Ramsey Electronics HR40 Manual de Instruções descarregar pdf (Página 28)

FHT-1 • 28

Amateur radio magazines and handbooks provide a variety of circuits for RF

wattmeters and relative field-strength indicators, including methods of using

your VOM as an indicating device. CQ magazine for March 1990 offers an

article by KB4ZGC on how to make a highly accurate yet inexpensive

dummy load and wattmeter capable of showing 1/10-watt differences in RF

power. If you use a wattmeter characterized for the HF frequency region, it

will not give accurate results at the much higher two meter frequencies,

although it will be quite adequate for go/no-go testing.

YOUR POWER SUPPLY AND RF OUTPUT POWER

For optimum performance, one or two volts of extra DC supply power can

make quite a difference in any transmitter. For example, two lantern batteries

in series, or 8 "D cells" will obviously provide "about 12 volts" with sufficient

current capability for casual operating. For maximum RF output power, use a

supply of 13 to 14 volts DC. The easiest method is to place two fresh "D

Mode DIP Switch

(1=on)

Time

OFF

Power

out

Toggle

Power

45 sec.

Timer ON

Tone

0 0 0 0 0 user user user user user

1 0 0 0 1 0 High N N N

2 0 0 1 0 0 High N Y Y

3 0 0 1 1 4 High N Y Y

4 0 1 0 0 4 Low N Y Y

5 0 1 0 1 4 High Y Y Y

6 0 1 1 0 4 High Y Y N

7 0 1 1 1 4 High Y N N

8 1 0 0 0 8 High N Y Y

9 1 0 0 1 8 Low N Y Y

10 1 0 1 0 8 High Y Y Y

11 1 0 1 1 12 High Y Y N

12 1 1 0 0 12 High Y N N

13 1 1 0 1 24 High Y Y Y

14 1 1 1 0 60 High N Y Y

15 1 1 1 1 60 High Y N N

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 34

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Ramsey Electronics HR40 Manual de Instruções Página 28