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kpa1500?

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Grant Youngman

Re: kpa1500?

>
>
> And then there would have to
> be a KAT1500 to go with it.

Have we completely lost the ability to do anything if a mouse click or one-button push won’t do it for us???

:-)

Grant NQ5T

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Jack Brindle-2

Re: kpa1500?

In reply to this post by Vic Rosenthal

Hey Vic;

Hope you are enjoying life in Israel. Someday I'd love to visit the country. Strange not having you over here, though.

As for the original KPAs, I can assure you that at this time there are no functional units. There are a lot of wild rumors on the list in this topic, most very much untrue. But, I will also say that the KPA500 contains a close derivative of the firmware from the earlier effort.

And yes, the older units were beasts! Carrying them took a bit of effort!

73!

JackB, W6FB

Sent from my iPad

> On Dec 13, 2014, at 3:37 AM, Vic Rosenthal <[hidden email]> wrote:
>
> There was a KPA1500 and KPA800 shown at Visalia one year. I saw the 1500 in action, connected to a keyer sending an endless loop into a dummy load at full power. I was told later that there was no problem with performance or FCC specs. They simply wanted to concentrate their resources into the K3, which had just come out. The projected price, though, was WAY above $5000.
>
> When they came up for air after selling a gazillion K3's, they apparently decided that an amplifier the same size as the K3 that could run on 120V and sell for less than a king's ransom was a better product. I have heard that a prototype KPA1500 is in the shack of a loud ham in California.
>
> Vic K2VCO/4X6GP
>
>> On Dec 13, 2014, at 12:58 PM, Pete Smith N4ZR <[hidden email]> wrote:
>>
>> One existed, in prototype form, and one of the testers told me that a few were in the field for testing. It was shown at Dayton at least one year, maybe 10 years ago now. I suspect it used many of the transistors then available.
>>
>> Did you guys notice that the amp in the latest QST cost $4500 for parts - of course, it was two 1.25 KW RF decks in one box, so the cost for a 160-6M legal limit amp might be similar. Still, when you're cranking out KX3s and K3s and P3s and KPA500s the way they are, does it make sense to build up production facilities for a couple of hundred amps a year?
>>
>> 73, Pete N4ZR
>> Check out the Reverse Beacon Network at
>> http://reversebeacon.net,
>> blog at reversebeacon.blogspot.com.
>> For spots, please go to your favorite
>> ARC V6 or VE7CC DX cluster node.
>>
>>> On 12/12/2014 7:58 PM, Richard Thorne wrote:
>>> I'd be a buyer.
>>>
>>> Rich - N5ZC
>>>
>>>> On 12/12/2014 6:17 PM, CenturyLink Customer wrote:
>>>>
>>>> As a 6 month Elecrafter (k3+p3) I have never seen any discussion nor requests for a legal limit compatible Elecraft amplifier with the seamless attributes of the kpa500 . It would seem that the now extablished 1000 w devices could form the basis for a commercially viable amplifier. Perhaps no one else is interested, but I wanted to ask if such a product is even on the "consideration" list?
>>>>
>>>>
>>>>
>>>> Myron
>>>>
>>>> W7LXN
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>>
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Scott Manthe-2

Re: kpa1500?

Jack,
Did Elecraft destroy the two functional units they had at Dayton? I
literally spent hours looking at them at Dayton, and the KPA1500 was
running at legal limit output for three days. It was a beauty!

http://www.n6ie.com/Elecraft.html

73,
Scott, N9AA

On 12/13/14, 3:10 PM, Jack Brindle wrote:

> Hey Vic;
>
> Hope you are enjoying life in Israel. Someday I'd love to visit the country. Strange not having you over here, though.
>
> As for the original KPAs, I can assure you that at this time there are no functional units. There are a lot of wild rumors on the list in this topic, most very much untrue. But, I will also say that the KPA500 contains a close derivative of the firmware from the earlier effort.
>
> And yes, the older units were beasts! Carrying them took a bit of effort!
>
> 73!
>
> JackB, W6FB
>
> Sent from my iPad
>
>

Jack Brindle-2

Re: kpa1500?

No, they still exist. Just not functional at this time. I have no idea what it would take to make them functional...

That project allowed the development of some very interesting technology that is in use in the KPA500 and maybe a few other places. A lot of the protection mechanisms first saw the light off day there. Because of all the things we learned in that project, the KPA 500 is a far better amp than the predecessors. That was a fun project, oh so long ago. So was developing the KPA500 for that matter.

And, as many will attest, the KPA500 is a whole lot of fun to use, especially for this contester.

- JackB, W6FB

> On Dec 13, 2014, at 12:54 PM, Scott Manthe <[hidden email]> wrote:
>
> Jack,
> Did Elecraft destroy the two functional units they had at Dayton? I literally spent hours looking at them at Dayton, and the KPA1500 was running at legal limit output for three days. It was a beauty!
>
> http://www.n6ie.com/Elecraft.html
>
> 73,
> Scott, N9AA
>
> On 12/13/14, 3:10 PM, Jack Brindle wrote:
>> Hey Vic;
>>
>> Hope you are enjoying life in Israel. Someday I'd love to visit the country. Strange not having you over here, though.
>>
>> As for the original KPAs, I can assure you that at this time there are no functional units. There are a lot of wild rumors on the list in this topic, most very much untrue. But, I will also say that the KPA500 contains a close derivative of the firmware from the earlier effort.
>>
>> And yes, the older units were beasts! Carrying them took a bit of effort!
>>
>> 73!
>>
>> JackB, W6FB
>>
>> Sent from my iPad
>>
>>
>
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Jim Brown-10

Re: kpa1500?

In reply to this post by Wes (N7WS)

On Sat,12/13/2014 4:56 AM, Wes (N7WS) wrote:
> Congratulations, but do you believe that you would have not worked
> them with the antenna 30 feet lower?

I do believe that -- in 8 years of trying, I did not. This time around,
they were just enough above the noise that I made it. Careful modeling
predicts 2-3 dB of added low angle gain for that difference in height.

http://k9yc.com/VertOrHorizontal-Slides.pdf

73, Jim K9YC
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Rick WA6NHC

Re: kpa1500?

In reply to this post by Grant Youngman

It would be for those of us that run the station remotely. It's hard to reach the tuning knobs if you aren't there.

No tune amps and auto-tuners are perfect for this example. In my belts and suspenders preference, I also can watch the station with Skype video and a web cam, should the tuner need attention (or fault out).

Rick, WA6NHC

iPad = small keypad = typos = sorry ;-)

> On Dec 13, 2014, at 11:27 AM, GRANT YOUNGMAN <[hidden email]> wrote:
>
>
>>
>>
>> And then there would have to
>> be a KAT1500 to go with it.
>
> Have we completely lost the ability to do anything if a mouse click or one-button push won’t do it for us???
>
> :-)
>
> Grant NQ5T
>
>
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Wes (N7WS)

Re: kpa1500?

In reply to this post by Guy Olinger K2AV

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 20-meters with full output at S9 (cal point) adding 6 dB attenuation at a time shows one S-unit steps down to about S4 or so.

Wes N7WS

On Sat, Dec 13, 2014 at 1:20 AM, Jim Brown<[hidden email]>
wrote:

Several comments. First, while the "official" definition of an S-unit is
6dB, one S-unit on most receivers is more like 3-4 dB. While I haven't done
a linearity test on the K3 S-meter, I suspect it's a bit better.

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