[TenTec] TenTec Digest, Vol 202, Issue 18
Ken Brown
kenradiobrown at gmail.com
Thu Oct 24 19:53:32 EDT 2019
I know of the sidetone adjustment, but that's all.
On Thu, Oct 24, 2019, 10:15 Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
> Yes, I would like to know where the software adjustment is located. I
> don't see that item in the Menu system.
>
> 73
>
> Bob, K4TAX
>
> On 10/24/2019 1:15 PM, Ken Brown wrote:
> > Hi Wes,
> >
> > How can I find that frequency adjust in the Omni VI software menu?
> >
> > Thanks, Ken N6KB
> >
> > On Thu, Oct 24, 2019 at 7:15 AM wes Bolin <k5apl41 at gmail.com> wrote:
> >
> >> The OMNI VI is a piece of cake and you don't have to open the case. In
> the
> >> software menu you can actually adjust the Oscillator frequency from the
> >> front panel. Its in the manual. I have done it years agoso
> >> don't remember the details. The OMNI V requires you to open the cover.
> >> The OMNI V did not have a TCXO, but the OMNI VI does, so you need to
> give
> >> it time to stabilize the frequency before you do any
> >> adjustments. Some guys have disabled the TCXO to minimize the drift
> after
> >> turn-on and stabilization. At any rate you have options to get it on
> >> frequency. BTW the best way to get it on the proper frequency is to
> have a
> >> frequency standard, not the other guy's comments. On 20M, the net on
> >> 14.300 is always very close to 14.300. Have fun.
> >> Wes
> >>
> >> On Thu, Oct 24, 2019 at 11:00 AM <tentec-request at contesting.com> wrote:
> >>
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> >>> than "Re: Contents of TenTec digest..."
> >>>
> >>>
> >>> Today's Topics:
> >>>
> >>> 1. frequency adj. (wt4t at reagan.com)
> >>> 2. Re: frequency adj. (Bob McGraw K4TAX)
> >>> 3. Re: frequency adj. (Gary Follett)
> >>> 4. Re: frequency adj. (Ken Brown)
> >>> 5. Re: frequency adj. (wt4t at reagan.com)
> >>>
> >>>
> >>> ----------------------------------------------------------------------
> >>>
> >>> Message: 1
> >>> Date: Wed, 23 Oct 2019 15:13:25 -0500 (CDT)
> >>> From: wt4t at reagan.com
> >>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> >>> Subject: [TenTec] frequency adj.
> >>> Message-ID: <1571861605.226246652 at webmail.reagan.com>
> >>> Content-Type: text/plain; charset="UTF-8"
> >>>
> >>>
> >>> Have a OMNI VI+ ,started to set up a position for the rig today and
> >>> noticed the frequency readout was off about .22 hz. I remember my old
> >>> omni V had a simple adjustment point to tweek the readout. Same on the
> >> + ?
> >>> if so what board and location would I find it?
> >>> The older I get the more I for get. 73
> >>> dale wt4t
> >>>
> >>> ------------------------------
> >>>
> >>> Message: 2
> >>> Date: Wed, 23 Oct 2019 16:56:07 -0500
> >>> From: Bob McGraw K4TAX <rmcgraw at blomand.net>
> >>> To: dale via TenTec <tentec at contesting.com>
> >>> Subject: Re: [TenTec] frequency adj.
> >>> Message-ID: <147bdd2c-2540-5db0-8b5c-9c3862e2856d at blomand.net>
> >>> Content-Type: text/plain; charset=utf-8; format=flowed
> >>>
> >>> Dale:
> >>>
> >>> The spec as I recall is +/- 50 Hz.? Looks as though you are well within
> >>> that spec.? Oh by the way,?? .22 Hz is ~1/4 of one Hertz. I think you
> >>> mean 22 Hz.
> >>>
> >>> You should check all bands and determine the error on each one. Each
> one
> >>> has a crystal oscillator operating in a Phase Lock Loop based on the
> >>> reference frequency.?? Earlier radios had a crystal oven which required
> >>> time to reach operating temperature.? It was not at uncommon for that
> >>> oven to fail and there was no temperature control.?? Also, if you turn
> >>> off the DC power to the radio, you should wait about 1 hr for the oven
> >>> to heat and stabilize.? Later radios had a TCXO which had a trimmer
> >>> accessed through a small hole in the top of the device.? They are about
> >>> the size of a postage stamp located on the Logic Board.?? Also you will
> >>> find that the BFO oscillators are not temperature stabilized.? Any
> error
> >>> or drift due to temperature change will cause an error in absolute
> >>> frequency.?? For these reasons, the spec is +/- 50Hz.
> >>>
> >>> Yes, you can correct the read-out but what frequency is the radio on???
> >>> Remember the digital read-out is just that, and is not a frequency
> >>> measurement.
