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
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
"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
We've been enjoying "AGC Treshold" for many decades, although we didn't use the name until the recent marketing breakthroughs :-) AGC threshold determines the point above which AGC loop is operationa
Unfortunately, they seem to be coupled. And encoder resolution on Orion is rather poor: * VFO encoder ~64/256 steps per revolution, compared to ~250/1000 on F1000MP * RIT encoder ~10/40 steps per re
This is true. It's certainly better to have a separate AGC threshold, as in Orion. Unfortunately, AGC Threshold control on Orion is an ergonomic disaster. It should have had a knob assigned to itself
If AGC Threshold control was reasonably accessible, I bet you'd be using it all the time. I find very useful for optimizing reception of individual signals. Unfortunately, it's impossible to use it q
That's exactly too much for me :-) I'm not sure either, just a though that it's position should be indicated in relation to signal levels presented on the S meter. Those 5-digit microvolts (with ~1 d
Can anybody explain what twist of mind one should perform in order to perceive the meaning of "AGC OFF" on Orion? Looks like it means "ON without limits". 73, Sinisa YT1NT, VA3TTN
Sounds like a theory. Have you really tried turning it off? What I see is the strongest possible AGC action with the threshold at/below noise level and 1000 dB/s. 73, Sinisa YT1NT, VA3TTN
This good article doesn't help, neither analog nor digital AGC cannot be turned off at all. AGC OFF forces the following parameter values: hang = 0 decay = 1000 dB/s threshold = 0.37 uV Far from bei
Increase in audio volume demonstrates only that the preamp has some gain, with AGC threshold not reached without preamp. Nothing more and nothing less than that. Taken alone, this says nothing about
Thanks, this clearly illustrates that K2's noise figure (preamp off) is too high for 28 MHz operation, at least for your location and antennas. How about Orion with preamp off? 73, Sinisa YT1NT, VA3T
First thing one should do is to adjust receiver sensitivity according to local conditions on the band in question. This procedure applies to any receiver, not just Orion's. Connecting and disconnecti