Search found 258 matches

by timrim
Sunday 14th Dec 2008, 16:14
Forum: CB Radio Modifications
Topic: 2sc2312?
Replies: 2
Views: 5876

2sc2312?

Yes, these will work well in a 29.
by timrim
Sunday 14th Dec 2008, 10:01
Forum: CB Radio Modifications
Topic: Dumb question for cb experts.
Replies: 4
Views: 7353

Dumb question for cb experts.

Yes, its possible. You will need to mount it on a heatsink capable of dissapating the heat. It is easier buying a stinger board, that has the heatsink and circuit board included, however, I find the heatsink supplied too thin, so I always add more aluminum.
by timrim
Sunday 14th Dec 2008, 6:56
Forum: CB Radio Modifications
Topic: Magnum Alpha Force Mod needed
Replies: 4
Views: 7388

Magnum Alpha Force Mod needed

Hi Chevin, I know that the forum has a few bugs, but I think its still a great place. I will probably hang around until they take it down, and see if I can help out. I have had great help here already from Rick, Defpom and the others, so I can't just abandon them. I really enjoy it when I am able to...
by timrim
Saturday 13th Dec 2008, 9:50
Forum: CB Radio Modifications
Topic: Magnum Alpha Force Mod needed
Replies: 4
Views: 7388

Magnum Alpha Force Mod needed

I tried to do a search, but i get the following error: SQL Error : 2006 MySQL server has gone away

Does anyone know the conversion for this radio?
by timrim
Friday 12th Dec 2008, 9:34
Forum: CB Radio Modifications
Topic: Ranger 2950DX Key
Replies: 1
Views: 4332

Ranger 2950DX Key

Does anyone have the schematic of the "Key" that plugs into the processor on this radio?
I am very curious as to how they work.
by timrim
Friday 12th Dec 2008, 7:38
Forum: CB Radio Modifications
Topic: new magnum s-980 50 WATTS???
Replies: 5
Views: 8568

new magnum s-980 50 WATTS???

It should be doing more than 55 on AM, 15-20 watts more at least. Remember that a shop will tune the radio on a dummy load which represents a perfect 50 ohm load and a 1:1 swr, so there is always going to be some difference, but that does seem excessive. Are you sure that your not dropping voltage o...
by timrim
Sunday 7th Dec 2008, 8:50
Forum: CB Radio Amplifiers
Topic: Build this 1.5KW Mosfet amp
Replies: 1
Views: 6496

Build this 1.5KW Mosfet amp

I don't think this project is for anyone that does not wish to risk losing big money on the MOSFETs if something goes wrong, I have been doing some research and so far, I have been told the MOSFETs sell for about $165 each. I have a couple of exact price quotes on the way, but unless they are cheape...
by timrim
Saturday 6th Dec 2008, 15:38
Forum: CB Radio Modifications
Topic: EURO 3900 IRF520 conversion
Replies: 10
Views: 16501

EURO 3900 IRF520 conversion

CB20Ws are garbage, I would take the 2312's.
by timrim
Friday 5th Dec 2008, 11:18
Forum: CB Radio Amplifiers
Topic: Build this 1.5KW Mosfet amp
Replies: 1
Views: 6496

Build this 1.5KW Mosfet amp

I am going to research parts and prices, if economical, I will be building one, looks very easy, I am just not sure about cost of parts.
by timrim
Friday 5th Dec 2008, 5:50
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

If c79, c80 and c81 test good, then at this time swap out IC2 and see if symptoms disappear.
by timrim
Thursday 4th Dec 2008, 21:50
Forum: CB Radio Repair and Troubleshooting
Topic: President Jackson No TX No RX switching
Replies: 13
Views: 25292

President Jackson No TX No RX switching

Thanks for the reply Rick, I have some 2SA1282's so I will swap that out to keep things safe.
by timrim
Thursday 4th Dec 2008, 17:06
Forum: CB Radio Repair and Troubleshooting
Topic: President Jackson No TX No RX switching
Replies: 13
Views: 25292

President Jackson No TX No RX switching

Has anyone else discovered that the schematic calls for a 2SD355E for TR31 and a 2SB525 for TR33, but yet the radios actually come with 2SD355E installed in both locations, apparently they had TR33 in backwards with a 2SD355E, and it must have worked, but I simply replaced TR33 with a 2SA473, and it...
by timrim
Thursday 4th Dec 2008, 12:21
Forum: CB Radio Repair and Troubleshooting
Topic: President Jackson No TX No RX switching
Replies: 13
Views: 25292

