Looking at the data for the fmdx.pl maps/server transmitter ID again just now. It seems like there’s actually the “site ID” field in both the ACMA data and at the end of the transmitter site links in the RDS spreadsheet. Together with frequency that should give me a unique reference, so that may be a way of automating the linking of the data in a new sheet. I will make a copy for testing purposes.
Just need to figure out how to get the ID from the parsed URL…
Wow! So how do we (host & end user) get the data to end user’s RDSSPY exactly?
Is there an instructional video about?
I can see you’re using V1.2.6a
I get this message after putting rdsspy at end of the server address. Please connect using a WebSocket compatible app to obtain RDS stream.
I’m lost after that.
UPDATE: Looking at the Discord website, appears output to RDSSPY it is still in development/testing stage, with some folk far more skilled in PC tech & programming than I getting an output to RDSSpy. We should hear more about this soon I guess.
Automating the RDS data collection for the transmitter ID in FM-DX Webserver is an ongoing job, but in the meantime I’ve had a look through the servers and tried to update the data where there’s missing or outdated entries. Updated a few received on the Melbourne, Sydney, Perth and Sunshine Coast receivers (including adding the RDS for the two new Noosa services mentioned further up).
A question, the TEF has 3 different options for displaying signal strength
dBm
dBf
dBuv
dBuv seems to be the default on the blue TEF (which is what i have / use), but I notice from screenshots some users like dBm. Just wondered what the industry uses for measuring signal strength?
Depends exactly what you want to know & why, but pretty much only either dBm or dBuV & one is a Wattage measurement & the other is a Voltage measurement.
Industry mostly uses both those I mentioned, dBm will normally be a minus number & the closer you get to 0dBm will be a stronger signal, so often if you see a signal strength figure quoted just as dB & it’s a minus figure then you can generally assume it’s dBm.
For receiving on the TEF, personally I’d be using dBuV as that’s what most “default” settings on a FM or DTV signal strength meter will use & what’s mostly used in the industry for a field signal strength level.
For FM Radio, a good indoor signal strength you’re looking for about 66dBuV/m & above, or around 54dBuV/m for outdoor reception, car radio reception can usually have good reception of a much lower signal strength down around 43dBuV/m for a Stereo or 33dBuV/m for a Mono.
I have seen some of you have got reception on your TEF in the 20dBuV range, that’s an extremely good pickup on a low strength signal.
For DTV the recommended RX signal strength is between 60 - 70dBuV with a maximum of 75dBuV.
dBuV & dBm are more or less interchangeable through a calculation but both results are dependant on the system impedance in the calculation, broadcast transmit uses 50 Ohms, receive systems are usually 75 Ohms, the TEF will know what to use when it does the internal calculations, but if you’re manually doing conversions, you’ll need to know what impedance the antenna system is using to get the correct result.
Finally managed to get RDS Spy working with two Australian based TEF servers.
My thanks to @tvcl for some much valued assistance & posts, the rest I nutted out.
I’ve updated some Perth based entries in the Australian RDS List.
Several nerdy observances re RDS changes for Sonshine 98.5
In those cases, I’d more likely say the TEF signal strength meters are not very accurate, & maybe the lower the signal strength the less accurate it gets?
10dBuV is a very weak signal, yes the TEF chip is very good, & a slightly older version has been used in some car radios in the past, inc. a couple of Pioneer Super Tuner models I think, but I doubt they’re that good they can decode & play such a weak signal strength in the FM band?
I’m sure I’ve read somewhere also that they don’t measure/compare the C/N ratio correctly, but can’t remember why or what was incorrect.
It’s hard to hear just how good & clear that audio is in the video, & being Tassie into Bungendore the signal really could be that weak, but if it decoded at all (being an SDR chip not an old style electronic component tuner), I’d expect it to be very hissy & have a lot of background noise, which that C/N doesn’t indicate it does?
Also even being in that “paddock” I’d expect the background noise floor wouldn’t be insignificant & especially if the electricity on that pole & kiosk sub-station not far away is live.
What would be interesting which is hard with the lack of clear free frequencies, would be to go to that site or one similar, tune to a clear free frequency & see what the TEF signal strength meter registered as background noise floor levels?
Just arrived home. Yes having that feature will save me having to bother some folk & make it easier for me to do some RDS List updates. Think it will also save the webserver GUI programmer some GUI design & other such future RDS feature programming work too
I’m considering getting another TEF for my new antenna. What’s the verdict on the blue version with the LNA (~$200) versus silver one (~$100)? How much does the LNA help? Is it worth the extra $100?
From what I’ve read on this forum, the main advantage of the blue one is better sound. Reception is much the same as the silver one.
The build quality is probably better too, there have been reports of flimsy antenna ports on the silver ones I believe?
Apparently, LNA does help with weaker stations, but will cause overload on stronger stations, which I imagine will mean switching it on and off frequently when doing a bandscan.
I have the blue one, the other advantage I find in portable DXing is that you can operate it one handed, leaving the other hand free when you walk around and wave an antenna about seeking out different stations on the same frequencies. I have a lot of fun doing this.