More on the Static Bleed Unit

Returning to this project this morning, having had the night to dream up what exactly I wanted it to do, I decided that it had to do the following -

1. Allow for both ferruled and bare earth wires
2. Allow for bare antenna wire, ferruled wire, coax and 4mm banana plug antenna connections
3. Allow for coax, 4mm banana and ferruled wire connections to radio

I have managed to accomplish all but the ferruled radio connection. I will add this later, but for now ive run out of springy D10 terminals!

 

Internally, a bank of parallel 2W 1.5Mohm resistors form a high power 250k static bleed to ground. 250k is high enough to not affect tuning even on the most temperamental end fed wires, but low enough to quickly drain any static build up. Three extra antenna connectors have been added, so along with the Clansman stud connector, and the BNC socket, there is a 4mm banana plug socket, a screw type insulation piercing terminal and a sprung terminal. For the radio, there are options to connect via coax to the BNC, or 4mm plug. A further sprung D10 terminal will be added once I have some.

View from the side of the antenna terminals.  The BNC antenna socket can also be seen.

Radio end! The SURFs own little coax patch lead and holder remain, but a new 4mm socket allows for single wire connection. This socket was salvaged from an old IF injector and was a bit of a pig to install! 

View from the grounding side. The srpung terminal makes use of the hole forom the SURFs tuning control. Ive left the original meter cover in place, and found a rubber bung left over from something or other fits the hole left by removing the meter perfectly!

And thats it with the lid on! I just need to remove that god awful asset sticker!