Total posts : 45366
There is no need for a third ground pin on the AC source since the unit uses a two prong wall wart.
How do you think I should configure the rf choke pins on the SStran?
Start with them installed. If you get hum or other artifacts, try removing them. Choose the configuration which works best. Also be aware that if the GAIN control is set high you will probably get hum.
Do you think that an 8′ copper pipe would radiate better than a wire?
There will be a slightly more narrow bandwidth with the wire than the pipe but you shouldn’t notice any difference.
Do you think the SStran can tune to it acceptably without the circuit mods?
The only sure way to know is to try it. I found with my unit that the switch settings in the book were a good starting place but got better performance with other settings. If you use a loading coil in the future you will need to make the mods.
How would it change things if I ran a ground strap from the edge of the roof to a ground stake?
If the roof is reasonably large this may not make much difference but there could be lightning safety issues if it is not grounded (and even if it is). Usually, a ground wire from the earth to an “elevated ground” increases radiation but it does so in a way which may not be legal.
At the same time, I really believe that the FCC needs to address the issue of low power broadcasting in a way that allows the average, responsible citizen to have access to an easily licensed way to serve the community even if it takes on a commercial stance.
That would be nice.
Beyond some general comments I have not given much advice. What works here for me may not work for you so it will come down to you trying your different ideas and going with what works best.
Let us know what works and what doesn’t.