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1

General discussion forum / Re: How Much ACTUAL Bandwidth Needed to support reliable operation

« on: 2013-02-07, 20:10:48 »

Guys, thanks so much for the information. The manual recommends 1.3Mbps for the 2-channel link. I've also spoken with a fellow in our club who maintains the echolink system. And yes, latency is a much bigger problem with SIP. I've worked with wired SIP phones. A frame size of 1500 is pretty big when latency is the bigger issue. It just happens to be the default MTU.

The 900Mhz link would seem to be the better option. With some Yagi antennas, there should be enough gain to burn through the foliage. The distance is trivial.

I'm just praying to the RF gods that I get the location!

best 73

Bill

2

General discussion forum / How Much ACTUAL Bandwidth Needed to support reliable operation

« on: 2013-02-02, 20:28:01 »

Hi All,

I'm hoping to have secured a site on a tall building to put my remote base station and to use this wonderful product. My plan is to get an IC-706MKIIG. Because I want to have the station operational regardless of power conditions for ARES communications, the site I'm trying to get is mostly line-of-sight from my home QTH. I have 2 5GHZ Microtik access points that I used for bridging between 2 buildings a number of years ago. The supply a solid 30Mbps of bandwidth when they are LOS and the firewall is running. A bit faster without a firewall running.

HOWEVER, there is a tree between the building and my condo. The crotch in the tree doesn't have much foliage yet I'm not sure that I can push the 5GHz through it in the summer. So, my backup position is 900Mhz. When examining these systems, the manufacturer says that they pass 1.3Mbps, but from a practical matter, about 984Kbps bi-directionally. With a yagi, these will "burn through" the foliage.

So, my question to the forum is this. Has anyone actually run a test to determine how much bandwidth is actually necessary to have reliable communications? Our manufacturer is recommending 1.5Mbps as a minimum.

If I were to get this awesome location on a 13-story building, I would use the 706 for both HF and VHF/UHF so there could be 2 SIP channels coming back for audio.

***
And for those of you who might need some assistance with networking, firewalls, etc. I'm a computer geek, EE and creative problem solver. I've offered to edit the manual and clean up the English so that it is clearer. Speaking 5 languages, I hope to help out the kind folks in Sweden making the Remote Rig.

Say a prayer for me that I can get back on the air!

73,

Bill