Search found 165 matches

by speedracer6g
Tuesday 24th Feb 2009, 9:50
Forum: CB Radio Repair and Troubleshooting
Topic: cobra 148 gtl no tx in am rx ok.
Replies: 2
Views: 2150

cobra 148 gtl no tx in am rx ok.

Radio Make and Model: cobra 148 gtl-d PCB Number: kepc-332-e6 PLL Number: 8719 Test gear available: scope, comm analyzer, ac/dc meter , freq gen/counter ect. Symptoms: No tx in am mode ,ssb ok in tx and receive. pa working in ssb mode but not in am mode. Rx works in am mode just no carrier or mod. W...
by speedracer6g
Saturday 27th Sep 2008, 13:32
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 22644

Ok then I am not worthy, I get it You have some years on me. Ha Ha :lol: Then that leaves me wondering a little then what is gm? I know for bipolar transistors it displays Hfe gain. What is gm on my meter I was under the impression that the was the gian of the mosfet. You will have to excuse me i am...
by speedracer6g
Saturday 27th Sep 2008, 0:51
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 22644

:roll: Well I dont know what to say to that I got the equipment here to do it and that is that. Non only do the numbers on my B&k model 530 transistor tester not lie my results dont lie either. I may not be Rick Jackson but I do have more knowledge than your average guy. I have 15 years of experienc...
by speedracer6g
Tuesday 23rd Sep 2008, 23:58
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 22644

In all sincerity i give the you respect dogem. I learned from the old rf techs that had been doing rf work for 30+ years like yourself and i am sure you can work on an old tram or golden eagle like nobodies business. I dont hate the 1969 finals i use them too. I agree alot of people out there want m...
by speedracer6g
Tuesday 23rd Sep 2008, 12:46
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 22644

The only reason i can see that cobra and uniden havent is due to the fact that they can afford to make the changes or that the cost is higher to go that route. I guess that cost probably the issue there. Ranger took advantage of the mosfets because there boards were actually realy easy to make the c...
by speedracer6g
Tuesday 23rd Sep 2008, 12:23
Forum: CB Radio Modifications
Topic: EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??
Replies: 7
Views: 4269

I have the kits that will work with the 11.3258 crystals so i think i will just lift the 10 pin of the pll and put in the 11.3258 crystal and use that kit. I checked my suplier for the crystals i need to do that mod and they dont have them so i will just change the crystal and mod the pll. thanks gu...
by speedracer6g
Monday 22nd Sep 2008, 9:01
Forum: CB Radio Modifications
Topic: EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??
Replies: 7
Views: 4269

Sorry got the wrong one it is an 11.1125 crystal. I know that the 11.325 crystal is .150 up and down from 11.325. Is it the same for 11.1125.

MIKE
by speedracer6g
Sunday 21st Sep 2008, 11:57
Forum: CB Radio Modifications
Topic: EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??
Replies: 7
Views: 4269

its a 142gtl radio. the mixer crystal is 10.24mhz and the pll is a mb8719.

thanks

MIKE
by speedracer6g
Sunday 21st Sep 2008, 8:14
Forum: CB Radio Modifications
Topic: EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??
Replies: 7
Views: 4269

EXPO B KIT WHAT CRYSTALS ARE IN THE KIT??

I am building a b kit and need the crystall information for that model. I dont have one here in the shop to compare it to. Any information would be appreciated. I already looked at cbtricks too.

Mike
by speedracer6g
Sunday 21st Sep 2008, 8:11
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 22644

Hi guys thought i would chime in on this discussion. heres my 5 cents worth of information. Bipolars have a lower gain than mosfets that is not new news to anybody. That is a plus compaired to bipolars. I will use either one but my favorite is the mosfet because you do get more power out of it compa...
by speedracer6g
Sunday 21st Sep 2008, 6:18
Forum: CB Radio Repair and Troubleshooting
Topic: cobra 148gtl no rx audio
Replies: 6
Views: 3485

SWEEEET :D

thanks Scott for the tip I will have to put that one in my notes. It was c186 by the audio chip. Must of been shorted out I replaced it and it is all good now.

thanks again,

MIKE :dance:
by speedracer6g
Sunday 21st Sep 2008, 4:24
Forum: CB Radio Repair and Troubleshooting
Topic: cobra 148gtl no rx audio
Replies: 6
Views: 3485

I Injected audio befor the pot and everyting works from the point. It seems like the audio is muted or squelced up but cant find where thing are fudged up. transmit works fine. when i put rf into the radio via my service monitor with 1kz tone i get receive on the meter but no sound. I will check the...
by speedracer6g
Saturday 20th Sep 2008, 8:47
Forum: CB Radio Amplifiers
Topic: k-line k100 onboard amplifier boards who has them????
Replies: 7
Views: 6237

