Re: Topband: OT: Studying the ionosphere using RBN

I went to tHel PNW to view this total solar eclipse. Found a place about 1 hour east of Portland, Ore a few miles south of the Columbia River Gorge with low horizons with clear skies, a rare event. At sunrise birds started singing and 10M opened to the east coast. As the eclipse started to

Re: Topband: OT: Studying the ionosphere using RBN

I found the discussion listed by N4HY to be an interesting read. In 1979 thee was a total solar eclipse of the Western US which occurred several hours after sunrise. The solar display was incredible and radio propagation was very much so enhanced on 160 with openings to East Coast of the US

Re: Topband: best headphones for cw

Some headphone can isolate noise very well. I like the Sennheiser HD280 , it provide 36db isolation, but the best one I have is the MC5 from Etymotic ear plug that can reach 42 db isolation. 73' JC N4IS _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: best headphones for cw

I have a pair of Sony noise cancelling phones. Once you try NC phones, you will never go back to conventional ones. Now if we could just get someone to make a set with a microphone. But you asked about CW, so that doesn't matter. There is an issue with RF getting into them, so they might not be

Re: Topband: best headphones for cw

I like my QC-15 noise cancelling headphones! Worth the money and they DO cancel-out fan noise from the K3 and my KW amp. I don't have any clacking relays when I key, so I can't comment on that. I use an adapter for the 1/8" plug on the QC's. 73, Charlie, N0TT On Fri, 17 Jun 2016 16:07:33

Re: Topband: best headphones for cw

Hi Chuck, I am using a pair of Koss KO.727s headphones. They work very nice with my K3 and my Yaesu FT920 and FT1000. I have been using them for years and like them very well. I see that the Koss KO.727b is listed on eBay. 73Price  W0RI From: Charles Yahrling

Topband: best headphones for cw

Looking for tips for headphone types for K3, CW only, so need 1/4 inch stereo jack. Object is to isolate from ambient noise in the shack, such as relay clatter from 1K-FA amp when keying. Been using a cheap set that came with Yamaha keyboard - I like how they attenuate hi freq band noise, but

Re: Topband: folded umbrella for 160 meter

Problem with the "folded umbrella" on 160 is that when the angle of declivity is to acute serious cancellation takes place. Also the feed of such an antenna is sometimes is very complex. I think this style of antenna has faded from popularity since the Marconi "T" is so much easier to

Topband: folded umbrella for 160 meter

In searching the archives I see a little discussion of the folded umbrella antenna.  This looks interesting.  Just thought I would see what the folks on this list think about it Jeff WO4R _ Topband Reflector Archives - http://www.contesting.com/_topband