Results 1 to 5 of 5

Thread: Vertex's VX-920 radios with SRX sub-receiver board. Anyone come across?

  1. #1
    Join Date
    Jun 25, 2013
    Posts
    747
    Thanks
    372
    Thanked 169 Times in 113 Posts
    Country: Belarus

    Question Vertex's VX-920 radios with SRX sub-receiver board. Anyone come across?

    Hi folks!

    I've been playing with Vertex-Standard VX-920 series radio (includes VX-921, VX-924, VX-929) with SRX-3* modules installed for a few years. There are no problems with them in general, but I have some particular issue. When you install SRX-3H (380-450MHz) sub-receiver into VHF 136-174MHz radio, it recognizes SRX-3D sub-receiver as 450-510MHz sub-receiver (SRX-3H).

    Here is what I tried:

    1. VXSTD USA support in '17-18 years. They were useless - only short 'dummy' answers.
    2. CE59 software from 4.0 to 5.04. EXP and US versions.
    3. CE59 manufacturer (Developer Only) mode
    4. Different radio firmware versions: 1.93, 3.03, 3.04, 3.05
    5. Different VX-929E radios (one is from '13 and made in Japan, and another one made in '17 and Made in China).

    No luck at all.

    VXSTD US support supposed that my sub-receiver is actually SRX-3D (high-band), but I can easily reject their version. There are a few reasons:

    1. Sub-receiver is brand new and I have genuine packaging with appropriate sales number (AAD34U002 vs AAD34U001).
    2. Sub-receiver is deaf above 460MHz. I checked with RF SG. It can't here even -90dBm.
    3. VCO unlocks at the high test (alignment) frequencies like 480 and 510MHz.
    4. It cannot be properly aligned in F8 mode because test (alignment) frequencies are high, and auto-adjust process goes wrong.
    5. I found SRX's schematics (available here) and checked it for hardware differences (excluding RF section, like front-end). I and found out and confirmed that my sub-receiver has factory installed R4002 (1000 Ohm) and C4004:

    SRX-3H-components-installed-680.jpg

    So, I am 100% sure that I have SRX-3H for 380-450MHz installed.

    But the only problem - CE59 thinks different, and there are no other options in drop down menu:

    SRX-3H-detection2.png

    The only version I have - underdeveloped Vertex product. They released SRX-3H years later after SRX-3D, and probably didn't tested it in full. Version may sound crazy, but I have no other ideas. Most of other ideas disapproved by my experiments.

    Any other thoughs, guys? I am really stuck with it.

    Especially, I would be glad to know that someone have SRX-3H (low band version) up and running.

    Thanks in advance.
    Everyone who loves RadioReference get into the hell. Especially those who also love PL-259 connectors.


  2. #2
    Join Date
    Feb 18, 2012
    Location
    That's Correct.
    Posts
    222
    Thanks
    1,442
    Thanked 344 Times in 101 Posts

    Default

    I wish I could offer some help, but I learned something new today. Still have an old Vertex DUO sitting at home. Had no idea they offered a second receiver in the VX-900 series.

  3. #3
    Join Date
    Jun 25, 2013
    Posts
    747
    Thanks
    372
    Thanked 169 Times in 113 Posts
    Country: Belarus

    Default

    Quote Originally Posted by Avery Johannssenn View Post
    I wish I could offer some help, but I learned something new today. Still have an old Vertex DUO sitting at home. Had no idea they offered a second receiver in the VX-900 series.
    Not for VX-900, but for VX-920 series. They are totally different.
    Everyone who loves RadioReference get into the hell. Especially those who also love PL-259 connectors.

  4. #4
    Join Date
    Nov 22, 2012
    Posts
    94
    Thanks
    9
    Thanked 38 Times in 22 Posts
    Country: United States

    Default

    I'm not much of a Vertex expert, but I've always used CE76 programming software with P25 capable P824, P924, and VX-7200's. Don't think I've ever used CE59...

  5. #5
    Join Date
    Jun 25, 2013
    Posts
    747
    Thanks
    372
    Thanked 169 Times in 113 Posts
    Country: Belarus

    Default

    Quote Originally Posted by tbiggums View Post
    I'm not much of a Vertex expert, but I've always used CE76 programming software with P25 capable P824, P924, and VX-7200's. Don't think I've ever used CE59...
    That's right! It's because you're talking about VX-P920, but I am talking about VX-920! They are mostly identical excluding the firmware, VSCM factory installed in "P" family and, probably, some minor differences on PCB (unconfirmed). "P" can do digital, but non-"P" - cannot. This is why they uses different programming software.
    Everyone who loves RadioReference get into the hell. Especially those who also love PL-259 connectors.

  6. The Following User Says Thank You to MotFAN For This Useful Post:

    tbiggums (Jan 08, 2019)