The loop I built decades ago is made from 2 turns of 1" CATV hardline of 40" diameter which is remotely tuned by a set of BCB diodes and feeds PP U-310 Fets. There has never been a problem of BCB or
With commercial field strength meters being fairly available on the used market it would be one way to end the arguments with things that are purely speculative. Carl KM1H ___________________________
Ive doubted some of the claims about fresh water swamps based only on personal experience. At a prior QTH I had them on 2 sides and extending to a mile or more and the 160 vertical "appeared" to play
Well, Im on top of a pine and oak covered hill these days and RF ground resistance tests say it aint so hot; about 250 Ohms for the Beverages. There is about 8-10" of compost and then very bony soil
Thats hilarious, many hams have been crimping CATV soft cable for decades. I started doing it with RG-11 in the late 70's and RG-6 a bit later and have never had a problem from 160M to 70cm and runni
Ive been using BN73-202 cores on 2 wire reversible Beverages in the 500-900' range. They work fine down to 150KHz with surprisingly good directivity on the LF BC stations as well as NDB's They are wo
Use a screen of galvanized fencing at the base and on the ground extending for 50'. Do not connect to anything. Fencing that is galvanized and then plastic dip coated will last for decades; at least
I dont understand the sudden urge or desire of some to suppress all high angle radiation from an inverted L. It is well established that even a low horizontal dipole can work amazing amounts of DX on
I would call it a disadvantage. That high lobe has a definite advantage for many contacts, DX and somewhat local. I see it regularly on 80M with the inverted vee at 170' where the main lobe is at the
My point was that with one antenna you could have both angles available. The important thing is having the other station hear you and if you cover a wider range of angles you automatically have bette
Jim, it doesnt surprise me since youre generally North of the auroral zone so the signals have to go under it otherwise they are reflected or absorbed. The effect seems to be more pronounced on 80 an
What does Eznec say about the lobe powers? it seems that high angle does a lot of good as many are amazed how well it works especially when an optimum ground is impossible to install. A good friend w
I suggest the KISS principle Gilles. Use either a 100 Ohm resistor for the splitter and call it 50 Ohms or use 150 Ohms and call it 75. The antenna and the radio wont know the difference since all th
By seperating the primary and secondary windings and using a hi mu ferrite such as the BLN73-202 the capacitance is minimized and common mode isolation is in excess of 35dB in the transformers measur
A very effective on ground radial system is the 2x4" mesh fencing that is welded, then hot dip galvanized and then dipped in plastic. Cover as much of the backyard as possible, cover with 1/2 to 1" o
That isn't exactly correct, Guy. The 1937 real-world experiments of Brown, Lewis & Epstein of RCA Labs includes measured data for sets of of radials varying in number from 2 to 113, and in length fro
Installing a dense radial field in the first 50' is the most important step for a small lot. Galvanized and plastic dipped rabbit fence works wonders for that. Solder wires to the ends to extend the
I run mine at 12' so I can get a truck up the path to the back acreage. Carl KM1H How high off the ground does the feed point need to be on 160 to be considered elevated enough to use tuned radials?
In the East we have trees and use electric fence insulators for support. No problems with window line or military telephone wire unless trees come down. Window line is expensive these days and all my
One QST article from back in the 80's suggested sloping up from about 8-10', which was a comfortable place to work at, then a 45* angle to 20' and then horizontal. Perhaps someone has the details han