Search found 319 matches

by zodiac
Friday 19th Dec 2014, 11:41
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant no TX audio
Replies: 2
Views: 2303

Re: President Grant no TX audio

This may be a bit too late but IC6 the audio chip and TR39 do get hot.
What voltages are you getting on IC4 in TX and RX.
by zodiac
Tuesday 21st Jan 2014, 9:40
Forum: CB Radio Repair and Troubleshooting
Topic: ranger 2950dx ept695015z
Replies: 1
Views: 1857

Re: ranger 2950dx ept695015z

It sounds like the big regulator transistor bolted to the side of the chassis at the back right hand side has gone.
That's why you have no control of the FM power and no AM audio.
by zodiac
Sunday 21st Apr 2013, 10:13
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 29 LTD Classic Recive/Transmit problems
Replies: 7
Views: 10039

Re: Cobra 29 LTD Classic Recive/Transmit problems

If the Final has gone short circuit it will take the receive out as well in most cases.
Check to see what current is being drawn by the radio in RX, it should be next to nothing.
If it's more than about 1/4 of an Amp de-solder the final and see if the receive comes back to normal.
by zodiac
Wednesday 27th Mar 2013, 12:40
Forum: CB Radio Modifications
Topic: superstar 360 band switch info please
Replies: 2
Views: 2289

Re: superstar 360 band switch info please

Just put the Yellow wire from the SFT position on the board that was removed from the band switch, to the N position just above R174 where the Black wire is now, remove the Black wire that's at 0v. You will also have to extend the VCO to cover S.Low to S. High, if you haven't already done it. Dave, ...
by zodiac
Sunday 24th Mar 2013, 1:40
Forum: CB Radio Repair and Troubleshooting
Topic: Superstar 360 /Cobra 148 mk2 rf gain/power control
Replies: 1
Views: 2108

Re: Superstar 360 /Cobra 148 mk2 rf gain/power control

This should help you out with the wires and switches.
MK2 wires.png
(297.03 KiB) Downloaded 124 times
by zodiac
Sunday 24th Mar 2013, 1:32
Forum: CB Radio Modifications
Topic: Jacko mods for super super etc ta!
Replies: 1
Views: 1667

Re: Jacko mods for super super etc ta!

Hi Pete,
If you haven't sorted it yet all you need to do is change the 14.550Mhz crystal to a 15.900MHz.
By doing so you will move the radio up in frequency by three bands to 29.655MHz channel 40 the highest band.
by zodiac
Wednesday 13th Mar 2013, 11:15
Forum: CB Radio Repair and Troubleshooting
Topic: Magnum S9 no ssb receive final bias stuck on fm all ok
Replies: 2
Views: 2474

Re: Magnum S9 no ssb receive final bias stuck on fm all ok

Hi Jason and welcome to the forum.
That's a strange one you've got there, try de-soldering the finals to see if the amps drop and tell us what the finals are, Mosfets or 1969's.
If you have a shorted final it will kill the receive.
by zodiac
Wednesday 5th Dec 2012, 2:24
Forum: CB Radio Repair and Troubleshooting
Topic: Cb not receiving
Replies: 3
Views: 2997

Re: Cb not receiving

Charlie,
All I can tell you is, if the PA is working then the audio chip is good and not the fault.
by zodiac
Sunday 25th Nov 2012, 3:14
Forum: CB Radio Modifications
Topic: Cobra 19 Ultra iii
Replies: 4
Views: 10896

Re: Cobra 19 Ultra iii

Edward, I know what you mean about falling asleep. Lou Franklin does his best to explain in simple terms most of what you need to know for the beginner in his book, THE SCREWDRIVER'S EXPERT'S GUIDE. If you need a book to get started with that won't put you to sleep, there was a book from Radio Shack...
by zodiac
Friday 23rd Nov 2012, 12:12
Forum: CB Radio Repair and Troubleshooting
Topic: colt 510 no sound
Replies: 2
Views: 1861

Re: colt 510 no sound

Just fit it Jon, it'll work fine.
You could tune the crystal for high band to get down to the UK band but you won't get all the channels.
Channel 33 will be 19 UK up to 40 for channel 26 UK.
Dave.
by zodiac
Monday 16th Apr 2012, 12:14
Forum: CB Radio Modifications
Topic: President Grant,Clarifier slide
Replies: 7
Views: 4526

Re: President Grant,Clarifier slide

I now use PIC's instead of an Eprom for that mod, it only needs a 2 pole switch instead of 4 poles with the Eprom. I've got two Jumbos I'm doing at present with MK2 Cobra 148GTL DX radios being fitted with the 3900 counters and zero switching using a PIC. Did one the same last year with a 3900 in an...
by zodiac
Monday 16th Apr 2012, 5:22
Forum: CB Radio Modifications
Topic: President Grant,Clarifier slide
Replies: 7
Views: 4526

Re: President Grant,Clarifier slide

Do you want to lend one of my hammers :lol:
by zodiac
Saturday 14th Apr 2012, 13:12
Forum: CB Radio Modifications
Topic: President Grant,Clarifier slide
Replies: 7
Views: 4526

Re: President Grant,Clarifier slide

Animal,
You forgot to mention the two varactor diodes D40 and D44 that need changing to ITT410 or same as.
You may find that a 4.7uh coil will do the same job as a 5.6uh.
by zodiac
Monday 16th Jan 2012, 5:23
Forum: CB Radio General
Topic: which mic. is the best...
Replies: 6
Views: 5314

Re: which mic. is the best...

