Another single TA spot this night. 2016-02-18 05:44 WG2XPJ 0.475702 -26 0 FN34lp 1 DL4RAJ JN68kj 6228 53 Seems to be real,although no other EU station didn't spot it. 73 Clemens DL4RAJ
Hi Louis, thanks for the congrats! Here's another one from this morning. :-) 2016-02-19 05:46 WG2XKA 0.475723 -24 0 FN33lq 1 DL4RAJ JN68kj 6292 53 73 Clemens DL4RAJ
Hi Paul, I would recommend feeding DC not via the center tap of the output transformer because the DC current is biasing the core which reduces its "dynamic range" and increases losses and heat. Inst
Hi Bodin & Tobias, see the article on ferrite losses with DC bias. https://www.dropbox.com/s/4zu1apz99mopmj6/03_Core_Losses_UnderDC.pdf?dl=0 @Tobias I know the article you've pointed to. It addresses
Hi Paul, you might try an absorptive filter for harmonics as described in QST 11/1968 which is constituted by a highpass filter terminated in 50 Ohm, with its input parallel to the LPF, both having t
Hi Tobias, I agree in all points with you. I just referred to the multiturn primary as an example to prove that it is indeed the the DC bias which increases losses and I wanted to circumvent the disc
Hi Rik, thanks for obeservations and for evaluating the somewhat mysterious propagation on MW into JN68. There were other nights when even DH5RAE and DL0ABR didn't spot TA stations and I was the only
Hi Paul, Mix #2 (µi=10) is certainly the right choice for a LPF as Stefan and Tobias have pointed out. I use it too for my MW PA. The manufacturer on http://www.id-elektronik.de/en/index.htm => click
Hi Mauro, I have no hands on experience with this antenna, but simulations by experts have shown that one should go for a ~900 Ohm termination resistor and at least 50m length if you want to keep los
2016-03-22 04:54 WH2XZO 0.475640 -25 0 EM85wb 2 DL4RAJ JN68kj 7509 46 This is the only TA spot in EU from last night (except from "DL4RAJ/2" with -24dB which is a different RX on the same antenna). 7
