[App_rpt-users] Parallel 900MHz Links

[Bob]

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.keekles.org/pipermail/app_rpt-users/attachments/20140207/2280fdb5/attachment.html>