[HamWAN PSDR] How to Aim Uplink on a Tower

Tom Hayward tom at tomh.us
Sat Feb 1 10:02:06 PST 2020

I have never heard of Aim Master.

The Mikrotik command to learn OIDs is "print oid". Example:

[tom at Baldi.Crystal] /interface wireless> print oid

 0 tx-rate=.
strength=. ssid=


[tom at Baldi.Crystal] /interface wireless> registration-table print oid

 0 signal-strength=.


tx-rate=. rx-rate=






Once you have found enough signal to maintain a connection, exit out of
scan and use mon for much better data. It will show you both chains.

[tom at haystack.evergreenmonroe] > /in wi mon 0

                  status: connected-to-ess

                 channel: 5880/10/an

       wireless-protocol: nv2

                 tx-rate: 43.3Mbps-10MHz/2S/SGI

                 rx-rate: 52Mbps-10MHz/2S

                    ssid: HamWAN

                   bssid: 6C:3B:6B:5D:5E:17

              radio-name: Haystack-S3/K7WAN

         signal-strength: -67dBm

     signal-strength-ch0: -69dBm

     signal-strength-ch1: -71dBm

      tx-signal-strength: -68dBm

  tx-signal-strength-ch0: -71dBm

  tx-signal-strength-ch1: -71dBm

             noise-floor: -118dBm

         signal-to-noise: 51dB

                  tx-ccq: 80%

                  rx-ccq: 79%

   authenticated-clients: 1

        current-distance: 22

                wds-link: no

                  bridge: no

        routeros-version: 6.46




     notify-external-fdb: no

Practice on the ground if you've never done it before.


On Wed, Jan 29, 2020 at 5:52 PM Kenny Richards <richark at gmail.com> wrote:

> I have not used the Aim Master, but I would be surprised if it isn't
> operating off the same data being provided by the scan. As someone who has
> done a fair amount of the tower work, you really don't want to have them
> trying to manage anything additionally like watching a display.(regardless
> of what display) That is why having the pre-defined interactions between
> the ground person (who can completely focus on the data) and the tower
> person is the best solution.
> On Wed, Jan 29, 2020 at 4:53 PM Herb Weiner <herbw at wiskit.com> wrote:
>> Thanks, Kenny. This is the same technique we have used (except without
>> the HTs) when we are setting up a dish on a tripod, but I was really hoping
>> that there was a better way. And it is quite possible that the tower
>> climber will have experience with this. At this point, we don't know who
>> the tower climber will be, since KOIN requires that we use climbers
>> approved by them.
>> I agree that scan sucks. Also, for aiming, an analog display really would
>> work better than a digital display. That is why I was hoping that I could
>> get Aim Master to work. (If anyone can tell me what some suitable SNMP OIDs
>> for aiming an antenna, I will try to update Aim Master. Perhaps this would
>> be a better solution.)
>> Herb
>> On Jan 29, 2020, at 4:32 PM, Kenny Richards <richark at gmail.com> wrote:
>> Herb,
>> The approach which has always been used when I have been involved uses
>> the output of /interface wireless scan 0, but it really requires two
>> people.
>> 1) person on tower preps the dish and does their best to aim it in the
>> right direction. They report to ground (usually via a HT) that they are
>> ready.
>> 2) person on ground that is logged into radio, issues the scan command.
>> 3) The ground person at this point is in control and should be doing
>> almost all the talking. (which is good, because the person the tower needs
>> both hands aiming the dish)
>> 4) ground person reads the signal level, whether they see a connection or
>> not, etc. They need todo this continually, because the person on the
>> tower is completely operating on what they are being told. This means you
>> keep swing in one direction until the ground person tells you to stop and
>> go back the other direction.
>> 5) remember that you will need to adjust horizontal and vertical
>> multiple times to fine tune the signal.
>> 6) also remember the scan sucks and will 'stop' updating when it looses
>> the signal.
>> 7) the tower person has to try and go as slow and steady as possible when
>> adjusting.
>> If you are using a professional tower climber, get a set of FRS radios or
>> something to send up with them. I'd be surprised if the pro's haven't done
>> this general alignment before, but that is just a guess.
>> Kenny
>> On Wed, Jan 29, 2020 at 1:53 PM Herb Weiner <herbw at wiskit.com> wrote:
>>> In the near future, Oregon HamWAN (http://www.oregonhamwan.org) will
>>> be deploying three sectors and an uplink (aimed at Larch Mountain) on the
>>> KOIN Tower in Southwest Portland.
>>> What is the best way to optimize the aiming of our uplink? I am familiar
>>> with the use of /interface wireless scan 0, but it is difficult to
>>> optimize the signal strength using the output of this command.
>>> Aim Master (https://github.com/HamWAN/aim) looked like a promising
>>> approach, but it appears as if this has not been updated since 2016, and it
>>> appears to use SNMP MIBs that are no longer supported by the current
>>> firmware.
>>> We need to provide instructions for a professional tower climber that
>>> will probably have limited, if any, experience with HamWAN.
>>> Thanks for your suggestions.
>>> Herb, AA7HW
>>> _______________________________________________
>>> PSDR mailing list
>>> PSDR at hamwan.org
>>> http://mail.hamwan.net/mailman/listinfo/psdr
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