Dear all, according to my experience radio transmitters with good efficiency and meeting all relevant data are usually designed for a load (!) of 50 ohms only, nothing else. But this does not mean th
Dear John, LF, I would like especially to comment on using a one winding loop combined with a step-up transformer: I am using such a loop for years with continuing success. The primary of the transfo
Dear John, I am sorry, but I do not see your problems. I do NOT tune my loop. The loop is feeding a transformer, its secondary is connected to a cable into the shack to the receiver or the preselecto
Dear all, I guess I can conform this, because in eastern Bavaria I receive the 504 signal using an untuned wire loop followed by a preselector before the receiver. 73 Ha-Jo, DJ1ZB
until now I have used the rule that the primary of such a loop transformer should have the same inductivity as the loop itself. In the design used in the picture I feel that the inductivity of the "p
Dear James and Alberto, I must confess that my considerations were much simpler. I wanted to find a solution for an outside wire (normal litz wire for electric home wiring) loop for broadband recepti
Dear all, just heard the end of a CW QSO between EI0CF (559) and G3XIZ (549) around 502,1 kHz at 21.48 UTC. Finbar had to go to bed immediately. Hope the signals will improve in the following months.
Dear all, G3LDO, in slower QRSS than before, again audible 579, QRN low, in eastern Bavaria, JN68GN, around 21,30 UTC on 501,1 kHz (I needed some time to count out the lengths of dots and dashes; sti
Dear all, tonight on Oktober 30th, 2009 around 23.00 UTC aural copy of SM6BGP on 501,4 kHz in eastern Bavaria, JN68GN; operating in QRSS and in between also in normal speed; RST 559 with qsb. He sent
Dear all, G3LDO could be heard again 559 in QRSS on 501,1 kHz around 21.15 UTC, October 9th, in eastern Bavaria, JN68GN. Even more interesting was the CW signal of EI0CF, RST 579, from 21.17 until 21
Dear Paul-Hendrik, thank You for your explanations concerning this "two-mode" X-band-QSO. We own just one rather old GSM unit which we are using very seldom, so I must confess that I would not have b
Dear all, G3LDO audible 559, some QRN, in eastern Bavaria, JN68GN, on 501,1 kHz in QRSS around 22.40 UTC. Yesterday night I had no time to listen, sri. 73 Ha-Jo, DJ1ZB
Dear all, Around 23.00 UTC on November 1st 2009 SM6BGP could be heard again in JN68GN beaconing 559 with QSB on 501,4 kHz. At about the same time EI0CF (readable up to 569 on 501,1 kHz) had a CW-QSO
Dear Peter, besides measuring the AL value as alrady described there is another rather simple way to determine the characteristics of ferrites: Take an Ohms meter and see if the core itself is conduc
