We mostly avoid DFS frequencies on APs because of the impact if we get false
radar detects. Also we are mostly a Cambium shop. So I'm a bit confused
about DFS on other vendor equipment like Ubiquiti as well as home routers.
Question 1 - what happens when there's a DFS detection? On the Cambi
-
Mike Hammett
Intelligent Computing Solutions
Midwest Internet Exchange
The Brothers WISP
- Original Message -
From: "Ken Hohhof"
To: "AnimalFarm Microwave Users Group"
Sent: Thursday, November 21, 2019 1:16:54 PM
Subject: Re: [AFMUG] dumb DFS question
2:30:05 PM
Subject: Re: [AFMUG] dumb DFS questions
I thought Military aircraft radars could also use DFS frequencies?
On 11/21/2019 09:50 AM, Kurt Fankhauser wrote:
> We are using DFS on PMP450 for customer access and AF5XHD for backhauls.
> It works surprisingly well. On both the PMP450
Gotta love those guys popping up trying to out sell the 10yr veteran LOL!
Been there done it twice in 15 yrs
On 11/21/19 10:31 AM, Ken Hohhof wrote:
We mostly avoid DFS frequencies on APs because of the impact if we get
false radar detects. Also we are mostly a Cambium shop. So I’m a bit
c
180 second wait on a detect, i believe. so it waits the 180 before
transmitting initially, then if there is a detection it waits to hop. the
4.4.2 firmware is really sticky on your alternate channels, it wont let you
save them if you dont have the required separation (no to 2.5 or 5mhz) DFS
is real
Yeah I think on most equipment you can set alternate channels that are
just shifted over 5mhz from where you were. And yeah I think the
channel needs to be clear for a few minutes before you can go back to it.
Assuming you don't really have a TDWR near you, I don't think DFS events
are that b
...and if Belkin did it wrong, who would know or care?
On 11/21/2019 11:41 AM, Steve Jones wrote:
180 second wait on a detect, i believe. so it waits the 180 before
transmitting initially, then if there is a detection it waits to hop.
the 4.4.2 firmware is really sticky on your alternate channe
even if
they did, I am sure they are re-using the same frequencies and not just sliding
around in a band. Maybe the are?
From: Adam Moffett
Sent: Thursday, November 21, 2019 9:55 AM
To: af@af.afmug.com
Subject: Re: [AFMUG] dumb DFS questions
Yeah I think on most equipment you can set
6 dBm loss for the AP transmit isn't the end of the world. It's the up to
23 dBm loss on the SM transmit power that destroys the usefulness of DFS
for PTMP past a couple miles. The ~16 dBi gain 90° sectors 2-300' up in
the air just can't hear those SMs over all the noise they are picking up.
What
There might be something I don't understand, but I thought you had flat
EIRP limit of +30dbm whether it's an SM or an AP.
On 11/21/2019 12:11 PM, castarritt . wrote:
6 dBm loss for the AP transmit isn't the end of the world. It's the up
to 23 dBm loss on the SM transmit power that destroys the
We don't like our APs jumping channels, and we have too tight of a
channel plan to have "extra" channels available. We lock our APs to the
DFS frequency.
If a detection happens (true or false) the AP shuts down for 30 minutes
and then will sense and fire back up if the source is gone. Almost
You do.
On 11/21/19 12:27 PM, Adam Moffett wrote:
There might be something I don't understand, but I thought you had flat
EIRP limit of +30dbm whether it's an SM or an AP.
On 11/21/2019 12:11 PM, castarritt . wrote:
6 dBm loss for the AP transmit isn't the end of the world. It's the up
to 23
s which are all above 10 GHz.
From: AF On Behalf Of ch...@wbmfg.com
Sent: Thursday, November 21, 2019 11:02 AM
To: af@af.afmug.com
Subject: Re: [AFMUG] dumb DFS questions
I would think you can do a frequency search on radar in the area and simply
shut off those frequencies. I have neve
We are using DFS on PMP450 for customer access and AF5XHD for backhauls. It
works surprisingly well. On both the PMP450 and AF5XHD's you can set an
alternative freq and a secondary alternative for the radios to immediately
jump to if they detect RADAR. Radios will try the first alt freq and if
they
nna gain to exceed the AP limit of 36 dBm EIRP (subject to OOBE limits).
