Ft857d Ceramic Filters Not Output Power

Further deterioration causes eventually no rf output on most of the hf bands in ssb. Looking online it seems the filters for the ft 857d are getting harder to find. It came a few days later and sat on my desk for a couple days.

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The output tip and sleeve are wired to a 3 5mm jack plug which is inserted into the alc input socket on the ft857d.

Ft857d ceramic filters not output power.

Then i heat each remaining filters legs with a soldering iron and pull the. I then take the ceramics inserts away. In addition to the natural output capacitance of the power supply you might add a series inductor and another filter capacitor to further reduce output noise fig. Not even enough power to indicate properly on its own meter or external meters.

The radio has two slots for optional filters. The inductor passes dc. In that rig the schematic shows that the diode dc switching voltage is applied to the toko am ceramic filter although the toko data sheet says that a dc blocking capacitor should be used. Even at full output power.

Ion preparation for that i decided to get the 500hz cw filter to add to my ft 857d. As the filters deteriorate it creates noise even without antennas. Receive more signal when the same noise less crosstalk have better selectivity cut out signals sent in other frequencies than right one for present channel. I found one on inrad s web site and ordered one.

This happened to my ft857d. Am ceramic filters kit for yaesu ft857 ft897 after replace for filter high class radio can. My 857d was purchesed in jan 2008 and had the noise problem for about 24 months and last month no rf output on hf. Using a 9 volt alkaline battery is not a good choice as the maximum voltage required is only 4 volts.

The yaesu ft 857d is the worlds s smallest hf vhf uhf multimode amateur transceiver. The problem is not the filter it s that the rig design overlooked the need to avoid applying dc voltage to the filter. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. To take the filters apart i use a plier to open the filter.

The 1 5 k ohm series resistor avoids shorting the battery out when inserting the jack plug into the transceiver. It is the sucessor to the earlier ft 857 but the new d version adds the 60 meter ham band and includes the formerly optional dsp 2 digital signal processing unit the ft 857d is loaded with features high power output and a receiver that blends the renowned performance of the ft 897d and ft 1000 mark v. Being saturday and. As eb5agv wrote in his blog there s for some time now a true ceramic filter pandemic worse than the h1n1 at least for amateur radio.