Neat K3 Video!

[N8LP]

Right on, Bill. Joe's comments are some of the most useful I have seen in all the K3 related postings. With all the menu choices the K3 has, it seems like they could have incorporated (could still incorporate?) the option of "industry standard" or "Elecraft" choices for some of these functions. I think we have already heard from Eric on the subject of ALC. I don't use it for the reasons he gave, but some people do, and I believe he has said that it will be addressed.

BTW, I hope the KPA800/1600 will either provide negative going ALC as an option or have a built-in fast acting attenuator to obviate the need for external power control if they want a broader audience than K3 owners ;-)

73,
Larry N8LP



KK7P re W4TV:
 >Please be assured that we appreciate your thoughtful and constructive
comments on the K3.

         I strongly second that Lyle...I only wish Joe had
been one of your beta testers because of the quality of
his suggestions.  Keep that in mind for the K4!   ;-)

                                 73,  Bill  W4ZV




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[Stephen Brandt]

It looks like the K3 will be with us for a long time to come.  At least I
hope so.  I have heard several on in recent contests, and they sound good.
I hope to be able to purchase one after the dust settles. Perhaps in 2013
(hi hi).  I hope that the K4 doesn't come along anytime soon.

    73,

    Steve Brandt N7VS

    Portland, Oregon


> Right on, Bill. Joe's comments are some of the most useful I have seen in
all the K3 related postings. With all the menu choices the K3 has, it seems
like they could have incorporated (could still incorporate?) the option of
"industry standard" or "Elecraft" choices for some of these functions. I
think we have already heard from Eric on the subject of ALC. I don't use it
for the reasons he gave, but some people do, and I believe he has said that
it will be addressed.
>
> BTW, I hope the KPA800/1600 will either provide negative going ALC as an
option or have a built-in fast acting attenuator to obviate the need for
external power control if they want a broader audience than K3 owners ;-)

>
> 73,
> Larry N8LP
>
>
>
> KK7P re W4TV:
>  >Please be assured that we appreciate your thoughtful and constructive
> comments on the K3.
>
>          I strongly second that Lyle...I only wish Joe had
> been one of your beta testers because of the quality of
> his suggestions.  Keep that in mind for the K4!   ;-)
>
>                                  73,  Bill  W4ZV
>
>
>
>
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[Joe Subich, W4TV]

> BTW, I hope the KPA800/1600 will either provide negative
> going ALC as an option or have a built-in fast acting
> attenuator to obviate the need for external power control if
> they want a broader audience than K3 owners ;-)

I would hope they have an attenuator that can be adjusted in
0.5 dB steps on a per band basis to match available drive to
the level required for rated output.  The problem with many
rigs and rig/amplifier combinations is that the rig has excess
gain in the early stages to allow "headroom" on the band with
lowest overall gain and ALC (external or internal) is used
as the primary means of controlling (limiting) output power.  
Unfortunately, ALC can only come into play once the desired
level is reached and the excess gain gives rise to significant
overshoot/click/wave sharpening issues.  

One can see significant variation in gain vs. band looking
at the QEX article on the Tokyo High Power HL-2.5kl.  The amp
includes a fixed 3 dB pad on the input but the output power
(gain) varies from a low of 1400 W (11.4 dB) on 1.8 MHz to a
high of 2050 W (13.1 dB) on 10 MHz.  In fact, overall system
performance would be improved by using a fixed 2 dB attenuator
followed by selectable 0.5 and 1.0 dB pads.  

Negative going ALC is fine to touch up the level (within the
.5 dB bands) and to provide a "failsafe" tool to reduce drive
if the SWR or collector/drain current goes too high but it
has no place as the primary power (gain) setting tool.  

73,

   ... Joe, W4TV
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Larry Phipps
> Sent: Monday, December 03, 2007 10:30 AM
> To: [hidden email]
> Subject: [Elecraft] Neat K3 Video!
>
>
> Right on, Bill. Joe's comments are some of the most useful I
> have seen in all the K3 related postings. With all the menu
> choices the K3 has, it seems like they could have
> incorporated (could still incorporate?) the option of
> "industry standard" or "Elecraft" choices for some of these
> functions. I think we have already heard from Eric on the
> subject of ALC. I don't use it for the reasons he gave, but
> some people do, and I believe he has said that it will be
> addressed.
>
> BTW, I hope the KPA800/1600 will either provide negative
> going ALC as an option or have a built-in fast acting
> attenuator to obviate the need for external power control if
> they want a broader audience than K3 owners ;-)
>
> 73,
> Larry N8LP
>
>
>
> KK7P re W4TV:
>  >Please be assured that we appreciate your thoughtful and
> constructive
> comments on the K3.
>
>          I strongly second that Lyle...I only wish Joe had
> been one of your beta testers because of the quality of
> his suggestions.  Keep that in mind for the K4!   ;-)
>
>                                  73,  Bill  W4ZV
>
>

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