2sc2999 upgrade
2sc2999 upgrade
I put the diodes in my trc 457 but now I need the transister upgrade. It was not to hard to relize the diodes was the am detector diodes but what transistor do I replace. Does anyone know where I put this transistor to finnish this upgrade.
Re: 2sc2999 upgrade
Here is the info I could find on my transistors can someone point out the right transitor for the upgrade.
TRANSISTOR USES:
TR1= NB AMP
TR2= NB AMP
TR3= NB AMP
TR4= RF ATT
TR5= RF AMP
TR6= AMP
TR7= AM TX AMP
TR8= RX AMP
TR9= RX AMP
TR10= RX AMP
TR11= AGC AMP
TR12-14 = SQUELCH AMPS
TR15= SSB DETECTOR AND AM AMP
TR16= MIC AMP
TR17= PA SWITCH
TR18= LIMITER
TR19= LIMITER
TR20= AF AMP
TR21= RX RF AMP
TR22= AM TX SWITCH
TR23= AM AMC
TR24= NO INFORMATION
TR25= AM POWER REGULATOR
TR26= AM POWER REGULATOR
TR27= CARRIER OSC.
TR28= AMP
TR29= NO INFORMATION
TR30= AMP
TR31= AMP
TR32= NO INFORMATION
TR33= NO INFORMATION
TR34= OSC
TR35= AMP
TR36= LED DRIVER
TR37= LED DRIVER
TR38= OSC
TR39= OSC
TR40= TRIPLER
TR41= NO INFORMATION
TR42= ALC AMP
TR43= TX FINAL AMP
TR44= TX DRIVER
TR45= RF PRE DRIVER
TR301= REGULATOR
TR302= REGULATOR
TR600= NB AMP
TR601= NB AMP
TRANSISTOR USES:
TR1= NB AMP
TR2= NB AMP
TR3= NB AMP
TR4= RF ATT
TR5= RF AMP
TR6= AMP
TR7= AM TX AMP
TR8= RX AMP
TR9= RX AMP
TR10= RX AMP
TR11= AGC AMP
TR12-14 = SQUELCH AMPS
TR15= SSB DETECTOR AND AM AMP
TR16= MIC AMP
TR17= PA SWITCH
TR18= LIMITER
TR19= LIMITER
TR20= AF AMP
TR21= RX RF AMP
TR22= AM TX SWITCH
TR23= AM AMC
TR24= NO INFORMATION
TR25= AM POWER REGULATOR
TR26= AM POWER REGULATOR
TR27= CARRIER OSC.
TR28= AMP
TR29= NO INFORMATION
TR30= AMP
TR31= AMP
TR32= NO INFORMATION
TR33= NO INFORMATION
TR34= OSC
TR35= AMP
TR36= LED DRIVER
TR37= LED DRIVER
TR38= OSC
TR39= OSC
TR40= TRIPLER
TR41= NO INFORMATION
TR42= ALC AMP
TR43= TX FINAL AMP
TR44= TX DRIVER
TR45= RF PRE DRIVER
TR301= REGULATOR
TR302= REGULATOR
TR600= NB AMP
TR601= NB AMP
Re: 2sc2999 upgrade
My schematic came in today. The first IF Amp is TR6. I Want to thank everyone for all the help I got on this question. After all thats what forums are for Getting answers when you need a little help.-
YosemitySam
- Dead Key
- Posts: 47
- Joined: Saturday 24th Feb 2007, 17:41
- Location: Stixs
Re: 2sc2999 upgrade
Hey, sorry no one answered you question, I get that a lot too. But I do have some info for future referance to those who want to do this mod to other radios. I don't know if you radio fall into it or not but, if not you have just added to my list and made it easier if I should have to do the mod in the future thanks for sharing.
The 2sc2999 and Schottky diodes 1n6263 are the part numbers.
Here's some info on the modifictions to various radio's.
ept-3600 board
such as Galaxy DX radios 33-99 Connex, Pluto's ext.....
Remove and replace TR17, D1, D2, D23,D24
ept0696, ept6900, ept0929 boards
sucha as Galaxy DX radios 919-2547 DX45MP-95T2 Ranger TR696, TR6300 and TR6900, Cobra 148F GTL DX+
Connex 4400,4800 ect......
Remove and replace Q17, D1,D2,D30,D31
ept-2950 boards
such as RCI2950 RCI2979, RCI12990, Galaxy Saturn Turbo, Galaxy 2527,ect.....
Remove and replace Q18,D1,D2,D34,D35
For Cobra 29, GTL,LTD,WX,ST ect.....
Remove and Replace TR7,D5,D6,D24
For Cobra 140 & 142 GTL's
Remove and Replace TR9,D1,D2,D21,D22
For Old style 148GTL you must move TR14 and put it in place of TR19 for SSB to receive.
