Shack Progress

On June 5, 2009, in Amateur Radio, by TF4M

One operating position is ready – position B which has the control unit for all antennas.   Some work remains, dressing cables, installing computers and building brackets for Bandpass Filters etc.

 

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High Power Rhombic direction Switching

On April 24, 2009, in Amateur Radio, by TF4M

I have a few of these high power relays, but the relay voltage is unknown and it is not marked.

The relay coil measures 10 ohms.

I intend to use them for Rhombic direction switching.

Measurements with a variac revealed that the relay switches around 60 VAC and is comfortable at 110VAC drawing 0.8A without coil heating.

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Rhombic art

On April 23, 2009, in Amateur Radio, by TF4M

I acquired a Philco Construction Handbook on Communications Antennas, dated 1951 on eBay.

Inside is this wonderful drawing.

Completed Rhombic

Completed Rhombic

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