I have 4 sites, all the same frequencies, different PL's. 3 stations are Quantars and the fourth is a MTR2000. The MTR and one of the quantars are on adjacent tones (127.3 and 131.8 ). The MTR seems to false on the reverse burst when someone is on the 131.8 tone. The other 2 repeaters have tones of 100.0 and 94.8, no problems with them falsing the MTR. I also noticed this with 2 MTR's I was working with on ham with the tones of 151.4 and 156.7. This only happens upon the unkey of the mobile, and with several different models of Motorola radios.
Any ideas??? I don't want to change tones as it is a large fleet to reprogram.
Josh
MTR2000 falsing on adjacent PL
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Dan562
- Posts: 533
- Joined: Mon Aug 23, 2004 7:30 pm
- What radios do you own?: Kenwood, Yaesu, ICOM, Motorola
PL Falsing Reverse Burst
Hello Josh,
You've got 4 repeater stations on the same frequency pair, 3 Quantars and 1 MTR2000. How do you have these stations configured as 25 kHz or 12.5 kHz channel spacing? How are all the Subscriber units configured as 25 kHz or 12.5 kHz? Have you checked the Subscriber units for over deviation limits, PL Deviation +/- 750 Hz and with the 1 kHz audio should be +/- 5 kHz maximum? Since you haven't stated the age of the Quantars and the MTR2000 ... there may be a known problem with the old firmware and software to correct your complaint.
Dan
You've got 4 repeater stations on the same frequency pair, 3 Quantars and 1 MTR2000. How do you have these stations configured as 25 kHz or 12.5 kHz channel spacing? How are all the Subscriber units configured as 25 kHz or 12.5 kHz? Have you checked the Subscriber units for over deviation limits, PL Deviation +/- 750 Hz and with the 1 kHz audio should be +/- 5 kHz maximum? Since you haven't stated the age of the Quantars and the MTR2000 ... there may be a known problem with the old firmware and software to correct your complaint.
Dan
more info
Dan,
The Quantars are not the problem. They do not false, only the MTR2000 does. The MTR is an older unit, I think version 2 firmware as it does not support MRTI. I went up yesterday and made a change in the programming in the station config screen. I checked the box for I beileve they call it alternate PL decode. It changes the way the station deals with the reverse burst.
Everything is 25kc channels. Since this happens with 3 of my radios that I know have proper deviation, I don't think it is the mobiles.
We'll see how it plays with this one change.
Josh
now K6ZRX
The Quantars are not the problem. They do not false, only the MTR2000 does. The MTR is an older unit, I think version 2 firmware as it does not support MRTI. I went up yesterday and made a change in the programming in the station config screen. I checked the box for I beileve they call it alternate PL decode. It changes the way the station deals with the reverse burst.
Everything is 25kc channels. Since this happens with 3 of my radios that I know have proper deviation, I don't think it is the mobiles.
We'll see how it plays with this one change.
Josh
now K6ZRX