[Amps] power and db

[Carl]

----- Original Message ----- 
From: "DAVE WHITE" <mausoptik at btinternet.com>
To: "AMPS" <amps at contesting.com>; "Paul Kraemer" <elespe at lisco.com>
Sent: Wednesday, February 04, 2009 3:31 PM
Subject: Re: [Amps] power and db


> Probably so - in theory - and a conservatively run amp will run for 
> far longer than one which is being thrashed to death. The amp that's 
> on the bench for repairs or awaiting components when KP1 (the last one 
> I need) comes on the air is of no use to me.
>

Thats why I have an old MLA 2500 for backup!


> However - in a quote I believe was atttributed to a certain Prof. A. 
> Einstein - "In theory, theory and practice are the same thing. In 
> practice they're not."
>
> In practice I'm sure that the human ear can discern a couple of dB if 
> the signal is marginal. In theory this would be nonsense but it seems 
> to hold true for me particularly on 160m.

Many, many tests have been run and a good ear can hear a 1.5dB change. 
As another 160M DXer as well as VHF and above I believe it.


> The Hot-Rodders all tell us that there's no substitute for cubic 
> inches and I personally don't believe there's any substitute for Watts 
> ERP.


Size matters <G>

>
> Get it however you can, I think those little watts all count. They 
> certainly do in Europe where we have to compete with the 
> Italians......
>

We have the Canadians


> cheers
> Dave G0OIL

Carl
KM1H


>
> --- On Wed, 4/2/09, Paul Kraemer <elespe at lisco.com> wrote:
> From: Paul Kraemer <elespe at lisco.com>
> Subject: [Amps] power and db
> To: "AMPS" <amps at contesting.com>
> Date: Wednesday, 4 February, 2009, 4:26 PM
>
> Did I miss something in school? Probably. All the discussions on 
> modifying
> linears for a few more watts seems ridiculous, or at least frivolous. 
> db=10
> log P1 /P2 still applies doesn't it?
> Double the actual output power rating of that fine L 4 or SB220 from 
> 1000 w
> to 2000 w will only increase your signal strength on the receiving end 
> by
> 3db, 1/2 s unit.
> IF you could increase your output fourfold, 4000 watss output (that 
> would be
> illegal) you would only gain one S unit.
> Attempt to do either and you will only exponentially increase your 
> problems.
> Have all the fun you want but increasing output on a kw linear by a 
> couple
> hundred watts just doesn't improve anything.
> Like the man says, work on your antenna where you can make a 
> difference.
> And, if you are really disappointed with that L4 or SB220 you could 
> send it
> here. I'd like it just the way it is.
> Paul K0UYA
>
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