Not impossible, but very difficult. What is required is a current balun with very high common mode impedance, able to withstand very high common mode voltage, which can be many times the antenna feed
Hi, as I see it, Mr Cebik did build his reputation upon quality of his work, not the price of his tools. Every mortal is error-prone, including me, you and to some degree Mr Cebik. In particular, Mr
Very interesting topic. Would you recommend any additional reading? 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.con
This is undoubtedly so. I did learn a lot from Mr Cebik's articles. However, even leading experts make errors or omissions occasionaly. That's natural and doesn't diminish their contribution at all.
Looking forward to it. Thanks! 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
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
You just sold me the software :-) Wishing it was in S units! 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contestin
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
Dear Rick, there is a very good technical reason for the test. Far from being a [French word], the test checks a vital condition which influences receiver's ability to receive weak signals, when the
Your tests prove that Orion has low enough internal noise to be used without preamp in most situations, unlike K2. Leaving preamp off of course ensures best possible dynamic range, which may be signi
If the external noise moves the S meter sufficiently, one can use its indication which is reasonably accurate and does not depend on AGC THRESHOLD. If the test must be done by external instrumantati