President Jackson No TX No RX switching

I just found out why the PLL was unlocked, C97 was shorted (10volt cap) Radio now receives, transmit not working, transmit light not working. Voltage on pin 8 of PLL is now 8 OK now for the new voltage readings on the following: TR31 E=7.7 Rx 0volt Tx B=8.3 Rx 0 TX C=8.8 TR32 E=0 B=.8Tx 0Rx C=8.4Rx ...
by timrim
Thursday 4th Dec 2008, 12:08
Forum: CB Radio Repair and Troubleshooting
Topic: President Jackson No TX No RX switching
Replies: 13
Views: 25292

President Jackson No TX No RX switching

0 volts on pin 8, so that means the PLL is unlocked I did not suspect that, because when I got the radio TR 33 was bad and I replaced it, so I assumed the problem had to be in switching...Another lesson learned! Unhooking 1 end of R171 allows the receive light to go out when I press transmit, but no...
by timrim
Thursday 4th Dec 2008, 8:18
Forum: CB Radio Repair and Troubleshooting
Topic: President Jackson No TX No RX switching
Replies: 13
Views: 25292

President Jackson No TX No RX switching

Radio Make and Model: President Jackson PCB Number: PB042 PLL Number: MC145106P Test gear available: Full lab setup Symptoms: No TX and RX Switching What is working: It lights up What has been tried: Tested TR31, TR32, TR33, D59, D61, D66 check ok on ohm meter Pulled and tested R187,R202,R168,R203,R...
by timrim
Wednesday 3rd Dec 2008, 22:37
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

Is the 11Mhz signal at TR-29 clean?
by timrim
Wednesday 3rd Dec 2008, 13:34
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

Check 10.240 signal at PLL, if noise is there, replace the 10.240. If still noisy, replace the PLL chip.
by timrim
Wednesday 3rd Dec 2008, 9:17
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

I would take out c-90 and c-92 and test them.
Is the signal on TP-10 normal?
by timrim
Wednesday 3rd Dec 2008, 8:10
Forum: CB Radio Modifications
Topic: EURO 3900 IRF520 conversion
Replies: 10
Views: 16501

EURO 3900 IRF520 conversion

They are discontinued, and, if you do find them, they are quite expensive, I would not hesitate going with a mosfet at this time, they work really well.
by timrim
Tuesday 2nd Dec 2008, 9:28
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

Are the voltages on IC5 normal?
Is the VCO output at TP2 clean?
by timrim
Tuesday 2nd Dec 2008, 9:20
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

Do the DC voltages on IC 4 (Voltage reg) look clean on a scope?
by timrim
Tuesday 2nd Dec 2008, 9:10
Forum: CB Radio Repair and Troubleshooting
Topic: Test your knowledge Uniden (President) Grant PC-409
Replies: 43
Views: 115393

Test your knowledge Uniden (President) Grant PC-409

If you examine the output of IC 5 (TX Mixer) on a scope, does the signal look normal or is it distorted? If you also examine the input and output of IC 6 on a scope (Audio output) does the signal look normal or is it distorted? Do the DC voltages on IC 4 (Voltage reg) look clean on a scope? Given th...
by timrim
Monday 1st Dec 2008, 10:38
Forum: CB Radio Repair and Troubleshooting
Topic: Need help figureing out resistor Value Needed
Replies: 5
Views: 7437

Need help figureing out resistor Value Needed

3 of those will work ok, they may get warm on transmit, but should not be a problem. I suggested double the max expected current just to have a hefty margin for error.

They are rated at 3 amps, so you can pull up to that through them without frying them.
by timrim
Monday 1st Dec 2008, 10:25
Forum: CB Radio Repair and Troubleshooting
Topic: Need help figureing out resistor Value Needed
Replies: 5
Views: 7437

Need help figureing out resistor Value Needed

You would need a monster resistor because the current draw of the radio on transmit may be approx 2 amps. You can run the radio off 15 volts, but if you need to get it down, a better way would be to use 3 diodes in series with the positive lead, the diodes will need a rating of at least double of yo...
by timrim
Monday 1st Dec 2008, 10:15
Forum: CB Radio Repair and Troubleshooting
Topic: Test Your Knowledge Ranger Superstar 158EDX MOSFET model.
Replies: 40
Views: 223616

Test Your Knowledge Ranger Superstar 158EDX MOSFET model.

