From the About page on hfsignals.com website:
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What kind of support will I get?
The HF Signals kits and radios are supplied as-is without any promise that they will work to any particular specification. That said, thousands of BITX transceivers supplied by HF Signals work across the world. There is an active and very informative forum for learning and getting help that is entirely driven by the builder community. Join us on?/g/bitx20
Ken, N2VIP