#Pc vlf receiver manual
The RCA Receiving Tube Manual says that the plate load for the 6V6, is around 2,000 ohms, which would be a decent match for the sound card's line-in. I found an old output transformer from a tube era receiver. I don't know what the input Z is, but again making an assumption, it's likely to be in the 600 to 2000 ohm range. However, in my case the receiver is software, using the PC's sound card line-in jack as the antenna connection. I think your assumption of the antenna output Z being 50 ohms is likely correct, as the antenna is intended to be used with conventional receivers which have 50 ohm antenna jacks. That means the pri and sec inductance would need to be at least 10 MilliHenries If it is 50 Ohms, then you just need a 1:1 transformer that works in the audio range. Although might need a transformer into your computer. It's worth some experimenting,ītw, I don't see what transformer you are describing, just inductors. I don't want to discourage you, just pointing out what you need to work on.
#Pc vlf receiver series
that's over 1000 ohms in series your 50 ohm radio. But wait there is another problem, the amps output cap has 530 ohms of impedance at 3kHz and again there are two. Then the problem becomes the resonate frequency of the inductor. But even with a 10 MilliHenry inductors you are only getting close to 200 ohms. You might try increasing the value of the 470uh inductor. This is in parallel with your radios 50 ohms, and would lower the output signal considerably. I assume were talking 3 to 30kHz? This site says it goes down to 10kHz so it's close, but my quick jump to conclusion- the 470uh has 30 ohms of impedance at 10kHz and the two 100nf caps to ground have 80 ohms impedance, that vectorily adds to about 85 ohms, but, there is one of that at each end. That said, I suspect you could get a more signal out of it with some modifications. I see several videos of people using it as is, so go for it. I've been thinking of replacing the toroid RF transformer with a proper AF transformer, which would also create a better impedance match. In contrast, the Planar Disk is almost free and it performs quite well in an indoor setting.Has anyone here tried using a PA0RDT Mini Whip antenna with a sound-card based VLF receiver? My concern is that the toroid core galvanic isolation transformer of the Bias-T may not pass the "audio frequency" signals. Just because an antenna "is sold" does not mean its good or even marginal. Please verify your dongle is working with a good antenna before complaining that you cannot receive something. Here is a great, broadband Planar Disk Antenna that outperforms most commercial antennas of similar size for under $65-75 and can be built in a half hour or less by beginners with less than $10 in parts. See our wiki with tutorials and other resources including a Quick Start page to verify your dongle works.
#Pc vlf receiver driver
The rtl-sdr project page Source of the rtl-sdr driver software and hub for its continued development. Resources - Please read this first - before posting! Max sample rate: 3.2 MS/s (2.6 MS/s in practice).Frequency range : 24 - >1760 MHz (100 KHz - 24 MHz in direct sampling mode).Typical specs (some depend on specific tuner): All rtl-sdr compatible devices employ the RTL2832U as an ADC and USB controller, but different RF tuners may be used. "rtl-sdr" is a generic term for cheap USB digital TV (DVB-T) receivers that use the Realtek RTL2832U chipset, which can function as general purpose software defined radios (receive only). While originally dedicated just to the rtl-sdr project, relevant legal content related to general SDR, RF and similar projects is also welcomed.įeel free to ask questions but please check the wiki first. Use self / text posts for your immediate inquiries and general posts.Ī subreddit for the low-cost, DIY software defined radio (SDR) community.
#Pc vlf receiver mod
Link / Image posts are now sent to the Mod Queue before appearing.