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[Yaesu] Quadra, power increase

To: <yaesu@contesting.com>
Subject: [Yaesu] Quadra, power increase
From: wr3i@earthlink.net (Dave Richards)
Date: Wed, 27 Nov 2002 16:04:09 -0500
Well Put Carol !
And your points are noted I will leave well alone

11/27/2002 1:00:08 PM, Carol L Maher <w4clm.ham@juno.com> wrote:

>I do not own a Quadra, but I have had a chance to play with a one.
>So that makes me think, why on earth if you own a beautiful piece of
>like this would you even consider attempting to push the envelope when it
>to it's power handling capabilities.  On the other hand I have worked on
>1 Kw solid state amplifiers made by ITT Mackay Marine while I was
>aboard a merchant going container vessel.   If the Quadra is
>built in a similar manner as the Mackay amplifier,  then they are using
> 4- banks  with 2- transistors in each bank / circuit going into a  50
>combiner network for the full 1Kw output.   I realize that the Quadra
>not use power transistors per-say.... however it is using Power MOSFETs
>in a push pull design.
>Consider this before you push the limits of your amplifier or any rig for
>that matter.  Do you honestly feel the advise you will receiver on this
>or from any other amateur off the street to be better than that from the
>Engineers who designed that amplifier ????   When ever any piece of
>equipment is designed, there is a certain amount of headroom built into
>equipment design  for reliability, voltage variations, and component
>Note the statement below from the Yaesu web site: "for years of reliable
>There is an old saying in electronics and it still holds true today.....
>Carol L. Maher
>Charlotte N.C.
>Innovative Ouadra Push-Pull RF Design for 1 kW of MOSFET Power!
>Yaesu's engineers have conquered the challenging task of providing
>high power output from 160 through 6 meters!* Yaesu's exclusive
>Quadra Push-Pull design utilizes 8 rugged MRF-150 MOS FETs for
>years of reliable operation. 
>> Reply-To: <wr3i@earthlink.net>
>> From: "Dave Richards" <wr3i@earthlink.net>
>> To: <yaesu@contesting.com>
To: <yaesu@contesting.com>
>> Date: Tue, 26 Nov 2002 19:31:46 -0500
>> Subject: [Yaesu] Quadra question?
>> I have heard that one can get 1500 watts out with a quadra how does 
>> one do
>> that and is it safe
>> Dave
>> W1QB
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