> On Sun, Apr 21, 2019 at 08:19:31PM +0000, Gary Buhrmaster wrote: >On Sun, Apr 21, 2019 at 9:27 AM Jan Ceuleers <[email protected]> wrote: > >> The audio defect is a clearly audible repetitive "whistling" noise, with >> a periodicity of about 1 second. This noise is not present on the audio >> signal that goes into the PVR. > >Just on principal, check the power supplies >(swap between the units that work and one >of the STB ones). And also check for ground >loops between the PC, the PVR and the >STB, which can result in all sorts of audio >artifacts (just go over the the audiophile >forums and discuss ground issues and >whines and whistles).
I agree with Gary here concerning noise. I purchased a Winegard TV preamplifier, for which are only encased in plastic. The other TV preamplifier I had at the time, a Channel Master encased in metal housing. Soon after purchasing/installing the plastic Winegard TV preamplifier on one of my array of outdoor TV/FM antennas, I encountered significant noise over the radio frequency spectrum heard on my ham/shortwave radios; a buzzing/whining sound. After a significant repetitive process of elimination of switching-off house circuits/breakers, I finally found the plastic Winegard TV preamplifier to be the culprit, and subsequently/immediately replaced with the likely better metal encased Channel Master preamplifiers. Rule of thumb, anything encased in plastic (or unsheilded) can become a noise or interference problem. Can also grab an assortment of ferrite cable clips, 5mm & 9mm, for prancing around and clamping to any cable ends (whether RG6, power, audio cable, ...) until you find the source. Sort of futile, but will minimize noise on some cables due to poor SNR manufacturing standards of products, and with hopes the ferrite clips may eventually find the source. Try using a (sensitive) shortwave or AM radio for finding any RF noise sources, but sounds more likely your noise source maybe more inline, or power source/feed. I've also seen high-end or pricey computer power supplies (PSU) cause noise, of which Corsair readily replaced. -- Roger http://rogerx.sdf.org/
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