Stefan, See Dallas Lankford's site: http://groups.yahoo.com/group/thedallasfiles/ Yes F1AFJ used a K9AY with excellent results (until a local source of QRM appeared) Jean-Pierre even copied some T/A
Clemens you need to be careful about extrpolating this information!! dont forget that skywave at HF comes generally from the F layer which can be 600km up. LF signals come from the lower E-region or
Should read "Lankford " ! Sorry! 73 K2ORS On May 13, 2012 1:38 PM, "Warren Ziegler" <[email protected]> wrote: Hi Stefan, Your RX antenna looks very similar to the K9AY which has been used Very succes
Clemens, The G3LNP reactance tuned loop receives off the front so it has the same output level as a similar sized K9AY etc, the vertical angle of the rear facing null is steerable by varying the reac
Hello Group, I've just started to play a bit in EZNEC, trying to simulate a receive loop antenna for the new YV7MAE grabber. http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html ... still using
Am 2012-05-13 19:08, schrieb Stefan Schäfer: Any ideas, experiance or advice? Stefan, your model shows a lot of thermal noise and the gain is very low. Outer Ring below 70dBi is not useable. Attached
Stefan, Hartmut, Yes that is true but even the original K9AY also has very low gain as it was designed as an 80/160m receive antenna, to use a k9ay on LF/MF one needs to scale up the dimensions consi
Hello Stefan, You might try to contact your country man Hartmut Wolff. He used to run a 137 kHz grabber and his results were truly impressive. They stand out from the crowd is an understatement. He u
Hi Stefan, Your RX antenna looks very similar to the K9AY which has been used Very successfully by many LF /MF operators for years. It is a little difficult for me to picture the details as I am lo
GE Stefan and all, Try and see Jean-Pierre / F1AFJ 's page, he built and modeled a 2-turn K9AY, the one he uses for his grabber. Nothing to say about performance, it seems. Judge it by the summer T/A
Clemens you need to be careful about extrpolating this information!! dont forget that skywave at HF comes generally from the F layer which can be 600km up. LF signals come from the lower E-region or
Warren, I've buried out the article which was pubished in QST Oct 2010 and carefully studied again. Below you see a short excerpt from the text: -- "Results: Forward gain with 180 feet of feeder, ass
BTW, Tony Preedy G3LNP published an article last year in QST which had a loop with variable reactance and resistance termination, by varying the reactance one could adjust the vertical angle of the m
Warren Things have gone downhill since the introduction of Ferrite Stick antennas, uProbe antennas etc the K9AY antenna is a good sized loop antenna and does well. I use a 40 metre quad loop for gene
