This condition is not automatically satisfied by using an open wire feedline. A common mode current may exist on open wires just as easily as on coax. The open wire feedline owes its "low loss" prope
In order to be useful, S meter movement must be synchronized with gain decrease caused by either AGC or manual RF GAIN. That's how it works in "ordinary" receivers. If the current Orion implementatio
There are two facts. 1. Default Orion gain is higher that default gain of FT1000. 2. Orion has flat audio response, while FT1000 rolls off from 1 kHz, reaching more than -10 dB at 2.7 kHz. This is th
Is Orion 2 schematic available? In particular, is the codec clock synchronized to the main TCXO now? It wasn't in Orion 1, which made diversity reception marginal. 73, Sinisa YT1NT, VE3EA
Thank you for information, gentlemen. The frequency difference may be caused by firmware, even with all clocks locked to TCXO. The only reliable way is to look at the actual codec clock source. In Or
Yes, it's the same oscillator, but it's not used the same way. On both receivers, the received frequency is a weighted sum of two reference frequencies, but weighing factors are not the same: Fmain =
There are "FREQUENCY STABILITY NOTES" added on page 6, describing some abracadabra supposedly improving the frequency stability to that of the TCXO. This is also advertised on the Orion II web page a
No, the ADC sampling frequency was independent of the TCXO, and as a consequence, all DSP-related RX/TX frequencies were independent of the TCXO. 73, Sinisa YT1NT, VE3EA
It depends on how you do it. In Orion's case sub-Hz accuracy is achieved easily by beating two tones of similar amplitudes, that is, the SPOT tone and the received signal's tone. No S meter is needed
With equal amplitudes we have: COS (x) + COS (y) = 2 * COS ((x + y) / 2) * COS ((x - y) / 2) Example: freq 1 = 800.10 Hz freq 2 = 800.00 Hz what one hears is an 800.05 Hz tone with its amplitude vary
On the contarry, I find it very reasonable to adjust BW, RIT or something similar while sending in order to ensure better reception. 73, Sinisa YT1NT, VE3EA