Search found 165 matches

by speedracer6g
Wednesday 28th May 2008, 13:50
Forum: CB Radio Modifications
Topic: galaxy dx 88hml dual mosfet upgrade help???
Replies: 21
Views: 29541

galaxy dx 88hml dual mosfet upgrade help???

Well this is an interesting one. I have a galaxy dx 33hp and this other galaxy 88hml. both with the 3600 series boards. i went through the dx 88hml and updated everyting in it to match the 33hp's mosfet setup. in the end the am regulator gets pretty warm and it only puts out 18 watts. verses 17 with...
by speedracer6g
Wednesday 21st May 2008, 6:32
Forum: CB Radio Modifications
Topic: Need Galaxy dx 949 dual mosfet upgrade not ekl version.
Replies: 3
Views: 6998

thanks anyway i got the skinny from the galaxy tech at wwdx forum heres the schematics he sent me. i am just going to use this to make up my own mod. thanks.

http://www.cbtricks.com/radios/galax.../dx959_sch.pdf

http://www.cbtricks.com/radios/galax...mosfet_sch.pdf

:wink:
by speedracer6g
Wednesday 21st May 2008, 1:20
Forum: CB Radio Modifications
Topic: Need Galaxy dx 949 dual mosfet upgrade not ekl version.
Replies: 3
Views: 6998

Need Galaxy dx 949 dual mosfet upgrade not ekl version.

I am trying to find the dual mosfet upgrade for the dx 949. I dont care much for the ekl version i never have any luck with them. Anybody have info on the new mosfet versions of this radio. any schematics would be greatly helpful.

MIKE
by speedracer6g
Wednesday 21st May 2008, 1:17
Forum: CB Radio Modifications
Topic: Galaxy 949
Replies: 3
Views: 6846

Watt readings vary by make and type of meter. Also that could of been 32 watts on a dosy or one like it and the 60 watts could of been from a bird 43p meter. dosy says its a peak meter but it realy isnt. I would trust the $600 bird wich is industry standard before i would trust anything else. on my ...
by speedracer6g
Tuesday 20th May 2008, 7:57
Forum: CB Radio Modifications
Topic: Galaxy 949 Peak
Replies: 13
Views: 16176

Not bashing anyone but i agree with the fact that cutting limiters is bad there is usually more than enough ajustment for more modulation especially on this radio. Cutting limiters will only show you false power readings and distort the radio grab a scope and look at it. I know that it looks like yo...
by speedracer6g
Monday 19th May 2008, 11:17
Forum: CB Radio Repair and Troubleshooting
Topic: No Swing on AM - Uniden PC244
Replies: 10
Views: 13562

just a thought did you check for any cold solder joints. Also check the am regulator. I would start by keying the radio and flex the board a little bit with you finger and see if you audio comes back intermittently. I would have to look at the schematic to be able to tell you much more. I will see i...
by speedracer6g
Monday 19th May 2008, 3:34
Forum: CB Radio Amplifiers
Topic: built in linears
Replies: 9
Views: 21667

I just purchased some of the pcn-60 and the 203 boards from rm italy for my radio shop. I did a trial install on one of my spare cobra 29ltd's. And like some one said rf shielding is badly needed to make them work properly along with about a 1 watt deadkey with some serious swing to get any power ou...
by speedracer6g
Saturday 17th May 2008, 6:36
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 142gtl /Tram D300/washington base talkback problem????
Replies: 7
Views: 9430

yep no problem got er done thanks agian

MIKE
by speedracer6g
Friday 16th May 2008, 22:53
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 142gtl /Tram D300/washington base talkback problem????
Replies: 7
Views: 9430

this radio has no internal speaker. But i did find out from looking at the schematic that you are right about the audio. they route the audio though the mic. this unit has low receive with no mic on it also. this led me to beleive there was a short to groung somewhere in the audio distribuiton. went...
by speedracer6g
Friday 16th May 2008, 5:37
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 142gtl /Tram D300/washington base talkback problem????
Replies: 7
Views: 9430

Well hopefully i can save someone alot of headaches. I traced the problem to the headphone jack. I didnt have the insulated washer and was somehow grounding enough to let some audio through the speaker at all times. so could be a bad cap in the mic jack. but i just put a nylon washer behind the jack...
by speedracer6g
Thursday 15th May 2008, 22:37
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 142gtl /Tram D300/washington base talkback problem????
Replies: 7
Views: 9430

It has the external speaker only. the problem seems to be audio is getting back in the speaker. looking at the schematic the mic should turn the rx audio off when you key up but somehow there must be a leaky cap or something to ground somewhere. it still has a low level rx without the mic hooked up....
by speedracer6g
Wednesday 14th May 2008, 6:12
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 142gtl /Tram D300/washington base talkback problem????
Replies: 7
Views: 9430

Cobra 142gtl /Tram D300/washington base talkback problem????

