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60Ghz devices?

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Tue, 10/08/2019 - 21:50

#1

AE6XE

AE6XE's picture

60Ghz devices?

I noticed there is a 60GHz mikrotik SXTsq lite60 device. I'm not too familiar with these higher bands, but the chipset in this device is the same as the SXTsq lite2, so it may just have an up-converter and the same motherboard. The upper end of the 802.11ad spec in this band is just over 70GHz. This suggests that we may be able to get AREDN/OpenWRT on this device and tweak it up to the 76Ghz - 81GHz ham band. This appears roughly equivalent to selecting ch 7+ in 2GHz, but with the up-converter taking it to the 76GHz ham band.

No guarantees, but if someone sends me one of these devices, I'll play with it to determine the possibilities (in Nov+ 2019 timeframe).

To put in context, the ubiquiti 900Mhz devices are 2GHz chips and motherboards with a down-converter. The 3GHz devices are 5GHz chips and motherboards, with a -2GHz down-converter. This may be more of the same...

Joe AE6XE

Tue, 10/08/2019 - 22:24

#2

K6AH

Limited Link Distances

I haven't run the calcs yet, but the add in Amazon for these suggest links of 200 meters.

Wed, 10/09/2019 - 11:45

(Reply to #2) #3

nc8q

Mikrotik, 60 GHz, PtP

The 200 meter reference is multipoint-to-point where the point is the wAP 60G.
https://mikrotik.com/product/wap_60g_ap
-----

"The effective point-to-point distance between two LHG 60G units is up to 1500 meters..."
https://mikrotik.com/product/lhg_60g
$149 msrp
-----
"it's possible to make point-to-point link with two LHG Lite60."
https://mikrotik.com/product/lhg_lite60
$99 msrp, no PtP distance seen.
-----
"it's possible to make point-to-point link with two SXTsq Lite60."
https://mikrotik.com/product/sxtsq_lite60
$69 msrp, no PtP distance seen.
-----

These may be practical where
you want up to ~400 Mbps,
you have LOS,
the distance is less than 1500 meters (1 mile),
and you do not have access to the land in-between.
:-|

Chuck

Wed, 10/09/2019 - 20:27

#4

K6CCC

K6CCC's picture

Obviously fairly short range,

Obviously fairly short range, and damn near anything will block it (like a halfway decent fog or rain), but could be interesting for high bandwidth in a local environment.

Wed, 10/09/2019 - 20:45

(Reply to #4) #5

AE6XE

AE6XE's picture

The rates will still be 802

The rates will still be 802.11n rates with 2 polarizations/antennas or MCS0 to MCS15 rates. Thus, limited to the same rates we have in 2, 3, and 5GHz bands. The higher throughput 'advertised' is similar to what is achieved with 802.11ac with more antennas and increased bandwidth equivalent to 40Mhz channels in 5GHz.

Joe AE6XE

Wed, 10/09/2019 - 22:02

(Reply to #5) #6

AE6XE

AE6XE's picture

Note, the SXT lite60 device

Note, the SXT lite60 device has the 2/5GHz 802.11n only chipsets inside them. The 802.11ad spec has much higher data rates, so not sure how the higher rates could be implemented with this chipset. A quick google says the true 802.11ad chipsets are very expensive. What we will run into is finding someone with a 70Ghz band spectrum scope to confirm the signal. Anyone have access to such a scope with this capability should we get that far?

As noted, there is no grantee these devices will actually have usable scenarios, given the limited range compared to 5GHz- bands. This is only an investigate to understand possibilities and confirm what usable scenarios exist.

Joe AE6XE

Thu, 10/10/2019 - 02:36

(Reply to #6) #7

AJ6GZ

Yup.

Best use might be between towers or structures on a mountain top without running new lines. But keep them in native RouterOS as a transparent DtD link. I used a pair of wAP60G at a job once for a temporary HD video link at around 100 yards and they worked great. Way less latency and interference than 5Ghz.

Thu, 10/10/2019 - 21:00

(Reply to #7) #8

K6CCC

K6CCC's picture

Good point

You do have a good point about using then for DtD links while leaving them in native RouterOS.

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