Since moving to my new home and setting up my station I have now taken the time to try and combat the high levels of noise that I and many others suffer.
A few weeks back I was shown a receive antenna by another member of my club who had just installed it at his home QTH.
This antenna is known as a WellGood Loop V3. The PCB’s are produced by George Smart M1GEO and are available here along with the Bias-T Board.
Building the Loop
1x WellGood Loop V3 Pre-Assembled Kit
2x Straight through 20mm Terminal boxes
1m+ 20mm conduit (Additional length required depending on your mounting solution)
2x Bolts (I Used M8)
4x Matching Nuts
2x Ring terminals
4x stand off posts and relevant nuts and bolts
3.14m of Coax (Any coax with a decent braid will be fine)
So time to start building. These are the 2 boards that you purchase from George Smart.
As you can see the amplifier board has cut outs so it will fit nicely in a conduit box and 2 mounting holes to hold it in place. The Bias-T Board also has 2 mounting holes to support the board.
First of all I got the amplifier board position in my conduit box and marked where to drill holes for mounting posts to secure the board. Ensure you get the correct height standoffs to enable the BNC connectors to fit into the bottom opening.
Next was to drill two holes in the side to create some terminal posts for connecting the coax on the outside to the board on the inside.
I then soldered some scrap bits of solid centre core to the PCB and created a small loop in the other end to go round the bolt.
This is the basic install of the amplifier PCB completed all that is needed now is to cut the conduit to create the needed support of the coax loop. Putting the second conduit box in the middle.
I drilled a hole through the top section of conduit to feed the coax through.
After a slight Cut twice measure once issue I ran out of conduit to create the cross bar. to do this I was originally looking for a 4 Way terminal to create the cross but these we not available at my time of purchase so my new plan was to use a step drill to make 20mm holes in the side and feed a length of conduit through. As you will see further down I have temporally zip tied a larger piece of conduit in place.
Now it was just the simple task of feeding the coax through the drilled hole. Stripping back the coating to reveal about 20mm of the braid. I then cut out the centre conductor and crimped on the ring terminals to the braid.
Finally I weather proofed the joints and sealed up the top of the conduit to stop the rain getting in. I have left the bottom opening where the coax exits open to allow for moisture drain and help prevent condensation inside. This was the final step before mounting the loop outside and testing the antenna.
The Bias-T Board
The boxing up of the bias-t board is more of a simple task in comparison.
I started off by drilling two holes 35mm apart in the side face. The step drill i have only had 2mm steps. so 12mm was slightly small but 14mm was a bit big so I would recommend 13mm holes.
After doing this I fitted the board to then use the mounting holes to pilot drill the holes for the mounting posts.
Finally I soldered a power cable to the marked pads and secured it by wrapping it round the mounting posts using them for strain relief. The cable then fed through a hole drilled in the back of the box.
All screwed in place and it was completed. I may add a power LED to the top of the box at some point as the one on the board is now no longer visible.
So currently I have using a 20m HWEF which I need to raise the end of but for the moment it works.
The following images are a comparison of the background noise between each antenna. Received signals are roughly the same strength on both antennas so that makes the Signal-to-Noise a lot better.
Radio Filters Off:
Radio Filters On: