Specifications

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If you suspect that there is a problem with your transmitting equipment,

here is a simple test that you can perform to find out if your station equip-

ment is operating properly. All that is required is some hook up wire, a PL-

259 connector, 2 alligator clips, a lamp socket, 100 watt lamp or a minimum

200 watts for 500 watt system (two may be paralleled if necessary), and

adapters as shown in the diagram. In a real emergency, you can simplify

this arrangement to suit the materials that you have on hand.

1 - The light bulb test is used to verify basic operation of the transmitter,

and antenna coupler. The lamp will present a load to the transmitter, and

antenna coupler that is similar to an antenna. This test will provide a visual

indication of the power output from the transmitter, and verify operation of

the antenna coupler.

2 - The transmitter should be tested first. Note that the lamp may be dim on

some frequencies. This is because the lamp is not an ideal load for the trans-

mitter, and the SWR protection circuitry in the transmitter will automatical-

ly reduce transmitter power. If the lamp does not light on any frequency,

there is high probability that the transmitter is in need of service, and

there is no need to proceed to the coupler test.

3 - If the transmitter passes the test, proceed to the 'coupler test procedure'.

Make sure that the antenna and ground are first disconnected from the cou-

pler. Note that you should be able to hear the relays clicking in the coupler

as the tuning cycle begins. This should stop within a few seconds, and the

lamp should light brightly. If you are using the tuned indicator option, it

should illuminate when the coupler is tuned.

4 - This test should be repeated on all bands of intended operation. Note that

the coupler will probably not tune the lamp from memory. This because the

impedance of the lamp changes with temperature, and therefore presents a

dynamic load to the coupler.

5 - Note that the lamp will not be as bright on the higher frequencies. This

is due to the fact that some radiation from the hook up wiring will occur on

the higher bands, that is, some of the power will go 'on the air' and not be

available to the lamp.

SG-235 Manual

SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USA

P.O. Box 3526, 98009 Fax: 425-746-6384 Tel: 425- 746-6310 or 1-800-259 7331

E-mail: sgc@sgcworld.com Web site: http://www.sgcworld.com