Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

: 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

Re: [Elecraft] KPA1500 amplifier with built-in ATU, separate power supply

<elecraft-requ...@mailman.qth.net> wrote: KPA1500 amplifier with built-in ATU, separate power supply ______ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

Re: [Elecraft] KPA1500 amplifier with built-in ATU, separate power supply

10:06 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 amplifier with built-in ATU, separate power supply ..In real systems, most of the reflected power bounces straight back out again when it hits the PA, to get another chance to be lost in the feeder, or even

Re: [Elecraft] KPA1500 amplifier with built-in ATU, separate power supply

Real PA designs are very far from correctly reverse terminating the transmission line. The maximum power transfer theorem is a complete red herring in this sort of situation. For example, on the top of page 12 of the third edition of the Art of Electronics, immediately after setting the

[Elecraft] KPA1500 amplifier with built-in ATU, separate power supply

amp than my coax! John Perlick Aria Corporation www.ariacorp.com > On Apr 21, 2017, at 2:29 PM, "elecraft-requ...@mailman.qth.net" > <elecraft-requ...@mailman.qth.net> wrote: > > KPA1500 > amplifier with buil

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Just as a bit of anecdotal data, I am feeding a 20m dipole with 1200 watts through 600-ohm open line on 40 through 10 meters. The SWR on 40 meters approaches 100:1 (the line is short, but I am still eating about 2.2 dB loss). Anyway, this presents a very difficult problem for most tuners -- and

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

To: Elecraft Reflector <elecraft@mailman.qth.net> Subject: Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply There seems to be some disappointment that a relatively compact wide-range auto-tuner at legal limit CCS (or even ICAS) is not included. I don’t co

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

There seems to be some disappointment that a relatively compact wide-range auto-tuner at legal limit CCS (or even ICAS) is not included. I don’t consider this a negative. 1. A legal limit "LOW LOSS" CCS tuner using the build methods of most typical ham auto-tuners would be large and heavy

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

this message in context: http://elecraft.365791.n2.nabble.com/New-from-Elecraft-KPA1500-amplifier-with-built-in-ATU-separate-power-supply-tp7629660p7629734.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Without modeling it, I would guess that it will actually narrow the matched BW and it makes it a single band antenna at the same time. My Drake L4-B would drive anything. When I decided I needed a new challenge (9BDXCC) I wanted to get on 160. Of course the Drake didn't cover 160 and my

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

I have to keep physically restraining myself from placing an order just for the pleasure of owning one! It's *just* *so* *Elecraft*! :). - kb7psg On Fri, 21 Apr 2017, Clay Autery wrote: Wayne, Eric, and everyone else who had/has a hand in making this happen: Well done! Simply

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Hi Clay, You're on the list. Thanks! Wayne N6KR http://www.elecraft.com > On Apr 21, 2017, at 10:44 AM, Clay Autery wrote: > > Wayne, Eric, and everyone else who had/has a hand in making this happen: > > Well done! Simply superb effort to overcome multiple and

[Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

It is very easy to put a hairpin coil on your top band vertical and bring the resonant SWR to 1:1. This should give you much more usable SWR bandwidth for the KPA1500. Many commercial tube amplifiers will only tolerate 2:1 SWR. John KK9A >From Wes Stewart n7ws Fri Apr 21 13:11:12 EDT 2017 I'm

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Wayne, Eric, and everyone else who had/has a hand in making this happen: Well done! Simply superb effort to overcome multiple and significant obstacles on many fronts. Please, do place me on the list of folks keenly interested in knowing when one might place an order/pre-order. :-)

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Excellent point I look forward to deploying more/better copper! :-) __ 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 >

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

hs only ~22 pounds > - [...] */ > > - Silent PIN-diode T/R switching (no QSK relays) / > * Can't believe it... YOU DID IT !!! O_O Great result ! I love Elecraft ;-) 73's de iw2noy / w2noy -- View this message in context: http://elecraft.365791.n2.nabble.com/New-from-Elecraft-KPA1500-amplif

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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.

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

[Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

[Elecraft] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Nice! When you asked what we would want in a high power amp, this matched my wish list perfectly. Great job Wayne! John KK9A From: Wayne Burdick n6kr Fri Apr 21 00:01:29 EDT 2017 We’re pleased to announce our KPA1500 solid-state amplifier, covering 160 to 6 meters. Max power output is 1500

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

Not enough full power tuner range. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

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 __ Elecraft mailing list Home:

Re: [Elecraft] [Elecraft_K3] New from Elecraft: KPA1500 amplifier with built-in ATU, separate power supply

[Elecraft_K3]<mailto:elecraft...@yahoogroups.com> 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

[Elecraft] New from Elecraft: 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 only ~22 pounds - Separate lightweight switching power supply