Author Topic: Fy6800 vs Fy6900  (Read 18840 times)

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Online Adrian_Arg.

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Fy6800 vs Fy6900
« on: July 01, 2019, 10:16:57 pm »
Hi, I was able to get a question this is the same FY6800, with different shell and other numeracion. functionally they must be the same. [url] https://es.aliexpress.com/item/33034872134.html [/ url] |O
 

Offline windsmurf

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Re: Fy6800 vs Fy6900
« Reply #1 on: July 02, 2019, 02:15:08 am »
It looks like they upgraded the FY6800... specs look different, esp. 0-24Vpp...
- MagicPulse Technology,Low Jitter(RMS)<200ps
- Various Modulation: AM,FM,PM,ASK,FSK,PSK
- More Than 100 Waveforms: 8192 points * 14bits
- 0~24Vpp Amplitude Range,Min Resolution 1mV
 

Offline CDaniel

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Re: Fy6800 vs Fy6900
« Reply #2 on: July 02, 2019, 04:41:20 pm »
If you got the old version is not worth it , maybe if the jitter for square wave is indeed much smaller .
That stupid display mode with many leading zeros is the same ...
« Last Edit: July 02, 2019, 04:43:00 pm by CDaniel »
 

Offline Andbro

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Re: Fy6800 vs Fy6900
« Reply #3 on: July 02, 2019, 07:41:24 pm »
Hi,

What is the difference between the FY6900 sold by Kkmoon and the other sold by Feelelec? Who is Kkmoon?

Thanks
 

Offline windsmurf

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Re: Fy6800 vs Fy6900
« Reply #4 on: July 03, 2019, 12:37:47 am »
KKMoon just appears to be a reseller that rebrands other company's equipment.
FeelElec I think is the original manufacturer, also known as FeelTech.

 

Online Adrian_Arg.

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Re: Fy6800 vs Fy6900
« Reply #5 on: July 03, 2019, 01:33:22 am »
I had a fy6600, this one died, but for $ 100 I wanted to try the fy6900, I know that for that money you can not demand much.
 :-//
 

Offline Johnny B Good

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Re: Fy6800 vs Fy6900
« Reply #6 on: July 03, 2019, 03:01:46 am »
It looks like they upgraded the FY6800... specs look different, esp. 0-24Vpp...
- MagicPulse Technology,Low Jitter(RMS)<200ps
- Various Modulation: AM,FM,PM,ASK,FSK,PSK
- More Than 100 Waveforms: 8192 points * 14bits
- 0~24Vpp Amplitude Range,Min Resolution 1mV

 I'm afraid it's the other way round. It's actually a DOWNGRADE not only on the 6800 but also on the 6600 models >:(

 See my reply in the original FY6600 thread after I'd read through the manual for the FY6900

https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/msg2475843/#msg2475843

 I have a tendency to marathon postings but fear not, the above linked posting tells you all you need to know to save your pennies for better things (like an FY6600-60M for just 40 quid from Hong Kong!  ;) ).

 Seriously, you'd be better off imho, getting hold of the 6800 instead of the 6900 (but that 40 quid 6600 is such a bargain and the specification so identical to the 6800 it's hard to resist).  At that price, I couldn't resist buying myself a 'spare' but the one I ordered just on four weeks ago now is supposed to be arriving no later than today. I'll believe that when I see it. Fortunately, I'm not in any great hurry.

JBG

PS I only noticed this " MagicPulse Technology,Low Jitter(RMS)<200ps" you'd included in the feature list after posting my reply. It rather looks like you've conflated the specs of another make of DDS AWG since, after a long hard look at the FY6900 manual, I could find no mention of this feature at all which is rather odd considering that such a feature would put it in an entirely different league to that of its predecessors.
« Last Edit: July 03, 2019, 03:46:02 am by Johnny B Good »
 

Offline vinlove

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Re: Fy6800 vs Fy6900
« Reply #7 on: July 03, 2019, 06:57:45 am »
I got a KKMoon FY6800 for 59£ recently, and it is great.

Only problem was there was no manual with it, so I have been watching Youtube reviews on it.
I still need to find out how to use 50-60% of its capabilities.
 

