Recent content by blue runner

Anyone have any experiance with real time software audio processing on a PC. Seems that if it worked as good as advertised everyone would be doing it. I'd like to try it using some kinda free or very cheap software and the PC soundcard. Ever use anything like that?

Anyone ever make a keyer circuit that just rectifies some of the input RF to drive the relay directly. That would eliminate keying transistors and associated circuitry. Would be handy to operate a remote keyed amp too. Shouldn't take much power from the input signal and most have to reduce...

Thanks for a very useful project and the most excellent photos. And thanks to all the guys that had some very good observations & suggestions. I might try this on an amp I have too.

Anyone have any info on this M400 linear, Class AB, 400 watt? I'm looking for the MFG info & schematics.

I thought the phases were in opposite polarity. Thanks for the enlightenment. After a moment of thought I realized that if they were opposite polarity then the currents on the surface of the shield of the lower half of a RFD 1/2 wave antenna would be messed up and of incorrect phase to make a...

Here is a thought.. a RFD (Resonant Feed-line Dipole) works because RF travels on the inside of the coax shield in one direction and the outside of the coax shield in the other direction. What do you suppose is going on inside aluminum tubing elements. Seems like RF should be flowing on the...

I'm thinking about using it in different shapes like maybe a 1/2 wave loop, spiral etc, supported by thin cypress or cedar strips. I just don't know it the center conductor will interfere. I guess the thing to do is just make a vertical dipole with it and compare its performance to my 1/2...

Anyone have any experience using just the coax shield for antenna elements? I have lots of 3/4" dia cable TV SEMI-RIDGED coax that would physically make good antenna elements for 10 & 11 meters. I don't intend to use the center conductor connected to anything (unlike in the "velocity...

This is Something that was revealing to me in regards to discussions about vertical antennas. I realized that I needed to pay attention about if the vertical antenna being discussed was a ground based one with buried radials or a ground plane one elevated several feet above the earth...

Well it looks like i found the vertical Extended Double Zep I was looking for. This one uses coax for the radiating elements and a configuration similar to the RFD - Reasonat Feedline Dipole. Now I just have to figure out how to re-design it in aluminum tubing to get the self supporting kind...

I ordered TWO co-phase harnesses offa Ebay (cheaper than I can make 'em myself). I will check them for the proper 1/4 wave length and try it with two 100 watt amps. I wonder just how much smoke can you get outta 100 watt amp? Might find out if things go wrong.

The power supply is a center tap kinda DC supply. Take two 6VDC wall warts and connect the outputs in series (+ of one supply to the - of the other). Where the two supplies are connected to each other is GROUND/COMMON/NEUTRAL. The voltage between the other two wires is +12VDC and -12VDC. Didja...

I used a similar coax matching system with an end fed half wave and it worked very well. I might try your coax matching dimentions on a 5/8 wave and extend the radials skirt to make an EDZ. Should be more practical than working with the open wire feed. I doubt the loss in the coax matching will...

I think that skip coming in from overhead or nearly so from the direction of the dipole ends will be received just fine as well as lower angle signals to the broadside. Probably signals from a lower angle will be affected as expected by the directional characteristics of the dipole. I did...

What direction is the broadsides of your EDZ facing? I put up a horizontal dipole facing E & W. However I still get strong skip from the N & S. I guess bouncing off the ionosphere not just changes polarity but brings signals in from overhead too. thanks for the reply and the always...