Products > Test Equipment
FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
gamerpaddy:
just to note,
the pc software asks the device for its firmware by sending
--- Code: ---UVE\n
--- End code ---
, the device responds with for example
--- Code: ---v1.7\n\n
--- End code ---
the firmware downloaded by the pc software is this:
fy6800:
http://feeltech.net/software/updata/FY6800/download.php?vison=DDS&name=FY6800-DDS.FYbi
fy6600:
http://feeltech.net/software/updata/FY6600/download.php?vison=DDS&name=FY6600-DDS.FYbi
not sure how its converted / flashed. forgot to run my logicanalyzer when updating my unit. gotta figure out how to trick the firmware check that theres a newer version.
it also doesnt contain the typical \x00 \x50 \x00 \x20 header i find in all stm32f103 .bin's maybe its decrypted.
Yansi:
That is NOT a header. If you have a direct binary image file of any ARM Cortex M processor, the first 32bit word is the address where SP (stack pointer) should be place. Second 32b word is where the reset vector is located.
There is nothing "typical" other than SP is typically in internal SRAM, which begins at 0x20000000. So your byte quartet is indeed a SRAM address of 0x20005000 - which kind of makes sense. (Remember that Cortex M is little endian).
(Which also by the way, is a pointer to the END of SRAM in STM32F103, where there is 20kB (0x5000) of SRAM).
Johnny B Good:
To Noy: You need to adjust by a millivolt at a time. I can't recall whether the relay switches the attenuator in and out between the 499 and 500mV mark or between the 500 and 501 mV mark. However, you should hear the relay click (you might need to disable the beep in order to hear the relay).
When driving a high impedance load, the change in level should be just about what you'd expect. If this attenuator network hasn't been corrected from its 85 ohm form in the FY6600 to a proper 50 ohm one in the FY6800, you'll see a much greater change at the relay switching point when driving a 50 ohm load.
HTH
JBG
Johnny B Good:
--- Quote from: Gege34 on January 31, 2019, 08:44:17 am ---Johnny B Good thank you very much for this great description to improve the FY6800 :-+.
I have the FY6800 from KMoon (firmware 1.7.1 but reported as 1.7 with the PC software).
1. Could you please make a picture of the internal modded device to see were you put the fan and the TCXO.
2. About the power supply upgrade, to summarize, what is the easiest way to improve the original one?
4. About the TCXO how to properly connect it (cable to use, ...) to the main board?
I have found the 50MHz version here (several of available).
Thank you
--- End quote ---
Sorry about the delay in responding. I had hoped to get the chance to take some photos to post here rather than having to say, as I now am, that I'll post some up as soon as I get another chance to open it up. Right now, I'm rather preoccupied with a little DIY GPSDO project to let me more accurately and swiftly calibrate the 50MHz 0.1ppm TXCO upgrade. As soon as I get the chance, I'll be only too happy to post the photos here and do a little showing off. :)
JBG
Noy:
So tested it:
Amplitude 500mV with no DC offset -> 528mV and 100mV DC Offset Into high impedance.
1mV change (501mV) at the generator (relay clicked) caused 512mV and 84mV DC Offset Into high impedance.
Same with 50Ohm Input:
500mV -> 200mV and 44mV DC Offset.
501mV -> 256mV and 44mV DC Offset.
And why is there a 100uV Digit? 😂
20mV DC Offset with Output Off Into 50Ohm 50mV Into high impedance...
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