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[quote:ba0c553746]The radio already receives 1610 am. I’m just looking for a way to improve that reception. [/quote:ba0c553746]
Sorry, my mistake. Sometimes I don’t read carefully enough.
Small, cheap portable transistor radios are usually sensitivity-crippled for several reasons. First, because they are cheap, they have minimal component count and a simple design. This may vary across manufacturers. Secondly, they suffer from a small ferrite loopstick antenna and no ground such as you tend to get with an AC plug-in radio. The small antenna and lack of a ground can be overcome with high RF amplification, but this is difficult to achieve while still getting good overload protection. Higher quality portables can do this with good design and at a higher price.
Here is one thing you could try. If the oscillator vs. antenna tuning tracking is off (possibly the case in a cheap radio), it may come factory tuned as a compromise. You might benefit by tweaking the antenna stage tuning capacitor trimmer to peak at 1610.
As far as adding wire to the antenna goes. If you add turns to the ferrite loopstick, you will detune the antenna stage. You may be able to compensate by adjusting the same trimmer mentioned above, but with too many additional turns, you will go out of range of the trimmer adjustment. A possible better approach would be to add an “antenna” to the loopstick by connecting one end of a wire to the hot side of the loopstick and wrapping it aroung the inside of the case several times. Leave the other end disconnected. This will also likely detune the antenna stage somewhat, but will likely be within the range of the trimmer.