Working on this tram d300 solid state radio same as the cobra 142 or washington base. it has talkback but it is not supposed to have talkback. cant find any resistor jumped to add talkback. replced a couple questionable caps in the audio section but i am still getting talkback. anyone ever had this ...
by speedracer6g
Tuesday 13th May 2008, 12:39
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 29ltd Poor Receive
Replies: 5
Views: 8065

Well i have found the problem. someoe thought he would put a 390ohm resistor in line with the rf gain pot. for some reason i missed that, it was hidden in the bundle of wires. Dont know what they were thinking but anyway after all that messing around that is all it was. thanks for all the help rick....
by speedracer6g
Tuesday 13th May 2008, 9:18
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 29ltd Poor Receive
Replies: 5
Views: 8065

ok I checked and replaced both r48 and c20. Both were ok but i replaced them anyway. checked ops and no luck. checked the 1st mixer frequency and it is 16.714 on CH40 and 16.270 on CH1. I checked fet1 and it is ok. I also replced c11 and checked c9. I noticed something interesting though when i jump...
by speedracer6g
Monday 12th May 2008, 5:49
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 29ltd Poor Receive
Replies: 5
Views: 8065

Thanks Rick your a big help I will check them later. I did finally check my fet and it is fine so i will look at the other issues you told me about.

thanks,

Mike
by speedracer6g
Sunday 11th May 2008, 4:48
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 29ltd Poor Receive
Replies: 5
Views: 8065

Cobra 29ltd Poor Receive

I am working on a cobra 29 ltd. Checked the radios receive and found that the audio dosnt clean up until around 7-8 uV on the service monitor. Tx is fine. I checked R31 and it was fine I replaced anyway for PM. I replaced D1, D2, D4, D5, D6 and Tr7. Still no luck. I noticed when running through the ...
by speedracer6g
Wednesday 7th May 2008, 12:07
Forum: CB Radio Modifications
Topic: Mod for Higher Dead Key With Cobra After ERF 2030 mod
Replies: 5
Views: 10796

Sure can!! -instead of using a 4.7k use a 10k pot or 100k. set your gate voltage to about 2.7 to 3volts. Do this by putting a voltmeter on left most leg of the mosfet final when looking at the face of the transistor. -remove C45 -remove C46 and install a 480pf capacitor. Also do not put a jumper on ...
by speedracer6g
Saturday 12th Apr 2008, 12:30
Forum: CB Radio Repair and Troubleshooting
Topic: texas Ranger tr-127fs no tx or tx
Replies: 3
Views: 5736

I have power on the pll and at the power switch. i loose power at the pll chip when i key the radio. i removed the audio chip and it still drops power as soon as i key the radio even with tr 24 removed. would a bad pll chip like ic2 cause this problem????

Mike
by speedracer6g
Friday 11th Apr 2008, 23:59
Forum: CB Radio Repair and Troubleshooting
Topic: texas Ranger tr-127fs no tx or tx
Replies: 3
Views: 5736

texas Ranger tr-127fs no tx or tx

I am working on a texas ranger tr-127fs radio the face lights up and the channel display lights up as soon as i key the radio the led display goes out. it does this on cb and pa i checked b+ at the pll and it drops to zero when you key the radio rx also does not work. no audio on pa either. tried to...
by speedracer6g
Friday 28th Mar 2008, 13:55
Forum: CB Radio Repair and Troubleshooting
Topic: Galaxy DX-77HML Overmodualted help
Replies: 1
Views: 3636

well i am going to answer my own question here. Just found the problem i found that D70 was cut and it was hiding under the wiring by the echo board. well maybe this will help someone else who is trying to fix up someone elses snip and clip job.

