Equipment for MW-DX
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![]() ![]() Feedbox, equipped with push-down connectors for easy installation. The 470nF capacitor prevents 50Hz balance currents flowing from neutral to ground. |
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![]() The feed cable arriving in the shack has no plug, so you can pull it through small holes during setup. It is then attached to a BNC adaptor and runs through the choke to the phasing unit or directly to the receiver. The choke is a FT114-77 torroid on which RG174 cable is wound (as many turns as possible) giving 900uH. This results in 5000 Ohm @ 1000kHz (2800 Ohm @ 500kHz) that sufficiently attenuates currents flowing on the coax shield of the feed line for MW. Any pickup of signals by the feed line is thus blocked from the receiver input. A nice program calculating inductivity for torroids is here, all data of the common types are already included. ![]() ![]() Termination resistor in a waterproof pill tube. Uses also push-down connectors for screwless setup. |
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![]() This is a two phasor in box unit. I left the old phasor in place and added a new one, in order to try out the new one. The housing was original used for another purpose, hence the odd connectors and labels. ![]() Detail of the resistor termination of the EWE. The ground rod is a 1m threaded 8mm rod thus having a large surface for efficient soil contact. ![]() Pulling a sealed plastic bag over tube and rod ensures good water protection ![]() The same principal was used for the feed box and the screws of the rod. ![]() |
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