Zero vs Low IF
Posted: Mon Dec 05, 2016 11:52 pm
I had to learn the hard way when to use Zero-IF and when to use Low-IF, during which time I was baffled.
I had been listening to the 40m band using the default Zero-IF. At some point I switched to the AM broadcast band, and found that when I tuned to one of my local stations (880Khz), set the filter to AM + Soft, I found that when exactly tuned to the broadcast station's frequency, the audio was terribly distorted.
If I switched to either LSB or USB, then audio became much clearer, but at a lower volume.
The main spectrum display showed that I was right smack in the center of the signal.
Thing is, I had been listening to the same station earlier with no difficulty.
Long story short, I found that switching to Low-IF fixed the problem. I must have switched the IF before listening earlier, but had forgotten that I had done so.
I'm still very new to the world of SDR, having been active exclusively on V/UHF bands, I was playing with an SDR dongle (NooElec RTL-SDR) before buying the SDRPlay RSP1, when I started listening to the HF bands.
While SDRUno has quite a plethora of features to learn, I have found it much more to my liking than any other software.
I had been listening to the 40m band using the default Zero-IF. At some point I switched to the AM broadcast band, and found that when I tuned to one of my local stations (880Khz), set the filter to AM + Soft, I found that when exactly tuned to the broadcast station's frequency, the audio was terribly distorted.
If I switched to either LSB or USB, then audio became much clearer, but at a lower volume.
The main spectrum display showed that I was right smack in the center of the signal.
Thing is, I had been listening to the same station earlier with no difficulty.
Long story short, I found that switching to Low-IF fixed the problem. I must have switched the IF before listening earlier, but had forgotten that I had done so.
I'm still very new to the world of SDR, having been active exclusively on V/UHF bands, I was playing with an SDR dongle (NooElec RTL-SDR) before buying the SDRPlay RSP1, when I started listening to the HF bands.
While SDRUno has quite a plethora of features to learn, I have found it much more to my liking than any other software.