MIke :D
by speedracer6g
Friday 28th Mar 2008, 13:11
Forum: CB Radio Repair and Troubleshooting
Topic: Galaxy DX-77HML Overmodualted help
Replies: 1
Views: 3636

Galaxy DX-77HML Overmodualted help

I have a galaxy dx-77hml that is overmodulated and flat topping on the scope. I fixed tr-53 and the tr32 and removed the swing kit. i looked until i was crosseyed and i cant find anything else that was hacked up. i checked a couple transistors in the amc circuit and they all check ok. the modulation...
by speedracer6g
Monday 24th Mar 2008, 11:21
Forum: CB Radio Repair and Troubleshooting
Topic: browning mrk iva off freq.
Replies: 2
Views: 5472

Are all the channels off or is it just one?
by speedracer6g
Saturday 15th Mar 2008, 14:39
Forum: CB Radio Repair and Troubleshooting
Topic: MAGNUM 257 ROADPRO TITAN 2 NO TX OR RX
Replies: 6
Views: 8826

yep i just signed up i wont get full access for a while i guess.

MIke :?:
by speedracer6g
Saturday 15th Mar 2008, 13:14
Forum: CB Radio Repair and Troubleshooting
Topic: MAGNUM 257 ROADPRO TITAN 2 NO TX OR RX
Replies: 6
Views: 8826

thanks for the schematic it wont let me download it so i will have to try and set up an account. i got it figured out now it was in programing mode or something it is actually a 10 meter rig havent worked on one before. I now need a mic pinout diagram. I have deadkey but no modulation and i think th...
by speedracer6g
Saturday 15th Mar 2008, 9:21
Forum: CB Radio Repair and Troubleshooting
Topic: MAGNUM 257 ROADPRO TITAN 2 NO TX OR RX
Replies: 6
Views: 8826

MAGNUM 257 ROADPRO TITAN 2 NO TX OR RX

Have a roadpro titan 2 no tx or rx when i key up i get an EE on the lcd display. i dont have a serivice manual so i am kind of stuck. i am not sure if it is supposed to have a EE on tx or if it is an error code i am thinking it is an error code. any help would be great. If anyone knows where i can g...
by speedracer6g
Wednesday 12th Mar 2008, 23:04
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 29 EKL 2030 problem
Replies: 6
Views: 8417

what was your bias voltage or on the ekl2030 if you dont see between 2.7 - 3.0 volts you wont see much if any improvement on this mod. you will want to get a 10k pot and set the bias voltage first then you will see better results. i have more info on this mod for the 29 and 25 cobra i spent about tw...
by speedracer6g
Wednesday 5th Mar 2008, 12:38
Forum: Wanted !
Topic: uniden pro-640e manual
Replies: 3
Views: 7557

tried uniden and they dont support that model anymore. I was just having problems with the led meter display it dosnt show power or signal strength. didnt find anything on the net yet either.

MIKE
by speedracer6g
Wednesday 5th Mar 2008, 9:45
Forum: CB Radio Modifications
Topic: Cobra 29LTD CLASSIC with ERF- 2030 after modification
Replies: 20
Views: 37158

actually i am using a erf2030 sorry about the confusion. i did remove the slug from L14. I set the bias voltage to 2.8v i think ,every thing has been working fine for the last couple days and i talk on it everyday unit is running cooler and hasnt blown yet. i will let you know if it does. MIKE :D ps...
by speedracer6g
Monday 3rd Mar 2008, 15:04
Forum: Tech Area
Topic: tube tester ????
Replies: 1
Views: 6523

tube tester ????

wondering what is the best tube tester to get or most poplular for working on radio equipment. want ot make an investment for my shop and dont want to waist my money on one that wont do the job.

