Hello,
Jukka, OH6LI, just about nailed it for keeping or returning the contests LP
max. output to 100W.
73,
Mike, K4GMH
On Tue, Jul 4, 2017 at 9:39 AM, Jukka Klemola <jpklemola@gmail.com> wrote:
> 100W output is adequate for nearly all today's transmitters.
>
> IMD properties for the expensive transceiver boxes are much better than at
> 200W out.
> These hams set the power output to 100W. They set it to 100W because they
> can.
> Everything is well inside the specifications.
>
> For the hams with less fortune, 100W is just the right amount of power so
> they get all juice out of the power supply and radio stays operational
> through the contest.
> Everything is just within the specifications.
>
> Then there are the hams with less fortune but plenty creativity, who modify
> their transceivers and force the power supply to output overly much
> current.
> Everything outside specifications.
>
> The power meter shows 124 Watts! Sad side is the 24 Watts is all over the
> band, not on the 'output channel'.
>
> Their output is outside the specifications.
> They spread around the bands with overly spreading signal. In engineering
> terms, they show much poorer IMD spec.
> Their radios suffer all kinds of symptoms and the radio lifetime expectancy
> is often less than a contest.
>
>
> There sure is logic in 100W limit.
> 100W limit suits the typical hams just fine.
>
>
>
> Frank dives into memories .. year .. year 1982.. crystal controlled
> transmitter. 4.5 or maybe 5W out of a BLY88.
>
> I like more the modern radios with frequency dials than my first XTAL TX.
>
>
> 73,
> Jukka OH6LI
>
>
> 2017-07-04 8:13 GMT+03:00 <donovanf@starpower.net>:
>
> > In 1959, my first Field Day, 150 watts input power was one of the
> > multiplier categories.
> >
> > During the 1960s it was hanged to 200 watts input power
> >
> > Twenty years later is was changed again, to today's 150 watt output power
> >
> > 73
> > Frank
> > W3LPL
> >
> > ----- Original Message -----
> > From: donovanf@starpower.net
> > To: John Geiger <af5cc2@gmail.com>
> > Cc: CQ-Contest Reflector <cq-contest@contesting.com>
> > Sent: Mon, 03 Jul 2017 17:39:47 -0400 (EDT)
> > Subject: Re: [CQ-Contest] `150 watt limit question
> >
> > Back in the 1950s and 1960s a pair of 807s or 6146s ran 150 watts INPUT.
> >
> > 73
> > Frank
> > W3LPL
> >
> > ----- Original Message -----
> > From: John Geiger &lt;af5cc2@gmail.com&gt;
> > To: CQ-Contest Reflector &lt;cq-contest@contesting.com&gt;
> > Sent: Mon, 03 Jul 2017 13:19:36 -0400 (EDT)
> > Subject: [CQ-Contest] `150 watt limit question
> >
> > It appears that for the ARRL contest, and maybe for CQ contest, 150 watts
> > is the break point between high and low power. Does anyone know why that
> > limit was set? It would seem that changing it to 200 watts would make
> more
> > sense, in that low power would be barefoot, and high power would be with
> an
> > amp (or with a Yaesu FTDX9000MP barefoot).
> >
> > It seems that there are 3 radios that doe 150 watts barefoot-the Kenwood
> > TS950, the Icom 781, and the JRC JST-245.
> >
> > There are quite a few radios that do 200 watts barefoot-Yaesu FT1000D,
> > Yaesu FT1000MP MK5, Yaesu FT2000D, Yaesu FTDX9000D, Yaesu FTDX9000C,
> Yaesu
> > FTDX5000, Icom 775, Icom 7800, Icom 7700, Icom 7851, Kenwood TS990.
> >
> > That is one reason why 200 watts seems to be a more logical dividing
> point,
> > but what do I know?
> >
> > 73 John AF5CC
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