With such an arrangement I think that one could try to play with phases to electrically steer heading, and consequently nulls. This obviously is limited to reasonable small amounts. 73, Mauri I4JMY
Point one. To measure the switcbox crosstalk at 450Ohm any 50 ohm instrument is good, just a 9:1 step up transformer is what needed if already the other 9:1 transformer is part of the switchbox, as i
Just a thought, instead of preventing interaction why do not make them interacting by purpose? Why not planning two verticals spaced a bit more than 1/8WL on 160 and then phase in a convenient way to
Hi Bruce, let's take it from the beginning with no hope to explain everything and knowing that it won't come out so perfect... An antenna at feed point has its impedance, unless special cases this im
First of all I suggest You to forget about strange things like a 3 wire unipole. What you need is an omega match, that's all. The shunt feeding of a short monopole it's not the best way to feed becau
I agree with Tom's arguments, just I like to add that when composition resistors of proper power aren't available, a parallel of metal film resistor are easy to find, withstand more power and show le
The major problem with receiving antennas when the available space is small, is the coupling with the transmitting aerial(s). In my experience I found that small loops can work if rotated for the min
Admitting the inverted L lenght is such to determine enough current flow in the horizontal section, how does this field can have the same polarization and consistent energy to add "efficiently" with
The estimated allowable exposure to RF fields is generally calculated referring to frequency, age, time and periodicity of exposure. Generally speaking, the lower the frequency the higher is the allo
It means that only one beverage at a time has to be connected to the transformer or, if you are afraid about switching some 400 Ohm, that the multiple transformers (boxes) shouldn't share a common gr
Hi Uli, there is no practical problem, as I measured a similar setup, in doing what you do. One beverage transformer, one ground, one line and simple remote switch of the beverages wires, wires diver
With proper tapering and guy wires there's no need of fiberglass for a full size 80m vertical. Under the perspective of efficiency for such a lenght vertical, I wouldn't waste time with linear loadin
I've no background and/or datas to say if the Moon has any direct or indirect influence with 160m propagation, in any case a full moon hasn't anything to do with the distance of Moon from Earth. A fu
Well sayed and easy to demonstrate. A surplus thermocouple ammeter will indicate the current flowing, either in the a metal screen just below an antenna or in a set of radials that extend away. Users
I think and noted that when the vertical's near field overlaps with the beverage, the coupling is noticeable and disruptive. Of course the amount of detrimental effects are partly subjective, I mean
To check a rough figure of curves "summatory" place back to back two identical transformers, then test them under a network analyzer or a spectrum with tracking. 73, Mauri I4JMY
I totally agree with this point. This concept works, but also allows to recover in case of bad conditions or stormy weather. I think it would be a positive enhancement to be introduced it in any cont
Guys, honestly, I don't think this thread is really very practical for amateur purposes. Before twisting (the brain) I'd check isolation (realy, common mode, etc.) between transmitting port and tecei
The balance in a shielded loop is real because the turn inside the loop couples to the inside of the shield only. On the other hand, the shielded loop suffers by distributed capacitance and extra los