I am presently using a 30' base loaded vertical. The ground system consists of 90 radials from 12 to 25 feet. The base referred ground loss is 10 ohms. The problem is we really can't measure ground l
I have no evidence that would lead me to doubt the measurements of the other bands. 160 meters measurenent: 15 ohm base R 2 ohm radiation resistance 5 ohm cool loss 8 ohm ground loss (rounded to 10)
So, it looks like there is a window of about 6 hours of darkness. Any time in that window is a chance. I have also read that there is sometimes an increase in signal strength during the terminator. I
schedule. The problem with many DX-peditions today rather than in the past is they rely on SR/SS charts for the East Coast before they even check the band for a few test CQ's prior to what the charts
I didn't realize 160 was a shared band with fishing bouys. Rotten QRM... Someone will correct me if I am wrong, but I believe this either falls under international agreements of frequency use in inte
Tom, this is news to me. Maritime equipment is manufactured to extremely strict type acceptance. Can you give me an example of an Icom MF/HF maritime rig that can be used or reprogrammed onto the ham
A fellow ham once was on a trip from Spain to the Caribbean on a sailing boat. For comms with me and some friends he was using a FT-900, and as a backup rig he could have used the onboard Icom marine
I don't think anyone has mentioned the ONE VALID use for an "open" radio and that is MARS system service. It still exists and with the advent of radios that can transmit almost anywhere without modif
but they are a C H E A P crystal controlled "MOPA" with a 6-8 meter long whip. the ID runs on a cycle like Merv says. The beacons have something like 36 D cells for power - ballast and cheap batterie
For some while I have been hearing a strong spurious signal on about 1810.8 kHz. I thought it was a local SMPS or similar until I started trying to find it. It is not local to me it - I can hear it o
These beacons are not frequency agile. As Mike points out, they are on a schedule. The entire environment they are used in is pretty primitive. While they probably are simple systems, that is absolut
As we all know (should know), those two parameters are esential to evaluate the ground under our antennas, especially for verticals. The ideea to measure the ground concuctivity and permittivity rise
Guys, there is alot more circuitry in that buoy than a simple dumb transmitter. If those are claimed to be a crystal control simple dumb transmitter, they are not. The pictures they have posted are o
I have been hearing the same gnarly signal here in southern NH for a few days or more & thought it was local also but obviously much more wide spread. Very loud here (FN42dr) in early evenings and AM
Is this the correct thing to do? It is for me. :-) How do you know that the beacon user is breaking the law in his jurisdiction? Because I can read the International rules and regulations as well as
Has anyone employed that K6STI receive antenna? It doesn't equal a Beverage, for sure, BUT - for a small footprint area it looks interesting. I think you will find that loop a good example of a syste
I don't know about further out where you'd have to proof an AM station but I just ran some models and there's kind of a weird relationship between vertical electric field strength at 1 wavelength out
Well, there is no "modeling" associated with this effort, Tom - they just "did it".....built it, tuned it and used it! I've attached the article for perusal, if interested....Jim R. I saw the origina
l, I searched for the company name on those photos and it is a Japanese company that makes those models and many others. The one in the pix that were put up are fairly sophisticated and they operate
Don't you wonder what would happen, if 500 Topbanders all wrote a NICE, POLITE email to all the manufacturers of these devices, and in, say, 5-10 sentences or less simply asked them if they would min