[TenTec] Orion and phase noise

[James Duffer]

I have seen rigs that had to leave during field day due to their excessive 
phase noise.  I guess when the location has many rigs (as this was the case 
for field day) phase noise is an "issue"

73, Jim wd4air


>From: John Rippey <w3uls at 3n.net>
>Reply-To: tentec at contesting.com
>To: tentec at contesting.com
>Subject: [TenTec] Orion and phase noise
>Date: Fri, 05 Dec 2003 13:42:22 -0500
>
>The ARRL lab has found the Orion's transmitted phase noise to be the lowest 
>of any rig ever tested there. It's -140 db/Hz from the get-go. If I read 
>the ARRL Handbook correctly (2004 edition), transmitted phase noise is a 
>critter that is much harder to tame than receiver phase noise because you 
>can use crystal filters in the receiver signal chain to limit the bandwidth 
>getting to the IF, etc. So going by this reasoning, the engineers at 
>Ten-Tec have set a new very high bar on transmitted signal junk while the 
>RECEIVER phase noise of the Orion must be below the ability of any lab to 
>measure . . . (?)
>
>But what does this get you when the airwaves are full of solar and man-made 
>junk? Looking at past ARRL Lab reports, all but the ICOM PROs show quite a 
>lot of transmitted phase noise. So in a contest, such as the upcoming 160 
>meter deal, there are lots of signals transmitting a lot of junk. Nirvana 
>would be if all the contestants were using Orions, or ICOM Pros, but 
>they're not. So the wonderful low phase noise of the Orion's receiver sits 
>there underneath all the signal traffic that is being received and 
>processed.
>
>Isn't the end result that a receiver with much less attractive phase noise 
>numbers can probably perform just as well as the Orion in the current noisy 
>signal environment? Is this truer for phone than CW?
>
>Am I missing something?
>
>73,
>John, W3ULS
>
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