Champion 73536i Manual del operador descargar pdf (Pagina 5)

QST – Devoted Entirely to Amateur Radio www.arrl.org June 2012 53

respond, the increased load

disappeared. Keying slowly, I

could make all but the Generac

make the sound of a grunt or

laugh. Also, the line voltage

would momentarily dip while

keying; the Generac responded

poorly to this test by speeding up

and slowing down in an erratic

manner. Though no chirp was

detected in my test receiver, I did

this test with only one transmit-

ter. I suspect some transmitters

may wobble in frequency or

chirp with a momentary voltage

dip. I would recommend leaving

ECONOMY mode off so that the

engine runs at a higher speed,

ready for a momentary increase

in load while transmitting.

An option is to use the generator to operate

one or more battery chargers and run all

transceivers from battery power. That way it

is possible to take advantage of the

ECONOMY

mode, provided that the generator output is

filtered, which leads me to the next topic.

Conducted Emissions

The biggest finding of this review is the high

Figure 2 — Conducted emissions from the Yamaha EF2000iS inverter generator

with no ﬁltering (blue line), a commercial Corcom ﬁlter (green line) and a ﬁlter built

in the ARRL Lab (purple line).

Manufacturer: Yamaha Motor Corp,

6555 Katella Ave, Cypress, CA 90630; tel

800-962-7926; www.yamaha-motor.com.

Conclusions and Observations

A radio amateur’s requirements for portable

power are different from those of the average

user. A homeowner’s generator, acting as a

backup power supply, usually works with

fairly static loads. Power demand usually

stays at one level for a while. On the other

hand, a generator used for powering an SSB,

AM or CW station is faced with a dynamic

load, one that changes rapidly with modula-

tion or on/off keying. How do these genera-

tors respond to dynamic loads?

I set up a 200 W transmitter and 300 W of

incandescent lighting. With

ECONOMY mode

on, 300 W is just below the threshold of

increased engine rpm. As I keyed the trans-

mitter, each generator would try to respond to

the increased load by momentarily trying to

raise its rpm. Before the engine speed could

conducted emission levels of these inverter

generators. My little 1000 W conventional ac

generator has very low conducted emission

levels, but the output waveform has a har-

monic in it and is not nearly as clean as the

inverter output. As with inverters used to

generate ac from batteries, inverter genera-

tors are power generating devices and don’t

plug into a wall outlet, so they are not held to

FCC Part 15 conducted emission level limits.

There are two ways to attack this problem

— buy a commercially made filter or build

one. Figure 2 shows the Yamaha’s conducted

emission with no filter, with a commercially

made filter made from Corcom (www.cor.

com), and with a homemade filter whipped

up by the ARRL Lab’s RFI expert, Mike

Gruber, W1MG. Most of the conducted

emissions are common mode, though some

is also differential mode. The amount of each

mode may vary with different model inverter

generator. Mike believes with some experi-

mentation, patience and some 2.4 inch

diameter type 31 toroids (www.fair-rite.

com), the owner of an inverter generator can

greatly reduce the conducted emission level.

More information is available online at www.

arrl.org/products-and-other-information

(click on AC Line Filters).

Click to see

an overview of

four portable

generators

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Yamaha EF2000iS, s/n 7DK 1516423

Engine: four stroke, single cylinder, 79 cc.

Fuel capacity: 1.11 gallons.

AC output: 120 V at 60 Hz.

Power output: 1600 W, 2000 W maximum.

DC output: 8 A at 12 V dc (battery charger).

Weight: 44 pounds (dry).

Size (HWD): 17.9 × 13.3 × 11.0 inches.

Price: $990

Lab Testing: Load Test, Eco On

Load Output Frequency Sound Level*

(W) (V ac) (Hz) (dBa)

0 124.6 60 59.9

100 124.3 60 60.0

250 122.7 60 60.0

500 123.0 60 62.4

1000 121.5 60 66.8

1500 120.1 60 71.0

1600 119.6 60 71.0

Eco off No load 67.4

Fuel efﬁciency: 5.347 kWh/G

*See text.

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