Offline windsmurf

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Re: Fy6800 vs Fy6900
« Reply #8 on: July 03, 2019, 07:15:53 am »
It looks like they upgraded the FY6800... specs look different, esp. 0-24Vpp...
- MagicPulse Technology,Low Jitter(RMS)<200ps
- Various Modulation: AM,FM,PM,ASK,FSK,PSK
- More Than 100 Waveforms: 8192 points * 14bits
- 0~24Vpp Amplitude Range,Min Resolution 1mV

...
PS I only noticed this " MagicPulse Technology,Low Jitter(RMS)<200ps" you'd included in the feature list after posting my reply. It rather looks like you've conflated the specs of another make of DDS AWG since, after a long hard look at the FY6900 manual, I could find no mention of this feature at all which is rather odd considering that such a feature would put it in an entirely different league to that of its predecessors.

I don't recall where I got that, but similar info is here:
https://m.banggood.com/marketing-Multimeter-Signal-Generator--Oscilloscope-Promotion/tid-1801.html

 

Offline Johnny B Good

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Re: Fy6800 vs Fy6900
« Reply #9 on: July 03, 2019, 09:12:12 am »
It looks like they upgraded the FY6800... specs look different, esp. 0-24Vpp...
- MagicPulse Technology,Low Jitter(RMS)<200ps
- Various Modulation: AM,FM,PM,ASK,FSK,PSK
- More Than 100 Waveforms: 8192 points * 14bits
- 0~24Vpp Amplitude Range,Min Resolution 1mV

...
PS I only noticed this " MagicPulse Technology,Low Jitter(RMS)<200ps" you'd included in the feature list after posting my reply. It rather looks like you've conflated the specs of another make of DDS AWG since, after a long hard look at the FY6900 manual, I could find no mention of this feature at all which is rather odd considering that such a feature would put it in an entirely different league to that of its predecessors.

I don't recall where I got that, but similar info is here:
https://m.banggood.com/marketing-Multimeter-Signal-Generator--Oscilloscope-Promotion/tid-1801.html

 Thank you for that swift response. So, not your fault for that errata.  ;)  It's all down to Bangood playing fast and loose with the facts as usual. >:(

 Having solved that little mystery, there's nothing to change my opinion of Feeltech's latest version of the FY6600/6800 then.

[EDIT]   Out of curiosity, I checked out both manuals (V2.2 and 2.9) for the FY6600 and the one manual I have for the FY6800 and was surprised to see the same claim on output levels of 20Vpp max in the zero to 10MHz range with a 10Vpp max over the 10>20MHz range and a 5Vpp limit thereafter. This is contrary to the reality (at least as far as the sine wave option goes - I didn't bother checking the other wave forms) where no such 10Vpp limit exists. What you get with the sine wave option is a max of 20Vpp from 0Hz to 20MHz beyond which it drops straight down to 5Vpp (no 10Vpp limit for sine waves at least).

 Those limits, ISTR,  only apply to non-sinusoidal waveforms so it looks like an omission in all the user manuals regarding the extended 20Vpp frequency limit for sine wave output. I suspect the 6900 might follow the same pattern but the manual is no guide in this matter. As soon as anyone gets hold of a sample, this should be the first thing to check and report on since it would mean it's not quite the downgrade implied by the output figures published in the 6900's manual after all.

JBG
« Last Edit: July 03, 2019, 03:02:49 pm by Johnny B Good »
 

Offline Johnny B Good

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Re: Fy6800 vs Fy6900
« Reply #10 on: July 03, 2019, 11:28:16 am »
I got a KKMoon FY6800 for 59£ recently, and it is great.

Only problem was there was no manual with it, so I have been watching Youtube reviews on it.
I still need to find out how to use 50-60% of its capabilities.

 You can download the manual from here

http://en.feeltech.net/index.php?case=archive&act=list&catid=6

JBG
 

Online Adrian_Arg.

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Re: Fy6800 vs Fy6900
« Reply #11 on: July 03, 2019, 04:11:05 pm »
ok, then I'm going to go for a fy6800
 

Offline GreyWoolfe

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Re: Fy6800 vs Fy6900
« Reply #12 on: July 03, 2019, 04:56:11 pm »
I got a KKMoon FY6800 for 59£ recently, and it is great.

