Coolpad Surf - CP331A

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Didneywhorl
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Re: Coolpad Surf - CP331A

Post by Didneywhorl » Mon Jun 22, 2020 8:21 pm

Give it a go! Usually the amplifiers seem to work best with very narrow spectrums of frequency. Sounds like you got a project! :)
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Whitt
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Re: Coolpad Surf - CP331A

Post by Whitt » Thu Jun 25, 2020 12:35 am

I'm already in the middle of another (unrelated) project, but as soon as it wraps up, I need to get a more reliable signal.

Amp Frequencies: BANDS 04, 05, 13, 17, 25/2

(Up/Down):

698 - 716 MHz / 728 - 746 MHz, 776 - 787 MHz / 746 - 757 MHz, 824 - 849 MHz / 869 - 894 MHz, 1710 - 1755 MHz / 2110 - 2155 MHz, 1850 - 1915 MHz / 1930 - 1995 MHz

Also, the amp is bidirectional, so it amplifies the signal both ways.

parkskier426
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Re: Coolpad Surf - CP331A

Post by parkskier426 » Wed Jul 15, 2020 6:28 pm

So I wanted to try out an external antenna on this thing but based on previously posted pictures, I was pretty sure that this doesn't have an MHF4 connector. After a lot of digging, here's what I've come up with:
  • This type of connector is commonly used during the manufactoring process to measure signal levels to reject bad boards.
  • What's not clear is if this cable would work with this RF switch. Also, I can't find it anywhere for purchase, and it may cost more than it's worth for this project.
What I did notice is that there are two places where the antennas in the caseing is connected to the board, presumably one for wifi, the other for cellular. It should be easy to solder at these points to add on antenna. This is where I'm stuck. There appear to be 3 contact points for the antennas, and I'm not sure what each are. If anyone has expirience here and could shed some light, it would be helpful. I've attached images of the connection points from the board, the case, and what I belive to be the antennas.
MVIMG_20200715_171238.jpg
MVIMG_20200715_171221.jpg
MVIMG_20200715_171431.jpg

shoulin333
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Re: Coolpad Surf - CP331A

Post by shoulin333 » Fri Jul 31, 2020 12:52 pm

I have one of these on the way to see if it works. It should plug on to the "testing port" and allow for external antenna.


https://www.ebay.com/itm/RG174-SMA-FEMA ... 2749.l2649

shoulin333
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Re: Coolpad Surf - CP331A

Post by shoulin333 » Thu Aug 06, 2020 2:01 pm

Update: The pigtail didn't work. The connector is smaller than MS-156. Holding off on digging any deeper right now.

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