> >>>
> >>> My advice, don't tamper with it.? You'll like come away frustrated and
> >>> maybe worse off than 22 Hz.
> >>>
> >>> 73
> >>>
> >>> Bob, K4TAX
> >>>
> >>> On 10/23/2019 3:13 PM, dale via TenTec wrote:
> >>>> Have a OMNI VI+ ,started to set up a position for the rig today and
> >>> noticed the frequency readout was off about .22 hz. I remember my old
> >>> omni V had a simple adjustment point to tweek the readout. Same on the
> >> + ?
> >>> if so what board and location would I find it?
> >>>> The older I get the more I for get. 73
> >>>> dale wt4t
> >>>> _______________________________________________
> >>>> TenTec mailing list
> >>>> TenTec at contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>>
> >>>
> >>>
> >>> ------------------------------
> >>>
> >>> Message: 3
> >>> Date: Wed, 23 Oct 2019 17:02:48 -0500
> >>> From: Gary Follett <dukeshifi at comcast.net>
> >>> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> >>> Cc: wt4t at reagan.com
> >>> Subject: Re: [TenTec] frequency adj.
> >>> Message-ID: <397421D8-7678-4F1F-B742-F84126145274 at comcast.net>
> >>> Content-Type: text/plain; charset=utf-8
> >>>
> >>> I suspect you MEAN off by 0.22 KHz not 0.22 Hz?
> >>>
> >>> Is it off by the same amount on all bands?
> >>>
> >>> Frequency calibration of the crystal board on an Omni VI is quite
> >>> different due to the PLL used for the crystal oscillator board compared
> >>> with the open loop operation of the Omni V. Alignment of frequency of
> >> this
> >>> board simply involves adjustment of the reference oscillator on the
> logic
> >>> board. It should be 20 MHz dead on.
> >>>
> >>> If it?s off by the same amount on all bands, it could also be the BFO.
> >>> However, this error in frequency should depend upon mode. LSB and USB
> >>> should show different errors and CW yet another. Alignment of the BFO
> is
> >> in
> >>> the TX Audio section for the manual. There are separate trim capacitors
> >> for
> >>> each mode.
> >>>
> >>> It is quite common for the trimmer caps in the BFO to become ?dirty?
> just
> >>> like a potentiometer or switch can get ?dirty?. Cleaning is a simple
> >> matter
> >>> of lightly spraying with non-residue contact cleaner, rotate full range
> >>> several times, let dry overnight at least, then calibrate the BFO
> >> trimmers.
> >>> Sometimes you can get lucky and clean the trimmers by dry operating
> >>> through full range several times without the cleaner. Then you can
> >>> calibrate immediately since there would be no trapped solvent to
> >> evaporate
> >>> out of crannies.
> >>>
> >>>
> >>> Gary
> >>>
> >>> W0DVN
> >>>
> >>>
> >>>> On Oct 23, 2019, at 3:13 PM, dale via TenTec <tentec at contesting.com>
> >>> wrote:
> >>>>
> >>>> Have a OMNI VI+ ,started to set up a position for the rig today and
> >>> noticed the frequency readout was off about .22 hz. I remember my old
> >>> omni V had a simple adjustment point to tweek the readout. Same on the
> >> + ?
> >>> if so what board and location would I find it?
> >>>> The older I get the more I for get. 73
> >>>> dale wt4t
> >>>> _______________________________________________
> >>>> TenTec mailing list
> >>>> TenTec at contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>
> >>>
> >>> ------------------------------
> >>>
> >>> Message: 4
> >>> Date: Wed, 23 Oct 2019 15:00:55 -1000
> >>> From: Ken Brown <kenradiobrown at gmail.com>
> >>> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> >>> Subject: Re: [TenTec] frequency adj.
> >>> Message-ID:
> >>> <CAGnjFfnmpGhnX+HSLjgrih8E=2z9ctYwGJ=
> >>> O3kkpbkyMej0f5Q at mail.gmail.com>
> >>> Content-Type: text/plain; charset="UTF-8"
> >>>
> >>> If you really mean 0.22 Hz you should consider yourself fortunate and
> not
> >>> mess with it. If it is 0.22 kHz off you can make it better, but not
> much.
> >>> I agree with Bob that you should check it on all bands. I expect you
> will
> >>> find it better one some bands and worse on others.
> >>>
> >>> My experience with two Omni VIs is that even when you get the BFO
> >>> frequencies as perfect as possible, say less than 1 Hz beat with a
> known
> >>> accurate reference synthesizer, and get the 20 MHz reference similarly
> >>> correct, the readout will still not be perfect. Off by tens of Hertz on
> >>> some bands. And this is the case even after confirming that the band
> >> select
> >>> crystal oscillators are locked to the reference.
