Custom DC to Daylight all-in-one SDR ham radio/test equipment

Discussion in 'Homebrew and Kit Projects' started by AA7QQ, Apr 4, 2018.

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  1. AA7QQ

    AA7QQ Ham Member QRZ Page

    Starting with a LimeSDR USB & a bunch of other junk.
    OK, here’s the somewhat finalized TX chain, copper spreader (Under amp modules), heat sink, enclosure & autotuner.
    Since I decided that there was no way possible to fit everything in the 2"X10"X12", so, I discarded the back shell & will be making a new one that gives me 3 1/2 - 4" of depth.

    [​IMG]
    20180331_092449_001.jpg4032x3024 2.75 MB

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    This shows a general picture of the parts (Less LPFs for VHF/UHF.
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    20180331_092609.jpg2851x2138 2.77 MB

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    Output of LimeSDRUSB to HP programmable attenuator, to bandswitching relays.
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    20180331_092514.jpg2851x2138 2.61 MB

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    Another general overlook.
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    20180331_092631.jpg2851x2138 2.24 MB

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    Input to 1 SPDT SMA latching relay, then each output to another. Stage 2 relays A switches VHF/UHF, B switches HF/6M & exterior output.
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    20180331_092717.jpg2851x2138 2.55 MB

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    From the VHF/UHF band relay, comes outputs to each Class AB module, through a directional coupler. The VU OUT latching relay in the middle will get LPFs between it & the amp modules. THen, the common will go to a mutual VHF/UHF port.
    [​IMG]
    20180331_092737.jpg2851x2138 2.92 MB

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    In this, you can see the third amp feed, also through a coupler for monitoring, then to the TS-440SAT PA, LPFs, (Not shown BCD board that I have to dremel apart), & the autotuner.
    [​IMG]
    20180331_092452.jpg2851x2138 2.23 MB


    So, there’s the somewhat complete TX chain.
    When I get the LPFs in, I will test it out. I still need to get BPFs for VHF/UHF, receive, too.
    All ports of the Lime will still come out the back. THe input to the LimeSDRUSB will be KVMd to allow operation from the Udoo X86 Ultra, or, any other PC. Network, DP/HDMI, RS-232, USB3.0 & a GPIO plug for 12-15 connections.

    I am sure that there will be more, along the way, but wanted to show what the plan has morphed into.

    Ed
     
    VK4FFAB, KA9JLM, KB4QAA and 1 other person like this.
  2. KD2ACO

    KD2ACO Platinum Subscriber Life Member Platinum Subscriber QRZ Page

    Looks like my house... no horizontal surface uncovered. :p
     
  3. N3DT

    N3DT Ham Member QRZ Page

    I've got some simple 5 pole designs for VHF/UHF if you're interested. Less than 1dB loss. Standard parts, wind your one coil.
     
  4. AA7QQ

    AA7QQ Ham Member QRZ Page

    I do thank you, but have SP4T 28V TTL with indicator & 50 ohm load for unused contact relays on the way. 12 of them.
    Lesson learned: Sometimes, using what is in the scrap heap can cost you.
    Had I used a TS-2000 or other DC to daylight PA/filter system, I could have saved mych space & money.
    But, I was just going to make an HF rig. Then, heck, why not V/U...
    Next radio will be with the Jetpack TX2 & a PCIe SDR for home use. I am on the hunt for a toasted TS-2000 or the like.

    Ed
     
  5. N3DT

    N3DT Ham Member QRZ Page

    I'm talking about filters for 2M and 435. Not switches.
     
  6. WA9SVD

    WA9SVD Ham Member QRZ Page

    I take it, it's bigger than a bread box?:confused: Good work!
     
  7. KL7AJ

    KL7AJ Premium Subscriber QRZ Page

    I see you put in on top of a stove to increase the "range." Nice trick! :)
     
    VE3CGA likes this.
  8. KA9JLM

    KA9JLM Ham Member QRZ Page

    I like that setup.

    You can really bake the electronics.
     
  9. AA7QQ

    AA7QQ Ham Member QRZ Page

    OK, back to the magic stovetop....
    Things have changed. I got an FT857 with a burnt driver. The whole PA section is fine. TXin/TXout & some CAT to serial voodoo for all of the bandswitching.
    I'll upload photos later, but there are some on my bio page.
    https://www.qrz.com/lookup

    Ed
     
  10. AA7QQ

    AA7QQ Ham Member QRZ Page

    I am sorry for not responding earlier. I got an 857 for the PA system that makes it all nice & compact.
    Please tell me more about your filters. I will be using the other parts in the next project.
    G5 Mac PC case, Nvidia TX2, A PCIe SDR card, the former PS system/contraption using the TS-440 stuff & V/UHF amps all going to limit LDMOS amps that will be water cooled.
    So, i will be needing 100W & limit V/UHF filters.

    Ed
     

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