Only problem was there was no manual with it, so I have been watching Youtube reviews on it.
I still need to find out how to use 50-60% of its capabilities.

 You can download the manual from here

http://en.feeltech.net/index.php?case=archive&act=list&catid=6

JBG

Even though the folder says manual, it is actually the PC software.
"Heaven has been described as the place that once you get there all the dogs you ever loved run up to greet you."
 

Online Adrian_Arg.

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Online Electro Fan

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Re: Fy6800 vs Fy6900
« Reply #14 on: July 03, 2019, 06:22:57 pm »
I've read about a zillion pages on the FY6XXX.  Still not clear on the connectors on the back.  Any chance one of those connectors will accept a 10 MHz reference input signal?
 

Offline GreyWoolfe

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Offline tinhead

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Re: Fy6800 vs Fy6900
« Reply #16 on: July 03, 2019, 09:06:59 pm »
https://m.banggood.com/marketing-Multimeter-Signal-Generator--Oscilloscope-Promotion/tid-1801.html

fuck yeah! Just read this -> "Can choose our FYA2000S series or FPA1000 series power amplifier to output 20W~100W signal in DC-10MHz width without any distortion"

100W, 10MHz without ANY distortion, with an power app with 10kHz bandwidth, they made my day ...
I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.
 

Offline Johnny B Good

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Re: Fy6800 vs Fy6900
« Reply #17 on: July 03, 2019, 11:49:23 pm »
I've read about a zillion pages on the FY6XXX.  Still not clear on the connectors on the back.  Any chance one of those connectors will accept a 10 MHz reference input signal?

 No chance of that. They're all accounted for in the manual. However, don't let that stop you fitting another socket (BNC or an SMA-F) and following in Arthur Dent's footsteps, linked to below (or mine when I finally get round to adding an SMA-F socket to complement my version of Arthur's OCXO upgrade).  :)


https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/msg1346454/#msg1346454

 Since I chose to modify the existing PSU board (https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/msg2310768/#msg2310768) rather than replace it, I had to add the innards of a small 12v 300mA smpsu wallwart to power my own OCXO upgrade. This gave me the advantage over Arthur's setup in that I could wire this directly to the C6 mains socket I'd fitted to overcome the ESD risk posed to any DUT so I could turn the generator off on the rear panel switch and keep the OCXO running whilst the unit remained plugged into a live mains outlet.

 Using the the front panel "Standby" button only turns the display off by way of a power saving of circa 1 or 2 watts at most, leaving it to consume some 5 watts or so. The consumption of the OCXO once up to temperature is a mere 1.35W from the mains (the OCXO itself only consumes some 700mW naked or around 600mW when blanketed with quarter inch thick rubber foam - primarily to buffer it against random wind chill effects from the cooling fan).

 I'm planning on avoiding the issues of using a switch to select between the internal and external frequency references by using the "Injection Locking" technique whereby the external reference is used to couple remarkably little, yet more than ample, energy into the local OCXO to cause it to lock to the external reference automatically without the need for a change over switch.

  I've already proved that the 10MHz CQE OCXOs I'm using can be locked over a +/-10ppb range quite readily via their output pins which, since an error of as much as 1ppb can now be regarded as outrageously off frequency, is a more than ample lock in range (I've been able to trim to within 50ppt of my basic fledgling GPSDO[1] and see the OCXO in my FY6600 stay within +/- 70ppt for a week or more making long term calibration to within 0.5ppb a realistic goal).

[1] I've been experimenting with GPS modules for several months now and only recently acquired a collection of OCXOs to develop the original raw 10MHz PPS output calibration standard into a proper, if rather basic[2], GPSDO. Currently I have it assembled onto a prototyping board which I've been tinkering with for more weeks than was strictly necessary.

 I finally shut it, the 'scope and the FY6600 down just a few days ago to get used to the idea of not being able to glance at the 'scope trace evidence of my successes with the FY6600 OCXO mod and the GPSDO project by well of self admiration at getting so close to boxing off my first homebrewed GPSDO project. It seems I'm finally ready to take that boxing off step since, surprisingly, I didn't feel any obvious symptoms of "Going Cold Turkey".  8)

 I guess the knowledge that the only way forward now to get away from the susceptibility to "Theremin Effect" induced phase shifts and other prototyping board layout induced instabilities, is to actually commit it all to a PCB fitted into a nice metal enclosure to shield it from external environmental influences.

