Why DMR users sound so funny

If you think it has anything to do with vocoders: the answer is “NO”.

Why DMR users sound so funny

A Hytera user testing the manufacturer’s claims. (via Google+)

 

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Puxing PX-780 DMR Radio

Puxing jumped the bandwagon too and introduces the Puxing PX-780/PX-820 DMR Tier II radio. Prices unknown at this time; you have to mail them through Alibaba.com for more information.

PuxingThe radio is available in both VHF and UHF versions. GPS appears to be a standard feature.

Puxing-780

General Specifications
Frequency Range 136-174MHz /400-470MHz /customized
Channel Capacity 1000/customized
antenna impedance 50Ω
Operating Voltage 7.4V  DC
Operating Temperature -30°C +60°C
store temperature -40°C +85°C
Battery Life in 5/5/90 operating mode
1700mAh standard Li-ion battery analog:10hours,digital:14hours
dust-protection and water resistant IP67
Size not including antenna 113.5mm×54mm×33.5mm
Weight with battery, antenna 270G
Transmitter
channel spacing 12.5khz
frequency stability +/-1ppm
Output Power low power:1W high power:4w
hum and noise -40dB@12.5khz
conducted,radiated spurious emission -36dBm@ <1Ghz,-30dBm@>1Ghz
adjacent channel power -60dB @12.5khz
ajacent transient channel power -50dB@ 12.5KHZ
FM modulation mode 12.5khz:11K0F3E
4FSK digital mode 12.5khz(data only):7K60FXD 12.5khz(data+voice):7K60FXE
modulation maximum deviation 2.5khz@12.5khz
nonactive slot power -57dBm
audio response +1dB–3dB
audio distortion 3%(type)
digital protocol ETSI TS 102 361-1,-2,-3
vocoder type AMBE+2TM
Receiver
channel spacing 12.5khz
frequency stability +/-1ppm
analog sensitivity 0.35μV/-116dBm(20dB SINAD)0.22μV/-120dBm(type)
digital sensitivity 0.3μV/-117.4dBm(BER 5%)0.7μV/-110dBm(BER1%)
intermodulation TIA603C:70dB ETSI:65dB
Adjacent Channel Selectivity TIA603C:65dB@12.5khz ETSI:60dB@12.5khz
co-channel rejection 12dB@12.5KHZ
spurious response rejection TIA603C:75dB ETSI:70dB
conducted spurious emission -57dBm@<1GHz,-47dBm@>1GHz
blocking 84dB
rated audio power 1w
audio response +1dB–3dB
rated audio distortion 3%(type)

Baofeng DA-77: Dual-band DMR radio

Baofeng DA-77Jason KC5HWB, Joop PA2JM, Carel PA3EHA and I had some pre-production pictures of this radio for quite a while, but some preliminary specs are now public.

The good
The most interesting fact is that the Baofeng DA-77 is a dual-band radio, something which didn’t exist so far. The second most interesting fact is the expected price point: $129,00.

The bad
Things bothering me a bit: only 160 memory positions and a meager 50 zones. Enough for professional use, but compared to the Connect Systems CS-700 (250 zones of 16 channels each) it’s far from impressive.

The ugly
The shell is identical to that of the UV-82, something I don’t like either. I do understand the decision though; re-using existing shells is much more cost effective than designing a new one. Another advantage is that accessories such as batteries are interchangeable.

Both Jason KC5HWB (Grapevine Ham Radio) and me are on Baofeng’s list for getting a review sample. To be honest I hope Jason gets one first, as he’s much more knowledgeable in this area than I am. Keep an eye on his blog.

Specifications

Dual-band, dual standby, mixed mode (DMR/FM) possible
– VOX
– CTCSS / DCS
– PC Programming
– FM
– Flashlight
– Single, group and general call
– Kill, Stun and revive
– Monitor, remote control
– Scanning
– Power saving
– Noise suppression function
– Manual dialing and storage dialing
– SMS
– AMBE+2TM vocoder

Frequency Range: VHF:136-174MHz AND 400-470MHz
– Memory channels: 160
– Zones: 50
– Operating Voltage: 7.4V
– Battery Capacity: 1800mAh
– Battery Average Working Time(5/5/90): 16 hours
– Frequency Stability: ±1.5ppm
– Antenna Impedance: 50Ω

– Power Output: 5/1 Watt (VHF), 4/1 Watt (UHF)
– Spurious Emission: – 36dBm1GHz/ – 30dBm≥1GHz
– Vocoder: AMBE+2TM

– Receiver Sensitivity: Digital 5%BER ≤0.3µV Analog ≤0.35µV
– Audio Distortion: <3%
– Conducted Radiation: –57dBm

STANDARD PACKAGE:

1. Baofeng DA-77 DMR Two-Way Transceiver
2. Dual-band Antenna
3. 110-240V Desktop Charger
4. Belt clip
5. User Manual
6. 1800mAh batterypack

Update codeplug CS700

DMR-logoIf the art of making code plugs taught me something, it’s that it’s hard to keep up with the developments. The latest NL version (see section Downloads in the top menu) now features 233 users and 12 repeaters (some of which aren’t networked yet).

The latest repeater is PI1DRA in Drachten. TX frequency 438.000 MHz, shift -7.6 MHz, Hytera, color code 1. This repeater will hopefully fill in one of the last white spots on the Dutch map.