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xlthim
10-06-2009, 10:11 AM
Do you have the radiation pattern for the high power engines with the "F" antenna?
I have a GPS rcvr that is only transmitting about300 yards. When I got to looking at the module itself, I noticed that the engine is mounted (what I would call) sideways.
What would be the "optimum" mounting position?

tks xlthim
admin
10-06-2009, 10:16 AM
Please see this thread for information about antenna orientation.
xlthim
10-06-2009, 10:26 AM
This thread talks about EXTERNAL antennas. We've gotten 16 miles on external antennas.

We have one product that uses the RF100PC6 with the "F" connector. I need the radiation pattern to see if we have a bad mounting idea.
admin
10-06-2009, 10:34 AM
This thread gives some information about ideal F antenna orientation. I'll see what I can dig up about radiation patterns.
xlthim
10-06-2009, 11:00 AM
Tks, that's part of what I was looking for.
Our stem is mounted like the post says. So that means we have a vertically mounted antenna, which matches the 7db antenna we have on the bridge/controller.

Ducks for the external RSMA are usually 3db. What is the gain for the F antenna?

We have RFET with external antenna and we've gone 2 1/2 miles. Should we have the similar expectations from this one? Not quite as good? nowhere near as good?

tks
kbanks
10-06-2009, 03:11 PM
Take a look at the SNAP HArdware Reference Manual (downloadable from here on the forum), particularly at page 8.

It appears that TX Power Amplifier (PA) versus No PA is a big deal (RFET versus RFE), but that F antenna versus External Antenna is not, provided your F antennas are oriented for maximum range.

We're waiting on clearance to post the radiation pattern (some folks are out at customer sites today).

Also note page 14 in the Hardware Reference, where it talks about "keep out" areas.
xlthim
10-07-2009, 08:04 AM
From what we can tell, the antenna is positioned correctly, and the "keep out" area is clear. The housing for this unit is plastic and shouldn't be a problem. We have out of the housing to compare.
If we can get the rain to give us a break, we're going to do some range testing.
kbanks
10-07-2009, 08:54 AM
Synapse RF Engines are based on the Freescale MC1319X radio.

If you need more information that what is provided in the Hardware Reference, you might do a web search for the Freescale App Note, "MC1319X Range Performance". You can find information on F antenna radiation patterns in there.

Here is *A* link for your convenience:

http://www.freescale.com/files/rf_if/doc/app_note/AN2902.pdf