Search found 27 matches

by SinStp
Monday 14th Jun 2010, 14:52
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 25ltd st
Replies: 2
Views: 1979

Re: Cobra 25ltd st

Thank you sir , thats what I'll do. Thanks for the response.
by SinStp
Thursday 20th May 2010, 15:01
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 25ltd st
Replies: 2
Views: 1979

Cobra 25ltd st

Curious if anyone knows what L20 adjusts or could tell me where to find what it adjusts on Cobra 25 LTD soundtracker , manufactured in may 97. Its the tuning can right next to pa/ext speaker jacks. Long story short i left it open and my very helpful son turned it all they way in. Recieves and transm...
by SinStp
Sunday 18th Jan 2009, 14:18
Forum: CB Radio General
Topic: Anyone used/got a Superstar dm-452 mic?
Replies: 5
Views: 4427

Anyone used/got a Superstar dm-452 mic?

I've got one and all it will do is squel. Ive tried it on several radios , adjusted every imaginable way and even did a cap and resistor mod to the audio line to stop rf feedback . Echo sounds great but when you turn it up enough to modulate it squels horrible. I bought it new about 2 months ago. Iv...
by SinStp
Saturday 17th Jan 2009, 13:33
Forum: CB Radio Modifications
Topic: Cobra 134 / 138 channel expansion
Replies: 2
Views: 2461

Cobra 134 / 138 channel expansion

thank you sir.
by SinStp
Friday 16th Jan 2009, 17:12
Forum: CB Radio Modifications
Topic: Cobra 134 / 138 channel expansion
Replies: 2
Views: 2461

Cobra 134 / 138 channel expansion

Hello Ive got and old sideband cobra 134 (says 138a on back) thats 23 channels. Is it possible to add more channels to it. Would i just swap the crystals for the ones i want to add ? Its board has pc003aa on it. Thanks , Mike
by SinStp
Saturday 10th Jan 2009, 14:26
Forum: CB Radio Modifications
Topic: more helpful info?
Replies: 7
Views: 3784

more helpful info?

I dont know if the 1969 will work in the cobra dx , If you turn up the modulation pot and make sure you have good swr's , your do about all that radio is capable of. Not sure if an atv has enough ground plane for you to get you swr low enough. Possibly cophasing two antenna's will work better as the...
by SinStp
Friday 9th Jan 2009, 13:50
Forum: CB Radio Modifications
Topic: more helpful info?
Replies: 7
Views: 3784

more helpful info?

Im not an expert but Ill try to help the final is in the left rear corner of radio. It will be bolted to the frame of the radio. It should say c2078 on it or just 2078 on it . The driver looks like the final but im not sure what number will be on it but will be fairly close to final . Just make sure...
by SinStp
Wednesday 7th Jan 2009, 16:08
Forum: CB Radio Modifications
Topic: Disable Sountracker on Cobra 25
Replies: 0
Views: 1364

Disable Sountracker on Cobra 25

Was wondering if it possible to disable sountracker on transmit only as it has a terrible squeal on transmit with soundtracker on. Sounds fine with sountracker off. It was manufactured in 97. Was not sure if i needed the pcb # or not. Will get it if it makes a difference
by SinStp
Tuesday 9th Dec 2008, 15:20
Forum: CB Radio Repair and Troubleshooting
Topic: Power Mic Problems
Replies: 8
Views: 6491

Power Mic Problems

Ive seen that sometimes the squeel is from rf feedback. I do not have talkback on either radio. I tried the defpom resolution for feedback under radio mods. Which was a 1k resistor and two caps. Still does the same thing. Is there something else i can try for rf feedback or could it be something els...
by SinStp
Saturday 29th Nov 2008, 17:56
Forum: CB Radio Repair and Troubleshooting
Topic: Power Mic Problems
Replies: 8
Views: 6491

Power Mic Problems

Ive got a question about power mics and echo mics. I just got a superstar dm-452 and ive tried it on a couple of my old cobras and all it does is squel. I turned the pots in the mic down to the point where the radios have no swing then the squel goes away. But the radio sound like %#$%. I have the d...
by SinStp
Wednesday 8th Oct 2008, 12:51
Forum: CB Radio Modifications
Topic: is this correct for cobra 29 ltd lassic mosfet mod?
Replies: 7
Views: 16768

Step one is refering to replacing the final as in the final transistor. Here is a link to instructions for replacing the final .

http://www.cbtricks.com/miscellaneous/f ... 29_mod.jpg
by SinStp
Monday 22nd Sep 2008, 8:42
Forum: CB Radio Amplifiers
Topic: Page 75 by Electronics Unilimited info
Replies: 5
Views: 3984

thanks again , one more question. Would a cobra 29 with the mosfet upgrade be okay to run with an amp. It deadkeys around 2 to 3 and swings around 40, or would the amp make that much of a difference ?
by SinStp
Monday 22nd Sep 2008, 2:55
Forum: CB Radio Amplifiers
Topic: Page 75 by Electronics Unilimited info
Replies: 5
Views: 3984

