This is the modem that should be used


#1

I have the dev kit and modem is not so good for Australia, nor others that have been proposed. This has been discussed in other threads in this forum.

A few days ago, I was reading about the Pinephone. It will have a modem soldered in, so confident are they of its range of frequencies for worldwide use. It is the Quectel EG25-G:

https://www.quectel.com/product/eg25g.htm

…great, it supports LTE B28 700MHz, so important for Telstra, our major telco. Is there anything you guys can see that it doesn’t support?

My apologies if this modem has already been mentioned in another thread.


Librem 5 and Australia
#2

I don’t think this will fit, because you can only buy a miniPCIe version, and the Librem 5 will have a M.2 Port.


#3

That maybe is a good global module i.e. one size fits all for the globe-trotting customer - but may be more than needed for Australia.

The Quectel EM06-E is faster, is an M.2 module and I think has all the bands that someone in Australia would need.

https://www.quectel.com/product/EM06.htm


#4

I agree that the Quectel EM06-E looks very promising and as @36w4r6 informed me there is from Quectel already available cheaper (without embedded GNSS) solution: EM05-E that eventually might be as well adequate and good solution for B28 Librem 5 users … if happens that the Librem 5 comes out without LTE Band 28 coverage.
Librem 5 antenna should be suitable (without some limitations) for usage at lower frequency range: 703 – 748 MHz for uplink and 758 – 803 MHz for downlink, isn’t it?


#5

Cat 4 v Cat 6 though i.e. 150Mbps download v. 300Mbps download. In terms of the lifecycle of the module it might be better to have that headroom. It wouldn’t make any practical difference to me today however i.e. in terms of what I could download with LTE right now.

Without embedded GNSS is a good thing regardless.


#6

https://www.4gltemall.com/quectel-em06-lte-cat6-module.html = $199.00
https://www.4gltemall.com/quectel-em05-lte-cat4-module.html = $139.00

As showed with Antenova’s Cat4 LTE Development Kit both of above to be usable on B28 need supportive antenna like Antenova Twin LTE Diversity Antennas: SR4L034-L / SR4L034-R “Inversa”. This was my partial point.


#8

Variant for North America
EM06-A
LTE-FDD: B2/B4/B5/B7/B12/B13/B17/B25/B26/ B29/B30/B66
LTE-TDD: B41 2×CA: B2+B2/B5/B12/B13/B17/B26/B29; B4+B4/B5/B12/B13/B17/B26/B29; B7+B5/B7/B12/B13/B17/B26/B29; B25+B5/B12/B13/B17/B25/B26/B29; B30+B5/B12/B13/B17/B26/B29; B66+B5/B12/B13/B17/B26/B29/B66; B41+B41

This ends all of my concerns pretty much :slight_smile:

Very important for Verizon LTE 13 and 66 bands are there

You made my day ! :slight_smile:


#9

The EM05 doesn’t evidently support VoLTE, whereas the EM06 describes it as “optional”, whatever exactly that means.


#10

Optional
Depending on your provider.
I had some VoLTE devices working on 1 but disabled on others. Has to be about certification and all.
At least that’s my wishful assumption on this modem :slight_smile:


#11

Wow, that is price gouging! The Pinephone has the Quectel EG-25G and the whole phone only costs $150. I bet PINE64 isn’t paying more than $15 for the chip. Putting a chip on an M.2 card doesn’t cost that much. Hopefully other manufacturers will appear.


#12

We would need to see the specs and compare in order to call it price gouging


#13

The link for the specs is above.


#14

Specs for which modem?
Isaw only the m2 ones.


#15

For the EG25-G. In the first post in this thread.


#16

Just saw it. My bad :slight_smile:
However, it won’t open the link.
Page not available

I’ll try another browser


#17

https://www.atestore.de/en/categories/Wireless/Cellular/lte-egprs-nb-1-lte-m1-modules/EG25GGB-MINIPCIE-S.html = 50,00 EUR


#18

Apparently it looks more of a full package compared to the 2.
For us in US it’s lacking band 66 (for VZW) but other than that looks pretty good


#19

Maybe I’m not 100% right, but this is exactly what I understood: Purism as Finished Product Manufacturer! As of Feb 9, 2019 this goes for M.2 modem card as well:


#20

A worldwide chip like the Quectel EG-25G probably costs a dollar or two more than a chip like Quectel EM05 and probably a dollar or two less than the EM06. Considering that PINE64 is manufacturing in small quantities, 4GLTE probably is getting the same kind of bulk pricing on a couple thousand chips at a time. Yes, engineering an M.2 card and fabrication costs something, but I bet that 4GLTE is making over $100 in profit on each M.2 card it sells.

Also consider the fact that UNISOC and MediaTek sell low-end SoCs with integrated cellular modems for $4-5 per chip. Yes, the Quectel chips have an extra heat spreader and come in a more expensive package, but Quectel is charging a lot more than it charges to integrate the same modem in an ASIC, and then 4GLTE is charging a huge amount more just to mount that same chip on a M.2 card.


#21

So first the Quectel EG-25G is a miniPCIe form factor card, we are looking for an M.2 card. The M.2 spec is a little different - smaller and less power consuming.

Then also if you look at other modem please look carefully if they also support voice and if yes, how they do it. Last year when we started doing research there were almost no ready-made M.2 modem cards available that supported voice - but for a phone I guess this is an important feature?

Lastly when you look at bare chips please do not forget that you can not simply 1:1 compare a complete pre-qualified modem module with the bare chips. There is a lot more to go into a modem module than just the silicon parts - like the bespoken qualification, testing and not to forget patent licenses. The 3GPP 4G patents are way over a thousand from several hundred patent holders. A huge amount of money from the modem module price goes into these licenses. The basic rule of thumb is to set aside about 20% of the sales price of a cellular device for patent royalties.

The cellular market is a battle field full of booby traps.

Cheers
nicole