Stefan,
there is one good reason to limit the output
power 100W: more power could become lethal (high antenna voltages / currents).
The "black box operators" must be protected
against this danger, otherwise they might go QRT due to "natural selection" :-)
73, Rik ON7YD - OR7T
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
band who just bought their rig, like on HF. Even
if you could buy a loading coil, you never will
get qrv satisfactorily cause you always have to
consider many things like the earth, the local
noise reduction, the impedance transformation to 50 Ohm and so on.
These OMs, even if they could buy a automatic
tuner (that would not be easy to create as a
commercial product) for LF, would be frustrated
soon cause there are no contests and no 100s of
stns calling on the band ;-) They would say "LF
is dead, just nerving qrm" and would never get
the fascination that we all experience.
Finally I don't understand why this PA has just
100W. To reach 1W ERP, most LFers have to apply
1kW and more, so 100W is QRP on LF ;-). 1kW can
easily be reached on LF without using expensive
special transistors and drivers and ferrite
cores. E.g. with one simple IRFP360 we can built
a 1kW high efficiency calss d or e PA that costs not even 50?...
These difficulties to get qrv is one part of the
LF hobby and if they are solved, one can be glad
even without doing 100s of qsos in one evening :-)
Stefan / DK7FC
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Warren Ziegler
Gesendet: Mittwoch, 9. Dezember 2009 16:30
An: [email protected]
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
|
