Tim:
Me too. I can't leave anything alone.
Check and see if you have the filter mod. If the receive audio peaks at
too high a frequency, you need the mod.
Other fixes and mods that I know about:
Because of reliability problems, Ten-Tec replaced the MRF-476 drivers
and MRF-475 final with 2SC1969 transistors.
If you don't have the built-in calibrator, Mike Bryce WB8VGE has a kit
that will fit.
Likewise, the internal keyer can be duplicated because it is a simple
circuit or one of the many keyer-on-a-chip kits can be installed.
If you have low drive on 80 meters only, try peaking the "null" pot on
the osc/mixer/bandpass board, while transmitting into a dummy load. It
is best to do this with a 30 MHz 'scope, because Ten-Tec says that the
pot should be tuned for minimum waveform distortion.
One mod I'd like to add is an external digital display. The analog dial
could be replaced with a small digital display, but I wouldn't do this
because it would destroy the classic character if the rig.
73,
Bob WB2VUF
On 10/2/2012 9:32 PM, Timothy Randa wrote:
Thanks Bob...I guess I'm always looking to make things better
73 de Tim
On Tue, Oct 2, 2012 at 8:00 PM, Bwana Bob <wb2vuf@verizon.net> wrote:
Tim:
I'm not aware of any mods other than changing the caps in the audio filter
to correct a design error (the filter was tuned to the wrong frequency).
This is on the Ten-Tec wiki. I found bias adjust instructions on a British
web site. I don't know of any other mods.
73,
Bob WB2VUF
On 9/29/2012 12:44 PM, Tim Randa wrote:
Is there a web site with all the mods for the Century 22? I understand
the factory issued several service bulletins and have found some notes of
mods here and there on the web. Just hoping that there was one location
that might have all this info together.
73 de Tim K0FL
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