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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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    One ship that I was on, GXIC, had a 10 metre vertical whip mounted on the ships monkey island which was about 110 feet above the water line. The base of the whip fed into the auto- ATU for the Skanti TRP-8750 good for 600-750 watts. 1.6 - 30 MHz. The only problem was that on radio-telex the international spec for radio-telex did not require equipment to be able to tolerate the propagation delay if you were the other side of the world, which we often were - New Zealand.  But saying that, I could work BT's Portishead Radio on 12 MHz Radio Telex using that whip with the power set to about 10 watts. Similarly on full power I could trigger Niton Radio's Radio Telex system on around 3 MHz, but never managed a two-way communication; again that was using the same whip and ATU.

    Clive
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    One ship that I was on, GXIC, had a 10 metre vertical whip mounted on the ships monkey island which was about 110 feet above the water line. The base of the whip fed into the auto- ATU for the Skanti TRP-8750 good for 600-750 watts. 1.6 - 30 MHz. The only problem was that on radio-telex the international spec for radio-telex did not require equipment to be able to tolerate the propagation delay if you were the other side of the world, which we often were - New Zealand.  But saying that, I could work BT's Portishead Radio on 12 MHz Radio Telex using that whip with the power set to about 10 watts. Similarly on full power I could trigger Niton Radio's Radio Telex system on around 3 MHz, but never managed a two-way communication; again that was using the same whip and ATU.

    Clive
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