Cantenna + DWL-120 = unity gain? - Page 4

wrzwaldo · 06-08-2005

Quote:

Originally Posted by Scruge

I'm not so sure I understand why its that important we stay on subject. Getting relevant info from you is like pulling teeth.
You should do a little research on diversity switches to see if it applies. I only saw one antenna. But then again based on the limited info you've provided so far its hard to guess what you are working with.

I thought we had determined which unit it was by the FCC ID #. If this is what his looks like then it has at least two antennas. Of course looking at it I wonder if A1 and A2 are actually connected? I also have to wonder if U8 & U10 make up some kind of bastardized diversity switch.

Scruge · 06-08-2005

Quote:

Originally Posted by Airstreamer

You don't have to. Clean them lightly with some sandpaper and then twisting them together tightly for 1/4" to 1/2" will work. If you really want to stick them together, try a tank of Mapp gas on your basic turbo type propane torch. (One rated for Mapp, though.) Heat just the end of the twist until it fuses together. Mapp will melt copper wire easily, and will even melt small nails made of mild steel. If that doesn't work, find someone with an oxy-acetylene torch set.

Check your setup with boiling water and ice.

(Remember to adjust calibration points based on altitude though.)

You can add sealer and heatshrink it for waterproofing if you want.

Steve

Edit: Howz that for off topic?

Bwawwk! Chicken!

Thanks Airstreamer,
I'll give that a try.

@wrzwaldo

I can't see well enough to follow the traces. You think u8 & u10 could be forming a 3 way ? If so, that could explain the poor performance. He may need to find the RF signal before it hits the switches.

Monitr7 · 06-09-2005

Quote:

Originally Posted by streaker69

If it were a threadjack there surely would have been a Monty Python Quote.

albatross!

Thorn · 06-09-2005

U10 looks to be a three way diversity switch, as the traces for A1, A2 and J7 all seem to converge on it. It looks like U8 is feeding the RF to U10.

U11 seems to be feeding the RF to U10 via U8 and C12 and C155, C154, C153, C84 and T1. That possibly makes U8 some sort of RX preamp, but that's all a SWAG.

Dutch · 06-09-2005

Quote:

Originally Posted by Thorn

U10 looks to be a three way diversity switch, as the traces for A1, A2 and J7 all seem to converge on it. It looks like U8 is feeding the RF to ]U10.

U11 seems to be feeding the RF to U10 via U8 and C12 and C155, C154, C153, C84 and T1. That possibly makes U8 some sort of RX preamp, but that's all a SWAG.

Damn.. Thorn just sank my battleship.. Bastard...

Dutch

Scruge · 06-09-2005

Quote:

Originally Posted by Thorn

U10 looks to be a three way diversity switch, as the traces for A1, A2 and J7 all seem to converge on it. It looks like U8 is feeding the RF to U10.

U11 seems to be feeding the RF to U10 via U8 and C12 and C155, C154, C153, C84 and T1. That possibly makes U8 some sort of RX preamp, but that's all a SWAG.

hmmmm, so if all 3 antennas trace back to u10 how are they being switched if the diversity switch is like this one?
http://www.skyworksinc.com/products_...m.asp?did=1416

Thorn · 06-09-2005

If that is the switch, then U10 and U8 would have to be doubled. In which case it could truth out to one of the following:

((A1 OR A2) OR J7)
((A1 OR J7) OR A2)
((A2 OR J7) OR A1)

Of course, like I said, it's a SWAG (Scientific Wild Assed Guess) based on where I can see the traces in the photos. Not having traced it with any instruments (or seeing a schematic) it's not guaranteed to be accurate. For all I know those vias may go into an internal layer and go to the other end of the PCB.

Scruge · 06-09-2005

Quote:

Originally Posted by MadMax666

Does anyone have more input for the diversity switch question?

Based on what I can tell and input from others, I'd suggest lifting pin 5 on U10 and attaching your coax to c12.

06-09-2005	#49 (permalink)
Thorn Did you do the math? Join Date: Apr 2002 Location: Villa Straylight Posts: 10,084	U10 looks to be a three way diversity switch, as the traces for A1, A2 and J7 all seem to converge on it. It looks like U8 is feeding the RF to U10. U11 seems to be feeding the RF to U10 via U8 and C12 and C155, C154, C153, C84 and T1. That possibly makes U8 some sort of RX preamp, but that's all a SWAG. __________________ Thorn "I'm The Doctor. I'm a Time Lord. I am from the planet Gallifrey in the constellation Kasterborous. I'm 903 years old and I am the man who is going to save your lives and all 6 billion people on the planet below... You got a problem with that?"

06-09-2005	#52 (permalink)
Thorn Did you do the math? Join Date: Apr 2002 Location: Villa Straylight Posts: 10,084	If that is the switch, then U10 and U8 would have to be doubled. In which case it could truth out to one of the following: ((A1 OR A2) OR J7) ((A1 OR J7) OR A2) ((A2 OR J7) OR A1) Of course, like I said, it's a SWAG (Scientific Wild Assed Guess) based on where I can see the traces in the photos. Not having traced it with any instruments (or seeing a schematic) it's not guaranteed to be accurate. For all I know those vias may go into an internal layer and go to the other end of the PCB. __________________ Thorn "I'm The Doctor. I'm a Time Lord. I am from the planet Gallifrey in the constellation Kasterborous. I'm 903 years old and I am the man who is going to save your lives and all 6 billion people on the planet below... You got a problem with that?"

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