[TenTec] Low (to no) Power Out Omni D--han'nt given up yet

[Mike Bryce]

Rick, 

Scott, is right.

Although you are getting two watts from the PA, you need to have more from the LLD.

The fact that you're not drawing current indicates you're not making the PA work. If you were drawing current and nothing was coming out, then you'd have a shorted transistor or two.

It is still possible that you have a failure in the PA, but those transistors are a bear to get to.

When an solid state PA is assembled, it's built from the pcb upward like a building is assembled from the ground up. If one or both of the transistors are bad, then you have to un-assemble the entire PA to get to the bottom transistors. It's labor intensive and after you're done, right now it's a crap shoot as to wether or not that's the problem.


This weekend I'll pull one of my Omnis out of the pile and measure the LLD power into a 50 ohm load and I'll see about getting some wave form photos from the scope,


Now, I know this is a long shot, but if you had someone near by with a defunct triton 4 the pa is damn near the same as in your omni, a quick swap would tell you volumes.

Or...

do you own a qrp rig?

disconnect the omni's PA from the LLD and inject 3-6 watts into it from the qrp rig. Key the omni and you should see 30 to 60ish watts. (make sure you're one the same band!)

what you did would be to use the qrp transceiver as the LLD and allow the PA to to its thing. Yeah, there's all kinds of impedances mismatches, but it will work.

Mike, wb8vge


On Feb 16, 2012, at 9:53 AM, Rick - DJ0IP / NJ0IP wrote:

> Scott, rather than second guessing, or waiting for Paul to read this thread
> by coincidence and offer suggestions, why don't you compose a list of
> specific questions and call or email them to Ten-Tec.
>