[Elecraft] [K3] Will I Lose the 120 Watt Max If I update TheSoftware?
Joe Subich, W4TV
lists at subich.com
Mon Sep 21 01:20:02 EDT 2009
> Seriously, in general amplifiers need about 50 watts input to
> get full legal output. That's about a 15dB max gain as set by
> the FCC rules if I remember correctly.
Most 3-500 based amplifiers with 2800 V (no load) on the plates
require 120 Watts or so for "legal limit" output. That's about
11 dB gain. Part 97.317(a)(2) limits the maximum gain to 15 dB
(approximately 50 W drive for 1500 W out).
The extra 10 to 20 watts of drive makes a difference for those
who have SB-220, TL-922, AL-82, AL-1300, AL-572, etc. amplifiers.
It can mean another 200+ W output.
73,
... Joe, W4TV
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jack Brindle
> Sent: Sunday, September 20, 2009 11:59 PM
> To: -.-. --.-N3TU -.-. --.-
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [K3] Will I Lose the 120 Watt Max If
> I update TheSoftware?
>
>
> Just how much power are you running? If going from 100 to 110
> makes a
> 500 watt difference in the output, then you must be putting out 5000
> watts with 100 in, assuming the amplifier is linear.
>
> Somehow I suspect this isn't the situation...
>
> Seriously, in general amplifiers need about 50 watts input to
> get full
> legal output. That's about a 15dB max gain as set by the FCC
> rules if
> I remember correctly. If you need to put much more than that
> in, then
> you either have a lot of loss in the input coupling network (this is
> intentional on some designs), or the efficiency of the finals is
> really bad (old tubes?). Your strategy of getting it checked
> out is a
> good one.
>
>
> On Sep 20, 2009, at 8:14 PM, -.-. --.-N3TU -.-. --.- wrote:
>
> >
> > I'm not causing distortion and stations say it sounds clean on the
> > air. I
> > think I am going to get the amp looked over. Thanks for the info.
> > --
> > View this message in context:
> http://n2.nabble.com/Will-I-Lose-the-120-Watt-Max-If-I-update-
The-Software-tp3682736p3682879.html
> Sent from the [K3] mailing list archive at Nabble.com.
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-Jack Brindle, W6FB
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