1. With time goes on (a year or a couple
of years) I noticed "absence" of the antenna when just
switching on the air. But it returns back right after transmitting
even with the lowest power out of transceiver. The reason was
the oxidation of open silver coated contacts of the relay, though
the box is waterproof construction. Replacement by the relay of
the same type, but with other coating, reduces probability of
this problem by 90 percent but nevertheless it's rare, but happens.
Because of this I would recommend to use vacuum relay instead
of the open relays, B1B (http://www.nd2x.net/B1B.html
) for example.
2. Since capacitors are connected to "the
hot ends" of the matching network, during transmition there
can be rather significant voltages (up to 1KVpp at 100W). I used
) doorknob capasitors (pulse type, reactive power is not normalized)
5-10KV. At such power, KVI are stable enough, but at rated voltage
can be heated considerably and, accordingly, can make troubles...
If power were greater than 100W I would recommend using K15-U (http://www.nd2x.net/Russ-caps/cap-en.htm
) capacitors of proper reactive power.
Referring to HAMRADIO, any aerial
(however transceiver, PA or computer) is only the tool for carrying
out QSO. The tool can be effective or not so, Japanese or home-made,
etc. (whatever one likes), but it is not the defining factor!
These tools can only raise an overall performance of the operator,
but not replace it in any way. And even in digital modes RTTY
and PSK, I don't mean CW, it's up to the operator,
where, when and how, but though uninitiated peoples would think
it is all up to computer. And those operators who care only for
his gears in the shack, even if it's the best piece of equipment,
"are well audible". I mean: I would prefer not hear
them at all. So let's improve both the equipment and the qualification
of the operator, in fact this harmony is the sense of HAMRADIO!