开云体育

I notice while using headphones with my new UBITX that there is a low level hum in my headphones.? I only seem to notice this with the headphones at low volume.

Is there a fix for this?

Thanks

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73, W9KJO
Walter

On Wed, Feb 28, 2018 at 05:15 am, Thomas Smith wrote:

Hi Walter,

What are you using to power your UBITX?? If you are using a power supply plugged into your wall, this may be coupling 60 (50?) Hz noise into your rig.? If you are powering it from the wall, can you use a battery (even just temporarily) to see if that is the source?

Tom

On Wed, Feb 28, 2018 at 1:23 PM, Walter <W9KJO@...> wrote:

I notice while using headphones with my new UBITX that there is a low level hum in my headphones.? I only seem to notice this with the headphones at low volume.

Is there a fix for this?

Thanks

--
73, W9KJO
Walter

?

?

It is powered off the batteries from my solar system, 12vdc system used only for my ham radio station, no inverter (yet).? Four large deep cycle batteries charged by an MPPT Controller.? I check it for noise often.? I have a power supply on the batteries to make up for low charge at night but it was off at the time as that charger is disconnected by my Internet relays during the daytime.? I'm pretty sure there wasn't any noise introduced from my power supply,BTW

BTW, I am so impressed by the Solar System, now 2 years old, That I am going to build a second system to power much of my house in the near future.? These panels even provide charge under cloud cover, it drops from 15 amps to 3 or 4 amps but that is enough to keep the batteries at charge even when operating my station at 27 amp current draw with the batteries making up the difference.? The duty cycle is low enough, even while in digitial modes, that it keeps up on only a few amps.? I even use my 12vdc HF Amp while on solar power.? It's been amazing and reliable.

I do have a DC Boost Regulator installed in my UBITX to raise the PA Voltage to a stable 24vdc.? I thought this might be the noise so I disconnected it and used only the 13.8vdc from my batteries but the noise was still present.? So the boost regular it not causing the noise.

--
73, W9KJO
Walter