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Re: AF-5X HD

Not really simultaneous (that would be FDD) but TX on one frequency and RX on another, yes.  Very helpful on longer shots in noisy environments, especially when one or both radios are mounted on high sites, which often 'see' a very different RF environment than what the other end does.

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Re: AF-5X HD

[ Edited ]

I gotcha, thank you. TDD is what I'm used to with Cambium, but I wasn't aware of the differences between this and FDD.

 

I just used the AF5X Link Calculator by ClaudeSS and at 17mi with a 40MHz bandwidth on AF-5G30-S45 I'm only getting a 195Mbps aggregate. Our current Cambium PTP600 link utilizing 30dB antennas is acheiving ~100Mbps over a 15MHz bandwidth. This seems like a pretty paltry improvement. Am I missing something?

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Re: AF-5X HD

You really want bigger dishes for a 17 mile link.  UBNT 34 dBi dishes (real-world gain more like 31-33 dBi depending on frequency) are inexpensive.  If you need bomb-proof 10X, four footers (at least at one end).

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Re: AF-5X HD

@clanderson You should see significantly more throughput on an XHD radio...

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Re: AF-5X HD

Oh? Even with the 30dB dish and 17mi distance? Has anybody determined how well the HD does in high-noise environments? 

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Re: AF-5X HD

The XHD performs significantly better than the 5X in noisy environments.  10X versus 6X on our first link upgrade.

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Re: AF-5X HD

We are currently utiliizing PX2F-52-NXA dishes on our Cambium link. These were about $1200 each when we purchased them; would they be compatible with the UBNT 5XHD? The gain is slightly lower but I'm not sure how else they compare

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Re: AF-5X HD

You can use them
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Re: AF-5X HD


@MimCom wrote:

You really want bigger dishes for a 17 mile link.  UBNT 34 dBi dishes (real-world gain more like 31-33 dBi depending on frequency) are inexpensive.  If you need bomb-proof 10X, four footers (at least at one end).


Just wanted to be sure in the case of 1 bigger dish and 1 smaller the bigger one should be the Master (the one providing the download bandwidth) correct. We might need to do something like that.

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Re: AF-5X HD


@ZeRo-cOol wrote:

in the case of 1 bigger dish and 1 smaller the bigger one should be the Master (the one providing the download bandwidth).


Link gain is a total sum game, so both traffic directions benefit from antenna gain increases at either end.

 

The larger dish will provide better rejection of off-axis interference.  If you are at a very busy site, or there are sources of interference aimed at nearby towers, a larger dish can reduce the amount of interference picked up by the receiver at that side.

 

Structural requirements also drive this decision.  A smaller dish can be mounted higher above ground, or on a lighter duty tower.  It will also dramatically reduce wind loading, which can often help make the decision.

 

There are further subtleties with split RX/TX (different antennas have different gains at different points in the band) and some corner cases with TX power limits that could also push this one way or the other.

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