Login
You're viewing the front-end.social public feed.
  • Jun 17, 2026, 1:14 PM

    New one. Simoco SRP1000. Been missing one of these from the collection for a while and saw one come up on eBay. Basically an SRM1000 in an extremely large, heavy but allegedly “handportable” enclosure. Probably not much chance of programming this one but still a nice bit of history to own. Weighs about 700g, apparently 3W Tx. Might have a go at powering it up this evening and do a teardown too. #tetra #hamradio

    A Simoco SRP1000. It’s huge and weighs a ton.
    💬 2🔄 0⭐ 15

Replies

  • 💬 0🔄 0⭐ 4
  • Jun 17, 2026, 1:38 PM

    (anakin meme)

    "So these new digital radios, they'll be smaller, lighter and have better battery life than the analog ones we use now right?"

    "right?"

    💬 0🔄 2⭐ 8
  • Jun 18, 2026, 6:19 PM

    Bit of playing with the SRP1000. It works (kinda!)

    A video turning on & briefly testing a Simoco SRP1000 TETRA radio. The narrator explains that the radio turns on, transmits but none of the keys work other than PTT and the volume control.
    💬 1🔄 0⭐ 11
  • Jun 18, 2026, 6:33 PM

    By the way, this is what I mean by “horrible”. Cadmium dust. Don’t breathe this.

    Some very crusty old batteries. A gloved hand is in shot. Yes I had a mask, eye protection and long gloves on.
    💬 0🔄 5⭐ 13
  • Jun 18, 2026, 6:59 PM

    So this would go some way to explain what’s going on with the buttons… seems like somebody with a less than excellent grasp of SMT rework has had a go at this Atmel micro. Mmm.

    The radio opened up. The flex for the buttons is plugged into a ribbon connector on a small PCB behind the keypad. There’s a microcontroller on the PCB.
    The microcontroller looking badly reworked
    A square on shot of the PCB.
    💬 0🔄 1⭐ 12
  • Jun 18, 2026, 7:09 PM

    Probably one of the worst bits to be dead really because I’ll never be able to obtain a flashed replacement part.

    💬 0🔄 0⭐ 2
  • Jun 18, 2026, 7:15 PM

    Being able to run this board without it being smooshed up against the radio would be handy. Do you reckon Philips/Simoco had extensions cables for these connectors in the lab? Can you buy them anywhere?! I don’t even know what those connectors are called. Connector nerds, assemble! #electronics

    Two board to board connectors
    💬 0🔄 9⭐ 10
  • Jun 19, 2026, 11:13 AM

    I bought some AT89S8253-24AUs anyway, in the very unlikely chance that I can read the flash off the micro that's already on there and replace it (or find someone with a working SRP1000 that can do that - unlikely!). I expect the protection bits are set.

    Also got a TQFP44 -> DIP40 adapter for my TL866ii on the way.

    💬 0🔄 0⭐ 1
  • Jun 19, 2026, 2:06 PM

    Actually giving up on this. On closer inspection the connector between the two boards is gunked, and while reflowing the existing chip, some flux cleaner got underneath the display ribbon connector and dissolved some of the conductive adhesive (?) that bonds the LCD drive signal lines to the LCD ribbon.

    I bought this radio as an ornament really, so I'm fine with it being non-functional. Maybe one day if another pops up I'll have a donor for bits to fix another anyway.

    The ribbon connector between the display driver and the LCD glass. It appears to be bonded with some sort of conductive adhesive rather than solder?
    💬 0🔄 0⭐ 0
  • Jun 19, 2026, 2:17 PM

    Anyway, teardown pics. SRP1000. Almost identical to the Simoco SRP01 I have. Very similar to the SRM1000 too. Motorola PHW amplifier. 68k main CPU. ADSP-2183 DSP. Some custom part from Atmel (AT55534). An unknown part from "WM" (I expect this is some sort of I/Q mod/demod).

    #tetra #hamradio

    Side of the board with the DSP, a custom Atmel part, an unknown "WM" part,  amplifier.
    Side of the board with the CPU, Flash, RAM, some big caps for the amplifier. Lots of RF goodies.
    💬 0🔄 1⭐ 1