Re: Topband: Common Mode RF Currents Disrupting JT Transmissions

Well said! I have *never* seen a better source of relevant information. Period! 73, Mike www.w0btu.com On Feb 17, 2017 7:01 PM, "Goldtr8 (KD8NNU)" wrote: Read the information in the links from Jim Brown. Once you understand what he is explaining, it becomes easier to

Re: Topband: greyline prop forecast

What Frank says (below) is 100% correct. There is simply no substitute for time in the chair. I never use any propagation prediction methods. I know from more than three decades of lowband DXing and contesting experience when the openings are most likely to occur but I can't predict them in

Re: Topband: Common Mode RF Currents Disrupting JT Transmissions

Read the information in the links from Jim Brown. Once you understand what he is explaining, it becomes easier to fix. http://audiosystemsgroup.com/RFI-Ham.pdf http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf ~73 Don KD8NNU 2014 3905CC Top Gun :-) -.- -.. ---.. -. -. ..- -Original

Re: Topband: greyline prop forecast

<< True grey line radio wave propagation rarely occurs on 160 meters and true long path propagation even less. When it does the opening is usually only a few minutes long. Instead it's usually a skewed path that includes RF signal ducting in the E Valley/F layer propagation region. I'm

Re: Topband: Common Mode RF Currents Disrupting JT Transmissions

What is the rf grounding system for the antenna? If it's adequate then there shouldn't be any rf on the outside of the coax. If it isn't then you're bringing part of the antenna into the shack. Ferrites are a band-aid in this case. Wes N7WS On 2/17/2017 12:40 PM, Paul Kiesel via Topband

Re: Topband: Common Mode RF Currents Disrupting JT Transmissions

Paul, Loading the coax with ferrites might make a difference, but I don't think that's a good way to address the problem. If there's RF in the shack, that probably means it's being reflected from the antenna. With or without a ground at the shack, the antenna/load should absorb all the power

Topband: Common Mode RF Currents Disrupting JT Transmissions

Hello - I'm not able to run more than 150 watts when using JT65 on 160. RF gets into the computer and disrupts the JT signal. I don't have this problem on 6m where I run QRO using JT65 on EME. I installed ferrite beads on all radio and computer leads, with multiple beads on coax cables. My

Topband: W4HM Daily HF Radio Wave Propagation Forecast

I also produce a daily HF radio wave propagation forecast on my Facebook page at https://www.facebook.com/thomasfranklingiellaw4hm For my hamateur radio and SWL friends around the globe: Feel free to redistribute this "not for profit" solar, space and geomagnetic weather discussion and HF

Re: Topband: greyline forecast for 80m

Mirko S57AD, congratulations! I'm much closer to Alaska and I only work Alaska a couple times a year on 80M. I have been a ham for 39 years now, but I am a "newbie" to 80M. I never had an actual 80M antenna until 2008. The first week I had my 80M antenna up, I didn't "know" that "80M was only a

Re: Topband: greyline prop forecast

True grey line radio wave propagation rarely occurs on 160 meters and true long path propagation even less. When it does the opening is usually only a few minutes long. Instead it's usually a skewed path that includes RF signal ducting in the E Valley/F layer propagation region. I had a web

Re: Topband: greyline prop forecast

Hi, I sometimes look at the forecasts and space weather info but that is more often "after action" done in the chair. If we look at that first it gives a place to start. But I agree the final result comes from the chair time. 73, Bill KU8H On 02/17/2017 10:44 AM, donov...@starpower.net

Re: Topband: greyline forecast for 80m

W6EL prop program helped me to work my first (and single, so far) Alaska on 80m some 20 years ago. 73, Mirko, S57AD 2017-02-17 18:50 GMT+01:00 Merv Schweigert via Topband < topband@contesting.com>: > I agree seat time is the only sure way. I have tried a number of > different prop programs >

Re: Topband: greyline forecast for 80m

I agree seat time is the only sure way. I have tried a number of different prop programs and have not been satisfied so to speak. What I use now most of the time does not specifically show grey line, but does do long and short path, and you can "estimate" grey line by the sunrise / sunset

Re: Topband: greyline prop forecast

Hi Kris, There's no substitute for butt in chair time if you want to work grey line long path DX on 80 meters. 160 meters is also possible, but much more difficult. Just check your local sunrise/sunset times and the sunrise/sunset times in your target area and sit your butt in your chair

Topband: greyline forecast for 80m

Hello Kris N5KM, Thanks for the clarification. 80m is a different story. Yes, we can predict greyline propagation on 80m (I assume when you say greyline propagation, you mean propagation along the terminator). And our predictions say there is still significant loss along and near the terminator

Re: Topband: greyline prop forecast

Hi Carl, Well, I guess I was cheating a bit by posting here. I was hoping the folks who dwell here might be more knowledgeable about propagation than other forums. (You prove my case. Hi.) I've been concentrating on the lowbands (160m and 80m) so my question really was concerning 80m greyline