Elecraft

QRO

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wayne burdick

Re: QRO

Administrator

On May 22, 2006, at 3:33 PM, Lou Laderman wrote:

> True, but the Elecraft will only match 3:1 at 1500 watts....

Hi Lou,

The tuner can match a wider range (about 5:1) at reduced power, and
this can automatically be handled in the amp thanks to a switchable
input attenuator. The behavior of the tuner/attenuator in the presence
of high SWR can be specified by the user.

An SWR range of 3:1 max is a reasonable full-legal-limit criteria for
many operators (including our focus group) when using an internal ATU.
This is typical of the case where nominally matched antennas are used
on each band.

73,
Wayne
N6KR

---

http://www.elecraft.com

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MKM-2

Re: QRO

In reply to this post by MKM-2

No, it should be here & I know which one it is and I was hoping for
a better device.

http://www.advancedpower.com/rfdisplay/default.aspx?marketid=13&appid=-1

On May 22, 2006, at 3:18 PM, Bill NY9H wrote:

>
>
> it an APT device
> http://www.advancedpower.com/rfdisplay/default.aspx?
> marketid=3:4:&appid=-1
>
> i'll bet it's on this page
>
> bill
>
>

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Michael E. Dobson

RE: QRO

In reply to this post by Don Wilhelm-3

The latter will be my approach for SO2R contesting eventually. Given
the features already leaked, it is clear this amp is aimed at the
contesting crowd as one of the primary potential customers. Anyone
know of any other amp out there at any price with dual inputs and
outputs with auto-bandswitching based up on input frequency?

Even factory built the price/performance ratio appears to beat
anything else out there.

They will sell a lot of these units once the world sees how well they perform.

73,
Mike WA3KYY

At 03:25 PM 5/22/2006, Don Wilhelm wrote:

>Non-K2 owners - take note:
>It is not even necessary to have one K2 to drive the Elecraft amp. Of
>course, many would also like to have the K2 as one or both transcivers.
>
>Don W3FPR
>
>-----Original Message-----
>
>I had not yet thought that thru,,, Since the amp take 2 rigs,
>elecraft was wise to figure the other radio might not be a K2
>!!!!!!! COOL......
>
>
>--
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Tom Hammond-3

Re: QRO

In reply to this post by Earl W Cunningham

It'll also match a 4:1 SWR at 1000 Watts.

73,

Tom N0SS

At 06:04 PM 5/22/2006, Earl W Cunningham wrote:

>Lou wrote:
>
>"...but the Elecraft will only match 3:1 at 1500 watts, not a lot of
>room."
>==========
>It means a lot when you consider that the Alpha and Acom amps fault at
>2:1.
>
>73, de Earl, K6SE
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W0FK

RE: QRO

In reply to this post by wayne burdick

That makes sense Wayne. I was not faulting the tuner at all. The comment
I was responding was that having the internal tuner was an advantage of
the new amp. Its somewhat limited range may not obviate the need for a
broader range external tuner if required by the antenna system. I run
SteppIR antennas, where a tuner is not a necessity.

Lou

-----Original Message-----
From: wayne burdick [mailto:[hidden email]]
Sent: Monday, May 22, 2006 6:29 PM
To: [hidden email]
Cc: [hidden email]; 'Ed Lambert'
Subject: Re: QRO

On May 22, 2006, at 3:33 PM, Lou Laderman wrote:

> True, but the Elecraft will only match 3:1 at 1500 watts....

Hi Lou,

The tuner can match a wider range (about 5:1) at reduced power, and
this can automatically be handled in the amp thanks to a switchable
input attenuator. The behavior of the tuner/attenuator in the presence
of high SWR can be specified by the user.

An SWR range of 3:1 max is a reasonable full-legal-limit criteria for
many operators (including our focus group) when using an internal ATU.
This is typical of the case where nominally matched antennas are used
on each band.

73,
Wayne
N6KR

---

http://www.elecraft.com

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St. Louis, MO

"The difference between stupidity and genius is that
genius has its limits." Albert Einstein

Eric Swartz - WA6HHQ

Re: QRO

Administrator

In reply to this post by MKM-2

Actually the APT ARF463 is a better device. It has been an excellent,
and rugged, device for use in the KPA800 and KPA1500 amps. It has been
very hard to kill in our destructive testing. The only time I've blown
one up was when I forgot to screw it down to the heat sink! (It made a
great firecracker in that mode of operation.. :-)

These are 500V breakdown parts, which we run at 60V. Tons of headroom
for short term high SWR events etc.

We use 16 of these transistors in the KPA1600 (four each in each of the
four power module cards). This has the additional advantage that it
spreads the heat dissipation over a much wider area than older designs
that used two or four of the older Motorola devices. Lots of heat in a
very small area equals short lifetimes for semiconductor devices. The
Motorola parts are also much more prone to destruction in normal amateur
abuse. These parts are also MUCH easier to replace in the field.

73, Eric WA6HHQ

MKM wrote:

> No, it should be here & I know which one it is and I was hoping for a
> better device.
> http://www.advancedpower.com/rfdisplay/default.aspx?marketid=13&appid=-1
>
>
> On May 22, 2006, at 3:18 PM, Bill NY9H wrote:
>
>>
>>
>> it an APT device
>> http://www.advancedpower.com/rfdisplay/default.aspx?marketid=3:4:&appid=-1
>>
>>
>> i'll bet it's on this page
>>
>> bill
>>
>>
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> Elecraft web page: http://www.elecraft.com
>
>

Robert McGwier

Re: QRO

You should have seen the look of mischievous delight in his face while
he was telling me this story for the first time. You are having too
much fun.

73's
Bob
N4HY

Eric Swartz - WA6HHQ, Elecraft wrote:
> Actually the APT ARF463 is a better device. It has been an excellent,
> and rugged, device for use in the KPA800 and KPA1500 amps. It has been
> very hard to kill in our destructive testing. The only time I've
> blown one up was when I forgot to screw it down to the heat sink! (It
> made a great firecracker in that mode of operation.. :-)
>
>
--- snip ---
> 73, Eric WA6HHQ
>
>

--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity. Guilty as charged!

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