| Author |
Message |
    
Yankee
Senior Member
Username: Yankee
Post Number: 1449
Registered: 7-2003
| | Posted on Tuesday, March 20, 2007 - 10:48 am: | 
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 Has anyone seen or heard of the receive RF mod to the 2SC2999 transistor on the Ranger TR-696 Freedom One radio??!! If anyone does know, which transistor is the one to change??
Thanks in advance for any and all input to my question.
Carl CEF-357
CVC-9 HAM-28
Flatlands of Oklahoma
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Patzerozero
Senior Member
Username: Patzerozero
Post Number: 3553
Registered: 7-2004
| | Posted on Tuesday, March 20, 2007 - 4:17 pm: |
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the 696fd1 is only SLIGHTLY different-if that-from the cobra 148f-gtl, which is the same as your grant xl. it's in the same spot as your XL's, carl! i think it's tr14, a 2sc1674. can't get to my schematics right now, but if you have 1 for the radio, just follow off the antenna connector to the rcv part of the radio. |
Bruce
Senior Member
Username: Bruce
Post Number: 4394
Registered: 9-2003
| | Posted on Tuesday, March 20, 2007 - 10:06 pm: |
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2sc1674 |
Yankee
Senior Member
Username: Yankee
Post Number: 1450
Registered: 7-2003
| | Posted on Wednesday, March 21, 2007 - 12:28 am: |
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Another question, why can't the Freedom One and like radios accept the same channel mods as the original 148-GTL and like radios, and not the P5 and P6 mod???
Carl CEF-357
CVC-9 HAM-28
Flatlands of Oklahoma
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2ir473
Intermediate Member
Username: 2ir473
Post Number: 110
Registered: 7-2002
| | Posted on Wednesday, March 21, 2007 - 8:40 am: |
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The newer Galaxy(CB)/Texas Ranger radios use the RCI-8719 pll, which had to be altered to get FCC approval, so that is why the modification is different from the older MB8719 pll chips.
As far as the receive mod you asked about, that transistor, along with a few Schottky diodes, does make a difference in the receiver of the radio. It mostly helps to reduce the white noise levels in your radio, which allows you to hear weker stations better.
There was another post about this mod, and there are people on the internet that have the package for about $10, if you can't find the components locally.
Paul
2IR473
CEF-218
CDX8412
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Yankee
Senior Member
Username: Yankee
Post Number: 1451
Registered: 7-2003
| | Posted on Thursday, March 22, 2007 - 12:02 pm: |
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 OK guys,we're back to the drawing board on the Ranger Freedom One. Q-14 is not a 2SC1674 it's a 2SC945. Upon installing a 2SC2999 in the Q-14 slot, it shut down the receive. I put the 2SC945 back in circuit at Q-14 and everything is OK.
Any ideas as to where we go from here on the 2SC2999 receive upgrade??
Again, thanks for any input on the question.
Carl CEF-357
CVC-9 HAM-28
Flatlands of Oklahoma
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Rumblefish
Junior Member
Username: Rumblefish
Post Number: 35
Registered: 12-2002
| | Posted on Friday, March 23, 2007 - 1:23 pm: |
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hey yankee, try that 2sc2999 in q-17, that is the rx amp. super receive mod, replace d30 and d31 with ecg 583 schottky diodes. find d9 and lift "banded end" of diode. add a 1.5k ohm resistor in series with d9. the d9 mod will really pick up the receive. if you do that mod, make sure close stations dont overload the front end of your radio. steve |
Rob5mike
Intermediate Member
Username: Rob5mike
Post Number: 187
Registered: 7-2002
| | Posted on Monday, March 26, 2007 - 12:37 pm: |
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TR17 rx amp
d30,d31 AM rec diodes
d1,d2 NB diodes |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 3564
Registered: 7-2004
| | Posted on Monday, March 26, 2007 - 2:04 pm: |
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sorry carl  . i knew it was a 1674, was close on the part #, memory isn't what it used to be  |
Slugger
New member
Username: Slugger
Post Number: 4
Registered: 3-2005
| | Posted on Sunday, November 13, 2011 - 12:23 pm: |
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Hello Rumblefish, I have so much white noise. I did the 2sc2999 mod help alot. Still alot of whit noise.Can I use a 583 schottky diodes on D9 and can I use higher or lower Then 1.5 Kohm resistor..Thanks |
