HR2.0 - Anytone AT-D578UV Pro DMR Mobile Radio

Discussion in 'Amateur Radio News' started by KC5HWB, Dec 31, 2019.

ad: L-HROutlet
ad: l-rl
ad: MessiPaoloni-1
ad: Subscribe
ad: Left-2
ad: L-MFJ
ad: Left-3
  1. KC5HWB

    KC5HWB Ham Member QRZ Page

    Episode 287 is posted for the Anytone AT-D578UVIII Pro DMR Mobile Radio - Part 1!

    The long awaited AT-D578UVIII Pro Radio is here for DMR Mobile Users. This feature-packed "Pro" model includes GPS, APRS and Bluetooth, and for Operators in the USA, it also includes the 1.25M 220MHz band. Let's take a first look at this radio, how to update the firmware, attempting to load a codeplug, and some power output tests in this first, but certainly not last, episode.

     
    KE5PYF and K1ZBT like this.
  2. WB8VLC

    WB8VLC Ham Member QRZ Page

    Jason,

    The low 220 MHZ TX POWER is a concern as it's no higher than a HT.

    Can you measure the 12db SINAD of the RX across all bands and a 220 transmitter spectrum analyzer plot, a SDR receiver should be adequate to see what the 220 TX spectrum looks like if a spectrum analyzer isn't available?

    With such low 220 tx power output I'd bet that 220 BAND is using the same TX low pass filter that 137-174 MHZ uses and 220 MHZ may be operating with these high TX POWER losses because it is operating into the VHF 137-174 MHZ LOW PASS FILTERS cutoff/transition band with possibly 3 to 6 db higher loss as opposed to less than 1db which would be normal.

    As a result 220 MHZ may have similar high RX sensitivity losses resulting in reduced 220 RX sensitivity.

    WOUXAN did this in some of their early UV5 VHF/UHF HT's, they added firmware updates enabling 220 MHZ but since they made no hardware mods extending the TX low pass filter out for 220 MHZ, the result was very low 220 TX power, excessive TX harmonics and numerous spurs on 220 TX and reduced 220 RX sensitivity.
     
    K5MPH, WA5KM, K3RW and 1 other person like this.
  3. N1UXA

    N1UXA Ham Member QRZ Page

    Hey there,

    You mentioned a firmware update of 1.05A. I can only find 1.05. Do you have something different? I understand there are problems with the 1.05 update.
     
    KC5HWB likes this.
  4. KC5HWB

    KC5HWB Ham Member QRZ Page

    105a was the beta version that was available when I recorded this video. 1.05 is the official production release, that is the one you want.
     
  5. N1UXA

    N1UXA Ham Member QRZ Page

    I am leaving mine at 1.03 as I have heard, (direct from my distributer - and others), that the 1.05 firmware breaks more than it fixes.
    Great video however, nice work as always!
     
  6. WB8VLC

    WB8VLC Ham Member QRZ Page

Share This Page