At 23:54 11/27/02 +0000, on4kj wrote:
>Dont think its right Jerry.
>Max. power rules are so different all over the places, Yaesu would certainly
>costumise for some other countries.
>Even at 30 Mc/s power is going down, compared with 1.8 Mc/s.
Actual data I just measured:
Band Current Voltage Output RF watts
20 43 48 900
10 35 48 900
Doesn't appear to "go down" from 20 to 10 - don't know about 160.
Don't misunderstand - I am not saying anyone should run these amps "on the
ragged edge". What I am saying is that if anyone has wondered about the 500
w limit, there _may_ be a logical explanation for it based on Japan's ham
regulations moreso than on what this amp is conservatively capable of.
>So probably they won't take any risk.
>Do you realy think Radio Amateurs would not try to modify whether they are
>japanees or not.
>I agree with Carol, those who are only good users should KEEP THEIR HANDS
>OFF, but thats from the point of vieuw of a professional.....I used to be
>in charge of a after sales service for 25 years. Now retired since 99, did
>things change that much since ?
>----- Original Message -----
>From: "Jerry Flanders" <firstname.lastname@example.org>
>To: <email@example.com>; <firstname.lastname@example.org>; "Carol L Maher"
>Sent: Wednesday, November 27, 2002 10:21 PM
>Subject: Re: [Yaesu] Quadra, power increase
> > 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
> > 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
> > 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 <email@example.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
> > > >comes
> > > >to it's power handling capabilities. On the other hand I have worked
> > > >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
> > > >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
> > > >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
> > > >operation".
> > > >
> > > >There is an old saying in electronics and it still holds true
> > > >"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: <firstname.lastname@example.org>
> > > >> From: "Dave Richards" <email@example.com>
> > > >> To: <firstname.lastname@example.org>
> > > >> 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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