*Hello Gary,*
* Wade here KJ4WS. Here is what I found after looking at
the service manual. The 40 Meter Crystal is Y4. Sorry but I didn't go deep
enough to get the frequency. You could have a bad crystal but here is what
I have been running into lately. 1. An Omni 6 opt 3 that would not do a
proper CW transmit offset ( Hello Jim ) 2. Another Omni 6 Plus which 30
Meters would fall out after a few minutes of operation. ( Hello Jim again )
3. Grady/AD4GB, had an Omni 6 which had no 20 Meters. 4. My Paragon, a bit
different because this was a problem with the Low Pass Filter Board. And
the list goes on and on where missing bands have been concerned. Gary, each
of these problems was a PIN Diode. In your case it is D12 on the OSC-Low
Mixer Board. If you look at page 6-14 of the Manual or page 52 of 132 of
the .PDF on your computer. You will see Connector 82. ( osc-low mixer board
) The band switching is done by applying a positive voltage to the proper
diode to activate the proper crystal. Sorry but I don't have an Omni 5 for
reference but. If you place the rig on 160 meters, one end of the connector
will have a positive voltage. Switching to 80 meters the second pin in will
be switched on and the voltage on the end pin will go away. And on 40
meters it will be the third pin in on this connector. I am sorry to have to
drag this out this way but I can only tell you to start at 160 for the pin
on one end. And then 80 will be the second one over and 40 the third pin
in. So when you switch to 40 meters just make sure that the switching
voltage is there and stable. If that voltage is there, Don't Check
... REPLACE ... D12. D12 is the PIN switching diode for the 40 meter
crystal. These switching diodes have been a very common problem/repair for
me lately. Looking at the board and where the first crystal is closest to
the edge of the board, it will be the third crystal and diode over. There
is an R7 680 ohm resistor across the crystal but, we have never had a
problem with one of these. Most any Small Signal Silicon Diode will work in
this circuit. Looking at the parts list for D12 or a call to Ten Tec should
get you a diode or suitable substitute. I only ask that you report back and
tell us how this advise works out for you. Ten Tec, Gary and Paul have been
wonderful to me over the years. I still believe that Ten Tec has the best
radio's and service of ALL Brands. Since Bob/K4TAX, stopped working for
others, we have been trying to do good work for those he sends my way. I
love these radio's and hate to see one unrepaired. Ten Tec just has to
choose between the Labor Cost per hour and the value of the rig. My Shack
costs me nothing and time/labor costs mean nothing to me. Retired/Disabled
since 2008, I can watch reruns of Star Trek, Dr. Who or because of my Miss
Brenda, Days of our Lives. Or make a little extra and still do something I
love. Well???? I sure hope we have been of some help. Please keep me
informed as to what you find.*
* 73 from Wade/KJ4WS*
On Thu, Aug 27, 2015 at 5:33 PM, gary mankoff <garyjm88@gmail.com> wrote:
> WHATS GOING ON WITH THE TT SERVICE GUYS ...I SPOKE TO THE HEAD GUY THERE
> AND HE DENIED HE EVER PRESCRIBED A FIX FOR THE "HOT" AF CONTROL ON MY OMNI
> 5 WHICH IS ON THE TT WIKI WITH HIS NAME ON IT AND I ASKED HIM ABOUT 40
> METERS DISAPPEARING AFTER ABOUT ONE HOUR ... HE TOLD ME ITS UNREPAIRABLE
> ...
> WHOA!!!
> IS THIS WHAT HAPPENS WHEN YOU INHALE TO MUCH SOLDER SMOKE?
> GETTING A BAD TASTE FOR TEN TEC ...
> A REAL BAD TASTE!!!
> 73...
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
--
*Living one day at a time with Jesus as my Savior. But, still having Fun.*
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|