Ramsey Electronics QRP-80 Manual de instrucciones descargar pdf (Pagina 18)

HR-80• 18

you receiver on for a few days, just like we leave our computers and

Ham gear on all the time? (2) We thought you’d have more fun

planning and installing your own lamp that glows in the dark!

TROUBLESHOOTING TIPS:

PROBLEM: ALL signals are chirpy and unstable.

SOLUTION: Sorry to have to say it , but this condition is only caused

by a weak battery! Use a fresh alkaline cell. Any strong

signal forces the audio circuit to rob voltage from the

oscillator, which causes the instability.

PROBLEM: Occasionally good but erratic operation.

SOLUTION: Check very carefully for a poor solder connection.

PROBLEM: Signals have an unpleasant hissing pitch.

SOLUTION: Try a different set of headphones, different speaker or

external audio amplifier. Some cheap headphones

designed for casual music listening have an

undesirable filtering effect on CW signals.

PROBLEM: Oscillator inoperative or wrong frequency.

SOLUTION: In addition to checking solder joints, be sure that L1 is

oriented correctly and that C1, C2, C3 and C4 are

installed in correct positions.

PROBLEM: Loud AC hum or buzz.

SOLUTION: If you are using the receiver with a battery or simply for

listening (i.e.: not connected to a transmitter or a AC

power adapter), these are likely causes of the AC hum:

• No ground connection.

• Receiver located too close to an AC device such as an

older electric clock, AC-powered radio, etc.

• Antenna very close to a power cord or house wiring. If

your receiver is being used with a transmitter, the

transmitter power supply may be the source of the

unwanted AC hum. If you are using a 9-volt AC power

adapter, the adapter design may not be of sufficient quality

for this application. Try a bypass capacitor, or a different

adapter or a well-designed and filtered DC power supply.

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Ramsey Electronics QRP-80 Manual de instrucciones Pagina 18