Products > Test Equipment
FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
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vince53:
I was fortunate to be able to retire a few years ago and one of the first missions was to set up a basic electronics bench for playing with radio control planes and amateur radio.  It didn't take long before I missed the resources and expertise I had enjoyed for decades, test equipment, metrology lab, machine and sheet metal shop.  One purchase was an old 5MHz function/ sweep generator.

I used it to align some AM radios but now I wanted to align the 10.7MHz IF sections.

So I recently purchased an FY6800.  After verifying it worked I ordered an assortment of upgrade parts.  I installed a linear 15vdc supply, installed new op amps and replaced the encoder so I could have a larger knob.  Next was to figure out how to get a repeatable setup for FM IF sweeps and contribute to the thread.

I'm testing and hear a high pitched squeal.  The LM337T failed and blew out one of the new op amps.  I reinstalled the original op amp .  Currently running off a bench supply with the board sitting an a cardboard box.

It appears to work like new.  So I'm back to playing with the sweep.  For now, it's not raining so outside I go.

It's been a pleasure to read all of this thread.  KC8AAC
bdunham7:

--- Quote from: Johnny B Good on June 11, 2019, 04:53:03 pm ---
 Anyhow, regarding your mention of those forty dollar FY6600s on Ebay, I was intrigued enough to investigate what was on offer for myself. I did check out the prices on the FY6800s btw, before placing an order just half an hour ago on a FY6600-60M from Hong Kong for a mere £40.41p (just over half of the £75.66p I'd paid for my now much modded unit some seven months ago).

 I didn't fancy paying a 30 quid premium just to get a slightly nicer revamped front panel and a big butch switched C14 socket on what is essentially still an FY6600 inside. Besides which, it's a case of "Better the Devil you know." and it makes for a very cheap "Spare". The only concern with these "last available FY6600s" being whether they're unsold stock of all those models which had been afflicted by the version 3.0 firmware bug. :-\ Hopefully not but I should be able to determine that in some two to three week's time.  ;)

JBG

--- End quote ---

I agree that it looks like the original FY6600 with the latest firmware is the best option at this point--unless a teardown of the FY6900 reveals a new level of excellence.  I actually ordered two with the cheapest-option AU plug since I plan on converting them to  US/C5-C6 and adding a 10K resistor to the existing Y-cap and running it to ground.  Then I'll see how it works and if my EMI and noise is acceptable.  I have a use case for two--or three--using either the sync feature or using one to control the other thru the VCO port.  I paid a total of US$84.86 for two, shipped, so I can't imagine a better deal.  I can live with the output limitations--20Vp-p at 20MHz (let alone 60) is pretty hard to do with an inexpensive op amp.  And this thing has two channels!  I'd like to see a comparison with more expensive DDS AWG models--I've seen some at over 10X the price that don't seem to do as well as the lowly (and now dirt cheap) FY6600. If I need more power I'll get or make an amplifier.
bdunham7:

--- Quote from: vince53 on June 11, 2019, 07:18:52 pm ---
I used it to align some AM radios but now I wanted to align the 10.7MHz IF sections.

So I recently purchased an FY6800.  After verifying it worked I ordered an assortment of upgrade parts.  I installed a linear 15vdc supply, installed new op amps and replaced the encoder so I could have a larger knob.  Next was to figure out how to get a repeatable setup for FM IF sweeps and contribute to the thread.


--- End quote ---

I also want to repair/restore/adjust/align/fiddle with some FM receivers.  I'd be interested how you make out.  Is it necessary to have such high outputs that new power supplies, op-amps, etc are needed? 
Also, I'm trying to synthesize a usable FM multiplex stereo test signal.  I have an RF signal generator with an FM function, but the multiplex signal is complex and I'm still trying to figure out the best way to do it.  Any ideas?
Johnny B Good:

--- Quote from: vince53 on June 11, 2019, 07:18:52 pm ---
====snip====

So I recently purchased an FY6800.  After verifying it worked I ordered an assortment of upgrade parts.  I installed a linear 15vdc supply, installed new op amps and replaced the encoder so I could have a larger knob.  Next was to figure out how to get a repeatable setup for FM IF sweeps and contribute to the thread.

I'm testing and hear a high pitched squeal.  The LM337T failed and blew out one of the new op amps.  I reinstalled the original op amp .  Currently running off a bench supply with the board sitting an a cardboard box.

It appears to work like new.  So I'm back to playing with the sweep.  For now, it's not raining so outside I go.

It's been a pleasure to read all of this thread.  KC8AAC

--- End quote ---

 I'm sorry to hear of your misfortune with the blown supply and one deceased opamp. Those analogue regulators are supposed to have over-current/temperature protection to prevent such disasters. Did you install a cooling fan btw. Most (possibly all) of the previous PSU modders took the precaution of fitting a fan once they realised just how hot these generators were getting even before having the extra thermal loading from an analogue PSU upgrade imposed upon them.

 Indeed, I'll be fitting a 50mm cooling fan to my 40 quid prize once I've allowed a few months of "hard use" to prove it isn't harbouring any "Infant Mortality" failure mechanisms. I don't want to risk invalidating the warranty or the Ebay money back guarantee too soon like I did with the first one. A cooling fan mod should take priority over any other mods you might be contemplating imo.

JBG
Andbro:
Hi,

If the 6600 to 6900 are not good. Do you have any suggestions???

Thanks
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