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Station ground/2nd floor
Irv Finkleman wrote:
Why not run two ground wires in parallel -- one twice as long as the other? When one is Hi-Z the other will be Lo-Z and vice versa. That will help on some frequencies but it is akin to trying to erect a 1/2WL fan dipole for all frequencies - can't be done. Sooner or later, you will run into a frequency where length #1 is N*1/4WL and length #2 is (N+1)1/4WL. "It's not nice to fool Mother Nature." -- 73, Cecil http://www.qsl.net/w5dxp |
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Station ground/2nd floor
Cecil Moore wrote:
Irv Finkleman wrote: Why not run two ground wires in parallel -- one twice as long as the other? When one is Hi-Z the other will be Lo-Z and vice versa. That will help on some frequencies but it is akin to trying to erect a 1/2WL fan dipole for all frequencies - can't be done. Sooner or later, you will run into a frequency where length #1 is N*1/4WL and length #2 is (N+1)1/4WL. "It's not nice to fool Mother Nature." -- 73, Cecil http://www.qsl.net/w5dxp OK then, I'll use 3 wires and take my chances! :-) Irv -- -------------------------------------- Diagnosed Type II Diabetes March 5 2001 Beating it with diet and exercise! 297/215/210 (to be revised lower) 58"/43"(!)/44" (already lower too!) -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/index.html Visit my Baby Sofia website at http://members.shaw.ca/finkirv4/index.htm Visit my OLDTIMERS website at http://members.shaw.ca/finkirv5/index.htm -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada |
#3
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Station ground/2nd floor
In article , Irv Finkleman
wrote: Cecil Moore wrote: Irv Finkleman wrote: Why not run two ground wires in parallel -- one twice as long as the other? When one is Hi-Z the other will be Lo-Z and vice versa. That will help on some frequencies but it is akin to trying to erect a 1/2WL fan dipole for all frequencies - can't be done. Sooner or later, you will run into a frequency where length #1 is N*1/4WL and length #2 is (N+1)1/4WL. "It's not nice to fool Mother Nature." -- 73, Cecil http://www.qsl.net/w5dxp OK then, I'll use 3 wires and take my chances! :-) Irv If you are on in a building that has prestressed concrete floors, and coloums, try using the ReBar in the concrete as your RF Ground. When I built my house on a concrete slab, before the pour I brought up a steel strap bonded to the rebar and steel mesh in the radio room. it was a very effective RF Ground clear down to 500Khz. Bruce in alaska -- add a 2 before @ |
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