Question about Galaxy Radios DX-2517 CB Radio

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DX-2517 AC HUM

HELLO GUYS.
I HAVE A GALAXY 2517. IT HAS A AC HUM IN BOTH RECIEVE AND TRANSMIT WITH NO POWER LOS IN EITHER. I READ ABOUT THE TRANSISTOR (TR 602) Oscillating. I CHECKED ITS BEEN DONE AT FACTORY. IN FACT ALL THE Symptoms and Cures HAVE ALREADY BEEN DONE.FACTORY. IS THERE ANOTHER COMMON PROBLEM RELATED TO THIS?

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  • Anonymous Mar 27, 2008

    everyone hears me loud an clear but about 50% hum

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  • Master
  • 6,966 Answers

Hi,

As you posted/described, internal work had been done at the factory then perhaps the source/cause of the AC hum is external.

If the unit is being used as a base with a regulated power supply, then the power supply has to be checked. This would include the big capacitor, the diodes and the regulator transistors. On certain occasions, loose transformer E core can also cause the hum.

There are also instances that other electrical devices can cause the hum, these can include fluorescent lamps, air purifiers, dehumidifiers and others.

In some cases, it can be loose grounding of the antenna mount or the braided/shield wire solder to the PL-250 connectors.

If it were mobile, then the antenna grounding is also a possibility. If the hum is higher than 60Hz and goes with the engine RPM, then the alternator of the vehicle has to be checked.

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Feb 05, 2008

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  • Contributor
  • 66 Answers

The Hum that you hear is most likely the AC drawing in too much power, or it went bad, in any case, here are a few things you can try to reduce the hum you hear. Try switching the NB/ANL switch on, this will cause external interference to dicipate. Or try replacing the unit's power supply, this could affect the performance in a positive or a negative way depending on the quality of the AC component that you buy. Or you can try cooling fans, the cooling fans will allow more air flow to the unit so it can stay cool, the cause of the hum may be coming from the AC because it is overheating, keep the radio cooled for higher performance. The most drastic thing you can do is use a votage step-down adapter. The voltage step-down adapter reduces the amount of power that is supplied to the radio which in turn may cause the hum to be reduced, however the radio's range and power are also reduced dramatically.

Hope this helps!

Posted on Jul 02, 2008

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Super Star 3900 GHP


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Anyway, Good luck
and
Best Regards,
Gavin93

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