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| 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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