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Re: [TenTec] Sub-receiver noise redux

To: "kd4e@verizon.net, Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Sub-receiver noise redux
From: John Merrill <jmerrill1@adelphia.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 20 May 2005 13:22:07 -0400
List-post: <mailto:tentec@contesting.com>
What other TT radio has a sub receiver :-)?

John N1JM


> 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
> To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> Subject: Re: [TenTec] Sub-receiver noise redux
> 
> 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:
>> 
>>> I¹m running firmware version 1.372 and using DX4WIN Ver. 6.04 to
>>> communicate with the Orion on a serial port.
>>> 
>>> A master re-set doesn¹t 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 don¹t 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.  I¹m running the latest
>>> firmware.
>>> 
>>> These observations will be cross-posted to ³ditsnbits² but I though I¹d
>>> mention it to the group.
>>> 
>>> Thanks very much,
>>> 
>>> TJ Sheffield, KL7TS
>>> Anchorage, Alaska
> 
> 
> -- 
> Thanks! & 73, doc kd4e
> 
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