Fri Sep 17, 2021 12:55 am
1st quick pass of all that audio thru Audacity, looks like all the tone sets are 1 sec. A tone, 3 seconds B-tone. Standard. I'd say it's still something on the decoder board.
Notice starting at 0:40 seconds, there's one tone, and Tone 1 light comes on, and stays on thru the 2nd tone, even tho they are different, way different. That's wrong. Next, Tone 1 light comes on for the 1st tone in the next sequence then Tone 2 light comes on for the 2nd tone, and obviously it decodes and turns on the relay.
Taking your Bandwidth selection in the programming screens, 2.5, I'd guess (educated guess, but still a guess) that that's 2.5% bandwidth. 496.6 + and minus 2.5 % gives you a range from 484 Hz to 509 Hz.
Ahhh, let's half that: 2.5% BW is the TOTAL width around that center frequency, that will mean 1.25 % below, and 1.25% above; that gives 490.5 Hz, to 502 Hz;
A closer look with Audacity that 1st tone, the one that keeps Tone 1 light on throughout the whole A-B sequence, decodes to 480 Hz. Then 670 Hz, for B tone. The 2nd pair of tones in that time frame I see as 511 Hz, and 670 Hz. 5
Closest standard paging tones are 483.5 Hz, 510.5 Hz. and 669.9 Hz. Finding the 2.5% bandwidths for each of those is 477.5 Hz to 489.5 Hz, then 504.2 Hz to 516.9 Hz, and last 661.6 Hz to 678.2
Try changing your tone set 1 to 483.5 & 669.9, and tone set 2 to 510.5 and 669.9.
I'm sorry this has been going on for 2 years for you, that sucks. I have an opinion on who's doing the worst finger pointing, but I'll reserve it. IMHO, your actual transmitted tones should have been checked before installation. But you have to put your behind in your past. Over the years, lots of errors can creep into systems, and people THINK they know what settings are, rather than verifying in the field.
A competent radio tech with a decent service monitor should be able to generate these sequences at the site and test, or whatever tone sequences the decoder is programmed to respond to. Oh, and the radio itself needs to be on frequency; again, a competent radio tech should be able to look for the Local Oscillator frequency generated in the radio; it should be within a couple parts per million. I don't know much about the Maxon radio; probably programmable, and if it's LO has drifted too far, or the programmed frequency is just too far away from the actual radio frequency, decoding the tones will be very unreliable. But that is (again, IMO) a bit of a long shot.
Now, all this I've written is just from some quick noodling using the Audacity program, without doing a lot of proper filtering to exclude stuff that shouldn't matter to the decoder.
tried to attach a tone signaling chart, failed.