Ramsey Electronics FZ-146 Specifications download pdf (Page 9)

FX-146 • 9

DC POWER SUPPLY CONSIDERATIONS :

Your Ramsey FM Transceiver is designed to operate from any stable DC

voltage source in the 12 to 15 volt range, from typical car, boat or plane 12V

systems to a wide variety of battery packs or AC-powered DC sources. In a

pinch, you can get on the air for quite a while with 8 to 10 ordinary "D" cells!

Our lab tests show only a .93 amp current draw for 5 watts of RF output. We

have just a few points of advice and caution:

1. Your DC supply should be able to provide a minimum of 1.0 amperes in

continuous service.

2. Any battery setup capable of supplying 12-15VDC will serve quite well.

3. Use of wall plug power supplies is NOT recommended. Obviously,

12VAC output is not suitable. Most DC output units do not have

adequate voltage regulation.

4. Turn your transceiver OFF before re-starting the vehicle in which it has

been installed.

5. Replace F1 only with a 1 amp fuse.

6. If you power your transceiver from the +12V accessory voltage available

from other equipment, be sure that source is rated for the 1 amp

required.

7. Your transceiver circuit includes noise suppression at the DC input and

additional filtering at the VCO, primarily to prevent ignition/alternator

noise from being introduced into the FM modulation. If you hear ignition

noise in the receiver, the vehicle has a serious general problem. Check

your transmitted signal on another receiver before mobile operation.

Radio Shack sells a variety of noise-suppression capacitors and

chokes. The ultimate solution, which has been tested, is to run the

transceiver from a smaller accessory battery.

If you plan to build a power supply for fixed-station use, there are numerous

construction articles in ham and electronics hobby publications. A

convenient new book featuring easy-to-find components and clear

explanations is Building Power Supplies (Radio Shack 276-5025.)

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Ramsey Electronics FZ-146 Specifications Page 9