From: AF On Behalf Of Adam Moffett
Sent: Thursday, November 21, 2019 11:27 AM
To: af@af.afmug.com
Subject: Re: [AFMUG] dumb DFS questions
There might be something I don't understand, but I thought you had flat EIRP
BE
> limits).
>
>
>
> *From:* AF *On Behalf Of *Adam Moffett
> *Sent:* Thursday, November 21, 2019 11:27 AM
> *To:* af@af.afmug.com
> *Subject:* Re: [AFMUG] dumb DFS questions
>
>
>
> There might be something I don't understand, but I thought you had flat
>
>
>
> *From:* AF *On Behalf Of *Adam Moffett
> *Sent:* Thursday, November 21, 2019 11:27 AM
> *To:* af@af.afmug.com
> *Subject:* Re: [AFMUG] dumb DFS questions
>
>
>
> There might be something I don't understand, but I thought you had flat
> EIRP limit of +30dbm
imit of 36 dBm EIRP
(subject to OOBE limits).
*From:* AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Adam Moffett
*Sent:* Thursday, November 21, 2019 11:27 AM
*To:* af@af.afmug.com <mailto:af@af.afmug.com>
*Subject:* Re: [AFMUG] dumb DFS questions
There might be so
> use antenna gain to exceed the AP limit of 36 dBm EIRP (subject to OOBE
>> limits).
>>
>>
>>
>> *From:* AF *On Behalf Of *Adam Moffett
>> *Sent:* Thursday, November 21, 2019 11:27 AM
>> *To:* af@af.afmug.com
>> *Subject:* Re: [AFMUG] dumb DFS questio
On Behalf Of Kurt Fankhauser
Sent: Thursday, November 21, 2019 12:04 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] dumb DFS questions
one thing i have always wondered is do the SM's actually look for RADAR or only
the AP's?
On Thu, Nov 21, 2019 at 12:55 PM
blank
for perhaps 50 mS.
If I had more ambition I would ask for an experimental license to play with the
idea.
From: Ken Hohhof
Sent: Thursday, November 21, 2019 11:11 AM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] dumb DFS questions
Only the APs, at least under
spectrum.
http://www.wispa.org/Resources/Industry-Resources/TDWR-Resources/TDWR-Locations-and-Frequencies
From: AF On Behalf Of ch...@wbmfg.com
Sent: Thursday, November 21, 2019 12:16 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] dumb DFS questions
Those ra
think
the antenna had 60 dB gain. The tx power was in the kW range.
From: Ken Hohhof
Sent: Thursday, November 21, 2019 11:36 AM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] dumb DFS questions
Chicago has 2 TDWRs (for OHare and Midway) and both are in the 5600-5650
ubject: Re: [AFMUG] dumb DFS questions
Yeah I think on most equipment you can set alternate channels that are just
shifted over 5mhz from where you were. And yeah I think the channel needs to be
clear for a few minutes before you can go back to it.
Assuming you don't really have a TDWR ne
y, November 21, 2019 12:36:28 PM
Subject: Re: [AFMUG] dumb DFS questions
Chicago has 2 TDWRs (for OHare and Midway) and both are in the 5600-5650 MHz
band. I think a lot of WISP equipment actually locks out those frequencies, and
the only place a WISP would be desperate enough to use that
Mike Hammett
Sent: Thursday, November 21, 2019 1:05 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] dumb DFS questions
This is nowhere near complete, but here is a map I've been building of radar
sites.
https://drive.google.com/open?id=1ayAnN9KSq09zKS8WCqaQ_QA3JrY
&
. So if ULS says the frequency is 2900-2950, that means the
> actual radar beam is in that range? Not in 5 GHz at all?
>
>
> From: AF On Behalf Of Mike Hammett
> Sent: Thursday, November 21, 2019 1:05 PM
> To: AnimalFarm Microwave Users Group
> Subject: Re: [AFMUG] dum
I thought Military aircraft radars could also use DFS frequencies?
On 11/21/2019 09:50 AM, Kurt Fankhauser wrote:
We are using DFS on PMP450 for customer access and AF5XHD for backhauls.
It works surprisingly well. On both the PMP450 and AF5XHD's you can set
an alternative freq and a secondary
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