Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Exam
Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Exam
Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Exam
Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Exam
Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Exam
Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Exam
Here are some simple methods I have used for transforming impedance to match 75 ohm cable with 50 ohms: Method #1: alternating sections of 75 ohm and 50 ohm cable - each cut to 0.082 wavelength. Ex
1. Are you sure that the water table will be so shallow at your location? 2. Consider someone with a larger backhoe. A mid-sized hoe can easily get to the depth you need. 3. Once you dig down past th
Wayne, Try a u-bend of 1/4" diameter tubing about 12" from tip to apex set on about 6" centers. You can shorten it up as needed from there. Optimized Yagi designs usually end up with a relatively low
For a 2" OD tube mast with 1/8" wall thickness, increasing wall thickness will decrease stress for any given bending load as follows: 1/4" wall: 61% of 1/8" wall stress 3/8" wall: 49% of 1/8" wall st
Sorry to cause confusion. Loading forces applied to the mast create stresses in the mast. Temporary deformation (bending) of the mast occurs while the stresses are present. If the stresses present ex
John & Jim are absolutely correct. Compared to a 2" OD 0.375" wall mast, the stress developed for a given loading from increasing mast diameter / reduced wall thickness is as follows: 2.5" OD, .375"
I would check the 17m traps that come with the add-on kit before anything else. Matt KM5VI. Since the post, I took off the 30 meter add-on kit. SWR is exactly what it should be when the antenna is se
tower. I cut it 62ft6in so it should be on 3.750 however it seems long and the swr is 1:1 at 3550 or so. I have 10 radials and my longer version worked just fine. Any feedback would be helpful. I ha
I will echo that the comments by all are valid. I have the EF240X & an S402. Both are 2/3rds wavelength (~45') elements on 24' booms. The EF240X is linear loaded and the S402 is base loaded. Both giv
I ran a 1.2kW homebrew SS amp in my mobile for about 10 years using pairs of group 24 automotive batteries connected in parallel. The following calculations proved out more-or-less correct though som
P.S. A 10 amp charger into your battery(s) should keep up with the load even in a run-frequency contest situation on phone. Double it for RTTY. Beware to read the fine print on continuous duty cycle
Thanks Grant! Matt Matt, Are you aware of the W6NL Moxon designs? There are 3, two mods of existing 40m shorty beams and one that is a scratch build. They are in use by big contestors - eg. K3LR and
Depends on definition of serious but about 10 feet. I'm sure you will get a lot of answers. Modeling helps... Matt KM5VI How close vertically on the same mast can a new CC XM240 be to a big 10/15/20M
Please confirm the diameter with your old cracked pulley but I believe you will find that it is 2.5" diameter with a 5/8" shaft bore for use with a 1/2" width belt. Any bearing or supply house should