QAS Audio Low

[qldvol]

I live on the northside of brisbane and can hardly hear the audio on QAS freq for this area .Is there audio volume lower than QFRS as that booms in on any of the freq I listen too, be it at home or when I/m mobile.I have tried using some of the differant freq on differant repeator freq when moving around and at home but they always seem to be down in volume..

Any help on this one

[Phil]

i think you will find that it has been set that way via the radio itself. crews can easily hear the radio operator however not other crews. it has been that way since i have been scanning in queensland.

[bodyguard]

what freq are you listening too ?
what area are you in ?

[FTX03]

That sounds a bit strange, why would QAS not want the other crews to hear tem selfs as good as Comms? FYI I do that've this problem on any of their voting channels however audio cuts out on of voting group 5 all the time. N
Dose it on both my radios but not my scanner? Any ideas?

[alinco21]

Perhaps it might have something to do with the dispatcher has a head set on with a boom radio mic just right besides her/his mouth. the Para's in the Ambulance have to pick up the said mike and speak into it, across it, into the back of it and even just push the PTT button whilst it is still in the cradle and speak loudly.

Yes they do hear each other quite fine, it is all about how you speak into the mike which would be the issue.

[Comint]

I live on the northside of brisbane and can hardly hear the audio on QAS freq for this area .Is there audio volume lower than QFRS as that booms in on any of the freq I listen too, be it at home or when I/m mobile.I have tried using some of the differant freq on differant repeator freq when moving around and at home but they always seem to be down in volume..

Any help on this one

I am only guessing here, but it is possible that all the QAS radios are set up for 12.5 kHz bandwidth, and the QFRS radios are still 25 kHz bandwidth, therefore the recovered audio from the QAS radios is less.

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Comint

[bodyguard]

QAS have always been quieter than QFRS or QPS, its just the way it is

[Comint]

Further to my previous post.

The ACMA's Radiocommunications Assignment and Licensing Instruction (RALI) MS 22, dated 10/12/2002, commonly known as the 400 MHz Band Plan, shows frequencies in the 415.5625 - 418.0875 MHz segment of the 400 MHz Band, as 12.5 kHz bandwidth, and frequencies in the 463.0125 - 469.4875 MHz segment, as 25 kHz bandwidth, hence the difference in recovered audio.

RALI MS 22 was updated in February 2011, to have 12.5 kHz bandwidth in both those areas, but that isn't required to be implemented for some time, and the QAS and QFRS frequencies would have been assigned under the old legislation anyway.

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Comint

[AIRMAN]

415.5625 - 418.0875 MHz as a program search with TS of 12.5 mHz.
Put the best (loudest) received in your memories

[Phantom]

415.5625 - 418.0875 MHz as a program search with TS of 12.5 mHz.
Put the best (loudest) received in your memories

I might be missing something .... care to refresh my brain what TS stands for ?

[alinco21]

Tone Search??

[Phantom]

Was not aware of a Tone that small/low?

I was thinking more along the lines of a frequency step of 12.5MHz... unless its a typo?

Where is comint when you need him? or better still airman may advise?

[bodyguard]

12.5kHz step is what it should be

[Comint]

I might be missing something .... care to refresh my brain what TS stands for ?

Tuning Step. And in this case, it should be kilohertz (kHz).

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Comint

[Phantom]

Ah there you are comint. Knew u would come thru with the goods.

[AIRMAN]

Mea Culpa - it should be 12.5 kHz!

TS is what I have on the keypad. It stands for tuning step. Whatever search that has been created by the user within a particular band, the TS function enables the user to select the scan step between each frequency. There are are 15 tuning steps available on my R20.

BTW the ACMA frequencies that Comint has stated in this thread reveal no voice traffic, just plenty of pager noises etc. QAS voice is 412.000 to 413.000 mHz in my area.

I agree about the QAS dispatch sometimes having 'sotto voce'. This is a common problem with boom mikes. Another is the placement of the boom in relation to the mouth.

QFRS have good radio procedure with 'read back' requirement as in aviation.

[Comint]

BTW the ACMA frequencies that Comint has stated in this thread reveal no voice traffic, just plenty of pager noises etc. QAS voice is 412.000 to 413.000 mHz in my area.

Obviously had my mind on something else when I wrote that post.

The same ACMA document shows the 412.4625 - 415.5625 Mhz segment as having a bandwidth of 25 kHz, so that neutralises my explanation for the low audio.

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Comint

[Phantom]

The mystery continues