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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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  • 0
    Mike (MAP)


    I have a roll of 10mm on the shelf I was thinking of using but did not know whether to strip it or not? I thought the larger the CSA the wider the bandwidth but didn't squat when compared to a bird cage dipole.


    Mike (D)


    I am very interested in your end fed. I have a 9:1 Unen I had thought of using but was unaware of a 49:1, what made you choose this?


    i have found an HF line choke on EBay with a SO239 on each end. Is this what you used? Did you just connect on to the co-ax braid for the earth connection to your electrode on the TX.  Side of choke?


    What choke did you use for connection to the installation earth?


    My Kenwood transceiver has a built in ATU does your TX. have an inbuilt ATU or not hence the auto ATU?


    How does the aerial perform on 5 MHz?


    Why 20.1 m length? That appears to be 1/2 wave at 7MHz?


    Sorry a lot of questions there?


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  • 0
    Mike (MAP)


    I have a roll of 10mm on the shelf I was thinking of using but did not know whether to strip it or not? I thought the larger the CSA the wider the bandwidth but didn't squat when compared to a bird cage dipole.


    Mike (D)


    I am very interested in your end fed. I have a 9:1 Unen I had thought of using but was unaware of a 49:1, what made you choose this?


    i have found an HF line choke on EBay with a SO239 on each end. Is this what you used? Did you just connect on to the co-ax braid for the earth connection to your electrode on the TX.  Side of choke?


    What choke did you use for connection to the installation earth?


    My Kenwood transceiver has a built in ATU does your TX. have an inbuilt ATU or not hence the auto ATU?


    How does the aerial perform on 5 MHz?


    Why 20.1 m length? That appears to be 1/2 wave at 7MHz?


    Sorry a lot of questions there?


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