Join us Tues at 8 PM central time on W5KUB.COM. This week the new 630 meter ham band plus Katie visiting a ham club in Scotland. There is a big time difference between Scotland and us so we are still trying to work out how we bring this segment to you. Send us your shack pics for the show. We invite you to join our facebook group at https://www.facebook.com/groups/w5kub/
FYI, on the topic of 630m, even though some Canadian stations have been operating on the 630m band since it's allocation, the band has never been officially authorized for use. According to the ARRL "Amateur Radio operators in Canada gained access to the 472-479 kHz band on May 1." 2014. Radio Amateurs of Canada has also reported the same. Canada's regulator had also announced that the band had been assigned for Amateur use and listed it in their table of frequency allocations. Since that time a number of Canadian Hams have been using the band and several DX milestones have been reported on via various ham sites. I decided to build an antenna and begin some testing. Then I noticed that the other long-wave band assigned (137Khz) was listed in the Canadian list of Amateur band assignments BUT NOT 472-479 Khz. I though this was a little odd, so I contacted the Amateur Service Center and received a letter stating among other things, "Although this allocation has been made, these frequencies have not yet been included in the list of radio frequencies provided in the document RBR-4; Standards for the Operation of Radio Stations in the Amateur Radio Service. Consequently; there is at present, no authority for the use of these frequencies by Canadian Amateur Radio Stations. Canadian Amateur Radio Stations currently using this band are operating without authority, and this matter is being addressed by the Department. That was in May, 2017 and the frequency is still not listed. I'm guessing for those still operating on the band, that it may be a case of "It's easier to beg forgiveness than ask for permission" hi hi. 73 de VE1DAS Daryl
Most hf transcievers will receive on the 472khz band. I put my Ft-450 on wspr there last night as a receive only station and was pleasently surprized. I was using my dxcc fan dipole - worked fairly well.
Would a rig with the MARS/CAP mod be able to tx on these bands? I almost done with my 30 day waiting period since I registered per FCC requirement. Haven't heard a peep yet, and I'm not within the no-go distance of a broadband over powerline 'line' (I checked), so should be good to go.
2nd posting on this thread gave this link: http://www.472khz.org/pages/about-472-khz/getting-started.php if you have one of those radios you can mod it to work down there.
I figure it as maybe 1.1 ohm RL for my wire in the tree, realistically I'd be lucky to get it up past .8 ohm . That's with significant "hat" in the form of three wires near 40ft long. If I'm reading this right I'm somewhere north of 1400w in for 5w EIRP out ...
Depends, you didn't mention several other factors that are important to figuring out the EIRP. The formula is: P(EIRP) = P(TPO) * n * G(a), where: P(TPO) is transmitter power output in watts n is efficiency, generally calculated as R(rad) / R(feed). R(rad) is the modeled radiation resistance. R(feed) is the actual measured resistance. G(a) is antenna gain factor, which is calculated as 10 ^ (G(dBi) / 10). G(dBi) is peak modeled gain. For a top loaded vertical, typically 2.2 - 3 dBi. Unless you have terrible ground loss or using a very lossy, low Q loading inductor, I doubt you need anywhere near 1.4kW TPO to reach 5W EIRP.
