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

[Barry N1EU]

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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