So, what I did was the following: • I gave a very deep read to the Tech manual and schematics. • I opened the unit, and with the Tech manual, identify all the signals I am interested in: • Display unit 5 wires (Int, K1, K2, K3, K4) • PO FWD (J27.3) • PO REV (J27.1) • ALC (bridge near Q54) (or outside via RCA, but I have this one in use by the ATT) • AGC (J35.5) (Or outside at the remote connector, but I didn't notice this first) • IF Width (I intercepted this one) • IF Shift (I intercepted this one) • CAT Remote connector (back, 3 wires remote connector) • All these can be easily tapped at the connectors, so no PCB soldering was needed. • All these signals were taken outside with CAT5 wires. The digital signals were shielded, just in case Decoding the signals • With the display control lines plugged to a scope, and afterwars the PC via LPT, and using software, I started taking samples and writing everything on a TXT file.

• With that on hand I easily decoded all the information of the display, so now I am able to read the information back into the PC. • The control signals are basically 13 nibbles of 4 bytes, BCD encoded: • The first 4 nibbles seem to be a fixed preamble 0A FF • The next nibble is for VFO-A / VFO-B / MR • The next nibble is for Clarifier / Split / Lock • The next 6 nibbles are the main digits • The final nibble is for the Channel memories. Using SPI has a problem with the PIC, an it is that the SDO pin is shared with the RX pin of the UART. In short, even if you don't use the UART to receive data and just to send (which was my case), anyway that pins gets reserved by the UART, thus unavailable for the SPI. I solved this by just disabling the UART and enabling the SPI every time I had to use the SPI.

And after that, enabling again the UART. It is not the best solution and you completely loose the capabilities of the RX, but anyway it served my purpuses and as not a big deal in my case. The copper plane of the board. Note that it has suffered quite several important changes after I designed it, to solve different problems that I initially didn't take into consideration. That is the reason I haven't placed the schematics, these changes were not yet updated in the files. Update 2009-05-25 - Simplified version I know.

So far I haven't posted yet schematics, PCB, or firmware. The reason is that I modified quite some stuff after the PCB was done because there were some design errors at first (and I never updated the schematics or PCB), and another reason is that the DAC I used, was obsolete and sucks.

The Yaesu FT-757GX is an affordable HF transceiver covering 160 to 10 meters and has ten memories. The general coverage receiver tunes from 500 kHz to 30 MHz. Warhammer 40000 Dawn Of War Full Version there.

So I should really redo the design and adapt the firmware to keep all the analog capabilities. However, a few hams have emailed me requesting for information, and after all.

All what they wanted was the digital control capabilities, not the analog stuff, so I made a smaller, simplified version, with PCB and FW, that should be working. It has been built and tested by others, so we now know it DOES work;) The files are here: Also another possible project would be to entirely replace the rig CPU with a new one, and program the CPU control like directly in my firmware. However I still don't have the guts to make the replacement, also pin count and available space are real problems. Perhaps one day I will have the guts to do that.

Last Updated on Wednesday, 13 August 2014 22:46. Tradeguider 4 Eod Er more.

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