| Author |
Message |
    
Drifter_8291
Junior Member
Username: Drifter_8291
Post Number: 17
Registered: 10-2004
| | Posted on Wednesday, November 09, 2005 - 6:01 pm: | 
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Hi I have read somewhere before that you can replace the receive diodes with Schottky diodes (1N5817/ECG - NTE583 . I was wondering what what number the diodes are so I could do this and if anyone on here has done this before ? What were your results?
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Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 810
Registered: 9-2004
| | Posted on Wednesday, November 09, 2005 - 7:10 pm: |
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in a 148gtl, the diodes to replace are D1,D2,D21, and D22. (no typos here, i double checked)
also, if you are going to do this mod, do yourself a big favor and replace TR14 (Q14) with an NTE107 or 2SC2999 (equivilent). this will give qa 6db increase in your signal to noise ratio. you will notice a big difference; its one of my favorite mods! after you replace TR14, use the stock transistor you took from TR14's spot, and put it in place of TR19. TR19 is a 2SC945 stock.
TR14 is a 2SC1674 stock.
the TR14 change is for AM
the TR19 change is for SSB.
you will love these mods, and they are tried and true.
if you do it right they will work great!
good luck,
matt |
Bronzepony
New member
Username: Bronzepony
Post Number: 9
Registered: 12-2005
| | Posted on Thursday, December 15, 2005 - 11:20 pm: |
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will this help the recieve they have no ears i am a cobra fan but this radio can not hear |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 2062
Registered: 7-2004
| | Posted on Friday, December 16, 2005 - 4:08 pm: |
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?????
the REAL cobra 148's(&2000's, etc) have quite possibly the BEST receive of ANY CB radio-EVER, or awful close to it! |
Bronzepony
Junior Member
Username: Bronzepony
Post Number: 11
Registered: 12-2005
| | Posted on Saturday, December 17, 2005 - 10:47 am: |
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I HAVE A 148F NOT DX MINE MAY NEED ALINMENT BUT IT WILL NOT HEAR AS GOOD AS MY 44V |
Im4jc
Junior Member
Username: Im4jc
Post Number: 31
Registered: 11-2005
| | Posted on Saturday, January 07, 2006 - 12:59 pm: |
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A 148 not having as good of ears as a 44V?
Break one-nine for a reality check.
Dude, your 148 isn't aligned properly. The 44V has nowhere NEAR the receive of a 148. |
Gumpit
New member
Username: Gumpit
Post Number: 9
Registered: 11-2005
| | Posted on Wednesday, March 15, 2006 - 5:43 pm: |
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If your 148 says Malaysia on the back.Trade it in for a real one.One that says Taiwan or preferably Philippines. |
Airplane1
Advanced Member
Username: Airplane1
Post Number: 725
Registered: 5-2004
| | Posted on Thursday, March 16, 2006 - 7:36 am: |
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will this mod work on a 2985dx or grant xl?
AP |
Bruce
Senior Member
Username: Bruce
Post Number: 3652
Registered: 9-2003
| | Posted on Thursday, March 16, 2006 - 8:51 am: |
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airplane
I tried the diodes on a grant LT with limited results however the 2sc2229 mod works great |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1308
Registered: 9-2004
| | Posted on Thursday, March 16, 2006 - 5:51 pm: |
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should work on any radio that uses germanium diodes in the detector and NB circuits. (im pretty sure that the mods for the 2950 are very close to the 2985. not completely sure though)
bruce, watch that typing finger! the transistor is 2SC2999.
he must've been very happy when he was typing. LOL
did you ever get my reply to your email bruce?
matt |
