From: Rick Wakatori <7l1rll@dp.u-netsurf.ne.jp>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <20091210100700.32DEC31E703@smtps01.kuleuven.be>
References: <57a24ca70912090730q682ffc79g7ffa9582e0cc40fa@mail.gmail.com>
	 <20091210100700.32DEC31E703@smtps01.kuleuven.be>
Organization: RLL
Date: Thu, 10 Dec 2009 20:33:41 +0900
Message-Id: <1260444821.6353.65.camel@vaio3rd>
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Subject: Re: LF: AW: TX-2200A
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 I agree Rik's observation on the 100W limitation.

 Average CW operator is a KEY-technician without any science.
A good earth is essencial for LF operation, otherwise would get LF shock
at frame of transmitter.
 Linear amplifier is based on self responsibility.

 There is another reason in a market place for such tranceiver in JP.
100W/50W machine has much wider, say 100 times, of market place than 1KW
machine.

 In any way, there is still a high wall in front of a operator who
bought the machine, such tuner, good earth, good antenna and etc.=20

 In any way, I will operate QRSS60 using TX2200A/50W at 137780Hz+-1Hz in
a peak of peninsular from 01:00UTC to 02:30UTC on coming Sunday,December
13,20 or 27 depending on crimate.
73,
--=20
-.. .  --...  .-.. .---- .-. .-.. .-.. .-.-.
7L1RLL under ubuntu/Linux in Kawasaki,Japan(JP)
URL=3Dhttp://www1.u-netsurf.ne.jp/~7l1rll/radio.html
-..--- -.- .-.. ..-.. --. --. ...- .-... ...-.
On Thu, 2009-12-10 at 11:07 +0100, Rik Strobbe wrote:
> Stefan,
>=20
> there is one good reason to limit the output=20
> power 100W: more power could become lethal (high antenna voltages / curr=
ents).
> The "black box operators" must be protected=20
> against this danger, otherwise they might go QRT due to "natural selecti=
on" :-)
>=20
> 73, Rik  ON7YD - OR7T
>=20
> At 10:19 10/12/2009, you wrote:
> >Warren, LF,
> >Tnx for the info!
> >I am not "afraid" that now many OMs come on the=20
> >band who just bought their rig, like on HF. Even=20
> >if you could buy a loading coil, you never will=20
> >get qrv satisfactorily cause you always have to=20
> >consider many things like the earth, the local=20
> >noise reduction, the impedance transformation to 50 Ohm and so on.
> >These OMs, even if they could buy a automatic=20
> >tuner (that would not be easy to create as a=20
> >commercial product) for LF, would be frustrated=20
> >soon cause there are no contests and no 100s of=20
> >stns calling on the band ;-) They would say "LF=20
> >is dead, just nerving qrm" and would never get=20
> >the fascination that we all experience.
> >Finally I don't understand why this PA has just=20
> >100W. To reach 1W ERP, most LFers have to apply=20
> >1kW and more, so 100W is QRP on LF ;-). 1kW can=20
> >easily be reached on LF without using expensive=20
> >special transistors and drivers and ferrite=20
> >cores. E.g. with one simple IRFP360 we can built=20
> >a 1kW high efficiency calss d or e PA that costs not even 50=E2=82=AC..=
.
> >These difficulties to get qrv is one part of the=20
> >LF hobby and if they are solved, one can be glad=20
> >even without doing 100s of qsos in one evening :-)
> >
> >Stefan / DK7FC
> >-----Urspr=C3=BCngliche Nachricht-----
> >Von: owner-rsgb_lf_group@blacksheep.org=20
> >[mailto:owner-rsgb_lf_group@blacksheep.org] Im Auftrag von Warren Ziegl=
er
> >Gesendet: Mittwoch, 9. Dezember 2009 16:30
> >An: rsgb_lf_group@blacksheep.org
> >Betreff: LF: TX-2200A
> >
> >Interesting new rig offered by Waters and Stanton - the TX-2200A 100
> >Watt class D transmitter for 136kHz - VFO controlled with receiver
> >muting.
> >Made in Japan, relatively pricey though at 690 GBP!
> >
> >http://wsplc.com/pdf/TX-2200A.pdf
> >
> >
> >
> >73 Warren K2ORS
> >                 WD2XGJ
> >                 WD2XSH/23
> >                 WE2XEB/2
> >                 WE2XGR/1
>=20
>=20