Thursday, June 1, 2017

Further additions to the Ultimate 3S

I soldered together the accessory relay board today along with a few additional low-pass filters. This converts my U3S from a monobander to a 6-band multibander.

While it may have been easier to build it this way all at once from the very beginning, the addition of the relay board required minimal reworking of the main assembly and so I chose to get the rig working and proven first in its basic configuration before moving on with additions.

Changes to the rig included adding a relay and diode to the main board, clipping two jumpers on the main board and moving the RG174 (RF output) from the main board to the newly installed relay board.

I currently have filter for 10, 15 and 17 meters installed and am WSPRing alternately on 10 and 15 meters. Other filters are waiting to be built.

Sometime during the next few days I will configure the menu to command the U3S to WSPR on 15m and operate QRSS on 10 meters. Each band can be commanded to operate a different mode and there are currently several 10m "grabbers" in Europe and NA listening for just such signals.

Here are a few of them.

The ability to use one of many different modes on any combination of up to six bands make the U3S quite a flexible beacon transmitter, particularly for exploring band openings on the higher bands when we know they are usually closed. Surprises lurk on those "closed" bands more often than you might expect.


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