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Proven: The MFJ-1708SDR Degrades your Transceiver's Performance

Discussion in 'Videos and Podcasts' started by VK3BL, Jul 15, 2018.

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  1. ON3MK

    ON3MK Ham Member QRZ Page

    Have the MFJ1708B any loss in DB?
     
  2. WB8YQJ

    WB8YQJ Ham Member QRZ Page

    I have one of the MFJ1708B, and yes there is some loss but it is acceptable at HF for me. When I bought the new unit both receive terminals had severe attenuation, more than 10db, but the transmit antenna did not, after inspecting the splitter transformer I noticed there was some wire insulation mixed in with the solder and I was able to clean the joints out with a moderate addition of solder from the top side of the PCB. It is very hard to disassemble the switch, some hex nuts on the connectors that you cannot get at.
     
  3. WB8YQJ

    WB8YQJ Ham Member QRZ Page

    MFJ1708BSDR Splitter attenuation seems to be between 3db to 4db testing on 28Mhz tonight using my simple measurements, with the SDR SO239 showing 1db stronger than the Transceive SO239.


     
    AA5CT likes this.
  4. AA5CT

    AA5CT Ham Member QRZ Page

    Kudos; actual numbers.

    Mankind advances ...
     
  5. WB8YQJ

    WB8YQJ Ham Member QRZ Page

    AA5CT likes this.
  6. WQ2H

    WQ2H QRZ Lifetime Member #214 Platinum Subscriber Life Member QRZ Page

    Thank you Don for that test info, and the review. :)

    Here's my tongue in cheek remedy for those concerned about losing a few db against losing an SDR.

    Lowfer_stuff.jpg
     

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