| Author |
Message |
    
Cobra
| | Posted on Saturday, December 28, 2002 - 7:43 pm: | 
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I Just Got this amp from a Friend. This Amp transmits Very good i get alot of watts but to turn on the light on the meter i have to click the ssb button a few times In Then when i transmit the Receive goes dead. Then when I turn off the amp the receive comes back on.
Any Suggestions?
Thanks
Cobra |
bruce
| | Posted on Saturday, December 28, 2002 - 10:11 pm: |
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sounds like a bad TR relay |
cOBRA
| | Posted on Saturday, December 28, 2002 - 11:22 pm: |
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Is It Hard To change? Is it worth it. can i change it my self? Were do i get one? |
bruce
| | Posted on Sunday, December 29, 2002 - 7:04 am: |
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i dont own one but my guess is its a double pole double throu relay probly a 12 v DC coil and you could get one from a good electronic supply house |
307
| | Posted on Sunday, December 29, 2002 - 7:40 pm: |
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Nope...Replace both small transistors (most likely 2N4401 or 2N2907). This will fix the problem...
307 |
Cobra
| | Posted on Sunday, December 29, 2002 - 8:52 pm: |
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Are they easy to install it is worth it? How much are they? |
bruce
| | Posted on Sunday, December 29, 2002 - 9:09 pm: |
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2907? is this a know problem? intresting |
307
| | Posted on Sunday, December 29, 2002 - 11:16 pm: |
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Yes it is...Expensive????MASSIVE cost , about .60 cents a piece at Rad-Shack...Hard to put in? About 10 minutes...
307 |
Cobra
| | Posted on Monday, December 30, 2002 - 1:30 am: |
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I Sent You A Message Through Email. Someone worked on this amp and they did somthing to fix the problem but did not work. Im not sure if he did this but. I Looked at the schematics on there site and they are 2 2n4125 But in mine there is one of the 2n4125 and there is a 2n5227 could that be a Problem. |
bruce
| | Posted on Monday, December 30, 2002 - 4:29 am: |
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307 youve had too much eggnog HE HE HE the 2907 and 2222 are widely used and depenable transistors my question was how come they would be failing unless it was a design flaw. Otherwise i thought it sounded like pitted relay contacts
Bruce |
ss8541
| | Posted on Wednesday, January 01, 2003 - 2:04 am: |
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this is a known problem with -all- amps of this type. there is no protection circuit in these amps to protect the pre-amp trans so a strong signal from a nearby txer will take them out. hooking the coax up backwards can sometimes take the pre-amp out also if the pre-amp is on when radio is keyed(while coax is connected backwards). |
307
| | Posted on Wednesday, January 01, 2003 - 6:53 pm: |
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They can have a diode juction shorted or open and be good from E-B , C-B , but E-C is shorted...Very common in Texas Star amps...Back to the Egg Nog...Hick-up
307 |
cobra
| | Posted on Wednesday, January 01, 2003 - 7:58 pm: |
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ss8541
307 said to put in 2n4401 transistors. I did so but I am not sure if I put then in the legs right. I just matched up the way the transistor looked on the board. The amp keys OK but the receive is low. Are these the protection transistors?
THANKS |
307
| | Posted on Thursday, January 02, 2003 - 7:01 am: |
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No , They are not protection transistors. sounds like you solved the "key" problem , when you turn on the RX amp , do you see "more S units" on the meter, just not what you think you should see? The new Texas Star amps use 2N4401's. It should work
307 |
Cobra
| | Posted on Thursday, January 02, 2003 - 5:46 pm: |
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The Key Worked. The Amp Gets out great. It Does What its supposed to in wattage .. the problem is when i touch the ssb light to turn on the meter light the Receive goes almost dead and when i turn off the amp the receive comes back on. |
307
| | Posted on Thursday, January 02, 2003 - 6:40 pm: |
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"touch the ssb light to turn on the meter light" I am confused here...What are you trying to say?
307 |
cobra
| | Posted on Thursday, January 02, 2003 - 6:52 pm: |
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I know its strange to get the amp too key i have to push the ssb botton In And Out in then it will be on.. |
Cobra
| | Posted on Saturday, January 04, 2003 - 2:05 am: |
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307 what should i do with this amp? |
307
| | Posted on Saturday, January 04, 2003 - 8:39 am: |
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I have seen it before where a "button" set of contacts was not making and it caused the same problem you described...The answer ? Get it fixed... I can do it for you if you email me at tech307@copperelectronics.com
307 |
