| Author |
Message |
    
Sparkomatic
Intermediate Member
Username: Sparkomatic
Post Number: 359
Registered: 10-2002
| | Posted on Tuesday, August 23, 2005 - 10:57 am: | 
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I am handy with a soldering iron so if anyone has some power mods for this radio that would be greatly appreciated.
I know alot of mods for the Cobra 148 GTL including volting the final but this radio seems to be quite a bit different inside. |
Fusebreaker
Member
Username: Fusebreaker
Post Number: 96
Registered: 3-2004
| | Posted on Tuesday, August 23, 2005 - 2:35 pm: |
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I would be careful when volting the final. |
Sparkomatic
Intermediate Member
Username: Sparkomatic
Post Number: 360
Registered: 10-2002
| | Posted on Tuesday, August 23, 2005 - 7:41 pm: |
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Volting the final only changes the voltage to the final from 12.8-12.9 to 14 volts.
I was told that a Grant XL has the same PLL, audio circuits but the board looks way different. |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 522
Registered: 9-2004
| | Posted on Tuesday, August 23, 2005 - 8:13 pm: |
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sparkomatic, what PLL is in your grant?
the stock voltage on the final is 8 volts.
volting the final puts 13.8 volts to it.
if done right this will increase your peak audio output. if, however you set the deadkey too high, (above about 5 watts), you will really be stressing that final transistor.
if your grant has the MB8719 or MB8734 chip in it, then it is the same radio as the 148 or the 2000. |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1295
Registered: 7-2004
| | Posted on Wednesday, August 24, 2005 - 7:46 am: |
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2000/148/xl/lt/TR296/general sherman/radio shack & a couple others....EXACTLY the same board with a few MINOR changes, none of which alter the standard mod procedures...on the other hand the president grant (US legal) & later uniden version(prior to XL/LT versions) WAS different...the general grant is a 150 watt connex 4800dxl... |
Fusebreaker
Member
Username: Fusebreaker
Post Number: 99
Registered: 3-2004
| | Posted on Wednesday, August 24, 2005 - 3:15 pm: |
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Kid_vicious you are correct the voltage to the final is usaully 6 to 8 volts on this type of radio this is to keep the wattage down to 4 watts on AM,When you go to side band the voltage goes up to 12 to 13 volts. I did this to one of my 148`s and had the AM carrier to 8 watts and adjusted the modulation where it would not do over 16 watts max.I set the ssb power for 14 watts.But you are correct.
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Mojo
New member
Username: Mojo
Post Number: 2
Registered: 10-2007
| | Posted on Tuesday, October 23, 2007 - 4:22 pm: |
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So how do you volt a final in a grant xl? |
Johhn
Member
Username: Johhn
Post Number: 82
Registered: 8-2007
| | Posted on Tuesday, October 23, 2007 - 8:10 pm: |
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cut r-131 adjust vr-5 too 90% modulation. |
Mojo
New member
Username: Mojo
Post Number: 4
Registered: 10-2007
| | Posted on Wednesday, October 24, 2007 - 12:29 am: |
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Did that allready. Just didnt know that's what they called it. |
Radi0head
New member
Username: Radi0head
Post Number: 2
Registered: 5-2008
| | Posted on Wednesday, May 14, 2008 - 4:00 am: |
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Originally posted by Johhn "cut r-131 adjust vr-5 too 90% modulation"
Shouldn't that be VR-7? http://www.copperelectronics.com/modlist/view.php?mode=old |
Johhn
Intermediate Member
Username: Johhn
Post Number: 144
Registered: 8-2007
| | Posted on Thursday, May 22, 2008 - 8:26 pm: |
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Re; Modulation,Grant first run=858=PLL
VR-7..
Modulation,Grant second run=8719=PLL
VR-5.. |
Johhn
Intermediate Member
Username: Johhn
Post Number: 145
Registered: 8-2007
| | Posted on Thursday, May 22, 2008 - 8:30 pm: |
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If you look under Modulation in the mod list
All you will see is ,modulation unlock.
But no VR # listed.. |
