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Mounting a SyncPipe

When you get ready to mount the SyncPipe, the first thing you will probably notice is that we didn't include any mounting hardware withthe device. This is intentional. We thought long and hard about what, if anything, to include with the device and after much deliberation we came back to the fact that no matter what we included it would be wrong for a large portion of our customers. As a result, you will need to use a bit of ingenuity based on your specific needs.

The SyncPipe needs to be mounted where it has a clear view of most of the sky. The ideal situation is full 360 visibility from horizon to horizon. A full 360* coverage is not completely necessary. Partial blockage from a tower or other similar object will not significantly affect the quality of the timing signal received. If given a choice (and full 360* coverage was not available), a clear view of the southern half of the sky is preferred due to the location of two geosynchronous GPS satellites are also part of the GPS constellation. (If you're in the southern hemisphere, then the northern sky is preferred).

Positioning on the tower (or other structure) is also important. We recommend you keep any cables carrying timing signals as short as possible. When synchronizing radios via the timing port, the SyncPipe should be mounted fairly close to the radios it will be providing timing to. However, if you intend to utilize a SyncInjector, you should strongly consider mounting the SyncPipe closer to the enclosure or building where you will be installing the SyncInjector, since the timing signal will need to travel from the SyncPipe to the SyncInjector where it is utilized to provide the Synchronization signal.

We also would recommend that you keep the SyncPipe away from strong RF sources. This includes things like two-way radio repeaters, paging transmitters, AM and FM transmitting antennas, and similar. We don't consider canopy radios strong RF sources. The reason for this recommendation is that strong RF can distort thetiming signals and cause synchronization problems. In addition, If the RF is strong enough, it can even prevent the GPS receiver within the SyncPipe from working at all. You should also be careful when routing cables to avoid these strong sources since the RF can also corrupt the signal within the cables.

After you have determined where to mount the SyncPipe, you will need to figure out how you intend to mount it. One simple method is to just use a hose clamp to attach it to a mast of some sort. If you happen to be mounting the SyncPipe on a building, you may want toconsider just using a standard satellite dish mounting arm and use a hose clamp to clamp the SyncPipe to the side of the top of the arm. Some customers have also had good results with mounting the SyncPipe directy on the top of the arm, such that the wires extend down through the arm itself, and the SyncPipe looks like a plastic extension of the arm.

If you are mounting to a tower, you can do something similar with a mast attached to some offset brackets. Regardless of the method you use, we would recommend that you try to mount the SyncPipe such that any metal used to mount the SyncPipe does not extend above the sides of the top cap. Because the GPS antenna is within the rounded top of the cap, any metal nearby may negatively affect the reception of the GPS timing signal.

While we are discussing the mounting of the syncpipe, a brief aside about routing cables *into* the syncpipe enclosure is in order. Each SyncPipe is shipped with a rubber cap. Initially we shipped these caps with a slit cut from one side to the other so cables could be slipped into the cap. This works remarkably well, plus lets water out. However, some customers were uneasy about the size of the gap caused by routing the cable through the cap. As a result, we are now shipping the cap as it comes to us - as one solid piece of rubber. We recommend either a single knife slice across the cap such that you can insert cables through it, or the drilling of holes of suitable size through the cap. Either way, we recommend that you leave at least a small hole such that trapped water (due to condensation or other causes) can drain out of the pipe.