[HamWAN PSDR] Beacon Tower-Capital Park Backbone Link

Bryan Fields bryan at bryanfields.net
Wed Mar 28 04:59:10 PDT 2018

I would not encourage HamWan Seattle to spend money with a company which has a pending NPRM for removing 10ghz from the amateur spectrum.

They have touted how their found was a former ham and he wrote of how amateurs do nothing with any microwave bands.  

Bryan Fields
M: +1-727-409-1194

> On Mar 28, 2018, at 04:41, Randy Neals <randy at neals.ca> wrote:
> Hi,
> I was digging through the HamWAN Map and Monitoring site to better understand the connectivity and redundancy of the backbone supporting the two key Seattle HamWAN sites, Beacon Tower and Capital Park.
> To recap what I observed...
> Documentation suggests backbone connectivity at Capital Park is:
> a. PtP link to Baldi
> b. PtP link to Paine
> The Capital Park to Baldi PtP actually appears to be a Point-to-Multipoint Link with 2 clients registered on the Baldi radio. I suspect that is Capital Park and Beacon Tower sharing access to a single dish/radio at Baldi.
> The Capital Park to Paine PtP seems to be decommissioned.
> Question: Am I correct in believing that Capital Park is single-threaded with just one backbone connection to Baldi operational?
> Suggestion:
> I think it might be prudent to have a direct PtP link between Capital Park and Beacon Tower.
> The sites are 4km apart with good visual line of sight. These two sites are very important to Seattle users.
> Proposal:
> 24 GHz is both an Amateur Radio band, and an ISM unlicensed band.
> This band works very well on short point to point paths. Further, 24.05 to 24.25 is an ISM band and can carry commercial traffic or amateur traffic.
> 24 GHz could be utilized on the Beacon Tower to Seattle EOC link.
> This link is very short (1.1 Miles/1.7 Km) and is a really good use case for 24 GHz.
> Equipment for 24Ghz is not particularly expensive.
> Mimosa announced a new B24 model on March 6 that has a $729 per end cost for integrated dish/radio. https://mimosa.co/products/specs/b24
> Using 24 GHz to the EOC would allow the repurposing of the 5GHz link intended as Beacon-EOC to be a new backbone path Beacon Tower to Capital Park. I believe there is ample room at Capital Park to add a 2' dish pointing at Beacon. This path is about 4km and would not be suitable for 24 Ghz. 
> The outcome of this proposal would be:
> 1. Seattle EOC-Beacon being linked at very high speed over 24 GHz. (circa 1 Gb/s)
> 2. Beacon Tower-Capital Park also having a high speed 5GHz backbone (circa 100 Mb/s)
> These key sites in Seattle would be less reliant on Gold, Baldi, and Haystack for connectivity within the City of Seattle/across town.
> There is an obvious cost implication for this change, but it's not particularly large and could make the network more robust. I'd be willing to contribute to this and others may also also do the same.
> Thanks for reading this and considering it.
> Randy
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