Hi Dave, have a look at the URE website: http://www.ure.es/noticias/2167-autorizada-tambien-la-banda-de-472-479-khz.html The band is authorized since 10 May 2013 with 1 W EIRP. 73, Rik ON7YD - OR7T V
Mal, who is to blame ? Does Radcom refuse to publish technical articles to keep more space for adds and "fairy tales" ? Or is there not enough entry of technical articles? I am closely cooperating wi
http://www.scrbg.org/g4jnt/NewLaws.htm Andy, The value for the speed of light must be raised. Yes, because increasing the speed ten times would - let us get rid the annoying time delay in EME QSO's -
Hello Mal, with my 136kHz PA (variant of the G3YXM Class-D push-pull) I get 450W output with 56V/9.5A supply, thus 85% efficiency. I once tried a 50W class-E PA and got over 90% efficiency with corre
Graham, attached a MMANA-GAL file that simulates my 136kHz antenna when adapted for 500kHz. Maybe that will be of some help. 73, Rik ON7YD -HELP- MMANA-GAL Antenna analyzer .... can anyone 'code' an
Dear Jim, thanks for sharing your experimental result with us, most interesting. Did you ever try to put (a part of) the loading coil up in the air ? What I experienced with my 136kHz antenna was tha
Hello Graham, the load (= loading coil) is at a rather unusual place: at the top of the vertical wire. Or to be exact, one segment below the top. If you want the load just above the feeding point jus
Dave, G3ZWH is peaking 559 now. No other signals ... I keep CQ-ing once in a while. 73, Rik ON7YD - OR7T Hi, Rik, John, Rik's signal is 539 here, with the typical 500 kHz QSB. The strange callsign th
Pat, the power difference between UK and Belgium is due to the conversion rate Pound / Euro ;-) 73, Rik ON7YD At 00:59 16/01/2008, you wrote: Shouldn't membership of the EU entitle us all to the same
Dear Walter, our 500 kHz access is for amateur stations, not experimental stations as in Germany. So we can make QSO's. 73, Rik ON7YD Dear Rik, that is very good news in the new year. Congratulations
Dear all, just worked my first QSO's on 600m: 21.01 G3AQC (559, deep QSB) = first ON-G 21.04 GM4SLV (339, peaking 519) = first ON-GM / 1102km 21.09 G3ZWH (529, steady) Sorry for the short QSO's, the
Dear all, I just finished my 500kHz antenna, 9m high and 26m long T-antenna. With a temporary PA (abt 100W) I can get 1.3A into the antenna, guestimated ERP is about 0.5 Watt. Enough to put a nice si
Dear all, I am looking for short term antenna and TX possibilities on 500 kHz. For the antenna I have 2 options: 1. a T-antenna 7m high and 10m top Simulation with MMANA gives a 0.13 Ohm radiation re
John, heard you 559 calling CQ. Much better than the 339 during our QSO. Going QRT now, tomorrows wakeup is at 05.00 UTC. 73, Rik ON7YD - OR7T .. calling ON7YD on 503.1 kHz, cracking signal here, des
Hello Dave and all, yes, good activity tonight. I worked GI3PDN, G3DXZ, M0KDW, G3XVL and GW4HXO. 4 countries in 2 days ... 96 to go ;-) Heard: G3AQC, G3ZWH and G0MRF beacon in CW It had been raining
Mike, right now were are more than happy with what we got, so we don't want to push our luck ... Maybe later. 73, Rik ON7YD Mike WE0H WD2XSH/16 73, Rik ON7YD At 08:19 16/01/2008, you wrote: On 15/01/
Dear all, a short overview of my first night on 600m: - 4 stations worked: G3AQC, GM4SLV (1100km), G3ZWH and G3WCB in that order - reception reports from OH (OH1LSQ, 1680km), SM, DL, SP, OK, PA - hea
Johan, indeed there are some limitations to MMANA. And when getting a negative radiation resistance one should get cautious. But for small verticals and small loops MMANA seems to work OK. I am using
Hello Paul-Henrik, nice to be heard at 1680km. Calculated Rrad of my antenna is 0.25 Ohm and antennacurrent is 1.4 A so theoretical ERP is 0.5 Watt. But I guess that the many trees surrounding the an