TO santafe308 EMAIL ME AT mike@dibertselectronix.com
by speedracer6g
Saturday 20th Sep 2008, 1:11
Forum: CB Radio Repair and Troubleshooting
Topic: cobra 148gtl no rx audio
Replies: 6
Views: 3485

I also checked tr43 and there is 0v on all legs on tx and rx. Also the pcb # is PC-412
by speedracer6g
Saturday 20th Sep 2008, 1:08
Forum: CB Radio Repair and Troubleshooting
Topic: cobra 148gtl no rx audio
Replies: 6
Views: 3485

cobra 148gtl no rx audio

This radio has transmitt and no rx. the needle moves with rx but no audio. I checked the audio chip and it is fine I injected a signal into it and i have audio on the speaker. I checked tr13 and tr12 and the voltages are as follows. TR12 B 0V, C 8.19V, E .72 TR13 B 8.24, C .66, E 8.24 I also checked...
by speedracer6g
Saturday 20th Sep 2008, 0:15
Forum: CB Radio Repair and Troubleshooting
Topic: My gripe.
Replies: 13
Views: 10282

If i ever forgot to thank you Rick I am sorry. Thanks for all your help. It is nice to have a go to guy that has alot of experience. thanks again for all your help. Keep up the good work.

MIKE :D :D :wink:
by speedracer6g
Friday 19th Sep 2008, 9:27
Forum: CB Radio Amplifiers
Topic: k-line k100 onboard amplifier boards who has them????
Replies: 7
Views: 6237

I found out the company i work for has them we just dont have them in stock yet. We are currently getting rid of our rm itally boards first then we are going to those k100 units. I am sure we can get you one if you need them pm me for more info.

MIKE
by speedracer6g
Friday 19th Sep 2008, 8:00
Forum: CB Radio Amplifiers
Topic: k-line k100 onboard amplifier boards who has them????
Replies: 7
Views: 6237

Sorry, nevermind me i found out what i needed to know thanks.

MIKE :D
by speedracer6g
Friday 19th Sep 2008, 6:54
Forum: CB Radio Amplifiers
Topic: k-line k100 onboard amplifier boards who has them????
Replies: 7
Views: 6237

k-line k100 onboard amplifier boards who has them????

I was looking at new products on cbtricks.com and there is a nice kit for an onboard amp. Does anyone know where to get them?? here is the link to look at the setup.

http://www.cbtricks.com/Amp/k_line/k100/index.htm
by speedracer6g
Friday 19th Sep 2008, 5:03
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 25 ltd classic noise blanker problem.
Replies: 6
Views: 4271

got it going rick thanks for the help. bad diode.

thanks,

MIKE
by speedracer6g
Saturday 13th Sep 2008, 8:52
Forum: CB Radio Repair and Troubleshooting
Topic: What pll chip is in the new Cobra 25ltd radios?????
Replies: 2
Views: 2060

thanks :D
by speedracer6g
Saturday 13th Sep 2008, 3:30
Forum: CB Radio Repair and Troubleshooting
Topic: What pll chip is in the new Cobra 25ltd radios?????
Replies: 2
Views: 2060

What pll chip is in the new Cobra 25ltd radios?????

I am ordering some plls from cobra but and wondering if anybody knows what pll chip it is. The part on the chip just says cobra 25ltd. But what is it? I am looking to save a few bucks by bypassing cobra. If anyone knows please fill me in.

MIKE :wink:
by speedracer6g
Wednesday 10th Sep 2008, 3:00
Forum: CB Radio Repair and Troubleshooting
Topic: galaxy DX-88hml low ssb power am ok.
Replies: 17
Views: 8573

Well i found the problem. I must of bought a bad batch of 2sb827 transistors. I went back to the 754 that was in it and it worked fine. So i installed a 827 that i knew was good and now everything is just fine. that is what i get for ordering from a guy in china. Lesson learned. I check the Hfe gain...
by speedracer6g
Tuesday 26th Aug 2008, 12:50
Forum: CB Radio Repair and Troubleshooting
Topic: galaxy DX-88hml low ssb power am ok.
Replies: 17
Views: 8573

where are the smoothing caps??
by speedracer6g
Tuesday 26th Aug 2008, 12:43
Forum: CB Radio Repair and Troubleshooting
Topic: galaxy DX-88hml low ssb power am ok.
Replies: 17
Views: 8573

ok here goes.

TR49 B 7.5 C 11.5 E 7.35
TR50 B 11.5 C 7.3 E 11.75
TR51 B 11.75 C 7.3 E 12.95
TR52 B 7.0 C 11.6 E 7.0
TR53 B .85 C 7.8 E 1.8
TR54 B 0.0 C .5 E 0.0

R243 46.6 OHM
R241 9.7K

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