Station Grounding

Discussion in 'General Technical Questions and Answers' started by N8FVJ, Oct 12, 2019.

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  1. N8FVJ

    N8FVJ Ham Member QRZ Page

    My radios and amplifier cases are grounded with a 1/4" braded wire. The power supply is not and case does not have a ground connection. Is it recommended to ground the power supply DC out negative lead or case to the station ground?
     
  2. YG8RQN

    YG8RQN Ham Member QRZ Page

    the case should also be ground, to avoid RFI.
     
  3. KD0CAC

    KD0CAC Ham Member QRZ Page

    1st off , unless you have some older gear , all of the items you mentioned are alteady grounded - 3 wire outlets & cords ?
    Adding extra " braded wire " can cause ground-loops .
    My guess is even the power cords may , the length of any / all wires can act as antennas [ unintentionally ] so paying attention to there lengths .
    Then DC - no DO NOT add to grounding .

    If you do have RFI etc. after setting up your station .
    I would strongly suggest looking for the cause / causes 1st / number one [ many times common-mode-current ] and eliminate the cause ---- not coverup , covering up with chokes / whatever - should always be the last resort , usually caused by improper station , or the limitations of building your station .
     
    Last edited: Oct 12, 2019
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  4. KF5LJW

    KF5LJW Ham Member QRZ Page

    What do you have a Station Ground for?. Everything is already grounded. All you are doing is creating a nasty ground loop.
     
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  5. N8FVJ

    N8FVJ Ham Member QRZ Page

    The transceiver and amplifier have a gro
    The transceiver & amplifier have ground screws on the rear panel. They are not there for no reason. As for a ground loop? Ground loops require grounding at both ends to create a loop. A ground loop is not likely grounding cabinets and if the power supply negative is grounded at the transceiver (likely), it is not grounded on both ends creating a ground loop. Of course the power supply DC negative output grounding may not be a good idea.
     
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  6. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Yes, a reason which may be decades out-dated or not applicable to the vast majority of hams with modern three wire electrical systems and proper external safety/surge coax ground. ;)

    Note:
    -The DC power supply is safety grounded through the wall plug. It does not require bonding to other equipment
    -The radios, phased noise eliminator, tuner, amp, antenna switch are already bonded through the coax shield.
    -The coax shield should be bonded to ground through at least an external shack ground rod, and ideally through also through a bonded shack entrance plate.
    -The shack ground rod should be bonded externally directly to the house service panel ground.
     
    Last edited: Oct 12, 2019
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  7. N8FVJ

    N8FVJ Ham Member QRZ Page

    You are saying station grounding is unnecessary and not required now. No ground rod either?
     
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  8. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Re-read. I have completed my edit.
     
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  9. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Final point:

    Grounding radios etc. through both a ground wire, and through the coax shield does create a ground loop. Whether that is a problem remains to be seen. There may be certain situations where it is necessary.

    Most hams who have eliminated the inside ground bonding wire find there are no problems. RF in the shack is generally an antenna/feedline installation problem, not a ground problem.
     
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  10. K7TRF

    K7TRF Premium Subscriber QRZ Page

    In most cases yes. If you do happen to have older rigs with two wire plugs then grounding them makes sense whether that's by replacing their two wire AC cords with grounded three wire cords and tying the ground from the cord to the chassis or by using the ground screws provided by the manufacturer to ground the rigs.
    The ground rod (or utilizing the service entry ground rod) is still important to ground coax shields as they enter the building per the NEC and to provide lightning surge safety with any extra ground rods bonded back to the AC service entry ground.

    But if you have modern rigs in a modern house with three wire outlets there's no real reason to bring a ground wire into the shack from any extra lightning protection ground rods nor a reason to tie all the rigs to that outside ground rod if they're already grounded via the AC outlet.
     
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