborhood
where I can't put up a tower, or even a multiband dipole. My 30' Flag Pole
is OK, and, in fact, my neighbors think it is quite nice looking, but in
order to use it on more than the one band where its unmatched SWR is
I guess we live in different worlds. My 10m-20m beams have an SWR <1.2:1
anywhere in the band. I designed them this way and no luck is involved.
the SWR is a little higher at the top of the band on my lower band
antennas but certainly not in the 3:1+ range you are referring to. A 1kw+
Elecraft
Perhaps an installable option would satisfy all...
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John
Marvin
Sent: Tuesday, March 28, 2017 9:12 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts
Put me down as a vote
Put me down as a vote against a built-in antenna tuner. I prefer a
separate external tuner that integrates well with the amplifier. It
allows for a lot more configuration flexibility.
73
John
AC0ZG
On 3/28/2017 5:00 PM, Paul Van Dyke wrote:
Ralph Parker said my list.
1500w output, 160 -
You can always use impedance transformers to bring your match back within
the "impedance range" of your tuner. These cost far less per unit price
than the components required to beef up an internal tuner to handle
impedance's of 500-800 ohms or more (or the conjugate) with a solid state
amp.
A
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian
Sent: Tuesday, March 28, 2017 4:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts
KAT500 handles a much wider SWR range (like to about 10:1).
Why do you assume people are lucky enough to have antennas with no more than
KAT500 handles a much wider SWR range (like to about 10:1).
Why do you assume people are lucky enough to have antennas with no more
than a 3:1 SWR across the ham bands?
Yes, higher SWR's require beefed up components but welcome to the real
world.
73 de Brian/K3KO
On 3/28/2017 23:00 PM,
Ralph Parker said my list.
1500w output, 160 - 6m.
2 inputs.
4 outputs (Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations. :-)
Paul. KB9AVO
On Mar 28, 2017 4:40 PM, "Ralph Parker"
I better post this before I'm too late.
I'd like:
All the features of my KPA500, plus
1500w output, 160 - 6m.
2 inputs.
2 outputs (or more. Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations).
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