Remove and replace TR14,D1,D2,D21,D22
Cobra 29xlr
Remove and Replace TR1,D1,D2,D20,D21
Cobra 25 LTD GTL's
Remove and Replace TR1,D4,D6
Unidens 66 same as Cobra 25 substitut Q for TR in some cases.
Usnidens 76 and 78 same as Cobra 29 but substitut Q for TR in some cases.
I'm not an expert, I have a learning diabliatiy that makes it hard to comperhend unless I get my hands on it, or explained in comman man langue in detail. I think the only stupid Question it the Questions not asked... Some people who have been doing something for years or been to school refuse to help someone on grounds of pride and the I'm to smart to answer you dumb idiots attitude. And thats why I struggle to learn, those smart enough to answer are two smart to answer me. Any answer is better than no answer, in my hand book of the unknown. Hope this helps somone or at least maid those mad who are mad.
The 2sc2999 and Schottky diodes 1n6263 are the part numbers.
Here's some info on the modifictions to various radio's.
ept-3600 board
such as Galaxy DX radios 33-99 Connex, Pluto's ext.....
Remove and replace TR17, D1, D2, D23,D24
ept0696, ept6900, ept0929 boards
sucha as Galaxy DX radios 919-2547 DX45MP-95T2 Ranger TR696, TR6300 and TR6900, Cobra 148F GTL DX+
Connex 4400,4800 ect......
Remove and replace Q17, D1,D2,D30,D31
ept-2950 boards
such as RCI2950 RCI2979, RCI12990, Galaxy Saturn Turbo, Galaxy 2527,ect.....
Remove and replace Q18,D1,D2,D34,D35
For Cobra 29, GTL,LTD,WX,ST ect.....
Remove and Replace TR7,D5,D6,D24
For Cobra 140 & 142 GTL's
Remove and Replace TR9,D1,D2,D21,D22
For Old style 148GTL you must move TR14 and put it in place of TR19 for SSB to receive.
Remove and replace TR14,D1,D2,D21,D22
Cobra 29xlr
Remove and Replace TR1,D1,D2,D20,D21
Cobra 25 LTD GTL's
Remove and Replace TR1,D4,D6
Unidens 66 same as Cobra 25 substitut Q for TR in some cases.
Usnidens 76 and 78 same as Cobra 29 but substitut Q for TR in some cases.
I'm not an expert, I have a learning diabliatiy that makes it hard to comperhend unless I get my hands on it, or explained in comman man langue in detail. I think the only stupid Question it the Questions not asked... Some people who have been doing something for years or been to school refuse to help someone on grounds of pride and the I'm to smart to answer you dumb idiots attitude. And thats why I struggle to learn, those smart enough to answer are two smart to answer me. Any answer is better than no answer, in my hand book of the unknown. Hope this helps somone or at least maid those mad who are mad.
Re: 2sc2999 upgrade
Here is my findings on Replacing the standard 2sc1674 with 2sc2999 in my President Lincoln:
When I originally put in the 2999 transistor it made a fantastic difference, the signal meter that usually sat about S5 now sat at S0 and weak signals could be heard... however, the signal meter was screwed up and the perfectly audible signals would not break the squelch.
I got fed up with the signals not breaking the Squelch and the S-meter reading wrong so i decided to replace the 2sc2999 and put back a new 2sc1674. With the new 1674 transistor, the signal meter still sat at S0, the meter read correctly again and the weaker signals were able to get through the squelch. (obviously the original 2sc1674 was worn out).
After this I tried replacing the 1674 with a 2sc3356. The 3356 was better than the 2999 in that it didn't screw up the signal meter, but i could hardly notice any difference over the new 1674 in real world performance.
I have since put the new 2sc1674 back in my radio and it is working well. My advice is to try a new original transistor before you mod your radio.
When I originally put in the 2999 transistor it made a fantastic difference, the signal meter that usually sat about S5 now sat at S0 and weak signals could be heard... however, the signal meter was screwed up and the perfectly audible signals would not break the squelch.
I got fed up with the signals not breaking the Squelch and the S-meter reading wrong so i decided to replace the 2sc2999 and put back a new 2sc1674. With the new 1674 transistor, the signal meter still sat at S0, the meter read correctly again and the weaker signals were able to get through the squelch. (obviously the original 2sc1674 was worn out).
After this I tried replacing the 1674 with a 2sc3356. The 3356 was better than the 2999 in that it didn't screw up the signal meter, but i could hardly notice any difference over the new 1674 in real world performance.
I have since put the new 2sc1674 back in my radio and it is working well. My advice is to try a new original transistor before you mod your radio.
Norm