Ed, you're quite right. In Canada, we have a ham band at 2200m (135.7-137.8kHz) which I am (very slowly) working on becoming QRV on. The regulations are different than other ham bands in that we are limited to 1W EIRP. Even with that low level, DX is possible, for instance VE7TIL-JA7NI in 2010. So don't discount what a low EIRP can accomplish!
73 Sean - VA5LF On 2012-01-13, at 12:02 PM, Edward R. Cole wrote: > Mike Morrow, KK5F, wrote: "It is damnably difficult to radiate *much* > power on 600 meters unless > one has a lot of transmitter and real estate for antenna and ground." > "Most hams will be lucky to achieve a few milliwatts ERP from a few hundred > watts input power with small antennas not located over salt water." > > Well I assume you are talking theory. I have been QRV for over a > year on 600m running 100w RF output to an inverted-L antenna (43ft > high x 122ft long) with large loading coil at the base. My > calculated (EasyNEC2) ERP = 4.15w (not mw). Granted that this is an > antenna efficiency of 0.8% so little RF is effectively radiated (most > is warming worms). I consider my soil as poor and use four radials > of 2-foot wide chicken wire laid on the ground surface. MY signal > has been detected 2800 miles away! QRO and renting a WWV site is not > needed! Some of our participants are radiating 20w ERP using 500w > amplifiers. BTW my 600m radio is my K3 or alternate Rx: SDR-IQ. > > BTW I regularly check into the Elecraft 20m-SSB Net with 16w from my > K3/10, with little problem. Again, QRO is overrated. Maybe in a QRM > loaded 20m contest but this does not exist on 600m. Just a handful > of experimenters and enthusiasts finding out what can be done with ERP<20w. > > Actually more than you would guess. Out to 300-km propagation is > 100% all the time using ground wave. I made a series of GW tests in > summer of 2010 running 4w ERP with +35 dB SNR ( S6-S7) at 100-miles > at my two receiving partners. I wish our station in North Pole (AK) > had been active (300-mi) to gather info at that range. > > In the winter 600m acts somewhat like 160m with lengthening DX over > thousands of miles. I have copied a station in Buffalo, NY at about > 4000 miles from me, and several instances of copying Vancouver, BC > and Oregon (1300-2000 miles). The biggest limitation is static noise > in the lower-48. It doesn't exist much up here in Alaska. > > So, yes, full-size antennas are huge, but a typical 160m antenna, if > loaded, will work pretty good! > BTW I've heard that theoretically bumblebees cannot fly! ;-) > > > > 73, Ed - KL7UW, WD2XSH/45 > ====================================== > BP40IQ 500 KHz - 10-GHz www.kl7uw.com > EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? > DUBUS Magazine USA Rep dubus...@gmail.com > Coming Soon - "Kits made by KL7UW" > ====================================== > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
