Yes, the effective capture area for a given direction can be calculated from the gain in that direction, but then it is redundant. 73, Sinisa YT1NT, VA3TTN ___________________________________________
If the wavelength is known, as it normally is, then effective area can be calculated from isotropic gain, and vice versa: Ae = Gi * lambda ^ 2 / (4 * Pi) Gi = 4 * Pi * Ae / (lambda ^ 2) The origin of
It is necessary and sufficient to compare these and other antennas by comparing their [more or less] realistically computed radiation patterns, as related to the job at hand. It's a budgeting problem
I'd rather use a feedline: coax and a small ferrite choke at feedpoint. 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists
Yes - the context was that of increasing wire length for a fixed wavelength - in which case talking about aperture does not provide anything that's not already provided by the radiation pattern. I al
= good RF fed into soil :-) The loss is normally ~0.05 dB (read: immeasurable :-) Precondition for this is a resonant antenna, ensuring low voltage at the feedpoint. 73, Sinisa YT1NT, VA3TTN _______
With such a location one can afford loss of several dB's :-) 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting
Impedance must be low enough and resistive enough. 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailm
"K" is an excellent choice, stick to it. That makes a transmission line with a characteristic impedance substantially higher than 50 Ohms. You may wish to use a regular 50 Ohms coax, with Teflon insu
Held the USER 2 button on power up? 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/ten
AMP outputs have no relays, just transistors. But there is a reed relay somewhere in the TX output path and it can be heard easily. 73, Sinisa YT1NT, VA3TTN __________________________________________
PWR button, not POWER switch. 73, Sinisa YT1Nt, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
... Well, the best close-in dynamic range is just a single line, and in many circumstances not the most important one. It takes a whole story for the "best" transceiver". 73, Sinisa YT1NT, VA3TTN ___
Orion's close-in IM performance is substantially degraded with 500 & 250 Hz filters. Some claim that's due to additional gain, but I doubt it. 73, Sinisa YT1NT, VA3TTN ______________________________
I heard several German stations using IC7800 in past few weeks. 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contest
It should also switch Orion to transmit. That would give the exact control of T/R timing to those who need it, provided that the rest of Orion is capable of supporting such a thing. No, with both VOX
Reception agains QRN is fundamentally different from reception against steady backround noise. Setting decay rate to maximum effectively clips the input signal, be it CW, noise or QRN. Slightly less
Not on most contemporary receivers, including Orion and MkV. Pulsewidth? Unfortunately, most AGC systems are peak-responding. In what sense? 73, Sinisa YT1NT, VA3TTN _________________________________
NB doesn't care for the repetitive nature of pulses. It is tailored to a certain range of pulse widths, and QRN doesn't seem to fit in. 73, Sinisa YT1NT, VA3TTN ______________________________________
I certainly trust your results and would like to understand what is actually going on, i.e., I'd like to go a step beyond simply following recipes. Depending on QRN-to-signal ratio, it takes some tim