Is zener diode D-70 breaking down? what does the scope tell us when put on Q-30 and Q-31?
by timrim
Sunday 30th Nov 2008, 16:17
Forum: CB Radio General
Topic: Can't reply to a PM
Replies: 6
Views: 8525

Can't reply to a PM

Well, now I can read the messages, but when I hit send, I get the same message, although, perhaps you got reply anyway?
by timrim
Sunday 30th Nov 2008, 12:36
Forum: CB Radio Repair and Troubleshooting
Topic: SS158 EDX 23mhz when turned on???
Replies: 11
Views: 16962

SS158 EDX 23mhz when turned on???

Ranger does not like to sell direct, I have had that problem as well, usually they will refer you to one of their distributors.
by timrim
Sunday 30th Nov 2008, 10:45
Forum: CB Antenna Systems
Topic: grounding antennas
Replies: 1
Views: 5836

grounding antennas

On the volvo, I use a bird perch mount which works well. If you do not wish to go that route, your antenna may need a counterpoise, which is a couple pieces of #14 wire cut to 1/4 wavelength and stretched out.
by timrim
Sunday 30th Nov 2008, 8:35
Forum: CB Radio General
Topic: Can't reply to a PM
Replies: 6
Views: 8525

Can't reply to a PM

Still no go, someone else sent me PM, was that you?
by timrim
Saturday 29th Nov 2008, 18:14
Forum: CB Radio Repair and Troubleshooting
Topic: Power Mic Problems
Replies: 8
Views: 14512

Power Mic Problems

If adjusted properly they should work ok, keep in mind that the problem may be the talkback adjustment in the mic.
by timrim
Saturday 29th Nov 2008, 9:57
Forum: CB Radio General
Topic: Can't reply to a PM
Replies: 6
Views: 8525

Can't reply to a PM

Ok, thanks.
by timrim
Saturday 29th Nov 2008, 7:49
Forum: CB Radio General
Topic: Proper thread for topic
Replies: 3
Views: 5698

Proper thread for topic

It did not allow the file to be sent, got a message that the server reset the connection. I am not sure, but I may have fixed the problem, if not, I will post it with a link to the service manual in case someone is willing to take the time to download it. I will know for sure in the next several day...
by timrim
Saturday 29th Nov 2008, 7:46
Forum: CB Radio General
Topic: Can't reply to a PM
Replies: 6
Views: 8525

Can't reply to a PM

Someone sent me a PM, but I get the following message when I click it to read it: "Sorry, but you cannot initiate private messages, users with special ranking can message you, and you can reply to them, you just cannot start a new message thread." Someone with special ranking must have sen...
by timrim
Saturday 29th Nov 2008, 7:42
Forum: CB Radio Alignments
Topic: DX959 - using the onboard frequency counter for alignment?
Replies: 4
Views: 9906

DX959 - using the onboard frequency counter for alignment?

Your counter probe is loading down the circuit, if you have a 10:1 probe, use it, there will be less loading of the circuit.
by timrim
Saturday 29th Nov 2008, 7:36
Forum: CB Radio Modifications
Topic: cobra 138xlr talkback
Replies: 3
Views: 5744

cobra 138xlr talkback

You need a resistor with a 10uf cap in series with it connected across 2 of the points on the relay. If you cant find the points, I will see if I can dig up a schematic.
by timrim
Friday 28th Nov 2008, 22:58
Forum: CB Radio Repair and Troubleshooting
Topic: SS158 EDX 23mhz when turned on???
Replies: 11
Views: 16962

SS158 EDX 23mhz when turned on???

The intermittent transmit problem could be bad solder connections, I would check for those. The problem with having to press the band button is acting like a problem with the math chips (binary adders). I have had this problem with radios in past and found one of the chips bad. I would check for bad...
by timrim
Friday 28th Nov 2008, 17:53
Forum: CB Radio Repair and Troubleshooting
Topic: tx meter hardly oves
Replies: 13
Views: 17320

tx meter hardly oves

Problem here is that the Lincoln does not use an analog meter, its digital. He could attempt to turn the TX meter adjustment (might be R-117 if memory serves me correctly). If that does not work, then its a safe bet the final is dead.
by timrim
Friday 28th Nov 2008, 7:03
Forum: CB Radio Repair and Troubleshooting
Topic: Test Your Knowledge Ranger Superstar 158EDX MOSFET model.
Replies: 40
Views: 223616

Test Your Knowledge Ranger Superstar 158EDX MOSFET model.

