[TenTec] Omni C tx board 80714
barry.n1eu at gmail.com
Tue Sep 5 08:43:02 EDT 2017
For carrier null, you also need to adjust R11 on the 80449 SSB Generator
board (step 12 on p3-41), as well as R14 on 80713 TX Mixer board (p3-43).
It would be prudent to first adjust the carrier oscillators (p3-40 and
p3-41). If the carrier oscillators are not accurately aligned, carrier
null will be impaired further.
I suspect it's very possible that there was a change to the board that
would explain what you're seeing.
73, Barry N1EU
On Tue, Sep 5, 2017 at 8:04 AM, Shawn Upton via TenTec <
tentec at contesting.com> wrote:
> Picked up a desk mic, but while listening on a separate receiver I noticed
> a fair amount of carrier. At first I thought 60Hz pickup, but I have it
> with out any mic wire connected (just a connector with ptt tied to gnd). So
> I went to adjust the carrier balance, but am confused. The manual has a pic
> showing the tx board relative to all boards; it looks like what I have. Two
> trims and a large shielded inductor. And no ic. But the page for the 80713
> shows a 1496(? off memory right now) ic and only one trimpot. Which is not
> what I have.
> It looks like a running change, from a discrete design to an ic based one?
> Regardless, how do I adjust?
> shawn uptonkb1ckt
> TenTec mailing list
> TenTec at contesting.com
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