[Elecraft] NVIS HF vs VHF line-of-sight & CB

[kevinr at coho.net]

One item which rarely makes it onto the ECOM check lists is fitness.  
How many folks are prepared to actually do all the work necessary after 
a major disaster.  The majority of folks would not be able to walk to 
the nearest shelter let alone help others.  We, as a nation, are 
woefully under-prepared for disasters.  The ECOM folks talk about it, 
plan for it, but don't train the public to be in better shape to handle 
any given disaster.  While I have taught many ECOM classes I am never 
allowed to say more than a few words about fitness.  I do it for rehab 
but it has helped me stay safe in the various unsafe times I have had up 
here in the wilderness.

     73 & GL,

         Kevin.  KD5ONS


On 4/30/2017 5:05 PM, Fred Jensen wrote:
> The 1964 Alaska earthquake was a 9.2 centered SSE of Anchorage.  I was 
> at Galena AFS at the time, on the Yukon River in the northern interior 
> just south of the Arctic Circle. It's fairly flat up there and after 
> we realized there was an earthquake, we could watch to the south and 
> it appeared that there were ground waves moving rapidly toward us.  It 
> ultimately broke off the wooden flag pole in front of the chow hall.
>
> The WW2-era wooden hanger and control tower survived just fine, some 
> bookcases toppled and spilled coffee was about all that happened.  The 
> reinforced concrete alert hangars ... not so well. Much of the damage 
> in Anchorage was the result of liquification of the ancient stream bed 
> beneath it.
>
> The effects of any given magnitude earthquake are almost completely 
> determined by the conditions at any given place.  We had a couple of 
> not-high dipoles and one of those humongous LP arrays for the MARS 
> station.  ACS went down, our dipoles worked just fine.  That LP 
> monster is basically a poorly optimized 3 element yagi on any given 
> frequency and didn't work all that well.
>
> Were I in the EMCOMM business and planning for a major widespread 
> disaster situation, I'd focus on the physical aspects of the antennas 
> ... transportability, survivability, ease of deployment, weight, and 
> the like.  The rest will be what it will be, and it will likely be 
> enough ... at least until better can be arranged.
>
> 73,
>
> Fred ("Skip") K6DGW
> Sparks NV USA
> Washoe County DM09dn
>
> On 4/30/2017 4:15 PM, Walter Underwood wrote:
>> Right, an NVIS antenna is effectively a Yagi pointed at the sky. So 
>> put a reflector on the dirt.
>>
>> The Loma Prieta was a 6.9. The Cascadia area could produce a 9.0. 
>> Richter is a log10 scale, so that is 100X as strong.
>>
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ (my blog)
>>
>
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