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?
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.
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.
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something inside radio is shorting out. Could be the speaker.take an external speaker and plug it into the plug in back and see if it dtill does it.If it does its the speaker.
The mixer crystal is unstable. It may need replacing. Some times you can reset them. Take a soldering iron and heat up the mixer crystal up for about 5-7 seconds. See if this stabilizes it. If the radio still drifts,then you need to replace the mixer crystal.
if you have another radio put it right next to the 2547. turn on the monitor radio with no antenna on the same channel and key the 2547. if you can hear it the final transistor is bad. let me know if that worked
What is the power output on a watt meter telling you? if it is up above an 8 watt dead key with the rf power turned all the way down, someone has turned up the radio inside and you will ned to turn it back inside to get about a 2 or 3 watt dead key with the rf power turned all the way down on the outside knob on the face of the radio. to do this, you will need to locate the VR18 pot for low power on am/fm and the VR14 pot for high power on am/fm and adjust accordingly, you are most likely overdriving the radio in some way and if you are not familiar doing this sort of thing, then my suggestion would be for you to take it to your nearest electronics repair tech and have them do it for you. It is not a costly procedure and you will be better off to have an experienced tech in there. Also if you are running a power mic on it, try turning it down some or going back to the stock mic to see if the problem persists. If it does while running the stock mic, then most likely it's internal issues like the one explained above.
Can't help you there. It's most likely that you screwed the modulator up by extending the frequency range. I used to work for Galaxy and I know what happens to a radio when amateurs try to modify them (no offense). If you modify a high power radio such as your Super Star, you're bound to have modulation and SWR problems. In expert advice, never do amateur radio modifications to a high power radio. If you want a more versatile radio, get a Galaxy DX 2517 CB base station. The DX 2517 has PA/FM/AM/SSB/USB/LSB/CW modes, and bands A-F, and a frequency range from 25.615 to 29.205 MHz. The Galaxy DX 2517 has modifications that can be done right at the factory, they are optional however. The only thing I find annoying with the DX 2517 is that it's bulky, it leaves no room for any competition. When it was designed, the engineers left space saving out of the question. Anyway, Good luck and Best Regards, Gavin93
everyone hears me loud an clear but about 50% hum
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