I have been noticing Encoder noise while tuning around the bands, I can see it in the waterfall and hear it in the receiver while tuning. Has anybody else noticed this? I might try installing some .1mfd caps from the encoder legs to ground to see if it quiets things down, can't hurt.
The other potential noise source is the display.? Are you using the stock display with the stock software?? If not, would you please share your configuration?
Yes, I'm using the stock display and the stock firmware. I need to hook up my DE and see if I'm experiencing the same problem, it's not a huge thing as it goes away when I stop tuning, just an observation really.
Does it sound like spike noise, like the synthesizer moving through
frequency steps?? Capacitors across the encoder terminals wouldn't
help that at all.? Or is it more like wideband noise??
If you can hear it, any chance you could make a recording of it
available?
That sounds undesirable to me ... tuning is how you find stuff you
wan to listen to.
Yes, I'm using the stock display and the stock firmware. I need to
hook up my DE and see if I'm experiencing the same problem, it's
not a huge thing as it goes away when I stop tuning, just an
observation really.
It sounds more synthesizer noise, It's really noticeable if I disconnect the antenna and then tune across the band and it's most prevalent on the higher frequency bands like 20 meters and up. I hooked up my DE running the same V2 software on the same power supply and antenna and found it to be quiet, no tuning noise at all.
This noise is radiated from the I2C bus during the frequency change. Increasing pullup resistors may help. When I opened up PL-880 and tried to hook up to the I2C bus to sniff, I've found that the pullups there are 47k. But this only works for very short bus.
I received my #349 yesterday, and have noticed the same irritating behavior from the tuning knob. I also discovered that bumping the case or the encoder (hard to tell which, as it's not consistent) causes the entire audio stream and waterfall to go quiet. Sometimes it's come back after more tapping, while at other times I've had to re-start the program.
Joel Caulkins/N6ALT