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Re: [TenTec] Sub-receiver noise redux

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Sub-receiver noise redux
From: doc <kd4e@verizon.net>
Reply-to: kd4e@verizon.net,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 20 May 2005 10:49:49 -0400
List-post: <mailto:tentec@contesting.com>
Shouldn't Orion be in the Subject?

It is confusing and time-wasting to have to read through 50 lines of 
text in posts to figure out what rig is being discussed.

Just a request to help fellow list members.

IMHO, YMMV ...

Thanks! & 73, doc kd4e


John L Merrill wrote:
> I hear the pops, which is probably the PLL relocking ( common on other 
> radios). But hear no change in noise level.
> 
> John N1JM
> 
> TJ Sheffield wrote:
> 
>>I’m running firmware version 1.372 and using DX4WIN Ver. 6.04 to 
>>communicate with the Orion on a serial port.
>>
>>A master re-set doesn’t eliminate this condition.  Below certain 
>>frequencies the noise disappears.  Cycling the power when the 
>>sub-receiver is tuned below these frequencies fixes the condition, at 
>>least until it recurs on a random basis.  I am unable to determine if 
>>some combination of band / frequency / mode choice precipitates this 
>>condition.
>>
>>Rolling the sub-receiver across the following frequencies shows where 
>>the noise is present or absent (by mode):
>>
>>UCW  13.000.640  Present,   13.000.630 Gone
>>
>>LCW  12.999.300  Present,   12.999.290 Gone
>>
>>USB  12.999.970  Present,    12.999.960 Gone
>>
>>LSB  12.999.970  Present,    12.999.960 Gone
>>
>>AM   12.999.970  Present,    12.999.960 Gone
>>
>>FM   12.999.970  Present,    12.999.960 Gone
>>
>>Please try rolling your sub-receiver across these frequencies and let me 
>>know if you detect an audible pop or other indication that something may 
>>be happening in this region.
>>
>>In my case, even when the S-5 noise is gone, I can detect an audible pop 
>>when the sub-receiver is tuned across these frequencies.
>>
>>Thanks very much,
>>
>>TJ Sheffield, KL7TS
>>Anchorage, Alaska
>>
>>
>>=============================================================
>>PREVIOUS POST
>>
>>On an intermittent basis my Orion sub-receiver will display 
>>approximately five bars of noise while the main receiver may show S-2.  
>>Both receivers are on 20m at present.
>>
>>If I tune the sub-receiver down to 13.000.000 the five bars of noise is 
>>still displayed and the hash is still heard in the sub-receiver.  If I 
>>tune to 12.999.900 the five bars of hash drops entirely and a more 
>>reasonable 1-1/2 bars of normal background hiss is heard.
>>
>>The sub-receiver noise at 13.000.000 and above sounds something like a 
>>mixture of high and low tones that are cycling, burbling and/or pulsing 
>>at a rapid rate.  Sorry I don’t have a more technical description for 
>>this noise!  Tuning to 12.999.900 and below the hash disappears and I 
>>hear the normal background hiss of a quiet band.
>>
>>If the sub-receiver is above 13.000.000 and I cycle the main power 
>>switch off / on the condition persists.  If I tune to 12.999.990 and 
>>cycle the power the condition is cured but a noticeable pop is heard 
>>when rolling from 12.999.900 to 13.000.00 however the sub-receiver hash 
>>is gone.
>>
>>When the sub-receiver noise is present the rig is not useable for split 
>>operation but the cure at least is available.  I’m running the latest 
>>firmware.
>>
>>These observations will be cross-posted to “ditsnbits” but I though I’d 
>>mention it to the group.
>>
>>Thanks very much,
>>
>>TJ Sheffield, KL7TS
>>Anchorage, Alaska


-- 
Thanks! & 73, doc kd4e

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