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Message |
    
Bigbob
Senior Member
Username: Bigbob
Post Number: 2172
Registered: 12-2001
| | Posted on Monday, September 05, 2005 - 10:58 am: | 
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Considering cutting trace on both sides of center leg of amc shunt switch,bridging the 2 sides with a jumper.Removing wires from front rf power control and taping off,then attach shielded audio cable from pot to center leg of switch and jumper,the pot is 5k ohms.Have to use a jumper on pcb because one side has 2 resitors one to r.beep,one to fm circuits,the other side goes to mike cicuits,the collector of switch is right in the middle.Wanted to try a variable resistance first,unless you have a better idea besides throwing my radio in the trash masher.Bigbob |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2177
Registered: 12-2001
| | Posted on Monday, September 05, 2005 - 1:01 pm: |
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I took the cover off my radio(oh heavens)and found all the controls turned all the way up amc,alc,ssb power,carrier power.My radio was peaking 38 watts,then 23 just recently on ssb,took cover off and discovered the controls in their respective positions,got alignment instructions from cb tricks and reset ssb power to 13 volts and am carrier to 10 watts,shut radio off then turned back on,now it peaks 38 watts on ssb again,I hope no semi-condutors were permanantly dammaged.Bigbob |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2181
Registered: 12-2001
| | Posted on Monday, September 05, 2005 - 7:01 pm: |
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OH PAT,OH PAT,really I heard you say to one guy on here to put a 1500 ohm resistor on the center leg of the amc shunt,how about on the base pin instead,what was your experience with this mod,really I want to know.And I stand corrected the S-9 is not overated,after what I read and saw on the internet,I did not know so much stuff could be crammed into such a little box without feed back squeal,HEY and I want a heat sink on my driver and finals too.Man swinging to 40 watts is just 2 watts shy of saturation,my radio just swings to 38 and thats on ssb,I can get 38 on am 1% of the time,this considering 60 is the saturation point of 2 2312c's.I WANT 60,I WANT 60,DARN OLD GALAXY j/k,40 all the time would be a nice average though.Bigbob |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2183
Registered: 12-2001
| | Posted on Monday, September 05, 2005 - 7:20 pm: |
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I guess I should have got an s-9 |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1409
Registered: 7-2004
| | Posted on Monday, September 05, 2005 - 9:00 pm: |
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Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 572
Registered: 9-2004
| | Posted on Monday, September 05, 2005 - 11:59 pm: |
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if you're asking pat for his opinion on how to mod a galaxy, watch out! you might not like his answer! LOL
matt |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2184
Registered: 12-2001
| | Posted on Tuesday, September 06, 2005 - 6:04 am: |
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Well,I discovered the problem,dummy me,bad jumper I got at a yard sale,tugged on both ends and one end popped off.It was soldered but solder was not on conductors,ripped it to pieces and threw it away,hands still hurt.Did the mod with 1000 ohm resistor,did not like performance,the jumper must have affected finals or something,my watt meter shows a peak of 29 most of the time,BUT,the amp still puts out 530,maybe I miss read the darn thing a while back,I put the cover back on and left well enough alone.Yeah Kid V. all of pats mods for galaxies involve a bag of quickcrete and a wire loop.I just wanted an answer to the first post,but I answered it myself,man I was sweating hard,my shaky hands and a soldering iron and needlenose pliers not a good combination for either side of pcb,lol.Bigbob |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 576
Registered: 9-2004
| | Posted on Tuesday, September 06, 2005 - 7:03 pm: |
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im glad you got my little joke. i like the part about the quickcrete. you know those new yorkers are pretty experienced at dropping cement to the bottom of a river. LOL
i have had more problems turn out to be a used piece of coax of unknown origin than i care to admit!
ever gone to rad shak at 7:45pm for a cheapo jumper because the one at home went kaput?
if i had; i'd never tell!
glad you got it fixed though.
matt |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1432
Registered: 7-2004
| | Posted on Friday, September 09, 2005 - 6:51 pm: |
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the resistor on the center leg of the transistor is to give a 'little' bit of breathing room for adjustment without flattopping as soon as you continue with other audio mods. if time allows, you can experiment with that resistors' value to get optimum audio 'loudness' at 100% peaks...1-1.5k is avg/what works most of the time. putting a variable THERE would probably create more problems then it's worth. spend the time to get it where it looks best(if using scope) or sounds best to the ear. variable is best left for audio gain & variable rf power output.
when doing 8719/8734 radios, i don't find that the radio that easily gets 20+ watts does ANY better then the 1 that does only 13 or 14. i am not using it barefoot, & amp swing is NOT affected by that little of a difference.
bad jumpers are the scourge of the CB world...
i guess you noticed all the concrete factories in staten island, NJ the NY metro area, huh?
got your e-mail, bigbob. nothing is the BEST at EVERYTHING, but...
S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9
magnum has got the right idea |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2194
Registered: 12-2001
| | Posted on Sunday, September 11, 2005 - 10:19 pm: |
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Ok,this is a suggestion for any radio type,I was thinking a diode reversed biased at the center leg of shunt would control the negative peaks but let positive peaks of more than 100% through,kind of like the negative peak clipping of the resistor-diode combo but at the shunt switch instead,what do you think,or has it been tried already?Bigbob |
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