I tend to agree here, the FT 847? was never the best for HF, you could change all the pin diodes, you could also fit 10 to 15dB attenuator, this will help on RX, and also help when the Tx is on the 3000.
Most TX/RX change over relays only have 12 to 15dB isolation. You cold also fit some back to back diodes on the RX path
73 Andrew
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Andrew Lenton