The linked GitHub on there has gone dead, but this is the PCB design mentioned for that setup on PCBWay - PCB for TEF6686 and TEF-GTK - Share Project - PCBWay
I had one of these myself until recently that I got second hand, and it did work very well for webserver.
Having a few more hours of experience with this radio (with one day with an alternative antenna that seemingly just filtered out the AM noise, but the audio level just lowered as well).
Iād say that if you want a cheap and very portable TEF radio for home/outside use (or want to just dip your toes in before committing to something more expensive) than this is the radio for you. If you want a TEF chip because youāre on the go and want that sensitivity that a car radio can give, then give this a miss. I was trying to listen to the cricket on ABC today and found that both 702 and 97.3 werenāt exactly clear to listen to (and both seemingly pushed the mid/treble limits of the speaker to be heard on a bus without forcing my passengers to listen to it). Some of the radio settings donāt seem to do anything (such as AGC threshold limits). Speaking of AGC, no option to manually adjust gain. AM noise seems to only be fixed by holding the base of the antenna (suggesting a grounding issue?).
No RDS, just bars for apparent signal and multipath meters.
Ther may be a simple answer to this problem but I am yet to finbd it
Usingg my Ipad or mobile devicwe I can see the Audio tracking or spectrum Analyser plugin
on screen on most Webservers. I have no issue manipulating .
If I use a Desctop PC I can not see or activate those plugins with the area in the GUI blank.
I have tested Edge Chrome and Firefox with no success. I assume this is a Java issue but I am not smart enough to figure it out.
Any ideas or assistance apreciated.
Only thing I can think is that an extension is blocking the requests, are these being ran without any as a test?
OK, Iāve read this thread, which is the best one to get?
My take.
Recption performance is pretty much the same across all models.
The silver/grey rectangular ones are cheaper ($100 ish), but build quality and sound quality are inferior to the more expensive blue/square ones ($200 ish).
And firmware is harder to update on the cheaper ones too (need to use the boot button inside the radio).
This model is the latest favourite on the TEF groups
Yeah, Iād be looking for one I can take around. Those blue/square ones donāt seem to be very portable to me.
Theyāre portable, theyāre just not exactly a fashion statement. Then again, none of them really are, if you were to walk around with a 75cm antenna sticking out.
Basically, this will replace the one I take to the footy (the one I use to listen to SportsEars frequencies), but I also want to screw around a bit with DXing at times. The DP-666 looks alright.
I personally have had a bad experience with my DP-666. The speaker didnāt work out of the box and the screen got permanent burn-in after using it for an hour. Also the antenna plug became temperamental after only a week of use and only makes a good connection 50% of the time. Ali express also refused to help or give me a refund for any of the issues.
Which one of these would be recommended. Again, reasonable amounts of portability is a must. Itās not being connected to a webserver, this is something for me to piss about with and take to the footy.
I have the blue one, and Iām very happy with it.
For me, it is worth the extra money for better sound quality and that it is easier to update the software on it.
So if you have the $$$, go for that one. There is an LNA version that is extra cost again, but the verdict seems to be that itās not worth it (mine doesnāt have that).
Iām a happy silver 6686 user, but most of the time mine operates as a web server. If thatās the primary usage, a headless board might be a better fit.
My only complaints with the silver radio when used portably is the absolute crap telescopic aerial, itās always losing ground and even when tightened up, flops around. The sound isnāt too bad at least when compared to a mobile phone, but still isnāt flash.
OK, letās say I had the $$$ for that one. Where can I go to spend that $$$?
Non LNA version
This seems to be a common issue across all models, Iāve replaced both mine with F type connectors.
Yeah I think I made comment earlier I use F type connectors too, with my TEF as they are stronger than many of the stock SMA whips.
The swivelling telescopic antenna issue annoyed me to the point of action a couple of weeks ago & Iāve now modified a 1.4m telescopic whip with some Selleys Metal āKnead-Itā (I had lying around) neatly around the swivel part of the antenna to stop the whip antenna flopping around.
Now I just rotate the whole radio about for optimum reception during DX.
I use a 1.4m whip (sold as a 1.2m on AliExpress) with F connector plus a SMA to F adapter.
The whip antenna is a bit too long for FM DX, but far better than a 75cm length antenna. A 1 or 1.2meter length whip would be better re a compromise between weight & strain on TEF antenna connector & reception for FM BCB.
The solution is not ideal, but itās saving my sanity for the moment 
Whatās LNA and what sort of difference would that make?
Donāt bother with LNA version.
From all reports (IIUC) youāre just paying for a switch-in attenuator by retail sellers for the price
rather than a switch-in LNA (low noise amplifier) 
