Interesting topic for the X5105. I was not thrilled with the X5105 speaker and decided to DIY and built a custom, active stereo audio amp for this radio and other QRP radios equipped with a low-level stereo output jack. I found a similar kit to this on eBay and built it into an angled-front steel enclosure. The kit looks like this:

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It comes with 2 full range 1-inch speakers and powered by 5VDC. Just use the 2.5mm provided audio cable to connect between rig and audio amp.

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Upon first usage, I realized that amp audio spectrum was designed for music (approx. 100 – 15000Hz), too wide for this application. So, I found some web-articles on mechanical tuned ports for voice bandwidths and came up with PVC-pipe tuned ports that narrow the bandwidth to about 3KHz, or approx. 5000 – 8000Hz. I also added a switchable, passive LC crossover filter to help with the low bass/high treble rejection and a large volume control. In addition, I run it on a rechargeable NiMH rechargeable 9VDC battery that fits on the back and is long-running for /P POTA operations in the field.

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This amp is spectacular as it fills the area with loud, filtered CW. I would suggest this product for anyone who has an X5105 and does not like the OOB (Out-Of-Box) speaker audio. Finished product is below. Not pretty, but very functional ?

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Best 73, Lou N2JPR

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Sent from for Windows

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