Dear All, So i'm planning to made an Amrad antenna, i have send a request at Crystalonics for high current FET. Has anyone tried a small power MOSFET as input stage in an active antenna? I am thinkin
Anyone willing to design an USB interface for Intersil HSP50016 DDC? Together with an AD9260 ADC it would make a nice little front end for an LF SDR. Better chips are probably available today but the
Hugh, How have other people done it ? Any ideas ? I built a 1A antenna current meter with a current transformer. For calibration, I put a 10 ohm resistor (actually 10 x 100 ohms 1W in parallel) in se
Not sure if it is still a point to ground the center of the tuned loop. There is no hi-z amplifier on the tuned loop that can suffer from common mode hum but you still need a low impedance DC path t
My guess is the 10uF capacitor becomes 1uF and the voltage rises to 100V. That's my guess too, but... W [stored energy] = V^2*C / 2: With oil: V=10V, C=10u => W = 10*10*10u / 2 = 500 uJ Without oil:
Hi There is a DFCW beacon on 40 meters. Frequency: 7022.381 kHz (dot), 7022.383 kHz (dash). Element length: 10s Element spacing: 3.333s Character spacing: 10s Word spacing: 20s Power: 1mW into coax f
Just think what could be achieved with 1200 watts, a 100 ft vertical antenna resonated on 136 khz and a similar antenna at the receiving end instead of small loops or 3 feet active type antennas. As
Congratulations to Jim and John and of course also to Alberto and Vittorio. Congrats to Stewart too (if John used his decoder :-) Well done! 73 Johan SM6LKM
Could you please tell me if you know any off-the-shelf (or easy to use) amateur equipment that would be suitable for doing that (even if i still have to customize the equipement) ? Yaecomwood has wha
Yes, we use the YMD format in Sweden, falling digit significance from left to right. We use this strange format for normal numbers too ;-) CU on 713 Hkz 73 Johan SM6LKM The Swedes? John Rabson G3PAI
The DFCW beacon on 40m is now QRT but I am planning to try milliwatt DFCW or QRSS on 160m soon. 73 Johan SM6LKM Nothing received here Johan, sorry... but will keep trying. 73 Alberto I2PHD
I also checked the 200 baud data from DCF39 some time ago and found that the packet format was surprisingly similar to the "M-BUS" format used for remote reading from water, heat and energy meters. S
Hi Dexter, a funny "coincidence": http://www.irf.se/mag/ 73 Johan SM6LKM Just saw a very fast rise in signal strength of DCF39. About 25 db in 20 minuets. Steve's plot shows this fast rise also.
a) It is difficult to send your callsign every 15 minutes when it takes that longer than that to send your callsign ! It is a matter of perspective. If you are repeating only your callsign, you are
