I will retrieve the auto tuner in the next few days - before the next round of rain - and put it on the AR bench in the ELab.
I would highly recommend against taking a group of members up on the roof and walking across the are above the new area. It will cause insulation to rain down - especially in the back area. If you’ve been over there and looked up, you know what the problem is.
We do have a place to run a ground strap(s) out to a ground rod(s) in the standpipe closet.
Ditto what Art says.
Pole is in good shape. The base needs straightening/reinforcement - just like last time.
ELab will NOT have 220/240v service.
On my calendar.
Count me in too
Don’t think that is a trap dipole. The three wires on each side of the feedpoint, and you know - the lack of traps - kinda points heavily towards a fan dipole. The items between the wires in some of Art’s pics are spacers.
And for future consideration, there are trees at the end of the building on the north side of the building. Right outside the new ELab. Wire antennas or other things in those trees might be an option.
The reason I’ve suggest a mag loop is that even a big one is low profile enough to not be visible from the street. If we have problems because of mast height, it’s something to consider. I think we have the tools. We’d need to find a vacuum variable cap for it and a stepper for tuning. A small rotor under the base lets you aim the nulls towards noise if needed.
Anything that can be visually hidden by the trees is going to be a big plus - not necessarily in the trees, but obscuring line of sight from the ground.
Fabricating the loop itself will be the “fun”. Forming 1" or larger tubing into a loop 6 feet in diameter is a challenge.
We’d have to take up a collection to buy the caps.
Will put it on the list and be on the lookout for parts.
That would make sense. 10m and 20m as separate elements and then traps on the 40m element to get 80m. I assumed the things at the end of the long element were insulators. Not enough resolution in any of the pics to tell.
I’ll try to be there for a while Saturday morning. 2nd Saturday again, so I have an afternoon commitment.
Having built one of these and compared it to the one made by harris, they are night and day. Magic it is not 
I don’t want to high jack this topic, so mods please move if necessary.
Is there any interest in mounting a
LoRa antenna?
Not that the goal would be 20-Kim or even 2-km, but it would be educational.
As part of expansion committee, I’m going to go ahead and ask y’all to limit the number of people on the roof to no more than two. Having been up there more times than I would like recently, I know there is work to be done on the antenna, and I have no issues with that.
That being said, we’ve found a number of leaks in 102 that have become a real PITA, as far as the move is concerned. We’re having these issues addressed, but in the mean time, please keep the number of volunteers to an absolute minimum.
Oh, and it doesn’t matter where you walk. The edges leak just as badly as the middle.
I think this would be better postponed until a plan has been formulated.
What size/voltage/type of caps do you need?
I’ll have to dig up my notes, but as I recall the values are 10-500 pF, 15-25KV vacuum variable.
There is a very high voltage across the cap during transmit. The other fun part is there is a very high RF current in the loop, so 1" or bigger copper or aluminium is ideal. Minimum resistance in any joints is also important.
Since you want to use a loop that is < 0.1 wavelength, two loops is the solution I’ve been working on. One about 3 feet in diameter for 10-20m, and one 6 feet in diameter for 40-80m.
Here’s a good site for info:
https://www.nonstopsystems.com/radio/frank_radio_antenna_magloop.htm
You have a PM with a probable source.
Tomorrow still on?
Isn’t there a device in the metal shop specifically for doing this?
Yes we have the Horror Freight roller. It should do 1” no problem. Worst case you can bump bend 1 1/4” od Tube