Great real world testing. I noticed using only the telescopic your noise mostly disappeared. Was waiting for you to again use only the telescopic out in the corner of your yard to find that same result.
Put up a horizontal skywire loop. Very RFI resistant with greatly increased reception over a longwire. You'll be surprised at the difference in S/N ratio.
A big down side to LED lights is the switching noise that results from the electronics in the units. While fluorescent lights also have a problem with magnetic ballasts is usually isn't quite a bad, but still there and some fluorescent lamps use electronic ballasts as well... Sometimes the good old fashioned Edison incandescent is best for us!
Thank you. I was getting kinda upset because I just bought a short wave radio and wasn't picking up anything regardless where I was in the house. My baofeng was picking up other stuff just fine (the baofeng doesn't pick up short wave frequencies) so I was thinking maybe I bought a bad unit. I stepped outside the house into the freezing cold and all of a sudden I was picking up all sorts of stuff. If I was with in about 5 feet of the house everything would cut out. I need to look into some sort of antenna solution and in my case I don't think the attic option or "short-wire" option will work because I have a very noisy home. . . . . . something with a shielded coax coming into the home.
Regarding noise: When I switch on my D-808 with volume wheel at minimum I can hear a clearly white noise on all bands the same. It´s like a background noise of the electronics. When I increase the volume for example in FM steroe with a strong station the noise seems to vanisch but I think it is due to the louder musik. But if I sit in a very quiet room near to the radio and want to hear it also with low volume this noise is disturbing me. Do you also notice this noise and do you think it is normal? The radio app in my 5 year old smartphone doesn´t make any noise like this.
Hi Mario, I have a Radiwow R108 which is designed and manufactured by the same Xh-Data company, using a slightly different DSP (Silab4734 rather than the 4735 in xh-data) Actually I have the same problem, when I turned down the volume to 0, I can hear hissing noises on all bands, on FM the background noise (at volume 0) is even stronger. I contacted the customer service with a recorded audio file, they sent to their engineers, they said that it's an inevitable heat noise (residue) due to DSP and aux circuitry design. I don't have a PL660, it's not based on DSP, so maybe will have less background residue noise, I do have an "analogue" 9700DX (which uses traditional ICs to decode, not DSP), it doesn't have such as audible residue noise as my DSP-based Radiwow. I don't know the situation of radios using other brand DSPs (non Silab 4743/4735)... It is annoying since I use it to listen to FM classical music...
The noise you describe is pretty typical for many types of audio amplifier circuits. You will find that more expensive hi fidelity music systems do not suffer from this, but many less expensive radios do. It is usually normal unless it is at a very strong level that overtakes the signals you are listening to.
I was not comparing performance of the radios but was just using two portables I had on hand to observe the noise levels in different ways (each has a different display, etc).
The main problem where I live is from noise generated within my home, from LED lights and from some appliances. You also find noise from many of the plug-in "wall wart" style power supplies. Loops are great antennas and in fact I did put up a large outdoor loop antenna, and I do love it. But the biggest help has been to have it far away from the house and to run quality cable to it with proper matching. Noise is not a problem for me usually.
Great real world testing. I noticed using only the telescopic your noise mostly disappeared. Was waiting for you to again use only the telescopic out in the corner of your yard to find that same result.
Put up a horizontal skywire loop. Very RFI resistant with greatly increased reception over a longwire. You'll be surprised at the difference in S/N ratio.
A big down side to LED lights is the switching noise that results from the electronics in the units. While fluorescent lights also have a problem with magnetic ballasts is usually isn't quite a bad, but still there and some fluorescent lamps use electronic ballasts as well...
Sometimes the good old fashioned Edison incandescent is best for us!
Agree! The LED lights have wreaked havoc for me, I had no idea how noisy these things were till we moved into the new house.
@@wf7ihomebrew Indeed that and many wi-fi routers make horrible RFI in the HF bands.
Seems like the Tecsun has the better noise floor and quieting levels too.
I was studying noise levels at different locations, not noise differences between receivers. Was just using two receivers I had in hand
Thank you. I was getting kinda upset because I just bought a short wave radio and wasn't picking up anything regardless where I was in the house. My baofeng was picking up other stuff just fine (the baofeng doesn't pick up short wave frequencies) so I was thinking maybe I bought a bad unit. I stepped outside the house into the freezing cold and all of a sudden I was picking up all sorts of stuff. If I was with in about 5 feet of the house everything would cut out. I need to look into some sort of antenna solution and in my case I don't think the attic option or "short-wire" option will work because I have a very noisy home. . . . . . something with a shielded coax coming into the home.
Yes, coax helps tremendously with line noise or other noise from the house. Same problems here.
Regarding noise: When I switch on my D-808 with volume wheel at minimum I can hear a clearly white noise on all bands the same. It´s like a background noise of the electronics. When I increase the volume for example in FM steroe with a strong station the noise seems to vanisch but I think it is due to the louder musik. But if I sit in a very quiet room near to the radio and want to hear it also with low volume this noise is disturbing me. Do you also notice this noise and do you think it is normal? The radio app in my 5 year old smartphone doesn´t make any noise like this.
Hi Mario, I have a Radiwow R108 which is designed and manufactured by the same Xh-Data company, using a slightly different DSP (Silab4734 rather than the 4735 in xh-data) Actually I have the same problem, when I turned down the volume to 0, I can hear hissing noises on all bands, on FM the background noise (at volume 0) is even stronger. I contacted the customer service with a recorded audio file, they sent to their engineers, they said that it's an inevitable heat noise (residue) due to DSP and aux circuitry design. I don't have a PL660, it's not based on DSP, so maybe will have less background residue noise, I do have an "analogue" 9700DX (which uses traditional ICs to decode, not DSP), it doesn't have such as audible residue noise as my DSP-based Radiwow. I don't know the situation of radios using other brand DSPs (non Silab 4743/4735)... It is annoying since I use it to listen to FM classical music...
The noise you describe is pretty typical for many types of audio amplifier circuits. You will find that more expensive hi fidelity music systems do not suffer from this, but many less expensive radios do. It is usually normal unless it is at a very strong level that overtakes the signals you are listening to.
I would compare receivers with weaker stations to see sensitivity better.
I was not comparing performance of the radios but was just using two portables I had on hand to observe the noise levels in different ways (each has a different display, etc).
big problem noise now days tecsun R9700DX SW
Cool! 😀👍👍
What state you in? I’m in Mn
At 17:29 he says he’s near the Blue Ridge pkway in Virginia. Hope that helps.🙂
Put up a loop. Problem solved.
The main problem where I live is from noise generated within my home, from LED lights and from some appliances. You also find noise from many of the plug-in "wall wart" style power supplies. Loops are great antennas and in fact I did put up a large outdoor loop antenna, and I do love it. But the biggest help has been to have it far away from the house and to run quality cable to it with proper matching. Noise is not a problem for me usually.