Barry,
Have you tried the TCXO kit from Ten Tec? I have installed several and the PLL
does settle down some as the result.
I have also had problems with poor solder joints on the PLL board. as well as
the connectors needing a good cleaning.
Fortunately, I have not had many PLL problems with the O6; Of course, I have
had plenty with the Paragon
Glenn
-----Original Message-----
From: Barry N1EU <barry.n1eu@gmail.com>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Sent: Sun, Nov 13, 2011 4:06 pm
Subject: Re: [TenTec] Omni 6+ PLL troubleshooting (was: Help with Omni 6+ rx
warble)
I notice that I can adjust C31 to minimize the warbling, resulting in
a calibration error of 0.7Khz on the main tuning dial. Could this
because the xtal oven frequency is off? Trying to bring the freq into
calibration with C31 is introducing too much PLL error?
(I'm really reaching here - any help appreciated - I'd hoping that
folks still work on their Omni 6's).
Thanks & 73,
Barry N1EU
On Sun, Nov 13, 2011 at 10:54 PM, Barry N1EU <barry.n1eu@gmail.com> wrote:
> I've finally got the chance to get the Omni 6+ on the bench. After
> replacing a very intermittent C31xtal oven trimmer, I started looking
> closer.
>
> I'm getting a rx "warble" now at about a 2hz rate. If I put a scope
> probe on the logic board PLL chip (U13), I see blips on pins 14 and 15
> (phase/freq detectors) in sync with the rx warble. I'm pretty
> clueless on PLL circuits. I'd appreciate any advice on how to proceed
> with the troubleshooting.
>
> Also, where is the 5Mhz PLL Board and the Xtal Osc/LO Mixer Board?
>
> Thanks & 73,
> Barry N1EU
>
> On Wed, Nov 2, 2011 at 9:37 PM, Barry N1EU <barry.n1eu@gmail.com> wrote:
>> I'd appreciate some help troubleshooting a pronounced hitch or warble
>> in the received tone, happening regularly about every 1.5 seconds. It
>> occurs in cw, lsb and usb. Please have a listen - this is 10 sec CW
>> plus 5 sec USB tuned to a carrier:
>>
>> http://n1eu.com/omni6_warble.mp3
>>
>> Can anyone provide some helpful troubleshooting tips?
>>
>> Thanks & 73,
>> Barry N1EU
>>
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|