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Discussion in 'CB Radio Modifications' started by Wire Weasel, May 24, 2009.
the transistor to change will be Q17.
the parts list shows it as a 2SC1674 but i think Galaxy has since improved that part and is using a 2SC2986 or 2987; cant remember.
the transistor they are using now is just about as good as the 2999.
i didnt notice any difference when i replaced it in my 959.
the diode changes however, will help a lot.
dont forget to check Q54 to see if its a 2SB827 and not a 2SB754.
pretty sure Galaxy is using the 2SB827 exclusively now, but still worth checking.
if you do want to replace Q54, the 2SB817 is the part to use.
good luck, nice radio,
What's the part number for the Schottsky? TNX
either will work the same.
you can get the 1N6263 from mouser electronics.
here is a link:
hope this helps,
B&D Enterprises: Part #2SC2999E-SPA
Two of the diodes are part of the detection circuit, and can make it a bit too sensitive - in the sense that they can even overload the receive. The other two diodes designated are used in the noise blanketer circuit. Cobra 29's only need 3; most other radios need 4. Truth is, the transistors are the parts responsible for knocking down the noise and improve the signal level.
Some radios often will have a better receive if two 2SC2999E's are used - one for the first IF stage amping and the other for the SSB receive amping. Their advantage in use is to give the receive more signal gain before noise. The diodes aren't always the most popular mod, but the transistors are always welcome to any radio - IMO. Personally. I would do the diodes too - I have done this to all of my radios when adding the transistors. After these mods, realignment of the radio isn't necessary - unless it needed it to begin with. These mods cannot right an out of tune radio; they just clean up its act favorably...
I've done a couple of Cobra 29's and 148's with really phenomenal results. Some think these mods are petty; I think these mods are useful and quite noticeable. I don't know what kind of IF transistors are in my Galaxy DX 99V. But if they are substandard and be cross exchanged, I will put the Sanyo 2SC2999E's in it - too. The receive in the Galaxy is already very nice, but it will still work better with the transistor mod.
Fisher technologies schottkey receive kit.
Fisher technologies has a nice receive kit for all
radios. Please follow this link for the details.
Fisher CB Radio Technologies - DX Receive Kit & Manuals
They give you all the parts and instructions for $7.00.
I'll keep everyone informed of my results.
Doc, 599, Boston Mass.
The NB works fine.
Overall it was a few dollars well spent.