Re: Topband: B7P
I have a 402CD ready to go once I get another tower up. We'll see how that works :-) 73, Mike W4EF. On 4/4/2024 10:57 AM, jim.thom jim.t...@telus.net wrote: Date: Wed, 3 Apr 2024 22:07:33 -0700 From: Michael Tope To:topband@contesting.com Subject: Re: Topband: B7P _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
Date: Wed, 3 Apr 2024 22:07:33 -0700 From: Michael Tope To: topband@contesting.com Subject: Re: Topband: B7P http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Topband noise, webSDR use, etc
Thanks to all for the gold mine of interesting commentary, articles, on Noise, webSDR, operating practices, which Ive saved to my files! Proving once again that the TopBand website is Top notch! Bob - _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
webSDR's are really fun to play with and great for testing purposes. But you can bet the mortgage they are also being used for other less than honorable purposes, especially on our beloved Topband. I'm interested the RM Noise initiative (https://ournetplace.com/rm-noise/). A search on YouTube brings up some excellent demonstrations. This could be a game changer. 73 Ken K4ZW On Thu, Apr 4, 2024 at 10:49 AM VE6WZ Steve wrote: > Here BG2AUE has been logged 3 times on 160m. > BD4WN 5 times, BA7IO 2 times and one QSO with B5TT. > > Unfortunately when I check QRZ for BG2AUE his QTH is spotted in the large > city of Harbin, and his equipment does not suggest any dedicated 160m rx > antennas. > My QSOs with BG2AUE have also suggested his rx is really good. > It is possible (likely) he is getting some NA webSDR help (like a KIWI). > Of course we won’t know for sure unless he says so on his QRZ page like > Kanti VU2GSM does. He lives in the city of Bangalore, and has little hope > of working DX on the low bands without webSDR. > If you have had QSOs with VU2GSM you will notice how quickly he responds. > I worked him on 40m when I was TX with just 10w. (I had info to know he > was rx on a local VE6 Kiwi at the time ) > > Steve, Ve6wz > > From Babcocks iPhone > > > On Apr 4, 2024, at 6:59 AM, John Kaufmann via Topband < > topband@contesting.com> wrote: > > > > It is also my experience that stations in China and Southeast Asia in > general do not hear well at all on the low bands. One exception is BG2AUE. > I have worked him multiple times on 80m CW from my QTH in the Boston area. > He hears extremely well on 80. Every single time I've worked him there, > he's been very weak but he's always answered me immediately. I've also seen > him spotted a few times on 160 but have yet to hear him there. That's an > extremely difficult path from W1 on 160. In fact, zone 24 is one of the two > remaining zones I need for 160 WAZ, the other zone being 26. > > > > 73, John W1FV > > > > > > _ > > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
Here BG2AUE has been logged 3 times on 160m. BD4WN 5 times, BA7IO 2 times and one QSO with B5TT. Unfortunately when I check QRZ for BG2AUE his QTH is spotted in the large city of Harbin, and his equipment does not suggest any dedicated 160m rx antennas. My QSOs with BG2AUE have also suggested his rx is really good. It is possible (likely) he is getting some NA webSDR help (like a KIWI). Of course we won’t know for sure unless he says so on his QRZ page like Kanti VU2GSM does. He lives in the city of Bangalore, and has little hope of working DX on the low bands without webSDR. If you have had QSOs with VU2GSM you will notice how quickly he responds. I worked him on 40m when I was TX with just 10w. (I had info to know he was rx on a local VE6 Kiwi at the time ) Steve, Ve6wz From Babcocks iPhone > On Apr 4, 2024, at 6:59 AM, John Kaufmann via Topband > wrote: > > It is also my experience that stations in China and Southeast Asia in > general do not hear well at all on the low bands. One exception is BG2AUE. I > have worked him multiple times on 80m CW from my QTH in the Boston area. He > hears extremely well on 80. Every single time I've worked him there, he's > been very weak but he's always answered me immediately. I've also seen him > spotted a few times on 160 but have yet to hear him there. That's an > extremely difficult path from W1 on 160. In fact, zone 24 is one of the two > remaining zones I need for 160 WAZ, the other zone being 26. > > 73, John W1FV > > > _ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
I agree about BG2AUE. He hears very well. I worked him on 80 in December 2017.73,Gary K9GS Original message From: John Kaufmann via Topband Date: 4/4/24 9:59 AM (GMT-05:00) To: topband@contesting.com Subject: Re: Topband: B7P It is also my experience that stations in China and Southeast Asia in general do not hear well at all on the low bands. One exception is BG2AUE. I have worked him multiple times on 80m CW from my QTH in the Boston area. He hears extremely well on 80. Every single time I've worked him there, he's been very weak but he's always answered me immediately. I've also seen him spotted a few times on 160 but have yet to hear him there. That's an extremely difficult path from W1 on 160. In fact, zone 24 is one of the two remaining zones I need for 160 WAZ, the other zone being 26.73, John W1FV_Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
