I remember hearing about these though I'd consider these to be somewhat of an oddity. again why 70cm, only 30MHZ wide & already filled with other users? Why is everyone so damn scared and afraid of moving to the amateur microwave bands where we have 1555MHZ of mostly unused spectrum from 1.2-47.2GHz? Why must we recreate the wheel so much of the time when it may be better, faster, easier, & cheaper to use directly or adapt a solution already in use in another service.
Eric AF6EP
Well, partly because the availability of solutions in other services puts our band in danger.
For example, the presence of WiFi in the 13cm band (we have 2320-2450) already resulted in a ban to use 2400-2450 because of WiFi interference. The same will probably happen on the 5.7 GHz band now that it is becoming more popular for WiFi. 70cm is only 10 MHz here and part of that is already allocated to other services and we are only secondary to them. 1240-1300 we are going to lose when Galileo (the European GPS) is becoming deployed. Only a small segment for DX will probably be left (1296)
The more a band is attractive for other services, the more likely we are going to lose it soon. The much higher bands will remain availble for now, but they are not as attractive.
Rob
On Sat, Jul 6, 2013 at 12:12 PM, Rob Janssen pe1chl@amsat.org wrote:
(Please trim inclusions from previous messages) ______________________________**_________________
I remember hearing about these though I'd consider these to be somewhat of an oddity. again why 70cm, only 30MHZ wide & already filled with other users? Why is everyone so damn scared and afraid of moving to the amateur microwave bands where we have 1555MHZ of mostly unused spectrum from 1.2-47.2GHz? Why must we recreate the wheel so much of the time when it may be better, faster, easier, & cheaper to use directly or adapt a solution already in use in another service.
Eric
AF6EP
Well, partly because the availability of solutions in other services puts our band in danger.
For example, the presence of WiFi in the 13cm band (we have 2320-2450) already resulted in a ban to use 2400-2450 because of WiFi interference. The same will probably happen on the 5.7 GHz band now that it is becoming more popular for WiFi. 70cm is only 10 MHz here and part of that is already allocated to other services and we are only secondary to them. 1240-1300 we are going to lose when Galileo (the European GPS) is becoming deployed. Only a small segment for DX will probably be left (1296)
The more a band is attractive for other services, the more likely we are going to lose it soon. The much higher bands will remain availble for now, but they are not as attractive.
Rob
Again I ask why are the higher bands not as attractive? Readily available COTS Gear is available for 900Mhz, 2.4GHz, 3.4Ghz, 5.7Ghz, 10Ghz, & 24Ghz. We ought to be looking to fill 5.7, 10, & 24 to the point that we can show value in being there. it is our non use of these bands that makes them easy targets for reallocation and takeover. Try reallocating for instance the 2M Band in a major metropolitan city, you'd have an uproar, but the middle microwave bands, easy chicken, egg.
Even the bands where COTS hardware does not generally occupy the chipsets and reference designs are still COTS. really an issue of simply transverting to another band.
Eric AF6EP
Again I ask why are the higher bands not as attractive? Readily available COTS Gear is available for 900Mhz, 2.4GHz, 3.4Ghz, 5.7Ghz, 10Ghz, & 24Ghz. We ought to be looking to fill 5.7, 10, & 24 to the point that we can show value in being there. it is our non use of these bands that makes them easy targets for reallocation and takeover. Try reallocating for instance the 2M Band in a major metropolitan city, you'd have an uproar, but the middle microwave bands, easy chicken, egg.
There is no path. There is no use case...
Prove me wrong. Get with (at least) two of your ham neighbors, build a high speed ring or mesh network on the microwave allocations between your stations. Get the 44 net addresses. Set up gateways. Send us all an email from the ampr.org address describing what you've done...
It should only cost about $1K each node and some hundreds of hours. Then, when it's working - if you do find the paths, there will be endless discussions of what can and can't flow on the system and what keys can or can't be used.
Compare that to Facebook today with a broadband account that just works.
It'll be hard enough getting a path with an ID-1 (price reduced - $710 at HRO) or UDR56K... Then you still have the content and use case issues...
73 Bill, WA7NWP
PS. I can throw out these challenges because I'm working on them. I'm spending the $$ and investing the time to make it happen.
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Bill Vodall -
Eric Fort -
Rob Janssen