Hi gang! I have been tossing around different ideas for a top band TX antenna this winter to replace my inverted L. My highest support is currently 12 meter and I have a limited lot which restricts g
I have a question some of you might be able to answer; How good is a mix of fresh and salt water as ground for a vertical. I am living in Stockholm and have access to the Baltic Sea from one QTH, but
I need a little advice on using antenna analyzers to tune topband antennas. As they are pretty long I assume they build up some static that might hurt an instrument connected. Am I right? I just boug
Thanks to all answering me on this topic, got quite a few replies off list! The consensus seems to be that there is no need to worry about static build up when using the analyser on large antennas. M
Dave, thanks for the great idea! I will use a T-connector with a shorted BNC plug when connecting the antenna. And thanks to everyone who contributed to the subject! 73 de Björn /SM0MDG _______
Hi gang! Some time ago I asked for antenna ideas for the 18 meter glass fibre Spiderbeam pole. Thanks for all the input! Of the many ideas I have chosen to go for a top loaded vertical with three slo
I a message of another subject I posted the question below. Since I did not get any replies, here I go again; I made an unun using a T-200-2 with a 19 turn bi-filiar winding using 1 mm enamelled CU w
(maybe someone could manage to avoid the top section drooping with a clever arrange of T configuration top loading wires acting as guys) these are fine even for longer term use. << I use the Spiderbe
Hi Gang! I am about to make an unun for my top loaded topband vertical using a FT-240-61 core. I need a 2:1 ratio as the antenna has around 25 ohms feed point impedance using two elevated radials. I
Thanks for your input Sinisa and George, It is very useful information. I have to make a correction to my previous posting though, the antenna measured around 16 ohm, not 25 that I initially stated.
transformer for the K9AY loop I just built?<< George I made a transformer like this initially, then I found this message on the topband archive from K9AY where he describes a "binocular" transformer
when the feedline shield is not decoupled. This says nothing about the unwanted coupling of noise into the antenna, or RF into other devices close to the feedline or operated from the power line. <<
Good point - Amidon customer service is extremely poor. I ordered 5 pc of FT-240-61 two months ago, they wrote the wrong name on the parcel (but the correct address). Even after several contacts wit
My question generated a lot of response, seems like I am not the only one getting questionable service from Amidon. Below are a few sources suggested to me in private; Corecom in Sweden, SM5BOQ Bytem
NA so EU just kept calling and calling. << Another interesting "mistake" 1A4A did yesterday was to answer callers on his TX frequency, this happened at least twice. First I though the station calling
Dave, Thanks for the example, it is very good reading! I agree it would be useful to measure the feed line current, but what I have at hand is a Palstar ZM30 analyzer, a multimeter and a RF probe. I
difference. << Update: I added the choke at the antenna base. Before doing that I created a probe by wounding abt 15 turns of enamelled wire around the coax close and localised a point on the coax w
How would you best set up a remote topband listening station? I want to move my K9AY away from buildings and QRN. We own a piece of land "by the end of the road" and I am thinking of setting up an ex
Thanks for all the input on this question! Based on the response I will re-consider the coax option. Maybe I could get away with it if I let snow conceal the cable. Another option would be a separate
connection because we use two computers most of the time....will I cause it any trouble from my 400w on Topband and will it give me any trouble?..IT ignorant.. is there another way to go ie non wirel