Replacing the IO92GQ internet-only repeater
I put a spare end cap into the 800w microwave for a minute, big lump of a thing and it warmed up nicely
Don't know the effect of that on the 1.5 metre long tube with thinner wall.
The cap marked ERA PVC-U 110mm diameter, the tube PVC-U.
Will ask Tim G4WIM what they used on GB3FT, looked like box section down pipe?
I'm thinking my present pipe is rather heavy anyway, so may go for a lighter white PVC pipe and then paint it as per link.
Found useful info here thanks to your input...
https://www.pvcfittingsonline.com/resou ... resistant/
https://www.wickes.co.uk/FloPlast-RPS2- ... m/p/432025
Noel - G8GTZ
Steve G3WGU has used 'helicopter tape' to cover the slots on the wave guide and seal any other openings.
We've not been able to detect any signal loss or de-tuning of either 1.3 or 3.4Ghz slotted wave guide antennas we use on GB3FT and FB.
It's very tough tape and sticks very well, plus it doesn't add any significant weight or windage to the antenna.
Unfortunately the slotted waveguide is 80mm x 30mm so won't fit inside 65mm pvc downpipe, have found another source,
of FloPlast pipe so looks like 80 to 100mm round.
Like Tim's Idea, perhaps we could clear vacuum pack our antennas to show off the engineering.
GB3GQ on the air today for the first time as a repeater, now to iron out the things I missed.
Slotted antenna up without cover, pop on old one if it looks like rain, hope to have new radome by the end of the week.
Did some tests with Pluto on 3.4 down inside the old tube with Hack-Rf as SDR looked ok.
The lid not so good, signal went up when distance adjusted, probably back scattering the signal.
Anyway far too heavy for manual hinge up mast.
- GB3GQ On Air.jpg (100.66 KiB) Viewed 1549 times
As it is 80mm x 30mm and allowing for Right Angle N plug, in the end went for 100 x 100 PVC trunking with end stop.
PVC spacers inside to keep central in tube.
Glued with solvent and sprayed with many coats of acrylic based paint.
100% pass on microwave test.
- New Radome.jpg (71.48 KiB) Viewed 1516 times