[TenTec] Sub-receiver noise redux

[TJ Sheffield]

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


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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