One other thought - I have a Quadra and wondered why both it and the ICOM
PW-1 have a 500 watt 6-meter limit. It is apparently political. I was
poking around the web one day and discovered the Japanese power limits on 6
meters is 500 watts. Apparently ICOM and Yaesu rate their products at that
level to not encourage illegal (at home) QRO operation. If and when I
actually put up a 6 meter antenna, I will be using a full KW from my Quadra
when I need it.
Jerry W4UK
At 16:04 11/27/02 -0500, Dave Richards wrote:
>Well Put Carol !
>And your points are noted I will leave well alone
>Dave
>W1QB
>
>11/27/2002 1:00:08 PM, Carol L Maher <w4clm.ham@juno.com> wrote:
>
> >Dave,
> >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
> >equipment
> >like this would you even consider attempting to push the envelope when it
> >comes
> >to it's power handling capabilities. On the other hand I have worked on
> >several
> >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
> >Ohm
> >combiner network for the full 1Kw output. I realize that the Quadra
> >does
> >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
> >forum
> >or from any other amateur off the street to be better than that from the
> >Yaesu
> >Engineers who designed that amplifier ???? When ever any piece of
> >electronic
> >equipment is designed, there is a certain amount of headroom built into
> >the
> >equipment design for reliability, voltage variations, and component
> >reliability.
> >Note the statement below from the Yaesu web site: "for years of reliable
> >operation".
> >
> >There is an old saying in electronics and it still holds true today.....
> >"IF IT WORKS --- DON'T FIX IT "
> >Regards
> >Carol L. Maher
> >W4CLM
> >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
> >
|