Hello everyone, I will come with my input. I do not own and did not owned any commercial antenna ! According to my - our (+OK1RF) experience the problem of vibrations of the tips of elements is a MAJ
73 ! Jiri OK1RI Hi Guy, in a multiband array using a single boom it's not an easy task to find out where to place planar and different bands elements without affecting negatively the antenna performa
Hi, not exactly true. My observation: 20m - two Yagis on two towers - one @52m the other @24m. The "static" is always worse on the high one. Here I agree with Tom. Sometimes it helps to listen on 20m
The effect of large antenna close to a smaller one is always HUGE. Try to model it and you will see. The effect can be eliminated by changing the sizes of the given antennas, the results are often un
Hi, I agree. 1. Accuracy of modeling. Even with NEC2 or MININEC you get some results and you get probably lower impedances than the reality but the radiation pattern is probably more-less correct. 2.
I happen to be north of LA next Sunday. I would be most interested to join some MS - MM operation in the area to hear how the bands look from there. I do hope my call is known well enough to know who
Hi Jens, I will never sort the problems with Ray. I have sorted all the problems by myself after 6 and or 7 failures of the device (I have two pieces). Just a small remark. Take universal multimeter
Hello Jens, OK on your comment. Here is my explanation. Recommended voltages are : Cathode almost on the ground - recommended up to 10 Volts - maximum 100 Volts - at QRO - 120 Volts. Screen grid maxi
Hello Bruce, It used to be great book in it's time and Jim has shown a way to the future but it is already 20 years and fortunately the time has brought us a lot more knowledge. I do not believe it i
I respond to the discussion on vertically polarized deltaloops on ANT-modeling reflector. I respond here since I feel it might be interesting to wider forum and as I have seen the "talking" audience
You can find my long E-mail explaining all those matters in the archives of towertalk about 3 weeks back 73 ! Jiri Ok1RI I am planning to build a 2-el 75mtr delta quad. The plan so far is to use an o
If we are in this category of discussion another option is to build completely free standing 52 m. tower with no guy wires - like I have - and than simply move the full size 4 el. 40 (well over 500 l
<< You can find practical examples all over the world that support what I say. One is on high tension lines, where a round very smooth ring or ball is used to reduce corona from bolts and other hardw
Hello, I also want to come with few comments on the antenna height. We (me + OK1RF) do have here two antennas for 20m, one in 24m and one on different tower in 52m above the ground. As a rule of a th
<><><><><><><><><><><><><><><><><><><><><><><><><><><><> I question whether you have a "runnable" frequency by simply nulling out someone on the backside. YOU may no longer hear them, but the folks y