Biography

Today, 12/01/2023, I am very happy sharing this feeling of reunion with the HAM community around the world, trhough the QRZCQ services. Since November 3, 2023, at my 70 years old, and already retired, I officially return here as CX7RS, to practice this hobby so dear to me.

In HF, I always communicate from the 13th floor of a building, in Punta del Este. I chose the "Random Wire" of 60 feet in length, which turned out to be the one that best adapts to my conditions, both physical space, and economic.The main drawback that I face is that I must approach my amateur radio activity as if it were POTA or SOTA, since being 43 meters high, to communicate I must extend a rope with a carabiner towards the ground floor and then reach the palisade, to hook the carabiner to it, removing the irradiant from the wall of the building, and tightening it a little (sloper). After completing my communications, I must disassemble the irradiant, and save all these elements until the next radial activity. Just as happens in POTA and SOTA.

I then use the "RANDOM WIRE" antenna, 60 feet long, associated at its end near my 13th floor window, with a UN-UN with an impedance ratio of 9:1, made up of a FT-140 toroidal core, material 43, followed by a common mode RF choke, consisting of another toroidal core identical to the first, where I wound 10 turns of RG-58-U coaxial. After going through the UN-UN, and the common mode RF Choke, I continue with RG-58 U coaxial to the ZM-2 ATU antenna coupler, which gives me excellent results. The "COUNTERPOISE" of the irradiant is constituted by the system of railings in a 10cm by 5cm aluminum profile, which run along the perimeter of my apartment. And like Counterpoise they work very well !!!

This is how I can use this "Random Wire" radiant from the 160 meter band, to the 6 meter band, with SWR values ​​= 1!!! These are the elements that I use to communicate on HF : Transceiver YAESU FT -891 HF + 50MHz, emitting with power limited to only 15 Watts!!! Such a limitation is imposed by the wonderful ZM-2 ATU antenna coupler, and its small and compact components for QRP practices. But I'm not complaining. I enjoy it.

Best Regards, from Punta del Este/Uruguay/South America.
BOB.

Equipment

Yaesu FT-891, in QRP mode (15Watts PEP).
Antenna coupler : ZM-2 ATU.
Antenna: 60' End Fed Random Wire, using UN-UN 9:1 impedance transformer to enable good performance of the antenna coupler.