400MHz Trunking issues

[rredbeak]

Scanner is DTR 96 and trunking qantas motorola 400 MHz has no audio.

Base Freq 463.000
offset 500
25KHz.

scanning it stops on "VC" [voice channel] BUT no audio. The Freq displayed is 410/411/412 MHz range even tho the CCh's are in the 464 Range

In MANUAL mode on a 464 FREQ it comes through perfect audio with tgid Displayed. \\Once i hit scan it comes up everything [freq in the 410,411,412 Range] EXCEPT audio.

Shouldnt it come up on the display in the nominated 464 MHz freqs? not 410 ???

Is it possible the base freq is wrong? Or the Offset ? Or the setp KHz ?

WHILE at the airport the motorola 800MHz trunking is PERFECT on scan and audio is displayed on the cch freqs,shouldnt the 400MHz be the same please??

Are there any suggestions of base ,offset,spacing to TRY please??

TY.. Rod

Its something VERY small..annoying LOL.

[rredbeak]

The only thing i havent programmed in is the connect tone 105.88

Is this the issue ? i never put tones in and it trunks sweet on 800MHz

[Phil]

Rod,

it sounds like the base frequency on the site is set incorrectly however i have very little knowledge of this scanner and from what iv been told it is a difficult scanner to program. ill have a look at one of the manuals and see how it goes

[Comint]

The only thing i havent programmed in is the connect tone 105.88

Is this the issue ? i never put tones in and it trunks sweet on 800MHz

Why start another thread on the same topic.?

~~~~~~~~~

As far as I know, there is no where to input a Connect Tone. And scanners don't use Connect Tones (Don't be confused with CTCSS Tones).

Supposedly, Motorola uses the Connect Tones so that multiple Systems can use the same frequencies without the Mobiles getting confused and ending up on the wrong Network.

In theory, at least, you could have another System at say Pinkenba, with the same frequencies/channel numbers, but a different Connect Tone, and both systems would happily co-exist. The real world is a lot different.

The fact that you are getting the wrong frequencies, indicates that the scanner is not recognising the Base Frequency/Offset correctly.

The Base Frequency / Offset / Step are correct, as I was the one who originally discovered them. And as far as I know, others have successfully used that information, with other scanners, without problems - just not with a DTS-96.

--
Comint

[Comint]

scanning it stops on "VC" [voice channel] BUT no audio. The Freq displayed is 410/411/412 MHz range even tho the CCh's are in the 464 Range

In MANUAL mode on a 464 FREQ it comes through perfect audio with tgid Displayed. \\Once i hit scan it comes up everything [freq in the 410,411,412 Range] EXCEPT audio.

Please post the EXACT frequencies it is displaying (and the Channel Number, if that is possible). Generalizations aren't going to get the problem fixed.

--
Comint

[rredbeak]

i took note of a couple.

410.32500

412.52500

[rredbeak]

Phil,
While i was there i changed the base freq and then re enterred the correct one to be sure its in there.463.000 Is the Correct one

[Comint]

i took note of a couple.

410.32500

412.52500

OK, my guess is, the complete list of INCORRECT frequencies would be:-

410.3250
411.6250
411.9500
412.1750
412.5250

--
Comint

[Comint]

When entering the individual Channel frequencies, did you set the Receive Mode for each one to Mot.?

--
Comint

[rredbeak]

these are the loaded channels and are programmed in as Motorola.
464.3250
465.6250
465.9500
466.1750
466.5250

The CCh is consistantly 466.1750,ive never seen a rotation on 400 MHz.

In Manual mode ANY of these ch's brings up audio and tgid.

What ill do is go back in a day or so and ill video the scanner running so you can see what im getting The Display MIGHT even show channel numbers but i never thought to write them down

[rredbeak]

i dont understand why its stepping 50Mhz. Trunkview is only a few MHz.Motorola 800 MHz is only a few MHz

[Comint]

The CCh is consistantly 466.1750,ive never seen a rotation on 400 MHz.

Interesting! I've usually seen it with 464.3250 MHz as the Main CC, with only occasional use of 466.1750 MHz.

As has been mentioned on these Forums before, the Site Controller only transmits Channel numbers, not frequencies. So to get the incorrect frequencies you listed (shown below in Red), you would need a Base Frequency of 406 MHz (which, according to the PRO-96 Manual, is the Default Base Frequency), and an Offset of 380 (according to the PRO-96 Manual, the Default Offset is 0 (Zero), but I don't know about the DTS-96 default - it may be 380).

410.3250
411.6250
411.9500
412.1750
412.5250

--
Comint

Edit: After a more leisurely read of the PRO-96 Manual, I see that the Default Offset is actually 380, and NOT 0 (Zero) as posted above.

[rredbeak]

Ill put up some pics AND in a few days a video IF i can get it to focus that close as the display is tiny..

I know the manual gives a default of 406.000 and 380 But i loaded 463 etc without hiccups.Then i changed it intentionally to 466.000 so i could re load the 463.000 again

I got to go out but ill do the pic asap.

It DOES sound very sus tho cause the 406.000 is as you say the default.

Rod

[rredbeak]

ok did a pic and its focussed enough to do the job.

I also did a test video and the focus is GOOD so next time im at the apt ill give you a live demo..


It DOESNT come up on here properly BUT it is offset 500

On face value id say its programmed ok.

Cheers Rod

[rooster]

I am not sure if this will help, but from when I last monitored this system with Unitrunker, it had the LCN's listed as:

553 464.3250
605 465.6250
618 465.9500
627 466.1750
641 466.5250

I can't give the band plan details as these only display in UT when monitoring a system - and I am not near BNE at the moment.

[Comint]

I am not sure if this will help, but from when I last monitored this system with Unitrunker, it had the LCN's listed as:

553 464.3250
605 465.6250
618 465.9500
627 466.1750
641 466.5250

I can't give the band plan details as these only display in UT when monitoring a system - and I am not near BNE at the moment.

Yes. That's if you have a Base Frequency of 463.0000 MHz Offset 500. However, the particular DTS-96 is acting as if the Base Frequency is 406.0000 MHz Offset 380, for the same Channel Numbers.

410.3250 plus 54 equals 464.3250 - Ch 553
411.6250
411.9500
412.1750
412.5250 plus 54 equals 466.5250 - Ch 641

463.0000 MHz minus 406.0000 MHz equals 54 MHz.

--
Comint

[rredbeak]

ive got 2 dts96's. theyre cloned.

Should i reset mine??? its a simple matter of d/l the clone freqs.

I HAVENT tried the other 96 as i gave it to my daughter but the programming is identical.

Rod

[rredbeak]

yes ,a few posts up. The dtr 96 offset default is 380

[Comint]

yes ,a few posts up. The dtr 96 offset default is 380

Too bad someone didn't have the time, and the knowledge, to put together a comprehensive list of the differences between the American models, and their Australianised versions. It would certainly make life easier for a lot of people.

For example: differences between the PRO-96 and the DTS-96, or the BCD396T and the UBCD396T.

Not just the differences in frequency coverage, but also differences in default values, etc.

--
Comint

[rredbeak]

It'll all work out even if it means THIS single scanner is faulty. But it will become clear.

Ill take my Daughter planespotting again then ill trey both scanners as theyre the identical units,shes a rf freak too so everything i had i cloned for her to monitor.

Ill also do a video cause it can be paused.

As for similar brands [LOL] its very odd OTHER than the Ph Band and thats clear in different countries BUT programming and defaults being different is hard to understand.

Rod