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Earthing and shielding problems causing self-oscillation and SWR problems. Yaseu either completely ignored or never considered the possibility of Mosfet RF thermal runaways, by not designing prevention or monitoring heat-sensing circuits for the SRF output stage.
These various Yaseu modifications are available on this web site. However, over a long period, the distressed Yaseu engineers have not managed to find the real solutions to these technical problems, which do raise a few questions. Taking into the factor of a bios idling current of. Hence, there is a definite need for a modification to the air-cooling fan system to be continually running all the time.
I question the reasons why the Yaseu engineers would design this output stage to be running in Class AB Bios mode continually all the time. Hence in Class C Bios operation, there would be no heat and no blow-ups, because there would be hardly any quiescent current flowing through the TX output Mosfet RF stage. There is no technical reason other then for a small reduction of power output or unless using SSB modulation why the SRF cannot operate in Class C Bios operation, all the time.
Why did Yaseu not make the FT computer programmable? All they had to supply was an inexpensive computer cable and some software. FT can easily handle extra bands 16 and memory; and if you can program them, wow. This computer programming would also bypass the frequency limitations and restrictions, able to set mode and repeater offsets, all within technical limitations.
Why they did not include an inexpensive AM filter and a stable oscillator, making it very saleable item for number of other applications? I understand that the S as in SRF stands for shit. You can always use F2 or a rubbery glue, to hold things together when taking out damaged devices.
Barium Oxide is a very poisonous substance to inhale. Never dispose of it in landfills. Stray electrostatic voltages caused by incorrect handling techniques can easily damage these devices. If you do not know what you are doing, always pay somebody else who does. After installing the new device, always check the Bios current flowing through the device. The idling current in AB operation should never exceed 0.
Use these figures at your own risk. Of course, you can always operate in the safer Class C operation mode. Make sure the cooling fan modification is working all the time. Consequently, the devices Bios current increases, producing more self heat, and then more bios current, and so on, to point when it will self destruct.
By increasing the Mosfets gate into the positive region, increases the current of the device. They have similar characteristics to Pentode tubes, but they are current devices. More Yaesu Radioamateur Transceivers.
Yaesu Manuales en Español
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Yaesu FT-100D (FT 100 D FT100D) user and service manual, modifications
Duplexers The ATAS is designed to tune on all the bands on which the radio transmits including 2m and 70cm. Therefore, this pigtail must always be connected to the ATAS for tuning purposes. For example, if you tune to the weather band at Mhz, it will appear in the list between the 2M and 70cm bands. That leaves all the ham bands grouped together, bracketed by the other two frequencies. Factory Modifications There are two common modifications retrofitted to the FTs manufactured prior to If you want to find out when your unit was manufactured, click here.
Yaesu FT-1000D (FT 1000 D FT1000D) user and service manual, modifications