¿ªÔÆÌåÓý

  1. BITX20
  2. Messages
Single Messages Topics Expanded Polls

Re: uBITX and ft8

 

I took a different approach.? Using a battery for my BITX and turning the
mains power off, convinced me that most of the noise was originating
from local in-house sources.? I checked noise from each appliance and
found several local culprits that could be quieted down a significant
amount.? This is a different kind of noise, but I was able to bring an S-9
background down to S-2.? Now I can start to seriously look at external
noise and how to make the BITX more resistant to that problem.

Arv
_._


On Fri, Oct 8, 2021 at 12:22 PM Rafael Pinto [PU1OWL] <rafaelgcpp@...> wrote:
On Fri, Oct 8, 2021 at 04:30 AM, Ashhar Farhan wrote:
A more aggressive front end filter migth eliminate the noise substantially. The ubitx front end is wide open. While tuned to 21 Mhz, it? can overload from a 100 khz noise from an smps.?
The bitx40, being a monobander had the luxury of a triple tuned front end. You could add something similar and see if the noise drops.
I had this weird idea of having some external BPF on the uBitx for 15m, but never went ahead with it. Thinking again it could be rigged just by the T/R relay, but then I would lock the uBitx...

Join [email protected] to automatically receive all group messages.