[TenTec] Orion 2 100hz off

[Scott Sheppard]

Thanks Marcus

I think for certain it's associated to what you are suggesting...I had
earlier dropped a note to the radiosmith, steve, who kindly replied he had
seen that issue in an Orion, but not yet on a O2. He too said to check the
Voltages going into the tcxo-- which I did...they are bang on by 'my'
measurements.

The A9 in this rig is a replacement board but still has the smaller caps. I
plan to replace those as soon as I get the parts...it needs to be done
anyway.

Thank you for taking the time to reply.

Happy New Year

Scott. Vy1co

On Fri., Dec. 30, 2022, 10:00 a.m. , <tentec-request at contesting.com> wrote:

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>    1. Re: Orion 2 100hz off (Marcus Florido)
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> Message: 1
> Date: Fri, 30 Dec 2022 11:08:34 +0000
> From: Marcus Florido <k4vbb at LIVE.COM>
> To: "tentec at contesting.com" <tentec at contesting.com>
> Subject: Re: [TenTec] Orion 2 100hz off
> Message-ID:
>         <
> CY4PR13MB122323FC0ADE608E2C1788258AF09 at CY4PR13MB1223.namprd13.prod.outlook.com
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> Content-Type: text/plain; charset="utf-8"
>
> These things drift over time, but I can't imagine that it drifted THAT
> much.  The first thing I would do is to measure the input voltage to the
> TCXO.  Make sure it's at spec.  Problem is, I don't know what that voltage
> should be, and the A10 board schematic doesn't appear to have that
> information readily available.  The TCXO appears to be run by a 74AC00 NAND
> gate chip.  Someone with more knowledge in this area "may" be able to
> extrapolate what that voltage should be from the datasheet (
> https://www.onsemi.com/pdf/datasheet/74act00-d.pdf) and the schematic.
> Knowing the "REF EN" voltage supplying the NAND gate would likely help, and
> someone with more patience than I have could likely follow this back and
> find out.
>
> What I can say is that rebuilding the A9 board solved a myriad of oddities
> with my rig.  It is entirely possible that a re-cap of that board might
> solve your problem, since that board is responsible for providing stable
> power to the rest of the rig.
> 74ACT000 - Quad 2-Input NAND Gate - Onsemi<
> https://www.onsemi.com/pdf/datasheet/74act00-d.pdf>
> 74AC00, 74ACT00 www.onsemi.com 3 DC ELECTRICAL CHARACTERISTICS FOR AC
> Symbol Parameter V CC (V) Conditions T A = +25?C T A = ?40?C to +85?C Typ.
> Guaranteed Limits Unit VIH Minimum HIGH Level Input Voltage 3.0 VOUT = 0.1
> V or VCC ? 0.1 V 1.5 2.1 2.1 V 4.5 2.25 3.15 3.15
> www.onsemi.com
>
> ________________________________
> From: TenTec <tentec-bounces+k4vbb=live.com at contesting.com> on behalf of
> Scott Sheppard <scott.vy1co at gmail.com>
> Sent: Monday, December 26, 2022 6:55 PM
> To: tentec at contesting.com <tentec at contesting.com>
> Subject: [TenTec] Orion 2 100hz off
>
> Hello everyone, and happy holidays.
>
> I have a new to me Orion 2 that runs very well, albeit 100 off  Freq.
>
> I have read the information on the tcxo, but it seems there is no
> adjustment left in it.. that is to say, it's set at the best position and
> movement turning either way only increases the problem.
>
> I would appreciate it if anyone has some alternative solutions I could try.
> It's not the end of the world, but it would be nice to zero it in. ...I
> remember having an Omni V with the N4PY v.2 chip...that was brilliant as it
> let you simply adjust the display to correct for crystal aging...
>
> 73 to all.
>
> Scott. Vy1co
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> End of TenTec Digest, Vol 240, Issue 10
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