Search found 11 matches

by rfn
Wed Apr 19, 2017 2:05 pm
Forum: AM Radio
Topic: EO Pulsar 1KW problem
Replies: 9
Views: 649

Re: EO Pulsar 1KW problem

When I was young and reckless I'd "shotgun" components of similar age/type. Then, all too often, I'd spend days trying to figure out which new part was causing the more severe problems that resulted. Occasionally it would be something I had done wrong - more often a bad batch of parts. Worst was whe...
by rfn
Sat Mar 25, 2017 6:12 pm
Forum: FM Radio
Topic: STL dropouts....back today
Replies: 23
Views: 1138

Re: STL dropouts....back today

Is there any body of water between the transmit and receive points? I've never had fog cause the kind of problem you describe but I have had temperature conditions create a sort of "lens" above a small lake that caused what you describe. Moving up might get you above it but, oddly enough, moving dow...
by rfn
Fri Oct 21, 2016 3:06 pm
Forum: FM Radio
Topic: Scala FM Antennas
Replies: 8
Views: 526

Re: Scala FM Antennas

The strength is in the materials but also notice the brace in the online illustrations. I've used Scala antennae of several types in arctic conditions where extreme icing and high winds are the norm....used 'em for over 45 years and some I installed in 1972 are still in service and, though somewhat ...
by rfn
Sat Feb 13, 2016 8:05 pm
Forum: AM Radio
Topic: Rotary Conveter on AM
Replies: 5
Views: 767

Re: Rotary Conveter on AM

Deep Thought, please check your private messages about an ND-25 issue that is off-topic for this thread but could save you a lot of work. Not of general enough interest to start a new thread.
by rfn
Thu Sep 17, 2015 1:12 pm
Forum: AM Radio
Topic: AM ground radial wire size and type ?
Replies: 13
Views: 1260

Re: AM ground radial wire size and type ?

How I wish it were always simple.... One site I used to care for (retired now) had an unburied ground system - specified that way on the license because it is unusual. It's on permafrost; the top few inches thaws in summer but anything buried is pushed back up within a year. Because the tundra is so...
by rfn
Tue Sep 08, 2015 12:44 pm
Forum: AM Radio
Topic: DX10 Turn Off
Replies: 18
Views: 1327

Re: DX10 Turn Off

Think about having the power provider temporarily place recording meters on each of the three phases. If there's some kind of hit on only one phase there's a good chance you wouldn't see any lights flickering depending on how you were getting from 3-Phase to single phase for non-transmitter power us...
by rfn
Mon Jul 13, 2015 8:46 pm
Forum: AM Radio
Topic: Folded Unipole Antenna
Replies: 17
Views: 1478

Re: Folded Unipole Antenna

Some 30_ years ago I picked up a "war surplus" transit for about $50 and learned to use it. It wasn't perfect; it was well beaten and worn. But it was adequate enough to run sightings on the AM tower from a couple of angles about 3 times a year and spot any plumb/true problems before they become a s...
by rfn
Wed Jul 01, 2015 5:56 pm
Forum: AM Radio
Topic: Maximum STA renewals ? Longest STA operation is ?
Replies: 11
Views: 709

Re: Maximum STA renewals ? Longest STA operation is ?

I don't want to know how this played out. As the cold war was winding down there was a proposed AM what would have put signal into a small, unpopulated area of The Soviet Union. FCC would have been cool with a CP if a waiver could be gotten from the Soviet agency handling that stuff. But there was n...
by rfn
Wed Jul 01, 2015 5:50 pm
Forum: AM Radio
Topic: Folded Unipole Antenna
Replies: 17
Views: 1478

Re: Folded Unipole Antenna

When you've run the program pause and think things through. 45 years ago I was party to the building of a 3-fold Mullaney designed (actually by the man himself) which performed as promised and made a low dial position workable in a location where airport proximities (plural intended) would not allow...
by rfn
Sat Nov 22, 2014 7:41 pm
Forum: AM Radio
Topic: Short AM Tower/Radiator on Rooftop
Replies: 25
Views: 1763

Re: Short AM Tower/Radiator on Rooftop

Last rooftop antenna I worked with was a 153' Wincharger. 250-Watts at 1400 kHz. A little short of 1/4 wave but easily tuned. Part of the tuning, as I recall, was accomplished through some innovative use of an open transmission line system that sort of erupted along the side of a 5-story building, t...
by rfn
Thu Feb 27, 2014 6:12 pm
Forum: AM Radio
Topic: antenna switch for 1kw AM
Replies: 20
Views: 2621

Re: antenna switch for 1kw AM

Things you probably know but just in case..... If you mount your relay anywhere somebody might be able to make contact with it beware OSHA and about everybody else's regulations and be sure it's protected from people (of which I'd worry more than about protecting people from it). I generally have ma...