Yup...wish I could find an RX-366 to upgrade my OII... Production was short...
Cecil K5DL Sent using recycled electrons. > On Nov 30, 2015, at 7:14 PM, Barry N1EU <[email protected]> wrote: > > Thanks Tom. FWIW, Ten-Tec offered an upgraded subreceiver (RX366) for the > last year or two of Orion2 production (very similar to main rx, adapted > from their Eagle xcvr). At the same time, the Orion firmware was updated > to offer a front panel feature to manually adjust the RX366 oscillator > frequency in 0.1Hz steps to precisely zero beat again the main rx. It > works well and maintains the phase relationship over time as well as across > the bands. > > 73, Barry N1EU > > >> On Tue, Dec 1, 2015 at 12:19 AM, Tom W8JI <[email protected]> wrote: >> >> Barry, >> >> It is more than just second receiver quality. For maximum diversity >> effect, the receivers must use a common time base for both channels. They >> do not have to be phase synced (unless blended into mono), a person's brain >> will learn around that. The channels should not drift phase when on a given >> frequency, and if phase changes with tuning, it should be very gradual. >> >> This can be checked by running a common oscillator or carrier signal into >> both channels and listening in mono. Another test is observing background >> noise with a single antenna common to both channels. Listening in mono can >> be as simple as laying the headphones on the desk. There should be no beat >> warble or no fading and peaking on a carrier, and when the band is swept on >> noise any change in apparent audio level with frequency change should be >> very gradual. Ideally there should be no changes at all. >> >> My R4C's, because I used one receiver's oscillators to run both channels, >> were perfect. The K3's I have are imperfect, they have a gradual phase >> change between channels with frequency. >> >> My FT1000D was terrible, as was the Orion I had. They gave some diversity >> effect, but were so far unsynced they did not give the deep noise digging >> the K3 or R4C system would. >> >> If you never use a system that is phase locked, you might not realize the >> difference. The channel audio phase relationship has to be stable without >> drift to get the real enhancement. > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