Forget the standard mike, use the lollipop.
by zodiac
Saturday 24th Sep 2011, 11:06
Forum: CB Radio Modifications
Topic: Tristar 777 Nato Beep ?
Replies: 4
Views: 3975

Re: Tristar 777 Nato Beep ?

Well we learn something new every day, and you've explained it so well.
Thank you.
by zodiac
Friday 23rd Sep 2011, 12:03
Forum: CB Radio Modifications
Topic: Tristar 777 Nato Beep ?
Replies: 4
Views: 3975

Re: Tristar 777 Nato Beep ?

The 777 doesn't have a beep fitted as standard like the Nato, you'll have to fit one.
by zodiac
Tuesday 13th Sep 2011, 4:27
Forum: CB Radio Modifications
Topic: SS-3900, SuperStar 3900
Replies: 10
Views: 8460

Re: SS-3900, SuperStar 3900

3900's with plugs and socket at the front of the radio are all marked, +8v, RB (roger beep), +10k etc. where all the pins connect to on the board right at the side of the sockets. So if your radio has not been wired for the function you required just look at a schematic for the 3900 that has those f...
by zodiac
Monday 12th Sep 2011, 11:51
Forum: CB Radio Modifications
Topic: SS-3900, SuperStar 3900
Replies: 10
Views: 8460

Re: SS-3900, SuperStar 3900

As I said the orange wire on the left is for switching the beep on and off. If you hard wire the channel 9 switch for 1 to 40 you can then use that switch for switching the beep or for the +10kc, the +10kc when wired to a switch will take you up by one channel making it possible to get to the five a...
by zodiac
Sunday 11th Sep 2011, 2:12
Forum: CB Radio Modifications
Topic: SS-3900, SuperStar 3900
Replies: 10
Views: 8460

Re: SS-3900, SuperStar 3900

I think the orange cut wire on the left is the beep wire, just put it to a switch so you can switch it on or off. The other wire at the channel switch is like that in all the 3900's, that's normal. Yes they are trim pots (adjustable VR's) but leave them alone till you've got it going then see if the...
by zodiac
Saturday 10th Sep 2011, 5:22
Forum: CB Radio Modifications
Topic: SS-3900, SuperStar 3900
Replies: 10
Views: 8460

Re: SS-3900, SuperStar 3900

It looks like it's one of the later radios but before the crap Ranger ones, because it's got the frequency counter socket on the back of the radio for a counter. Does the SWR/CAL switch pull out to open the radio up to all bands and with it in you only get Mid band 26.965 to 27.405. The ALC looks to...
by zodiac
Monday 5th Sep 2011, 13:39
Forum: CB Radio Repair and Troubleshooting
Topic: Pres. jackson 2sc2166 self distruction
Replies: 15
Views: 7316

Re: Pres. jackson 2sc2166 self distruction

Alex, It's no good banging your head on the wall, you should be hitting the radio with a bigger hammer LOL. You say it only lasts about 30 seconds before it blows again but in what mode are you testing it in. I would have thought with only 10mA at the driver it shouldn't have done any damage at all....
by zodiac
Monday 5th Sep 2011, 4:29
Forum: CB Radio Repair and Troubleshooting
Topic: Pres. jackson 2sc2166 self distruction
Replies: 15
Views: 7316

Re: Pres. jackson 2sc2166 self distruction

It sounds like there is a short from the collector to the chassis of the 2166.
Make sure there is no connection between the two, do a continuity test from the tab of the driver to the chassis just to eliminate that possibility.
by zodiac
Sunday 4th Sep 2011, 11:42
Forum: CB Radio Repair and Troubleshooting
Topic: Pres. jackson 2sc2166 self distruction
Replies: 15
Views: 7316

Re: Pres. jackson 2sc2166 self distruction

Alex,
You only check the voltage at the base of the driver and the final one then the other, with the black probe of your meter to the PSU's negative connection.
With a dead key in side band mode there should be no more than 0.7v.
by zodiac
Thursday 1st Sep 2011, 11:43
Forum: CB Radio Repair and Troubleshooting
Topic: Pres. jackson 2sc2166 self distruction
Replies: 15
Views: 7316

Re: Pres. jackson 2sc2166 self distruction

I would set them both at 50mA, then check to make sure there is no more than 0.7v at the base pin of both, as I said above.
Dave.
by zodiac
Thursday 1st Sep 2011, 5:01
Forum: CB Radio Repair and Troubleshooting
Topic: Pres. jackson 2sc2166 self distruction
Replies: 15
Views: 7316

Re: Pres. jackson 2sc2166 self distruction

Alex, Your not using a 477, you have a 1969 in there, If you adjust the bias to 80mA it will probably overdrive the final (1969) you are using, there should be no more than 0.7v at the base of the final and driver, with a dead key on side band and the mic gain set at zero. If you think the capacitor...

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