| Topic |
Author |
Posted On |
| Tune 40 m dipole for Tech QRP CW |
WA1UKG |
on 10/12/12 |
New tech (soon).
Now that I have my 40m dipole up, I need to tune it. What QRP CW frequencies can I expect to work the most? I'm looking for a frequency to tune the antenna to. |
| Practical use of antenna, tuner, etc by new tech |
WA1UKG |
on 6/11/12 |
| Is it acceptable practice to let some extra wire hang down from each end of the antenna to make pruning easier (or maybe add some wire without unwrapping the existing)? I recall reading somewhere about someone that added quick connects to make changing frequencies easier by using different lengths of dangling wire.. |
| Practical use of antenna, tuner, etc by new tech |
WA1UKG |
on 31/10/12 |
| After a lot of head scratching, talking to myself, and just generally loosing contact with my surroundings, I decided that the best installation is probably the simplest. In my front yard, next to the road, is a 25 ft palm tree. 69 ft from the top of the palm tree (straight shot) is the peak of my house. I will hang a 40m dipole without a balun between the two. I will be using CW on 40 and 15m. QUESTION: If the ends of the wire are insulated, should my resonant length calculations include the twisted wire attached to the end insulators? To insure the wire not coming loose I expect to twist at least 6 or 8 inches (each end) thru the insulator back around the primary wire. If the wire is bare is it then just the distance to the end? |
| Practical use of antenna, tuner, etc by new tech |
WA1UKG |
on 23/10/12 |
| By using some fascia boards from adjoining areas I can get at least 70 feet strung up on the side of my house. If a 40m dipole has one or more 90 deg bends at the ends of a "mostly" straight 50 foot section of the antenna, how will that affect the operation? Will I have to add or subtract wire? (shaped sort of like this> ____/``````\_ ) |
| Practical use of antenna, tuner, etc by new tech |
WA1UKG |
on 19/10/12 |
| A 30 meter dipole will be roughly 55 ft of wire. I'm not sure I can get that in a straight line, so maybe an inverted U arrangement? I can mount some pvc on each chimney and run the end wires inside. That would put the horizontal wires at about 25 to 30 ft above ground. If I want good flexibility to different bands it sounds like I will need an autotuner. Should it be mounted right at the junction of the dipole? Is there any particular type that I should research? The peak of my roof is about 18 ft off the ground, and is 70 feet long. Maybe I can install some standoffs and run a wire along the peak? If I did that it would pass about 12" from the cooler. |
