[TenTec] Ten tec omni 6+ (5 mhz PLL board)
Barry N1EU
barry.n1eu at gmail.com
Thu Nov 12 09:26:07 EST 2015
I added it here: http://www.tentecwiki.org/doku.php?id=564pll
73, Barry N1EU
On Thu, Nov 12, 2015 at 9:01 AM, Joe Papworth via TenTec <
tentec at contesting.com> wrote:
>
> Glad to contribute to the cause Barry. Looks like the reflector
> squeezed the text all together. It's easier to read if you click on the
> original post.
> By the way, it has been over 6 years and that problem never reared its
> ugly head again.
>
>
> Later, Joe, K8MP
>
>
> -----Original Message-----
> From: Barry N1EU <barry.n1eu at gmail.com>
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> Sent: Thu, Nov 12, 2015 8:32 am
> Subject: Re: [TenTec] Ten tec omni 6+ (5 mhz PLL board)
>
>
>
>
> Thanks Joe, very helpful troubleshooting info for my favorite radio of all
> time!
>
> 73, Barry N1EU
>
>
>
> On Thu, Nov 12, 2015 at 8:03 AM, Joe Papworth via TenTec <
> tentec at contesting.com> wrote:
>
> > Hi Mike,
> > Here's my final synopsis. There's more here than you'll probably
> ever need
> > to know. By the way, the info is also on the reflector from back in
> '09
> > when I had the problem.?
> >
> http://lists.contesting.com/archives//html/TenTec/2009-10/msg00238.html
> >
> >
> > I suggest you compare my symptoms to what you're rig is doing and
> > if it's the same (or very similar), just go for the?jugular and hit
> ALL
> > the connections on the 5 mhz PLL board.?
> >
> >
> > Later, Joe
> >
> >
> > Radio Dudes: I figured I'd give you a final (I hope) synopsis on the
> > PLL/Synthesizer problems I dealt with recently. The info may come
> in handy
> > for someone, some day. By the way, thanks to those who steered me
> towards
> > the PLL board. Otherwise, my radio might still be broken. (or in
> > Sevierville) Symptoms:The display reads correctly. It even changes
> when you
> > turn the VFO. However, the received freq doesn't change. How did I
> know
> > that? When I changed bands to 160, I could hear an AM broadcast
> station.
> > Turning the VFO didn't change what I was hearing. Fixing it:It was
> > suggested that I check the 5 to 5.5 Mhz output from the PLL. I
> didn't have
> > a freq counter, so I used a Tektronix 456B, which is a 200 Mhz
> scope. The
> > output showed as 5.8 Mhz and it did not change when cranking the
> VFO or
> > hitting the up/down buttons. The 2 inputs to the board (10 Mhz
> clock and
> > serial freq data) appeared to be good, so I was pretty sure I was
> on the
> > right track. NOTE: The output also h
> > ad what seemed like a low voltage level (1 volt p/p). I called Ten
> Tec
> > about the sig level, but they didn't know what it should be. (More
> on that
> > later) Another Ham who had PLL board problems strongly suggested
> that I
> > re-heat suspect connections on the board. I did this (in fact, I
> hit every
> > connection on the board) and the radio worked for 2 days. While it
> was in
> > the working state, I scoped the PLL output and saw it change with
> the
> > up/down buttons. The voltage level was 1 volt p/p in the working
> state, so
> > I now knew that was correct. For the next few days, the radio would
> work
> > then not work. I tried to "make it fail" with heat and cold, but
> those
> > didn't seem to make a difference. During this process, I made a few
> notes
> > and drawings of various waveforms and levels around the board.
