Middlesex county weird talkgroup

[devicenull]

On Middlesex County/Sayreville Trunking System, Middlesex County, New Jersey - Scanner Frequencies - I noticed the attached message being repeated on talkgroup 64504 every 45-60 seconds. Seems to be related to a radio quality measurement? https://www.cs.columbia.edu/~hgs/audio/harvard.html

Are the 800mhz frequencies actually being used here, or are they still in testing?

 

[rr60]

Yes, you are correct. This TG has been used for many months. This was discussed here some time ago. I looked for the thread but could not spot it.

It is thought that it is being used by those considering using TRS to test signal quality.

 

[mdsxfire]

yeah they’re for speech quality measurements which can be used at various signal strengths to see how the quality varies. like he said 👆🏻
i’ve asked the same question about the 800 freq they from what responses i’ve gotten are used but not as primary if the 700s are all being used the they would start being utilized. not sure how factual that is, would need someone to run a log on the system to actually see how much they are used

 

[ecps92]

Middlesex County TRS Coded Message

”This will lead the world to more sound and fury. These thistles bend in a high wind”. Over and over and over every 10 seconds on the TRS. TG 64504 UID 1001014. Of course Google has the answer. Used to test for audio quality. “The phrases, called “Harvard sentences,” are phonetically...

forums.radioreference.com

Yes, you are correct. This TG has been used for many months. This was discussed here some time ago. I looked for the thread but could not spot it.

It is thought that it is being used by those considering using TRS to test signal quality.

 

[kd2pm]

They are from Harvard Sentences. (https://en.wikipedia.org/wiki/Harvard_sentences).

Rather than doing BER or BLER scoring, its best to use PESQ scoring on digital communications. These sentences are recorded back when monitoring the OTA calls. That recording is then compared to the raw or original and then a PESQ evaluation is used to come up with the MOS. Typically end users prefer to see a 3.0 or better score which means communications is clear and readable with little to no loss in syllables.

They will usually have a device hooked up on the P25 radio that transmits the sentences and a receiver at a known good location that will record it. That way they can tell where they have good or bad uplink signals.

For more about PESQ, here is easy to understand website What is PESQ

 

[devicenull]

FWIW I did find these on Middlesex County/Sayreville - All Calls Live