[MRCA] 40M NVIS - no go

[Robert Flory]

25 feet is fine for NVIS on 40m.  Half wavelength is the bummer height
where you have a null straight up.  25 less than a quarter.

Sounds like you needed to be on 80.

Rob Flory
robandpj at earthlink.net
www.home.earthlink.net/~navyradio  WWII Navy Radio
www.home.earthlink.net/~robandpj    Les Flory Television and Electronics


> [Original Message]
> From: <ersmar at comcast.net>
> To: <mrca at mailman.qth.net>
> Date: 3/19/2006 11:50:52 AM
> Subject: [MRCA] 40M NVIS - no go
>
> Gents:
>
>      When I arrived at the site of the disaster preparedness demo
yesterday, 
> I found that another Ham had already strung up a 40M dipole between to
mil 
> masts on the asphalt -paved parking lot.  We used his skywire all day.
>
>     I believe he had it suspended too high for adequate NVIS work.  My
guess 
> is the center was about 25 feet in the air and the ends were a bit
higher. 
> In any case, 40 was long for us all morning.  I worked SC, MI and NH, but 
> nothing like MD, VA, PA or DE.  There were a few local stations checked
in 
> to ECARS but I couldn't hear them.
>
>     The room we were in (we didn't set up outside) was filled with 
> spectators and others demo'ing their wares (Search Dog teams, horseback
S&R 
> folk, local PD, EMTs, etc.) and the background noise was deafening.  I 
> couln't hear the RX well without turning up the volume and interfering
with 
> adjacent conversations.  Next time I'll bring two sets of headphones: one 
> for me and one for visitors.
>
>      However, I now have about 80% of the NVIS antenna system we
discussed 
> here last year.  I'll construct the 80/60M dipole portion, install it and 
> the 40M kit in the front yard somehow, and report to you gents.  My guess
is 
> that the 80M version might be too long to install at Gilbert in the small 
> grassy square in front of the exhibition hall we typically set up in. 
Any 
> suggestions?
>
> 73 de
> Gene Smar  AD3F
>
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