> > Unfortunately, 3 weeks have passed and some of those notes don't
> make any
> > sense to me now. Here are the ones that do: 1) At the junction
> labeled
> > "Test point" (duh...go figure) on the P
> > LL schematic: When working, and the rig set to 40 meters, it had a
> 100
> > mv sine wave riding on a 325 mv DC level. (I forgot to record the
> > freq). When failing, it was nearly at ground potential (less than
> 15 mv),
> > with no sine wave. 2) At U4, pin 5, with the rig working, I saw 775
> mv when
> > on 40 meters. I didn't record it in a failed state. 3) At R11 and
> R12,
> > with the rig working: You should see a 5 volt level, with
> negative-going
> > spikes to ground, every 100 usec. 4) U5, pin 6, with the rig
> working: 133
> > Mhz signal. I can't remember if it was square or sine. 5) U4, pin
> 7, with
> > the rig working: 2 v DC 6) U4, pin 1, with the rig working: 3.5 v DC
> > "Sometimes it's better to be lucky than good" While beating on
> components
> > to try make it work, I noticed that a slight tap on L12 could make
> the rig
> > fail or work. I re-heated the connections to L12, (including L12's
> case to
> > ground on top of the board) and the radio has been fine since. That
> was
> > over 2 weeks ago. I even got brav
> > e enough to put it all back together several days ago and it's
> still
> > working. Hopefully, it's been put to bed. Later, Joe
> >
> >
> > -----Original Message-----
> > From: Mike <w4mjr at att.net>
> > To: k8mp <k8mp at aol.com>
> > Sent: Wed, Nov 11, 2015 8:48 pm
> > Subject: Re: Ten tec omni 6+
> >
> > OK Joe that would be great. I like my 564 and miss it when not in
> use. I
> > moved the Hercules II over to my ICOM 751A for the time being.? Ok
> Joe look
> > forward to your repair info. Thanks agn. Mike W4MJR
> > Sent from my ALCATEL ONETOUCH A564C
> > On Nov 11, 2015 7:33 PM, k8mp at aol.com wrote: You jogged my brain
> and
> > yes, that was me Mike. I fixed it myself with help from the guys on
> the Ten
> > Tec reflector.
> > It involved removing one of the boards (PLL board, think) and
> > re-heating EVERY connection (top and bottom) with an iron (and add
> new
> > solder if necessary)
> >
> > I'll look over my notes and get back to you with the
> details,
> > probably tomorrow.
> > Later, Joe
> >
> > Sent from AOL Mobile Mail
> >
> >
> > -----Original Message-----
> > From: Mike <w4mjr at att.net>
> > To: k8mp <k8mp at aol.com>
> > Sent: Wed, Nov 11, 2015 07:36 PM
> > Subject: Re: Ten tec omni 6+
> >
> >
> > 602606e" Sorry Joe but I might have you mixed up
> for
> > someone else. I have a ten tec omni 6 plus and started losing audio
> sound.
> > It would come back in and then go back out. I could put it on the
> 160 meter
> > band and hear an AM station but could not make it out what they were
> > saying.? I replaced the 3 volt battery backup and did a reset but
> nothing
> > changed. Anyway Joe I have been reading so much about trying to
> figure out
> > what was wrong before I send it in to ten tec for repair.? Anyway I
> thought
> > I had read on the contesting.com about you and your omni 6 plus. I
> know
> > it had to be an old thread. I just didn't pay any attention to the
> date. If
> > I have you mixed with someone else problem I appolize.??????????????
> > Thanks, mike w4mjr
> > Sent from my ALCATEL ONETOUCH A564C
> > On Nov 11, 2015 5:14 PM, k8mp at aol.com wrote:
> > Hi Mike, Can you refresh my
> memory
> > by pasting the details into an email?
> > Thanks, Joe
> >
> > Sent from AOL Mobile Mail
> >
> >
> > -----Original Message-----
> > From: Mike < w4mjr at att.net>
> > To: k8mp < k8mp at aol.com>
> > Sent: Wed, Nov 11, 2015 12:46 PM
> > Subject: Ten tec omni 6+
> >
> >
> > Joe I am having the same problem with me 6+
> as you
> > had with losing the audio. This might be old stuff because I was just
> > searching thru the web and saw where you were looking for answer
> about your
> > rig. Did you get yours repaired and what was the cause.? Thanks, Mike
> > w4mjr Sent from my ALCATEL ONETOUCH A564C
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
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