Thx,

Mike :?:
by speedracer6g
Monday 3rd Mar 2008, 9:00
Forum: CB Radio Amplifiers
Topic: Palomar skipper ??? need skematic
Replies: 1
Views: 4625

sould read before i ask.

figured out the problem. was a broken coax and well the fianals are only capable of about 100pep a peace wich is only about 70 watts so it is working fine.

thanks anyway,

:D
by speedracer6g
Monday 3rd Mar 2008, 8:57
Forum: Tech Area
Topic: Palomar skipper ??? problem and schematic
Replies: 1
Views: 6178

nevermind the help figured it out

I found there was a broken coax on the ouput side very small break hard to see. but i realized that the finals were working like they are supposed to and the amp is fine now.

thanks anyway. :sign3: i sould read the data sheets on things before i ask.

mike
by speedracer6g
Saturday 1st Mar 2008, 15:17
Forum: Tech Area
Topic: Palomar skipper ??? problem and schematic
Replies: 1
Views: 6178

Palomar skipper ??? problem and schematic

I had a guy drop off a palomar skipper the other day and i am getting intermitent power from this linear. first thing it had 2 2sc2879 finals in it and thats it and he said it was a 400 or 500 but when i look up those finals i am seeing 100 pep each. but anyway i am getting about 120 watts with the ...
by speedracer6g
Saturday 1st Mar 2008, 15:16
Forum: CB Radio Amplifiers
Topic: Palomar skipper ??? need skematic
Replies: 1
Views: 4625

Palomar skipper ??? need skematic

I had a guy drop off a palomar skipper the other day and i am getting intermitent power from this linear. first thing it had 2 2sc2879 finals in it and thats it and he said it was a 400 or 500 but when i look up those finals i am seeing 100 pep each. but anyway i am getting about 120 watts with the ...
by speedracer6g
Thursday 28th Feb 2008, 15:08
Forum: CB Radio Modifications
Topic: Cobra 29LTD CLASSIC with ERF- 2030 after modification
Replies: 20
Views: 37158

I set the bias votage to about 2.7 to 2.8 volts. I get about a 5 watt deadkey and 18 watts out on my motoroala service monitor. I hooked up the scope to check for overmod and everyting looks clean. no clipping.

MIKE :dance:
by speedracer6g
Thursday 28th Feb 2008, 13:39
Forum: CB Radio Modifications
Topic: Cobra 29LTD CLASSIC with ERF- 2030 after modification
Replies: 20
Views: 37158

Sorry about writing in all caps wast thinking but my gate voltage is about 3.2 i believe i will set it down to about 2.7 and see what happens. i see on the irf520 it is set to about 3.6volts and i was going by what was on there. but i guess the erf2030 is happy around 2.7v. I noticed that the fets t...
by speedracer6g
Thursday 28th Feb 2008, 10:44
Forum: CB Radio Modifications
Topic: Cobra 29LTD CLASSIC with ERF- 2030 after modification
Replies: 20
Views: 37158

I HAVE ABOUT 3.2 VOLTS. BUT I THINK IT IS SUPPOSED TO BE 3.6 OR SOMETHING. ISNT THERE A DIODE YOU CAN INSTALL TO HELP THIS MOSFET TO BE MORE STABLE I KEEP BLOWING MOSFETS AFTER A COUPLE OF HOURS OF USE.

MIKE :D
by speedracer6g
Tuesday 26th Feb 2008, 9:04
Forum: Wanted !
Topic: uniden pro-640e manual
Replies: 3
Views: 7557

uniden pro-640e manual

I need a manual for a uniden pro-640e can anyone help me out on this one.

thanks,

MIKE :?:
by speedracer6g
Monday 25th Feb 2008, 11:29
Forum: Tech Area
Topic: uniden pro640e
Replies: 3
Views: 9018

uniden pro640e

I am looking for a sevice manual for a uniden Pro 640e I cant seem to find one anywhere.

HELP!!

Thanks,

MIKED :?:
by speedracer6g
Saturday 23rd Feb 2008, 13:52
Forum: CB Radio Modifications
Topic: Cobra 29LTD CLASSIC with ERF- 2030 after modification
Replies: 20
Views: 37158

oh i no disrespect to anyone here i know i am a newbie to the site but the modulator mod is kind of crappy it only overmodulates the radio. i will have to take a picture of the scope with this mod it realy messes up the audio. it clipps the audio no matter how low you turn your modulation down.

:D
by speedracer6g
Saturday 23rd Feb 2008, 13:49
Forum: CB Radio Modifications
Topic: Cobra 29LTD CLASSIC with ERF- 2030 after modification
Replies: 20
Views: 37158

i did the same mod and there is a fix to get your deadkey up and mod power up. i got the cobra 25 to work pretty well i have it putting out about 19 watts clean with no distortion. but the 29 i have is around 17 watts yet i am still tweeking it. but so far this is what i did to get these results. st...