They certainly do interact....now you know why Paul Clinton would tell folks,
if it is working well, don’t worry about a few 10’s of cycles between friends.
Greg, KC8HXO
Sent from my Linux device
> On Jun 28, 2018, at 19:07, Stan Gammons <s_gammons@charter.net> wrote:
>
> Well, after tweaking C31 to try to get the 10 Mhz signal closer; it seems to
> be more or less behaving now... The jump on 30 meters is gone even though I
> was unable to get the lock signal to match the other bands. The 160 meter
> coil had to be adjusted in order to get the lock signal to be stable. So
> far, FT8 signals on 40 meters is decoding every time. Looks like the BFO
> trimmers need adjusting though. When I flip between LSB and USB while tuned
> to WWV, the tone changes. Looks like it's about 30 hz off on LSB and about
> twice as much on USB. Adjusting those is kind of a pain since they seem to
> interact with one another :(
>
>
> 73
>
> Stan
> KM4HQE
>
>
>> On 06/28/2018 05:23 PM, Stan Gammons wrote:
>> Hi Gary,
>>
>> I have the 10 Mhz signal. It seems to want to flop between 10,000.000 and
>> 10,000.001 to 10,000.002 at times. For some reason it kills the receive
>> when I connect the counter, a Leader LDC-823S, to pin 9 of U12. I have to
>> turn the rig off and back on to get the receive to work again.
>>
>> I take it U13 is the MC145170P1 chip next to connector 88? If so, it looks
>> like I have 160 meter problems since the signal on pin 11 is there for a
>> fraction of a second, then it's disappears and reappears. On all of the
>> other bands, except 30 meters, the waveform looks nearly the same. On 30
>> meters the waveform is wider. I haven't tried adjusting the coil to see if
>> I can get 30 meters to match the other bands. Strange thing though on 30
>> meters is FT8 still decodes even though it jumps about 100 hz for a very
>> brief time. I'll try adjusting the coil and pulling the board to see if it
>> has any bad solder joints. Still need to clean the connectors like Bob
>> described in another post.
>>
>>
>> 73
>>
>> Stan
>> KM4HQE
>>
>>
>>> On 06/28/2018 08:40 AM, k4mt1950@charter.net wrote:
>>> Stan:
>>> I have had the exact same problem with my Omni VI. There is a
>>> procedure to properly adjust band crystals. It is:
>>> Omni VI Lock PulseRig should be on for at least 1/2 hour.Check 10MHz
>>> REF at pin 9 of U12.Adjust 10MHz REF with C31.Check for lock pulse at
>>> pin 11 of U13, Scope probe on x10 position; .2 volts per div, and .1us
>>> time/div.Adjust L12 thru L21 on Xtal Osc. LO Mixer Bd. for the
>>> narrowest wave form.
>>> I did this but it did not help. I tuned in WWV and watched it on a
>>> waterfall and you could see carrier drifting back and forth. I was
>>> missing over half of the FT8 decodes as a result.
>>> What I found is PLL circuit on logic board is very temp sensitive. I
>>> tried to locate a part but the entire thing is that way. I found by
>>> putting a very small fin blowing across logic board completely
>>> eliminated the drift cycling.
>>> FT8 now works perfectly. Put the fan along the right side (looking
>>> from front) and not back panel. Back panel heats up during TX and when
>>> I put my fan there the problem got worse when I went into TX.
>>> Afraid its a design flaw and cant be fixed any other way.
>>> Gary K4MT
>>>
>>> -----------------------------------------From: "Stan Gammons"
>>> To: "Discussion of Ten-Tec Equipment"
>>> Cc:
>>> Sent: Wednesday June 27 2018 7:38:42PM
>>> Subject: [TenTec] Omni VI frequency jumping/drifting
>>>
>>> Hi Everyone,
>>>
>>> My Omni VI has decided to throw a few more fits. First the frequency
>>> jumped on 30 meters, but FT8 signals still decode fine. So I let it
>>> go
>>> and didn't mess with it. Lately 40 meters has started throwing fits
>>> and
>>> it's much worse than 30 meters. Looking at the FT8 waterfall, at
>>> times
>>> it will drift during the 15 seconds and it's bad enough the FT8
>>> signal
>>> won't decode. I sent another email to the list with the waterfall pic
>>>
>>> attached, but the message was too large and got rejected. I tried
>>> tweaking the coils on the crystal oscillator board. It might have
>>> helped 30 meters a little. Doesn't seem to have done much/anything
>>> for
>>> 40 meters though. Crystals gone bad maybe? If so, anyone know a
>>> source
>>> now that ICM is no more?
>>>
>>> 73
>>>
>>> Stan
>>> KM4HQE
>>>
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