Thanks for the (important) suggestion. I will make another trip to the hardware store for some rubber sheeting or similar.
Matthew > On Oct 14, 2018, at 4:57 PM, jimlux <[email protected]> wrote: > >> On 10/14/18 4:42 PM, Tom Miller wrote: >> ----- Original Message ----- From: "jimlux" <[email protected]> >> To: <[email protected]> >> Sent: Sunday, October 14, 2018 7:07 PM >> Subject: Re: [time-nuts] Troubleshooting an HP 58503A >>>> On 10/14/18 3:03 PM, Matthew D'Asaro wrote: >>>> All - >>>> Thanks again for all the suggestions and advice I have gotten on this >>>> project. It ran all night without loosing lock, so I am calling it fixed. >>>> There is just one more order of business before I can use it, and that is >>>> some way of "mounting" the GPS antenna on the roof in a non-destructive >>>> manner, both to avoid damaging the (flat membrane) roof and so that I can >>>> move it if necessary. See the attached photo of what I have come up with. >>>> All the parts (minus the cable and antenna) came from Home Depot. >>>> >>>> The concrete block is a generic 1 sqft paver stone which cost all of >>>> $1.18. This is to provide a heavy base and avoid tipping. Attached to that >>>> is an upside-down PVC toilet flange from the plumbing section. It is >>>> attached with 6x stainless steel machine screws and wing-nuts that pass >>>> all the way through the paver and are counter-sunk on the bottom so that >>>> the heads won't damage the roof. Nylon spacers separate the toilet flange >>>> and paver block by about 1/4 inch so that water can drain if needed and to >>>> provide a space for the coax feed line to come out. Pressed into the top >>>> of the paver is a 3" to 2" reducing adapter and pressed into that is a 2" >>>> to 1-1/4" reducing adapter. The mast itself is just a 2-foot section of >>>> 1-1/4" PVC pipe. The 58532A antenna is apparently designed to mount over a >>>> 1-1/4" mast since its inner diameter is 43mm and the outside of a 1-1/4" >>>> pipe is 42mm. >>> >>> >>> Standard "non-penetrating" roof mounts use this technique - they have a >>> frame which you ballast, by bricks, pavers, or sacks of gravel. >>> >>> >>> After that it's more a matter of figuring out how to do the mechanical >>> structure - sandbags and plumbing fittings are a fine way to cobble >>> something to together. >> Don't forget to place a rubber pad under the paver to protect the roof >> material. > > A scrap of carpet, plastic runner, or plywood works well. The carpet gets > pretty gross after a few years, depending on your climate, but it keeps sharp > edges from poking where they shouldn't. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