> >>>
> >>> I have found that the offset is not necessarily proportionate to the
> >>> operating frequency, which is what you would expect if only the 20 MHz
> >>> reference was slightly off and the PLL system divide by numbers were
> >>> exactly correct. My theory is that the PLL system does not have high
> >> enough
> >>> resolution divide by numbers to really get the exact correct frequency
> on
> >>> every band. I think Ten-Tec rounded the numbers off to make the PLL
> work
> >>> faster and quieter, while still maintaining the specified +/- 50 Hz
> >>> accuracy.
> >>>
> >>> I would love to hear from someone who knows about the PLL program
> running
> >>> in the Omni VI, and knows what numeric values are in the ROM.
> >>>
> >>> DE N6KB
> >>>
> >>>
> >>> On Wed, Oct 23, 2019 at 10:25 AM dale via TenTec <
> tentec at contesting.com>
> >>> wrote:
> >>>
> >>>> Have a OMNI VI+ ,started to set up a position for the rig today and
> >>>> noticed the frequency readout was off about .22 hz. I remember my old
> >>>> omni V had a simple adjustment point to tweek the readout. Same on
> the
> >>> + ?
> >>>> if so what board and location would I find it?
> >>>> The older I get the more I for get. 73
> >>>> dale wt4t
> >>>> _______________________________________________
> >>>> TenTec mailing list
> >>>> TenTec at contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>>
> >>>
> >>> ------------------------------
> >>>
> >>> Message: 5
> >>> Date: Thu, 24 Oct 2019 07:56:47 -0500 (CDT)
> >>> From: wt4t at reagan.com
> >>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> >>> Subject: Re: [TenTec] frequency adj.
> >>> Message-ID: <1571921807.142530004 at webmail.reagan.com>
> >>> Content-Type: text/plain; charset="UTF-8"
> >>>
> >>>
> >>> Bob
> >>> thanks for your info. your right , I guess if it really is not broke
> ,
> >>> don't fix it.
> >>> dale
> >>> -----Original Message-----
> >>> From: "Bob McGraw K4TAX" <rmcgraw at blomand.net>
> >>> Sent: Wednesday, October 23, 2019 4:56pm
> >>> To: "dale via TenTec" <tentec at contesting.com>
> >>> Subject: Re: [TenTec] frequency adj.
> >>>
> >>>
> >>>
> >>> Dale:
> >>>
> >>> The spec as I recall is +/- 50 Hz. Looks as though you are well within
> >>> that spec. Oh by the way, .22 Hz is ~1/4 of one Hertz. I think you
> >>> mean 22 Hz.
> >>>
> >>> You should check all bands and determine the error on each one. Each
> one
> >>> has a crystal oscillator operating in a Phase Lock Loop based on the
> >>> reference frequency. Earlier radios had a crystal oven which required
> >>> time to reach operating temperature. It was not at uncommon for that
> >>> oven to fail and there was no temperature control. Also, if you turn
> >>> off the DC power to the radio, you should wait about 1 hr for the oven
> >>> to heat and stabilize. Later radios had a TCXO which had a trimmer
> >>> accessed through a small hole in the top of the device. They are about
> >>> the size of a postage stamp located on the Logic Board. Also you will
> >>> find that the BFO oscillators are not temperature stabilized. Any
> error
> >>> or drift due to temperature change will cause an error in absolute
> >>> frequency. For these reasons, the spec is +/- 50Hz.
> >>>
> >>> Yes, you can correct the read-out but what frequency is the radio on?
> >>> Remember the digital read-out is just that, and is not a frequency
> >>> measurement.
> >>>
> >>> My advice, don't tamper with it. You'll like come away frustrated and
> >>> maybe worse off than 22 Hz.
> >>>
> >>> 73
> >>>
> >>> Bob, K4TAX
> >>>
> >>> On 10/23/2019 3:13 PM, dale via TenTec wrote:
> >>>> Have a OMNI VI+ ,started to set up a position for the rig today and
> >>> noticed the frequency readout was off about .22 hz. I remember my old
> >> omni
> >>> V had a simple adjustment point to tweek the readout. Same on the + ?
> if
> >> so
> >>> what board and location would I find it?
> >>>> The older I get the more I for get. 73
> >>>> dale wt4t
> >>>> _______________________________________________
> >>>> TenTec mailing list
> >>>> TenTec at contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>>
> >>> _______________________________________________
> >>> TenTec mailing list
> >>> TenTec at contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>
> >>> ------------------------------
> >>>
> >>> Subject: Digest Footer
> >>>
> >>> _______________________________________________
> >>> TenTec mailing list
> >>> TenTec at contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>
> >>>
> >>> ------------------------------
> >>>
> >>> End of TenTec Digest, Vol 202, Issue 18
> >>> ***************************************
> >>>
> >> _______________________________________________
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> >> TenTec at contesting.com
> >> http://lists.contesting.com/mailman/listinfo/tentec
> >>
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> >
>
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