Sorry Rick, I have been busy with a sick TS-940SAT, or I would have been offering more ideas in here, the SS-158EDX is one of my favorite radios! Ok, check the following parts: Check the following varactors> D-99, D-100, D-148 Check the following caps> C103, C107, C112 You said that sometimes that t...
by timrim
Thursday 27th Nov 2008, 9:54
Forum: CB Radio General
Topic: Proper thread for topic
Replies: 3
Views: 5698

Proper thread for topic

I have a Kenwood TS-940S with a possible VCO problem, where is proper place to post it? Also I have the complete service manual in PDF format, but it is 67 megs un-archived. Is it possible to upload it for possible help with radio?
by timrim
Monday 24th Nov 2008, 8:03
Forum: CB Radio Repair and Troubleshooting
Topic: cobra 29 irf520 mod problem
Replies: 6
Views: 9195

cobra 29 irf520 mod problem

Yes, it will work fine. That is what some of the older versions used.
by timrim
Sunday 23rd Nov 2008, 19:48
Forum: CB Radio Repair and Troubleshooting
Topic: Test Your Knowledge Ranger Superstar 158EDX MOSFET model.
Replies: 40
Views: 223616

Test Your Knowledge Ranger Superstar 158EDX MOSFET model.

Are voltages correct on IC2 (VCO) and IC9 (TX Mixer)?
by timrim
Sunday 23rd Nov 2008, 9:45
Forum: CB Radio Repair and Troubleshooting
Topic: Test Your Knowledge Ranger Superstar 158EDX MOSFET model.
Replies: 40
Views: 223616

Test Your Knowledge Ranger Superstar 158EDX MOSFET model.

The first thing I would do is press around on board to see if there is bad soldering. Then align the PLL and see if symptoms remain.
But I bet its not quite that easy. :)
by timrim
Friday 21st Nov 2008, 8:00
Forum: CB Radio Modifications
Topic: Echo Board with no Externat Knobs ?
Replies: 2
Views: 5543

Echo Board with no Externat Knobs ?

Bandit is the name. I usually keep a couple on hand in case someone just wants a "set it and forget it" echo.
by timrim
Wednesday 19th Nov 2008, 20:45
Forum: CB Radio Repair and Troubleshooting
Topic: Subject: Test Your Knowledge (President Lincoln/HR2510).
Replies: 35
Views: 246994

Subject: Test Your Knowledge (President Lincoln/HR2510).

Yea, somewhere along the line, I went off course and I was stuck on 2 transistors that did not have their collector voltage! :oops:
by timrim
Tuesday 18th Nov 2008, 22:26
Forum: CB Radio Repair and Troubleshooting
Topic: Subject: Test Your Knowledge (President Lincoln/HR2510).
Replies: 35
Views: 246994

Subject: Test Your Knowledge (President Lincoln/HR2510).

Is C-130 shorted? Did someone ask if Q124 was shorted emitter to collector?
by timrim
Tuesday 18th Nov 2008, 15:43
Forum: CB Radio Repair and Troubleshooting
Topic: Subject: Test Your Knowledge (President Lincoln/HR2510).
Replies: 35
Views: 246994

Subject: Test Your Knowledge (President Lincoln/HR2510).

Hmmm, I need to go back and re-read everything. I think I missed a valuable clue somewhere. This is why it would be nice for manufacturers to put peak to peak voltages on various stages in service data. Ok let me re-ask a question differently. Is the 27mhz signal at the base of Q-134 normal amplitud...
by timrim
Monday 17th Nov 2008, 21:37
Forum: CB Radio Repair and Troubleshooting
Topic: Subject: Test Your Knowledge (President Lincoln/HR2510).
Replies: 35
Views: 246994

Subject: Test Your Knowledge (President Lincoln/HR2510).

I made a typo in my last post and just corrected it.

Is Q-134 bad? What are voltages on Emitter, Base and Collector?

If Q-134 is good, then I would look at bias, perhaps the transistor is not fully turning on. Check R-168 and R-169. Is C135 shorted?
by timrim
Monday 17th Nov 2008, 13:23
Forum: CB Radio Repair and Troubleshooting
Topic: Subject: Test Your Knowledge (President Lincoln/HR2510).
Replies: 35
Views: 246994

Subject: Test Your Knowledge (President Lincoln/HR2510).

Is there a 27Mhz signal at Q-134 emitter? If not than Q-134 is suspect. I would also check Resistors 164 and 167. If a 27 MHZ signal does exist at the emitter of Q-134, then check for a 27 mhz signal at C120 L132 C134 junction, if 27mhz signal exists here than C120 is open or bad soldering. If 27mhz...