Is GPS-00177 compatible with WS-21707?

1

The GPS supplied with WS-21707 works fine.
The problem for me the cable is too long for my application so I ordered the GPS-00177.
I cant seem to get a GPS signal from that GPS.
Any Ideas please ? Specs look the same especially frequency etc etc.

Thanks
Matt

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2

Just for a quick check have a look at the sma connectors feom both antennas, do the look 100% the same, eg does one have a pin and the other one not?

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3

Yes 100% GPS is a male and the SIM is a female so coinnection is good.
Thanks
Matt

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4

The reason i ask is there are 4 sma connector types not just two.

The 2nd antenna states it has a lna which implies it needs power. As such if the gps unit is not providing the needed power it may not work.

Note, I’m just having an educated guess from a very quick read of the specs on my phone, so may be missing something.

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5

Does the original antenna have a part number printed on it?

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6

Hey, no it just states the frequency which is 1575.42MHz and that’s the same as the one just supplied when you check the specs.

Regards
Matt

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7

Cheers. I think wait for one of the core guys to have a look.

To me it looks like the new antenna is active which needs power, but the original is passive and does not need power.

As such unless there is a way to turn on power to the antenna, you may need to find a different one.

Anyway lets see what the experts say.

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8

Hi Matthew,

From a bit of digging it looks like the antenna included with the WS-21707 ( SIM7600G-H M.2 4G HAT for Raspberry Pi includes a passive antenna, though from the schematic there is a biasing circuit for (something? Good catch Michael!) similar to that of the Sparkfun unit. :thinking:

Might be worth an email?

EDIT:

I think the biasing circuitry is not populated on your version of the HAT:

From (your one) SIM7600G-H M.2 4G HAT for Raspberry Pi, LTE CAT4 High Speed, 4G/3G/2G, GNSS, Global Band | Buy in Australia | WS-21707 | Core Electronics :

image
image1693×1234 201 KB

From https://core-electronics.com.au/waveshare-4g-hat-for-raspberry-pi-lte-cat-4-4g-3g-2g-gnss.html:

image
image712×420 95.8 KB

But annoyingly both use the same schematic, a fun bit of sleuthing!

In short, Michael is right (if that area in red isn’t populated on your board)

In short a passive antenna will work: https://core-electronics.com.au/catalogsearch/result/?q=ADA2461%20ADA2460%20

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9

Thank you everyone.

Cheers
Matt

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