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Earthing and the radio amateur

Stewart Mason
I've recently joined the IET forums. I replied to a  topic regarding amateur radio and PME on the old forum. Unfortunately I cant access the old forum anymore so I thought it would be best to start a new topic.


So. On the bench there is a transceiver with a metal case. Next to the transceiver there is a antenna tuning unit which is connected to a antenna system which is using an earth rod. Am I right in saying there is a chance of a potential difference between the two metal cases of the equipment regardless if it is a TT, TNS or TNCS?


What would be the ideal solution?  Put the shack on it's own TT supply and bond all the radio equipment back to the MET of the TT and if a earth rod is used for the antennas connect that back to the MET also?


If the TT system was not an option what would be best if the supply was a PME and you didn't want to use balanced antennas removing the use of an earth rod? 


To be honest I've never really given PME's and amateur radio much thought which in hindsight was probably a mistake. I do remember when I did my training an earth rod was recommended for the radios.


Apologies for being so random.


Stewart M0SDM
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  • Former Community Member
    0 Former Community Member
    Thanks for the reply Andy.  After I had posted, it had suddenly dawned on me that the two earth systems would still be within reach of each other!  My thought was that with the radio supply mains being fed through an isolation TX it would be a safer option.  Also, it means that the aerial system, which is connected to the radio, has its own earth stake and I did not want to have any link to the noisy PME earth.  An rf filter in the mains feed to the radio would rf isolate from the house wiring.  The radiator is 4 feet from the radio.  The radiator, which is on the central heating boiler system, could be boxed in?  To make things a little clearer,  Isolation TX fed from house ring.  Ring main earth removed from TX outlet socket.  Line fed from TX via rf filter to radio.  Metal work at station earthed to aerial system?

    Mike.
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  • Former Community Member
    0 Former Community Member
    Thanks for the reply Andy.  After I had posted, it had suddenly dawned on me that the two earth systems would still be within reach of each other!  My thought was that with the radio supply mains being fed through an isolation TX it would be a safer option.  Also, it means that the aerial system, which is connected to the radio, has its own earth stake and I did not want to have any link to the noisy PME earth.  An rf filter in the mains feed to the radio would rf isolate from the house wiring.  The radiator is 4 feet from the radio.  The radiator, which is on the central heating boiler system, could be boxed in?  To make things a little clearer,  Isolation TX fed from house ring.  Ring main earth removed from TX outlet socket.  Line fed from TX via rf filter to radio.  Metal work at station earthed to aerial system?

    Mike.
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