Thanks timrim , is the dead key all that matters. Does it matter how much the radio will swing. Does it hurt to lower dead key by tuning slugs or will i nned a swing kit. Thanks
by SinStp
Sunday 21st Sep 2008, 13:18
Forum: CB Radio Amplifiers
Topic: Page 75 by Electronics Unilimited info
Replies: 5
Views: 3984

Page 75 by Electronics Unilimited info

I just picked an amp today and I cant find any info on it. Its a Page 75 by Electronics Unlimited. Its works fine and puts out around 80 watts on my meter but i was curious if anybody knew what the max input would be for this amp. I dont want to overdrive it and blow it up. It looks to be pretty old...
by SinStp
Thursday 18th Sep 2008, 14:09
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 20486

Correction , I didnt blow up my radio. It nows swings low 40's , thanks to timrimm , and I appreciate the hell out of guys like timrim and ramblingman helping me out and a big part of this hobby is tinkering around with these radios. I would rather blow up a $75.00 radio tweaking it and having fun w...
by SinStp
Sunday 7th Sep 2008, 12:26
Forum: CB Radio Repair and Troubleshooting
Topic: Blowing Fuses
Replies: 8
Views: 3895

Thank you sir, your help is appreciated.
by SinStp
Sunday 7th Sep 2008, 8:06
Forum: CB Radio Repair and Troubleshooting
Topic: Blowing Fuses
Replies: 8
Views: 3895

Thats what i was afraid of, It still deadkeys 4 and swings around 7 or 8 on my meter when i hook it up the way the instructions show and re move the pot so I guess i havent damaged any thing. What is all the talk about the setting bias voltage for. Are some guys not installing the en1230 ? Any way t...
by SinStp
Sunday 7th Sep 2008, 3:41
Forum: CB Radio Repair and Troubleshooting
Topic: Blowing Fuses
Replies: 8
Views: 3895

Ok i put 5 amp fuse in and it doesnt blow fuse when pot is turned up high but has almost no output, when i turn up pot the out put comes up still less than a watt but sounds like a cap or something is whining pretty loud and when i turn it up more the 5 amp fuse blows. should i just put the stock pa...
by SinStp
Saturday 6th Sep 2008, 15:55
Forum: CB Radio Repair and Troubleshooting
Topic: Blowing Fuses
Replies: 8
Views: 3895

Its blowing 2 amp fuses. Thats what was in it when i got it. Does this mod require higher amperage fuses ? Thanks for your help , Mike
by SinStp
Friday 5th Sep 2008, 16:36
Forum: CB Radio Repair and Troubleshooting
Topic: Blowing Fuses
Replies: 8
Views: 3895

Blowing Fuses

I just installed ekl2030 in my new cobra 29 ltd and when i hook up a 10k pot to set bias voltage it blows fuses as soon as i key up. Hooked to +c116 and gate of 2030, ive tried turning resistance both ways, still blows fuses. works fine when i unhook the pot. keys 4 watt and swings around 8 on my ol...
by SinStp
Thursday 4th Sep 2008, 17:09
Forum: CB Radio Modifications
Topic: ekl mod , setting bias voltage
Replies: 1
Views: 1933

ekl mod , setting bias voltage

I just installed the ekl 2030 mod to my new 29 ltd and it has low output. approx 3 watts dead key , 8 swinging. Ive seen where the bias voltage needs to be set to raise output. Ive got around 1.5 volts to the far left leg of the 2030. I decided to put a 10k pot from pos side of c117 as described in ...
by SinStp
Saturday 23rd Aug 2008, 12:31
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 20486

Yes , the mosfet upgrade. just looks like a lot of guys have had problems. Im sure it has alot to do with the quality of the parts and the installer. Is any body running a fan to help with the extra heat ? Or is there not enough to worry about
by SinStp
Saturday 23rd Aug 2008, 12:28
Forum: CB Radio Modifications
Topic: Midland power mods
Replies: 3
Views: 3926

I'll try that . thanks
by SinStp
Friday 22nd Aug 2008, 17:40
Forum: CB Radio Modifications
Topic: Midland power mods
Replies: 3
Views: 3926

Midland power mods

Does anyone know if you can replace the finals in older radios and get the power gains the cobra 29's are supposed to be getting. I ve got a few old 77-882 , 13-882c , 13-857 and would like to make loud. Would the 1969 be better for these older ones or will it even work
by SinStp
Friday 22nd Aug 2008, 17:36
Forum: CB Radio Modifications
Topic: How many have done cobra final upgrade here , does it work
Replies: 24
Views: 20486

How many have done cobra final upgrade here , does it work

Just curious if it is woth it. Loks like alot of guys have had problems. Mine is new, couple months old anyway. Would rather not mess it up

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