[TenTec] Omni VI+ Frequency Display Problem Only On LSB

[Tom Stone]

Many Thanks to Carl, Barry and Paul for your very helpful assistance with
problem I had with my Omni VI+.
I adjusted the setting of C16 on the TX Audio Board and now the Omni is dead
on target when compared to my Orion II.
Sounds great on both LSB and USB.

73's  Tom N3XQ

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Barry N1EU
Sent: Friday, June 10, 2011 9:27 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Omni VI+ Frequency Display Problem Only On LSB

Okay, it's about the filter passband symmetry - alignment is just
going to shift the passband up and down a little.  It will sound thin
before and after alignment  ;-)

Asymmetrical USB/LSB thin-ness will be the filter's fault.
Symmetrical USB/LSB thin-ness will be the undefeatable 300hz high pass
dsp filter.

73, Barry N1EU

On Fri, Jun 10, 2011 at 9:15 AM, Paul Christensen <w9ac at arrl.net> wrote:
> Asymmetrical passband curve of the filter.
>
> Paul, W9AC
>
> ----- Original Message -----
> From: "Barry N1EU" <barry.n1eu at gmail.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Friday, June 10, 2011 9:09 AM
> Subject: Re: [TenTec] Omni VI+ Frequency Display Problem Only On LSB
>
>
>> Paul, why would USB sound thinner AFTER alignment?
>>
>> Barry N1EU
>>
>> On Fri, Jun 10, 2011 at 8:56 AM, Paul Christensen <w9ac at arrl.net> wrote:
>>> Don't be too surprised if after alignment, USB sounds noticeably
>>> "thinner."
>>> One reason for this occurrence is an asymmetrical passband of the stock
>>> 2.4
>>> kHz filter It's been a very long time (Spring, 1998 to be exact), when I
>>> asked INRAD to produce the 2.8kHz @ 9 MHz filter. As I recall, their
>>> filter
>>> has significantly better passband symmetry.
>>>
>>> Here's a quick test: After alignment, momentarily short out the 2.4K @ 9
>>> MHz filter with buss wire. Listen for differences in audio passband
>>> characteristics between U/LSB. If that re-establishes symmetry, you may
>>> want to consider the INRAD filter as a replacement if it's still
>>> available.
>>>
>>> Paul, W9AC
>>>
>>> ----- Original Message -----
>>> From: "Barry N1EU" <barry.n1eu at gmail.com>
>>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>>> Sent: Friday, June 10, 2011 8:40 AM
>>> Subject: Re: [TenTec] Omni VI+ Frequency Display Problem Only On LSB
>>>
>>>
>>>> Adjustment is made to the TX Audio Board, p4-23 of the manual
>>>>
>>>> 73/GL, Barry N1EU
>>>>
>>>> On Fri, Jun 10, 2011 at 8:23 AM, Tom Stone <sail8 at verizon.net> wrote:
>>>>> Berry,
>>>>>
>>>>> I set it up as you described below and yes, I can hear a distinct
>>>>> change
>>>>> when I switch from USB to LSB.
>>>>> Do you have any idea where the BFOs are located, which board?
>>>>> Hopefully,
>>>>> Chapter 4 of the Manual will provide
>>>>> enough detail to locate them.
>>>>>
>>>>> Tom
>>>>>
>>>>> -----Original Message-----
>>>>> From: tentec-bounces at contesting.com
>>>>> [mailto:tentec-bounces at contesting.com] On Behalf Of Barry N1EU
>>>>> Sent: Friday, June 10, 2011 6:55 AM
>>>>> To: Discussion of Ten-Tec Equipment
>>>>> Subject: Re: [TenTec] Omni VI+ Frequency Display Problem Only On LSB
>>>>>
>>>>> With PBT control centered at 12 o'clock, tune the Omni 6 to a clear
>>>>> frequency such that band noise is clearly audible. Switch back and
>>>>> forth between USB and LSB. Does the tonal balance of the noise
>>>>> (bass/treble) sound the same between the two modes? If it doesn't,
>>>>> this is more evidence that the BFO oscillators need alignment to bring
>>>>> them into balance.
>>>>>
>>>>> 73, Barry N1EU
>>>>>
>>>>> On Thu, Jun 9, 2011 at 10:24 PM, Tom Stone <sail8 at verizon.net> wrote:
>>>>>> Carl,
>>>>>>
>>>>>> Is that something I can locate and adjust using Chapter 4 of the
>>>>>> manual?
>>>>>> I
>>>>>> guess if I have to ask, the answer is "no".... :)
>>>>>>
>>>>>> Tom
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: tentec-bounces at contesting.com
>>>>>> [mailto:tentec-bounces at contesting.com]
>>>>>> On Behalf Of Carl Moreschi
>>>>>> Sent: Thursday, June 09, 2011 10:17 PM
>>>>>> To: Discussion of Ten-Tec Equipment
>>>>>> Subject: Re: [TenTec] Omni VI+ Frequency Display Problem Only On LSB
>>>>>>
>>>>>> The internal BFO frequency adjustment for LSB is off 250 hertz.
>>>>>>
>>>>>> Carl Moreschi N4PY
>>>>>> 121 Little Bell Dr.
>>>>>> Hays, NC 28635
>>>>>> www.n4py.com
>>>>>>
>>>>>> On 6/9/2011 9:59 PM, Tom Stone wrote:
>>>>>>> Has any owner of an Omni VI+ ever had a problem similar to this?
>>>>>>> (With
>>>>>>> the
>>>>>>> RIT off, Identical Side tone and Pass Band Tuning set at zero on
both
>>>>>> rigs)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Switching between my Orion II and Omni VI+ using an Alpha Delta
>>>>>>> switch
>>>>>>> on
>>>>>>> the same antenna. The Omni was just serviced by Ten Tec.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 160M - LSB - Orion II 1.900.000 For the same voice quality (sounds
>>>>>>> the
>>>>>> same)
>>>>>>> the Omni had to be tuned to 1.899.75
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 80M - LSB - Orion II 3.868.000 For the same voice quality (sounds
the
>>>>>> same)
>>>>>>> the Omni had to be tuned to 3.867.75
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Question: What could account for the consistent .25 difference in
the
>>>>>>> frequency read out? There is no difference when I am in the USB
>>>>>> mode.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Would appreciate any available input.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 73, Tom N3XQ
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
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