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GR1225 No power output... HELP!!!

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WQOC472

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Joined
May 4, 2010
Messages
264
Location
USA
Hello all,

My GR1225 repeater I use for GMRS wont put out any transmit power all of a sudden. It had been working flawlessly for around 3 months. I have it set on 25 watts, running Andrew LDF4-50A hardline to a 6db omni on a 40 foot mast. i was about a mile away (I usually have a good 7-10 mile range) and tried to key up on the repeater and I couldn't hit it.

I went to the repeater location and keyed up on my handheld and i did hit the repeater but it was very faint (almost like i was keying up on a repeater that was just barely in range) it also sounded like I was talking down a tube at times from the audio i was barely able to hear from another handheld i had with me. I went inside to the actual repeater it self and stood right beside the unit and keyed up again and it sounded just fine, like it would on a normal day. i walked out of the room and stood about 20 feet from the actual repeater it self and it was very faint and again.

I checked all the connections, they were fine. i shut off the repeater and turned it back on and still have the same result. Any suggestions?

Thanks!
 

firefive76

Member
Joined
Jun 4, 2008
Messages
401
Location
Kansas
Hello all,

My GR1225 repeater I use for GMRS wont put out any transmit power all of a sudden. It had been working flawlessly for around 3 months. I have it set on 25 watts, running Andrew LDF4-50A hardline to a 6db omni on a 40 foot mast. i was about a mile away (I usually have a good 7-10 mile range) and tried to key up on the repeater and I couldn't hit it.

I went to the repeater location and keyed up on my handheld and i did hit the repeater but it was very faint (almost like i was keying up on a repeater that was just barely in range) it also sounded like I was talking down a tube at times from the audio i was barely able to hear from another handheld i had with me. I went inside to the actual repeater it self and stood right beside the unit and keyed up again and it sounded just fine, like it would on a normal day. i walked out of the room and stood about 20 feet from the actual repeater it self and it was very faint and again.

I checked all the connections, they were fine. i shut off the repeater and turned it back on and still have the same result. Any suggestions?

Thanks!
Do you have any way to check the power out? I'd guess that you probably lost your PA.
 

kayn1n32008

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Sep 20, 2008
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5,650
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In the \'patch
Wirelessly posted (Mozilla/5.0 (BlackBerry; U; BlackBerry 9780; en-US) AppleWebKit/534.8+ (KHTML, like Gecko) Version/6.0.0.600 Mobile Safari/534.8+)

Yea, sounds like the PA gave up the ghost. Before replacing, make sure that the duplexer is still in tune, the cables are electrically and, Rf wise, still good before puTting it back in service
 

n2hbx

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Premium Subscriber
Joined
Dec 23, 2004
Messages
277
Location
Orlando, FL
Gr1225 pa

Take the PA out and resolder the collector of the final.
Be sure to suck out the old solder before you resolder it, just to make sure you have a good, clean connection. Also check the solder joints at the chip capacitors around the transistor. These commonly crack as well. And, in case you haven't already, flip the switch on the power supply so the fan runs all the time. If you're lucky, the PA hasn't burned up too badly to be fixed. The whole PA module with heat sink can be changed out as a unit, but you have to literally take the entire repeater apart to get it out. It's not that hard, just time-consuming.

The 1225 would be a great little unit if it weren't for the crappy PAs.

Larry
 

WQOC472

Member
Joined
May 4, 2010
Messages
264
Location
USA
Thanks for the help everyone, i plan on taking it apart this evening and looking through it.
 
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