I home brewed a switch consisting of 14 relays powered and signalled over the coax line. I put two of these switches in a box outside in the area where the 6 center fed, 2-wire Beverages all cross. T
I also recommend this book. Ma's book has a discussion of calculating the optimum directivity from an arbitrary array by adjusting the element currents and phases. I was able to translate the math in
Chiming some random thoughts: Yes, the W8JI design works great. His web page says 20 feet, but his downloadable eznec file says 25 feet. I compromised at 23 feet because thats the length of 2 12-foot
I used it for my first "temporary" vertical at my new place. After two seasons, many of the radials had become brittle and filled with cracks. Many were broken, probably from being stepped on by deer
I side-stepped the issue by using isolation transformers at both ends of the coax. The in-the-field switch then needs only single throw relays to switch just the hot side of the signal. Don't forget
I did this to my SB220 by cannibalizing an extra switch wafer to move a set of contacts to add 160 along with the other bands. Added an extra set of contacts to throw a relay to add a cap to the load
and from: [CQ-Contest] Using spectrum scopes in contests I have to reply to these messages together, since they are related. Many of you are bored by my numerous soapbox comments about my phased arra
I beg to differ. All 6 of my two-wire Beverages are center fed. Assuming ASCII art works (use a fixed font) this is the feed: ____ ____ ) ( ) ( )______( ) ( ) ( ___) (____ ___ ___ ) ( ___) (___ Where
The two wire Beverage behaves perfectly (as much as anything can be perfect) like a pair of single wire Beverages. The transformers in the middle couple to the coax only the differential mode signal,
I use 1000's of feet of Belden 1829A, which seems to hold up fairly well lying on the ground, so long as the deer don't walk on it. Its nominally CATV "RG6 type" cable, compatible with RG59 F connect
This line from the results is interesting: W6XR S H FN12 112 0 15 97 327 65 WA8GBB 18598 1 21 225 0 WA8GBB must have been portable somewhere. What was his grid square? Its the longest DX in the resul
The northeast end of my 30 degree/210 degree two-wire Beverage terminates about 20 feet (horizontal distance) from the 7200 volt (line to neutral) line that runs along the road at the north end of my
In exchange for greater bandwidth you get lower radiation resistance which for most systems would translate into slightly lower efficiency. Of course, if the increased bandwidth allows you to avoid a
Topbanders: A pipeline company seeks a permanent easement to place about 450 feet of 24 inch ethane pipeline 3 feet underground under my 160 meter Beverage field. Since I live in a "free" country, I
Both carriers peak on my 150 degree Beverage as well. So either the source is far away from me and Tim or my direction finding is lousy. The carriers vary in strength in a pattern that does not seem
Jim: My 160 vertical is a 65 foot Tee (top wires are 70 plus some feet). I added 80 meters with a parallel wire which has to fold back at the top making an inverted L. It works, but the bandwidth is
I had the same frustration calling you at one point and not being heard. I guess the noise levels and propagation are not constant! Thanks for trying! Victor, K1LT _________________ Topband Reflector
Greetings: I was very surprised to find a Stew Perry Topband Distance Challenge plaque in my mailbox. This one says "Top Number QSOs". While only sixth or seventh or something by score, I did have ju
Regardless of the utility of the "DX window", if you call CQ there, you will be plagued by scores of "window police" to remind you not to CQ there. Victor, K1LT _________________ Topband Reflector Ar
Herb was my inspiration for getting on 160 in the first place. Herb spoke at a New England DXCC convention in the early 70s (before I graduated from high school in 1972) and played a recording of som