See if the PA transistors nuts, bolts and screws are all sung on the heat
sink...I had a Paragon that had loose hardware...due to running a lot of
rtty.
--------------------------------------------------
From: "Mike Bryce" <prosolar@sssnet.com>
Sent: Thursday, February 16, 2012 7:23 AM
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Low (to no) Power Out Omni D--han'nt given up yet
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.
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