[600MRG] 630m to be modified in spring

[Edward R Cole]

ON Nov. 2nd my eme array came down in high winds 
est. > 55-mph.  That also broke a turnbuckle on a 
guy wire and bent my tower over by ten degrees (fortunately did not colapse).

The tower held one end of my 630m inverted-L so 
its on the ground (under the snow) until next 
spring.  Tower was 50-foot but now a section 
shorter. due to bent bottom section.

I decided to only put it back up 30-feet (to hold 
my 2m-eme array) which will no longer work as support for a 630m antenna.

After pondering it for awhile, I decided to put 
up a Tee wire antenna with 130-foot top wire hung 
with 40-feet of vertical wire.  That height was 
selected as the highest level I can reach using a 
man-lift (since I am under Dr orders not to climb 
anymore).  The old inverted-L was only 43 feet so not much difference.

I'm going to re-purpose my 80m inverted-V to use 
as the top wire and feed it with 40-foot parallel 
open wire from a base coil with the bottom and 
top wires shorted together.  I will strap that to 
the existing 50-foot tower (with 10-foot mast) to 
make a folded mono-pole (with top loading by the 
dipole wires.  Dipole ends with insulators will 
be supported by 30-foot push-up masts.  I will 
use some open frame HV relays to provide the 
shorting links for the antenna to work as a 
Tee.  Relays open allow the antenna to be used as 
80m dipole.  Another HV dual-pole relay will 
short the bottom and connect the loading coil 
(relay locations are current nodes so hope not to see high RF voltage).

Diagram:<http://www.kl7uw.com/630mTee.jpg>630mTee.jpg (2040×1540) (kl7uw.com)

I previously ran as WD2XSH/45 with a 100w NDB 
transmitter driven by my Elecraft K3.  The K3 has 
been upgraded with new synth boards  and modified 
gen coverage filter that permit use at 
470-KHz.  I estimated about 4-5w EIRP with the 
inverted-L  The new Tee should work about the 
same.  K3 can operated CW or digital modes.

So, with luck will be back on 630m next summer.

73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com 
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