[TenTec] 544 Tritn Whine

[Al Gulseth]

This is just off the top of my head (can't find anything in a quick web 
search), but I seem to remember something about aging/deteriorating bypass 
caps (especially electrolytics) in the display subsystem being a source of 
noise on the digital Tritons and early Omnis.

73 es GL, Al

On Sat January 9 2016 10:36:21 pm Kirk Smith via TenTec wrote:
> Hello to all...My 544 Triton seems to have a high pitch whine, at low
> volume, with the RF Gain up or down. I've read a review on E-Ham about a
> mod that eliminated the noise.....they removed the c5 cap 750pf on the
> logic board . Well, my schematic does not show this cap & that there's no
> actual cap between pin 17 of the IC to Vcc. I also don't see that cap on my
> board. Anyway, I listen at low volume & needless to say, the whine is
> beginning to make me whine!! Any ideas before the radio heads back to TT?
> One last thing, I tested another 544 next to it, & was quiet....my ser # is
> 544-1618, the quiet rig is 544-1355.Thanks, Kirk
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec