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Check the post again. Raw video file added.

Heat is always a factor on smaller chassis radios like these. However, failures of the original AT-6666 due to heat are not common despite the "it gets hot" comments you see (they can handle the heat!). FYI, here is a nice aftermarket fan kit (video from facebook):

I repaired and aligned these ones recently. I got them for a steal, because they had been attacked with the golden screwdriver from hell (broken and completely missing slugs, the works!). Whoever did this must have taken them out of the box, watched an "all the way" video and then proceeded to...

I agree Mike. TX can be made to look good, but the frequency instability is a big problem on SSB TX too. At least it was on the few I have had here. - I'll also add one to the list: that awful starlite faceplate inverter noise (model dependant).

I have signed up. Cheers guys!

I got mine from The official Zeenko store on AliExpress. (They are the manufacturer of the genuine units). That was cheapest for me, but I'm in AU so that might not be the case for you. No matter where you get your genuine version from, grab some SMA attenuators for it. They are necessary for...

In my unit I found it was the frequency that changed, not the depth. (I could get the meter to calibrate to the far left, but not at the required 1KHz (mine went high by around 20Hz from memory). However, depending on how much each capacitor in the matched pair drifts, and in what direction...

I have a prototype and I can confirm it.

I can confirm, just as LC has said, a few Hz +/- either way on your generator WILL impact your calibration and your SINAD measurements. FYI, I use a GPSDO for my 10MHz ref standard. Relatively cheap, and extremely easy to setup (plug and play). 73

I just skimmed through the video, but it looks like his notch filter caps are bad. That's why at the end of his video, the meter won't adjust to the far left. You need 2 things to calibrate these Sinadders properly: 1 - A very accurate tone (signal) generator, capable of 1KHz and 2KHz sinwave...

There is alignment information available that is not hard to follow. It is important to align them because there are 2 x capacitors that are used for the 1KHz notch filter, which can move in tolerance over time. Usually, they can be aligned back to where they need to be with the on-board...

The point of my post was: You can do this on the new AT-6666 PRO without needing the Signalink, or any third party controller. Which is cool! 73

There is a python controller available apparently. (That might satisfy your need for some Linux pain lol). Seriously, I respect anyone who can run Linux full-time. It's a skill I cant master. I use Linux for radio projects and pi based servers, but for every day use would make my head explode...

Ha! That's awesome, I didn't know that.

For what you are doing, I would go with either a genuine a Sinadder (if you can find one), or the the Sinadalizer from the UK, which is pretty much a clone of that circuit. I have an original Sinadder 3 here, and I prefer to use it over the built in Sinad measurement in my Marconi and HP test...

Hi Mike, In regards to a Lincoln II+, I agree. The frequency stability of the AT-6666PRO is extremely good. It is no challenge for most digital modes, at all. I am doing it. It is actually much closer to the stability of an IC-7300 than to any of the other radios that have been in this lower...

I am 100% sure. This is the new "PRO" model. It is totally new inside, and is not the original AT-6666 that you are referring too. It will be released in July. FYI, CAT control is not needed for many digital modes. Most (like WSJT-X, JS8Call and most RTTY/SSTV software) support a VOX mode too...

Just to be clear, the AT-6666PRO I refer to needs no mods at all for this to work. Just a cable. And it covers 15m/12m/10m in a similar price range to the LII+ that @opale7000 is considering. The 7300 is a great rig, but it is a significant price jump. That might, or might not be a factor here. 73

Welcome to the hobby! The Signalink device manages the PTT control internally (it has its own VOX), so you don't need VOX in the radio for it to function correctly. For a "single" mic-jack cable connection to the radio, you need RX Audio available on the mic socket for this to work. Otherwise...

Very close! Production is scheduled for early July.