With the SIAE radio:
- 2+0 XPIC - minimal loss using the built-in OMT branching unit on the
order of 0.5 dB per end
- 2+0 ACCP - 3.5 dB loss per end using the built-in Hybrid branching unit
No TX power back-off required in either mode, nor do you need to back-off the
TX power when using POE.
The ALFOPlus2XG radio has independent modem & RF, so there is flexibility on
how you could setup each radio. Each carrier can have its own channel bandwidth
& modulation.
The branching units are field changeable and allow the ODU to bolt directly to
the back of the antenna.
Thanks,
Joe Schraml
VP Sales Operations & Marketing
SIAE Microelettronica, Inc.
+1 (408) 832-4884
[email protected]
www.siaemic.com
>>> Mathew Howard <[email protected]> 1/4/2021 12:01 PM >>>
Yeah, you can do 2 x 80mhz channels with a single core on some radios, but
there are some limitations. Depending on the radio, my understanding is that
they have to either be adjacent, or very near each other (definitely within the
same sub-band). It seems to me that some radios can even do two different sizes
of channels (like 1 80mhz + 1 40mhz), but I could be remembering that wrong. If
I understand it right, the Aviat radios have a significant tx power hit when
you activate that feature, which probably makes it unusable in a lot of cases.
We're doing that on a Bridgewave 11ghz link (using 4x 80mhz on a dual core
radio), and there's it works fine, with only a minor performance hit on those
radios. SIAE does have that feature as well, but I don't remember if there was
a significant performance hit or not... I think they may have been the ones
that could use two different sizes of channels.
On Mon, Jan 4, 2021 at 1:51 PM Ken Hohhof <[email protected]> wrote:
Probably, LinkPlanner is pretty smart.
I assume you don't want to use 2 antennas.
There are some licensed radios now that I think can do 2 x 80 MHz channels in
a single core, like from Aviat or SIAE maybe, I don't know if this gets around
the splitter cost and performance issues. I may have that feature completely
wrong, I haven't looked into it. There could also be a performance hit by using
the same xmt power amp for 160 MHz.
I also haven't checked out the full feature set of the new PTP850C, the only
thing I know it has is SFP+.
---- Original Message ----
From: "Adam Moffett" <[email protected]>
Sent: 1/4/2021 1:30:45 PM
To: [email protected]
Subject: Re: [AFMUG] 2+0 Co-Polar
Ok yeah, the Link Planner BOM shows some splitters. I wonder if Link
Planner already accounted for the additional losses when I selected "Co
Polar" on the dropdown.
On 1/4/2021 2:25 PM, Ken Hohhof wrote:
> I seem to remember that different channel different polarization is the
> best, if your radio manufacturer charges for an XPIC license key. Next best
> is XPIC. And that the problem with different channel same polarization is
> you need a splitter which costs several dB of system gain. But that's from
> memory, and mine is not so reliable.
>
> ---- Original Message ----
> From: "Adam Moffett" <[email protected]>
> Sent: 1/4/2021 1:16:26 PM
> To: "AnimalFarm Microwave Users Group" <[email protected]>
> Subject: [AFMUG] 2+0 Co-Polar
>
> I'm looking at a path where the coordinator can get me two 50mhz XPIC
> channels, or two 80mhz H-Pol channels.
>
> I've never installed co-polar. Do you need a lot of extra junk to make
> that work?
>
>
>
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