Paul, why would USB sound thinner AFTER alignment?
Barry N1EU
On Fri, Jun 10, 2011 at 8:56 AM, Paul Christensen <w9ac@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@gmail.com>
> To: "Discussion of Ten-Tec Equipment" <tentec@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@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@contesting.com
>>> [mailto:tentec-bounces@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@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@contesting.com
>>>> [mailto:tentec-bounces@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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