Hello,
1. Check K1 and K3 relays for correct operation. You can press PTT and tap them with couple harder "kicks" from top - example with plastic head of screwdriver.
While whistling into mic - observe power meter (can also be CB swr/pwr meter) if does it helps. This is first common issue with this rigs - relays.
2. If this will not help - we will need more data. Example: does radio receives correctly?
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Regards
Tomasz
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tomekdm sp7etd