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Ears

Discussion in 'Amateur Radio Modifications' started by kopcicle, Aug 18, 2018.

  1. kopcicle

    kopcicle Well-Known Member

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    So here's the procedure for small signal work here.
    Send the garage to cold iron as it contains two PWM controllers and a LOM server that is WOL but still has switching supply noise.
    Four breakers go down. These control the heat plant , the leg that has all the Comcrap/Xfinity garbage on it , 220 to the kitchen, and the laundry room.
    Bench supply and oscilloscopes off
    Freq counter off
    AVTVM, HVVTVM, LVVTVM, off
    Local computer to stby/WOL (minimal drain and imperceptible addition to the noise floor)
    MN2700B Pi-L tuner used much like a preselector .(working on a 2MHz BPF for 40m)
    Low loss plenum coax, regularly dry nitrogen purged.
    80m OCFD http://www.w8ji.com/windom_off_center_fed.htm @ 80' AGL E-W
    Kenwood TS830S that can't get much closer to it's intended alignment.
    I narrow up the VBT to 2k, slide the IF low (LSB), and compensate with tone.
    I listen through old skool Koss medium impedance headphones (approx 32 ohms)
    Only then do I reach for the attenuator and turn it off and ride the RF gain.

    It's about all I can do, for now. Other than the 40m BPF I'm working on a second 80m OCFD with an adjustable phase coupler to parallel the existing OCFD.
    A random wire tuned vertical. (I have tall trees)
    A horizontal loop. (Yes, I know , mostly NVIS but we all know they have their unexplained moments.)
    Adjustable feed point vertical delta loop
    And
    Microwave link to a mountain 22 miles away that has a significantly lower noise floor.



    I can be heard by numerous stations that I can not hear so the only way I can hear them is to plant an SDR on the hill and pipe it down here. It may seem extreme but I live in random radio frequency noise hell. Kill the grid in the neighborhood and my noise floor drops to atmospheric . Turn the grid back on and it's 4-5S minimum, 6S nominal and 8S not uncommon. So no wonder my attenuator is usually in .

    There is one of those stations that sit right on the cusp of legibility in Central Kalifornia . A good test of my operating skills. There is another in Detroit as well as family in Texas that I am trying to close the gap with. I'm just going to have to science the hell out of this. Isn't that what it's all about ?
     
    Dmans and Shadetree Mechanic like this.

  2. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    How's the noise floor - you mentioned RF gain. You got problems with noisy ballasts feeding the homes around you?

    Good to see you're back!
     
  3. kopcicle

    kopcicle Well-Known Member

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    4-5S minimum, 6S nominal and 8S not uncommon
    Could be anything from pwm to switchers to ballasts.
     
  4. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    woof...
     
  5. OldTech03

    OldTech03 Well-Known Member

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    I actually used one of these when a hospital was destroying my customer's radio and it works when it's set properly.
     
  6. kopcicle

    kopcicle Well-Known Member

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    didn't do anything of mention here ....
     
  7. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    Do you have those creeping Ivy issues? Seems they get around a power pole and literally add a source of arc noise as the ivy drains power off the tension lines as it grows - it gets worse over time too.

    Had that problem at another location - could easily see the "arcs" at night and in some cases - fire department was called in to prevent fire when sparks started to fall off the pole coated in ivy.
     
    Shadetree Mechanic likes this.
  8. SIX-SHOOTER

    SIX-SHOOTER Well-Known Member

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    I have almost ZERO noise on any receiver here or mobile using a ClearSpeech DSP module on all of my radios.I use them on every radio & I never have issues with any noise no matter the time of day or night base or mobile,including HF,CB,VHF,& UHF signals.I am a true believer in their products.I do use the DSP speaker in my mobile. I use beam antennas,vertical,& wire antennas in my shack with the same results. Awesome filters & noise reduction units in my opinion.They have made a believer out of me & several local friends who now also use them after hearing how well they worked for me.

    SIX-SHOOTER
     
    #8 SIX-SHOOTER, Aug 20, 2018
    Last edited: Aug 20, 2018
    Shadetree Mechanic likes this.
  9. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    Everywhere I’ve lived I have been plagued with some sort of noise in my receiver. It’s every single radio I get in the shop so I know it’s the antenna system. I’m at about 50+ feet off the ground and still get it.

    I’m not gonna hijack a thread so I’ll start my own sometime and post some pics. I have ground rods and all, A99 with LMR400. It sucks.
     
  10. kopcicle

    kopcicle Well-Known Member

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    Come on in the water's fine. :)
    It's about "ears" whatever you find or fix holler back here .
     
  11. kopcicle

    kopcicle Well-Known Member

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    [​IMG]
    Mt.Enumclaw (1)
    Latitude 47.263824 °
    Longitude -121.899893 °
    Ground elevation 711.3 m
    Antenna height 10.0 m
    Azimuth 310.12 TN | 294.80 MG °
    Tilt -0.96 °
    (2) Kevin
    Latitude 47.511775 °
    Longitude -122.336917 °
    Ground elevation 133.9 m
    Antenna height 10.0 m
    Azimuth 129.80 TN | 114.34 MG °
    Tilt 0.58 °
    Radio system
    TX power 26.99 dBm
    TX line loss 3.00 dB
    TX antenna gain 28.50 dBi
    RX antenna gain 8.00 dBi
    RX line loss 0.50 dB
    RX sensitivity -113.02 dBm
    Propagation
    Free space loss 135.43 dB
    Obstuction loss 7.14 dB
    Forest loss 0.00 dB
    Urban loss 2.05 dB
    Statistical loss 6.37 dB
    Total path loss 150.99 dB
    Performance
    Distance 42.925 km
    Precision 21.5 m
    Frequency 3300.000 MHz
    Equivalent Isotropically Radiated Power 177.407 W
    System gain 173.01 dB
    Required reliability 70.000 %
    Received Signal -91.00 dBm
    Received Signal 6.31 μV
    Fade Margin 22.02 dB

    [​IMG]

    Game on :) RM33E73C1B3C4_0.gif
     
  12. Rwb

    Rwb Well-Known Member

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    As i told THE REAL PORKCHOP my innertube wifi combo box is nasty noisy.i ran a wire from grond on coax on the wifi box to the fram on my galaxy 99 V .cut half the noise.i yank the plug on the innertube box n its dead quiet.i have grown used to unplugging it but at times i like my radio on n innertube on at same time
     
  13. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    Innertube. Haha. That’s hilarious. My dad called YouTube, youtubes today, that was even funnier.
     
    Rwb likes this.
  14. Rwb

    Rwb Well-Known Member

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    innertube,spider web,
     

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