How are you keying the rig?? If you key the rig with CAT, the audio
needs to come in from the mike plug in the front.? Key the rig via
the TRS jack, feeding audio in to the same, and it should work.?
Similarly, if you are doing VHF/UHF packet, key the rig and feed
audio into the DIN port.? For the TRS port, you'll need a resistor
and DC-blocking cap to merge the audio and PTT signals; it's the
same "interface" as is often used to interface to an HT.? The DIN
port has separate PTT and Audio pins, but it's for FM Packet.
For some unknown reason, keying the rig via CAT takes the audio from
the mike input, which is probably the least useful place to take it
from.
Greg? KO6TH
HI8RMQ via groups.io wrote:
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I have seen some 847 with the same problem, and there's a
common thing, they all where using some interface for FT8.
Maybe an excesive audio or impedance problems, I dont know,
fry something related to the modulation stage. There is a
carrier, algo works in 2m, but in HF is gone, so SSB obvioulsy
wont work. Have a tech friend with 3 847 with the same problem
and cant proceed properly because cant find a decent service
manual. Any help will be appreciated.
