RTCM/Voter pulse noise
Hi All, Not sure if I've posted this here yet? I've had a pulsing high frequency noise component on my transmit audio out of my VOTER boards. Has anyone come across this? Seems to be in similar time with the status LED, but I assume it's being generated from a chip somewhere. Here is a video of the issue - https://www.youtube.com/watch?v=BJIzuMvpupk Whilst not particularly annoying and only heard at very low level, it is peculiar. I've also tried injecting audio into another spot on the radio. Also tried swapping GPS units, but could possibly be 1PPS noise? Hayden
Did anyone get a chance to take a look at this for me? I'm interested as to where this issue is occurring and if anyone else can hear it on their voter board or RTCM? Hayden On Mon, May 8, 2017 at 4:04 PM, Hayden Honeywood <haydenph91@gmail.com> wrote:
Hi All, Not sure if I've posted this here yet? I've had a pulsing high frequency noise component on my transmit audio out of my VOTER boards. Has anyone come across this? Seems to be in similar time with the status LED, but I assume it's being generated from a chip somewhere.
Here is a video of the issue - https://www.youtube.com/watch?v=BJIzuMvpupk
Whilst not particularly annoying and only heard at very low level, it is peculiar. I've also tried injecting audio into another spot on the radio. Also tried swapping GPS units, but could possibly be 1PPS noise?
Hayden
I don't have any noise like that with voter boards or RTCMs. My first thought is that you may have a ground issue, or may not have your audio wires shielded from your power/logic wires that are running in the same cable. Have you tried other boards or RTCMs with the same cables? Did you use the exact components to build the boards or did you substitute any components, such as the regulators or capacitors? I always use 2 separate cables into the common connector, one cable carries shielded audio and audio ground and the other carries power, logic levels (cor, ptt, etc) and power/logic ground. If you have this issue with both the boards and the RTCMs then IMHO, it must be a cable issue. (or a nut loose behind the control panel, just kidding :-) Chuck On Wed, May 17, 2017 at 2:35 AM, Hayden Honeywood <haydenph91@gmail.com> wrote:
Did anyone get a chance to take a look at this for me? I'm interested as to where this issue is occurring and if anyone else can hear it on their voter board or RTCM?
Hayden
On Mon, May 8, 2017 at 4:04 PM, Hayden Honeywood <haydenph91@gmail.com> wrote:
Hi All, Not sure if I've posted this here yet? I've had a pulsing high frequency noise component on my transmit audio out of my VOTER boards. Has anyone come across this? Seems to be in similar time with the status LED, but I assume it's being generated from a chip somewhere.
Here is a video of the issue - https://www.youtube.com/watch?v=BJIzuMvpupk
Whilst not particularly annoying and only heard at very low level, it is peculiar. I've also tried injecting audio into another spot on the radio. Also tried swapping GPS units, but could possibly be 1PPS noise?
Hayden
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participants (2)
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Chuck Henderson -
Hayden Honeywood