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Charliebrown
Posted on Friday, November 01, 2002 - 12:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

i would like to have modifications for the 2985dx radio. in my first message i made a error and typed in the wrong model number. sorry about that.
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Charliebrown
Posted on Monday, May 19, 2003 - 6:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

it has been 6 months since i asked for mods. is there any mods. like super swing or another way to get more power out of this radio? and no, i dont mean get a booster.how about it 307, inspector or some of you other people. how about us getting down and talk some mod. info.here. thanks. c.b.
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Hootyal
Posted on Tuesday, May 20, 2003 - 4:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I've seen mods for this radio on other forums. The am limiter is R301. I've heard of allot of people that try it...didn't like it.. then put it back.A pain with such small parts. I have one that has a regular tune (parts are labeled inside radio) clarifier open (mod is on the rci website) and I love it.
Hope this helps. Hooty Hoo
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2600
Posted on Tuesday, May 20, 2003 - 5:33 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

The thundering silence has a lot to do with the way the circuit board is constructed. All the previous models of this type radio used so-called "through-hole" components, parts that have wire leads or pins that solder to a hole in the circuit board. The "DX" radio circuit boards are built with "surface-mount" technology. All but a few of the parts have no lead wires, just short flat pins, or a metallized edge. The solder "glues" these parts to the copper foil, with no holes drilled to mount it.

Good news is that the factory's overall soldering quality MUST be high, or else parts just fall off. The "DX" models should have far fewer "cold solder-joint" breakdowns than the earlier models.

The bad news is that modifying the circuitry on a surface-mount circuit board requires tools and expertise beyond what you can buy at RatShack. A reputable tech will probably not recommend that a hobbyist tear into a surface-mount radio to 'mod' it. I don't.

There are ways to get around some of this to boost the AM audio, but without pictures it's a lot of trouble to describe. Somebody (else) should put up a step-by-step web page with pictures showing how to improve the AM audio. Without that kind of explicit description, there's too much potential to "pop" the wrong part and disable some major function. With an older circuit board, undoing an "oops" mistake isn't too tough. On a surface-mount board, you are performing without a net, so to speak. If you fall, you go 'splat'.

73

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