TYT TH-9000D Plus Caution
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I have been investigating the TYT TH-9000D Plus as a possible low-cost alternative to the now obsolete Alinco DR-135 series for Winlink VARA FM WIDE.? While checking the output spectrum for an anomaly found in the Alinco Mark 3 versions, I discovered that two of my three TYT TH-9000D Plus radio have a serious defect in the transmitter.? See the attached spectrum analyzer captures of a mike key down with no modulation.? Strong side bands covering the 2m band and extending outside the band.?
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These radios were bought on Amazon and the first is okay, but the next two arrived with the defect.? This is an insidious failure because the radio still receives and transmits and can still make contacts. ?The failure is only evident on a spectrum display (or if you cause interference and it is reported to you).? This issue shous up at high (65W) and mid (25W) power bit they look good at low power.? I think 65 Watts is pushing it for the PA module used so I plan to only operate my good radio at mid, 25 Watt power.
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