MTR3000 or DR3000, what is the difference?

Other than price, the difference between the MTR3000 and DR3000 is sometimes not that obvious.

The MTR3000 has built-in wireline (TRC) support whereas the DR3000 would require an external tone remote adapter. This makes the MTR3000 well suited for legacy analogue applications where tone remote or DC remote control are needed.

The MTR3000 can be ordered in a multitude of possible configurations whereas the DR3000 cannot. This means that the MTR3000 can be used in niche applications where only a bespoke repeater would be suited.

The MTR3000 has an input for an external reference oscillator whereas the DR3000 can only run off the internal oscillators. The external oscillator can be devired from a (oven-controlled) high-stability oscillator; GPS receiver or atomic clock (i.e. Rubidium or Caesium standard) increasing the standard 0,5ppm stability to the order of 5ppb.

There are also differences in the specifications: I have takes the specification sheets of both repeaters, and put them side-by-side. I have highlighted where there are differences and whether this difference is an advantage or not.

Channel Capacity1616
TX Power - Low Power Models1 to 25WNone
TX Power - High Power Models25 to 40W8 to 100W
VHF Frequency Band136-174 MHz136-174 MHz
UHF1 Frequency Band403-470 MHz403-470 MHz
UHF2 Frequency Band450-527 MHz470-524 MHz
Dimensions (HxWxL)132,6 x 482,6 x 296,5 mm (4U)133 x 483 x 419 mm (4U)
Voltage Requirements AC100-240VAC85 to 264 VAC
Voltage Requirements DC13,6VDC28,6VDC
Standby Current Drain AC0,5A0,4A
Standby Current Drain DC1A0,8A
Transmit Current Drain AC (Full Power)1,5A
Transmit Current Drain AC (Full Power)4A1,9A
Transmit Current Drain DC (Full Power)7,5A
Transmit Current Drain DC (Full Power)12A12,2A
Operating Temperature Range-30°C to +60°C-30°C to +60°C
Maximum Duty Cycle (Full Power)100%100%
Analogue Channel Spacing12,5; 20 or 25 kHz12,5; 20 or 25 kHz
Digital Channel Spacing12,5kHz12,5kHz
Frequency Stability0,5ppm0,5ppm
Analogue Sensitivity (12dB SINAD)0,22µV0,22µV
Digital Sensitivity (5% BER)0,3µV0,3µV
Intermodulation70 dB95dB
Adjacent Channel Selectivity 12,5kHz60dB75dB
Adjacent Channel Selectivity 20/25kHz70dB80dB
Spurious Rejection70dB85dB
Audio Distortion at Rated Audio (typical)3%3%
Hum and Noise 12,5kHz-40 dB-45dB
Hum and Noise 20/25kHz-45dB-50dB
Audio Response+1dB/-3 dB+1dB/-3 dB
Conducted Spurious Emission >1GHz-57 dBm-65 dBm
Modulation Limiting 12,5kHz2,5 kHz2,5 kHz
Modulation Limiting 20kHz4 kHz4 kHz
Modulation Limiting 25kHz5kHz5kHz
Conducted / Radiated Emission >1GHz-36 dBm-36 dBm
Conducted / Radiated Emission <1GHz-30 dBm-30 dBm
Adjacent Channel Power 12,5kHz-60dB-70dB
Adjacent Channel Power 20/25kHz-70 dB-75 dB
Audio Distortion3%3%
Digital Vocoder TypeAMBE+2AMBE+2
Digital ProtocolETSI-TS 102 361-1, 2 & 3ETSI-TS 102 361-1, 2 & 3
Difference (no advantage)

1 comment:

  1. I had to re-post this, as there were problems with the rendering of the table in the original post.


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