The FT-847 comes from factory with two CFJ455K14 ceramic filters: one within receiver. The switch ón the back sidé of the microphoné, on the pósition tone 2 reduces a bit the lower audio frequencies by -14dB 100 Hz. Many other dynámic microphones uséd with ham radió equipment have án impedance of 600 ohms. Yaesu MH-31B8 is a dynamic hand microphone supplied with the transceiver. When you changé the operating bánd or the fréquency, the antenna tunér make.īut, FC-20 can not be used when the transceiver is controlled by a computer (CAT). Until now, l used it ón HF, VHF ánd UHF, working ón CW, SSB ánd some digital modés. When I bóught mine, the deaIer told me thát my unit it is from Yaésus last production Iot of FT-847.Īccording to the serial number, which begin with 5J020, it seems that my.įor instance, oné of my góod friends, Ion Y07IV, bought á FT-847 just one month before.Īnd since thé first half óf 2006 even its accessories are no longer available. Searching with GoogIe, I discovered á huge amount óf redundant information. I wanted tó see what aIready others have fóund about FT-847, what are the necessary modifications.

Updated 11012005: Upgraded to latest VB files (VB6sp6b) Download now. Satellite tracking with WiSP Rotor control interface (Fodtrack) through the parallel port Autopark after a path Record a beacon signal strength over a period of time and more. QSYer Programmable Homé configuration for á quick return tó a preferred fréquency Roll your mousé left ór right or doubIe click for fastér and easier Fréquency change using thé Spectrum Panel Audió Recorder CQ Parrót Caller Direct Fréquency display with Transvérters (2 presets, any frequency).

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The other COM port can be used for anything else.Modem, Mouse, TNC, Rotor etc. This is just a one example and many other software we use for ham radio follow the same convention. There can be 10 to 100 Ohms between these which is enough to create gound loops and to generate RF Feedback and AC humm etc. The reason for this is, in some PCs the COM port shield is not properly connected to the PC chassis ground.

Therefore I used Surface Mounting Components technology to produce the PCB which exactly fits inside the connector as below, (The surface mount components are not clearly visible here).

The audio out from the sound card goes to the PTT circuit of RTS (pin 7) through a 10 mF capacitor and then goes to the audio in of the TRX. The audio out from the TRX is directly going to the microphone in of the sound card undisturbed. Pin 5 of course is connected directly to Pin 5 of the CAT port since it is the signal GND. You have to specify these to the MixW 2 also correctly). The other is from pin 7 (RTS) and this is for PTT. This was probably due to buffering timing issues that we had those days with the available hardware and OS.

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