(transmitter need receiver) were interconnected on test stand to have on receiver signal S9+ 20dB and detuned by 20kHz. Modifications schematic drawing:Īnd what is the result? Check audio records (bad quality, but still clear) before and after modification here and here. Transceiver modification can be reversed to original status easy. This modification is very simple, in the transceiver is not needed any readjustment and all functions (such a SWR protection) stay the same as before. Into ALC loop is added new tantalum capacitor C1070 as well on value 1♟/35V, which together with Q1023, R1082 and R1086 creates quasipeak detector with regulation time abt. On the board is removed original C1070 1♟/50V. Original ALC circuit is in the modification changed to peak detector. ALC modification is focused on the circuit changes on AF-CNTL board.
#YAESU FT847 NO POWER ON SIDEBAND HOW TO#
And because FT847 transceiver is quite popular we are pleased to bring you recommendation how to modify ALC circuits for transmitter splatters suppression. Beside many of other problems (look here), like phase noise of oscillators and more - some transceivers has even serious problems with transmitter splatters.
When we visit that station, the only response to our complaints is uncomprehending look of operator, because he is using "professional equipment" and so all should be perfect. His signal has splatters over whole band and the result is, that our competitors already have within few hours of contest tes QSO more. You know this situation from the VHF Contest for sure - on the opposite hill is the station with commercial equipment and solid state PA.
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