Just demonstrating the sensitivity of the R828D tuner in the RTL-SDR Blog v4 using SDR# v1919. You can see it is receiving signals with no rf gain and no agc's. Does not take much rf gain to achieve a listenable signal. It will still have imaging from overload. That's when one must lower the rf gain.
SDR# RTL-SDR Blog v4 Is Sensitive on HF
- Thread starter sunwave
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funnyfarm299
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What kind of antenna are you using?
The only one that I find to work in my small apartment. A short center fed dipole. Two wires measured equally at 276cm. Each is connected to a terminal connection on the Nooelec Balun 1:9 v2 which has the metal enclosure. Feed line is 10m of RG-174. Later after that video upload I added the Nooelec LaNA HF v2 with metal enclosure. I took advantage of the low noise floor at 3.7db RF Gain and recorded it. I also have the Nooelec Flamingo FMBC notch filter in line between the LNA and balun. Works well.
It is that low noise floor that makes the LNA shine. Hence the name implied Low Noise Amplifier. It wants a low noise floor. If I was to get greedy I would defeat the purpose of the LNA. Imaging from overload and the dongle's internal noise level will drown out the weaker signals if I was to increase the RF Gain in SDR# too much.
WWCR is usually too strong for it because Oklahoma is one of the prime reception areas of WWCR. I can hear WWCR under WRMI on 7570khz. The only way to overcome that kind of signal overload is switch over to my RSP1a then voila! Overload imaging gone!
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