 Once I've sorted out the GPSDO, I'll be able to turn my attention back to the task of fitting an SMA-F external reference socket and injection locking circuitry into the FY6600. I'll take a bunch of photos to make a "Show and Tell" post in the FY6600 thread when I've completed this (final???) modification. It'll probably take me a few weeks to get to this stage so don't wait for this with bated breath.

[2] Basic in the sense that I'm just using a two pole RC LPF on the phase detector output which, whilst sufficient to suppress the jitter on frequencies that are derived using non-integer divide ratios of the 48MHz clock and deal with the sawtooth adjustments, does not have the long term averaging effect of a micro-controller filtering algorithm to filter out the basic GPS navigation system shortcomings in handling ionospheric variations which reflect as nanoseconds worth of phase shift (typically as much as +/-15ns over periods of 30 to 300 seconds and beyond) on the PPS signal (100KHz setting in the U-blox M8N (fake) module I'm currently using to phase lock my 10MHz OCXO to).

 Whilst these phase variations don't fatally detract from the process of confirming that a free running OCXO or Rubidium clock is already within a few PPT of nominal, trying to make recalibration adjustments otoh, becomes rather a matter of 'dumb luck'  and persistence when it comes to any attempt at trimming an OCXO to within 50ppt of frequency. :(

JBG
« Last Edit: July 06, 2019, 08:07:11 pm by Johnny B Good »
 
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Offline Rx7man

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Re: Fy6800 vs Fy6900
« Reply #18 on: July 06, 2019, 08:16:02 pm »
If you got the old version is not worth it , maybe if the jitter for square wave is indeed much smaller .
That stupid display mode with many leading zeros is the same ...
I wish they'd change it so rather than displaying kHz when under 1khz it would just display Hz, likewise for Mhz when in that range
 

Online Adrian_Arg.

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Re: Fy6800 vs Fy6900
« Reply #19 on: July 09, 2019, 06:55:18 pm »
One more question, Feeltech, Feelec and KKmoon are all the same instruments, just change the name? :popcorn:
 

Online radiolistener

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Re: Fy6800 vs Fy6900
« Reply #20 on: July 10, 2019, 04:22:53 am »
- MagicPulse Technology,Low Jitter(RMS)<200ps

not so much in comparison with 2 ns jitter in the previous version.
Do they planning update with jitter improvement for older models?
 

Offline pantelei4

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Re: Fy6800 vs Fy6900
« Reply #21 on: July 10, 2019, 04:09:13 pm »
not so much in comparison with 2 ns jitter in the previous version.
Hi. In the previous version, one clock jitter 4ns.
« Last Edit: July 10, 2019, 04:10:47 pm by pantelei4 »
 

Offline MM0SDK

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Re: Fy6800 vs Fy6900
« Reply #22 on: July 11, 2019, 01:34:44 am »
Hi folks, my first post here. Has anyone got their hands on the latest model yet for test? Was going to order a FY6600 or FY6800, but if there are going to be any improvements with the 6900 aside from a different enclosure, I may wait.
 

Online radiolistener

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Re: Fy6800 vs Fy6900
« Reply #23 on: July 11, 2019, 02:46:25 am »
Hi. In the previous version, one clock jitter 4ns.

OMG. By the way, this is peak jitter, so in average, RMS jitter will be a little smaller  ;D
« Last Edit: July 11, 2019, 02:48:04 am by radiolistener »
 

Offline bdunham7

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Re: Fy6800 vs Fy6900
« Reply #24 on: July 11, 2019, 09:35:16 pm »
 If it hasn't already been said, the 4ns "jitter" is just the natural result of a 250 MSa/s fixed clock DDS putting out a square wave with a period that is not a multiple of 4ns.  Sine waves don't have this jitter, so if you need a clock, try a sine wave. 

Does anyone actually have an FY6900 in hand yet? I seriously doubt they've added variable clock or "Magic Pulse" as that would be a major revision and upgrade.
 


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