[App_rpt-users] Parallel 900MHz Links

[DougH]

Has NVIS been considered?

Doug - GM7SVK

----- Original Message ----- 
From: "Operations - K6ECS" <operations at k6ecs.net>
To: <app_rpt-users at ohnosec.org>
Sent: Saturday, February 08, 2014 5:04 AM
Subject: Re: [App_rpt-users] Parallel 900MHz Links


> Thank you all for your replies. The issue at this point, and I think I
> complicated the question by mentioning LoS, is how to get a parallel link
> when using Allstar. Allstar requires of course access to the Internet or
> Intranet (Ubiquity, etc.). But if the Internet or Intranet go down how can
> we have a parallel network when Allstar is using the I/O's on the Motorola
> MSF 5000?
>
> Talking about it earlier we thought of using a DTMF controller with relays
> or solid state switching to so that we can disconnect Allstar and switch 
> to
> the link system. But is there an easier way? This would be for a last 
> ditch
> effort at maintaining repeater control and linked audio.
>
> -----Original Message-----
> From: app_rpt-users-bounces at ohnosec.org
> [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Brett Friermood
> Sent: Friday, February 07, 2014 12:49 PM
> To: DougH
> Cc: app_rpt-users at ohnosec.org; Bob - AF6D
> Subject: Re: [App_rpt-users] Parallel 900MHz Links
>
> Myself and probably many others would too. Might I suggest getting it
> to the Repeater Builder guys? They are usually very happy to get
> information such as that and can get it on their site for all to see.
>
> Brett KQ9N
>
>
> On Fri, Feb 7, 2014 at 10:03 AM, DougH <specialq.que at ntlworld.com> wrote:
>> Hello Bob es Bob,
>>
>> I would be interested to read the information Bob. Perhaps another
>> consideration might be the use of passive antennas too get round the LoS
>> problem(s).
>>
>> Regards,
>> Doug - GM7SVK
>>
>>
>> ----- Original Message ----- From: "Bob" <kk6ecm at gmail.com>
>> To: "'Bob - AF6D'" <bob at af6d.com>; <app_rpt-users at ohnosec.org>
>> Sent: Friday, February 07, 2014 3:38 PM
>> Subject: Re: [App_rpt-users] Parallel 900MHz Links
>>
>>
>>> Not knowing your particular situation, I offer this experience for your
>>> consideration. We are using a 70cm audio link between two repeaters 
>>> about
>>> 20
>>> miles apart with about a 200m obstruction about half way in between. The
>>> obstruction is a saddle between the mountains that has a well defined
>>> ridge... pseudo knife edge? Turns out this is an optimum condition for
>>> 70cm
>>> with an obstruction, and works quite well. I found an article on the web
>>> written by a couple solders who developed the rules of thumb for this
>>> configuration in the field to get connectivity between sites in the
>>> mountains. I can send it out... not sure if the list can handle an
>>> enclosure, and don't want to stuff it in every ones' email box if they
> are
>>> not interested.
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Bob
>>>
>>> kk6ecm
>>>
>>>
>>>
>>>  _____
>>>
>>> From: app_rpt-users-bounces at ohnosec.org
>>> [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Bob - AF6D
>>> Sent: Friday, February 07, 2014 12:02 AM
>>> To: app_rpt-users at ohnosec.org
>>> Subject: [App_rpt-users] Parallel 900MHz Links
>>>
>>>
>>>
>>> We are finally at the last phase of our build-out with three repeater
>>> locations with minimal overlap. We want to vote and simulcast on 2
> meters.
>>> I
>>> asked how I could get IRLP and EchoLink connected, as well as a weather
>>> receiver and it was suggested that I get an unvoted URI for a controller
>>> (like the RC-210's that we have) and use them to bring in outside
> sources.
>>> That was a great idea! But then it dawned on us that if in the event of 
>>> a
>>> major earthquake or tornado or whatever the Internet would go down - and
>>> those sources too.
>>>
>>>
>>>
>>> This became even more of an important matter because we want to run a
>>> parallel 900MHz link system. We can't use the RC-210 approach because if
>>> the
>>> internet goes down so would our link. The repeaters are too far apart 
>>> for
>>> building our own Ubiquity VLAN - I think. I don't know the maximum power
>>> available at 900MHz and we don't have LOS between the sites.
>>>
>>>
>>>
>>> What are some ideas on getting a parallel link system in case we lose
>>> Allstar?
>>>
>>>
>>>
>>> Thank you for helping me learn.
>>>
>>>
>>>
>>> Bob
>>>
>>>
>>
>>
>>
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