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FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
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rhb:
I discovered that by generating a 2 kHz ramp on CH2 and feeding that to the VCO input on the back I can get a quasi-stable sweep by triggering off the ramp.  However, there is a *lot* of jitter in the FY6600 sweep relative to the ramp.

Here are the ramps produced by the 33622A and the FY6600.



Next the sweep using the ramp input to the VCO input on the back of the FY6600.  The 33622A is the down ramp.



Same thing but using the ramp from the 33622A



The jaggies and banding are aliasing effects.

It may be that I can make some useful measurements of the F***Tech output using the nanoVNA.  I've never tried to measure the output impedance of an amplifier, so significant research needed.  But it certainly appears as if there is a shunt capacitance across the output.
aimc:
Hmmm interesting, but now the drop is even deeper from the looks of it...??? Maybe the VCO mode has a different can of worms. Also 2KHz seems a bit fast for a sweep. Maybe the VCO can't handle it and/or it can but then the waveforms gets distorted within a single sine period depending on frequency? Haven't done the math on that... I know if you do it slower, the scope's sampling rate drops and you get aliasing, but as I said before the peak values of the aliases remain the same.
CDaniel:
I suggest checking Feeltech linearity manually in 100KHz increments or how do you want , only with the generator connected to the scope .
For 0-60MHz linearity , the probe proper compensation is very important , not just that basic visual 1KHz sqarewave no overshoot , undershoot procedure . Unfortunatly a scope and probe is not that linear as we would want , it is not a RF voltmeter . A judgement could be made only if you have another generator you are certain that is linear .
soundtec:
I noticed I needed a version of the original Feeltech software installed on the machine before Fremens would run  ,I had been trying out the latest FY6900 version pc software ,maybe this caused the issues I am seeing , I wonder is there a particular version of the Feeltech pc  software I should be using for maximum compatibillity to Fremen's FP code ,

I also saw the software Yves created for his Fy3224s ,theres several features  that looks very usefull , both to the radio enthusiast which its designed for ,but also would be very helpful for programming test tones or sweeps for audio or any other test purpose that comes to mind . The programable buttons to trigger arb waveforms from memory could almost turn the unit into the equivalent of a sampler ,might be of use to those who are looking to incorporate an arb gen in a musical context .

I tried a trial version of Ni labview to display the .VI file included with some of the Feeltech software packages , seems to make an attempt to copy the controls of the unit on screen but the  labels are garbled charachters ,there appears to be a control element missing from the Feeltech VI file as well.

I did also see RHB's post about the Fy6600 WSPR transmitter , the author of the article did create a basic VB code for control of the FY6600, so thats another thing Id like to try out.

I did have another think about the double button press being required  to select channel and mute/unmute  , maybe a nice idea would be when you initially depress the channel 1 or 2 button  have it select that channel to top if its not there already ,then let the unlatching of the button send the command to mute or unmute as required , now only a single press (and release) covers both functions , it  only logical  captain  Fremen >:D   


Many thanks for all the efforts .


 
Miti:
Can anybody post a csv file that is accepted by FT software, or fremen's software? I can't figure out the format. I'm trying to do a simple ASK modulation on CH1 from CH2 and anything I try will just return an error message and shut down the program.

Thanks,
Miti
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