It is also my experience that stations in China and Southeast Asia in general do not hear well at all on the low bands. One exception is BG2AUE. I have worked him multiple times on 80m CW from my QTH in the Boston area. He hears extremely well on 80. Every single time I've worked him there, he's been very weak but he's always answered me immediately. I've also seen him spotted a few times on 160 but have yet to hear him there. That's an extremely difficult path from W1 on 160. In fact, zone 24 is one of the two remaining zones I need for 160 WAZ, the other zone being 26. 73, John W1FV _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
Having lived in the developing world for over a decade, I can testify to the likelihood of lots of line noise, resulting from sub-standard, badly-maintained power infrastructure. The predominance of switching power supplies in both the developing and developed world just adds another layer.. For many of us, about the best we can do is try to clean up the environment we can control. 73, Pete N4ZR On 4/4/2024 1:07 AM, Michael Tope wrote: That sure seems to be the case, Bob. Heck even on 40 meters I have found myself calling loud Chinese stations in vein. My dipole at 45ft just doesn't cut it. It must be that there aren't very many BY hams that live in rural areas with low noise floors. Hopefully portable operations with verticals on the beach will catch on there. Somewhere I have a recording of WA6TQT running stations during the CQ WW 160 SSB contest from the old W6BH mountaintop super-station near Anza, CA. I was surprised to hear a couple of Europeans call him that I could actually hear Q5. It was quite a thrill. Conditions must have been very good that evening. 73, Mike W4EF... On 4/3/2024 8:13 AM, w3...@roadrunner.com wrote: Great to hear ur recording of B7P on 160m popping thru the noise, even if I am 2500 miles further east Hi Hi. This thread implies that Life in China comes with huge QRM-powerline noise, which makes a lot of sense. So the Chinese ops flock to 10m. Most of the ones I worked with my home brew Moxon at 22 ft were peaking 59 and in some cases even stronger during a 15-30 minute window post- Ohio sunset. _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
>It must be that there aren't very many BY hams that live in rural areas with >low noise floors. Hopefully portable operations with verticals on the beach >will catch on there. They need to get phasing boxes and figure out how to use them -- those things can't fix everything but they can clear out a frequency of one overwhelming noise source if it can't be controlled any other way. Rob K5UJ _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: B7P
On 4/3/2024 8:13 AM, w3...@roadrunner.com wrote: This thread implies that Life in China comes with huge QRM-powerline noise, which makes a lot of sense. Since the introduction of switch-mode power supplies, the fact that they are cheaper than traditional linear supplies, and the mandate for their use about 20 years ago, they, and other electronic noise sources like power control electronics for motors and solar systems, have become the the dominant noise in most of the world. While power line noise is still there, it is a total mistake to assume that noise we hear comes from arcing in defective equipment and hardware on power lines. I commend this applications note I prepared about eight years ago on the topic. It begins by showing how we can determine whether it's the impulse noise generated by arcing (mostly) on power lines, and the electronic noise. Their RF spectrums are very different, and there are differences in the ways we need to chase them. http://k9yc.com/KillingReceiveNoise.pdf and this slide deck for a talk at Visalia in 2017. http://k9yc.com/KillingRXNoiseVisalia.pdf NK7Z has developed excellent techniques using a very inexpensive (under $150, last I looked) SDR RX to identify multiple electronic sources and reveal the times of day they are active. Topbander WD8DSB has done excellent work on methods of chasing to the source(s). NK7Z's work can help us avoid chasing our tails when multiple sources are present (and they often are), and can tell us what times of day to chase them. Bottom line -- it's still critical to use DFing to get to the source, but electronic noise sources have both drastically increased noise levels around the world, and made finding the source more complicated. 73, Jim K9YC _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
