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Hydrogen line receiver design

Hydrogen line receiver design

Hi guys!

I am working on a project to a scientific competition on the analyses of the speed of the galaxy. Since I got a small budget, half of the stuff that I am going to use on my design is going to be made by me. I already chooses the microchips and the next move is to start making the PCBs. Here is where I need your opinion. After spending hours and hours of research, I designed the schematic on the image. But I don´t know if it is correctly made and if the components are ideal. Can you give me a hand?

Basically I receive the signal with a parabolic antenna, block DC current that could be there with a small capacitor and send the signal to a small switch so I can use a match load (since this is scientific I need a way of comparing the signal). I use after a TAV1-331+ (the datasheet of everything is available) that is a transistor as a pre amp. Its range is 10-4000Mhz and I am going to make a PCB and a metallic enclosure. After, I choose a TAMP-1521GLN+ as a LNA for a small range of frequencies with a small noise figure. I use also a bandpass and again other LNA to increase even more the signal. For each of this chips I am going to design a PCB (they are actually simple to work with) and a enclosure. After this, I send the signal to the RTL SDR.

So....Hope you liked the circuit. Any ideas, toughs, problems with the circuit that you want to share? I really appreciate that. Thanks for all the help.

submitted by /u/MichaelAngelito
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6MSPS baseband recording into external storage media

I recently managed to pull semi-decent HRPT from weather sats, however my setup requires I do a baseband recording of each pass before decoding at 6MSPS. That's not that much data for a modern fast disk, but the laptop I use has a rather old 100GB SSD that can only fit two HRPT recordings and I'm pretty sure constant rewrite cycles like this are very damaging for it.

I tried re-routing the baseband from SDR#, first into a USB flash drive. That had its buffer filled after a few hundred MB, after which it just dropped all the remaining data. Then I managed to get the laptop's SD card reader working which seems to be a bit faster than the flash drive, but its buffer also filled up fast, after about 2GB of recording (a full HRPT pass at 6MSPS can be over 25GB).

I've now been thinking if I should rather buy an external USB 2.0 HDD. In theory, because the raw data all comes from a USB 2.0 SDR in the first place it should handle the 6MSPS write rate just fine, but I'm quite aware that the real-world performance may be quite different.

So I want to ask if anyone has experience with USB 2.0 HDDs and such high sample rate baseband recordings.

Also, if I buy a 3.0 drive that's backwards compatible, will that ensure that it's using the full capability of 2.0? Because I know that some storage mediums (particularly flash drives) actually are slower than the USB 2.0 protocol so they don't make full use of it. For example, the flash drive I used is 3.0-compatible but, as I mentioned above, couldn't handle more than a few hundred MB of baseband through a 2.0 port

(needless to say the laptop has no 3.0 ports)

submitted by /u/derekcz
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I have a RTL SDR and was interested in a LNA but what exactly does it do? My experience with amplifiers in amateur radio amplifies the RF signal going out, I’m assuming this makes the antenna increase in gain by added the LNA. Am I on the right track?

submitted by /u/sergeantMcAsshole
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New setup, SDRSharp just stops!

Hi Everybody,

This morning I have been trying to get SDRSharp v1.0.0.1732 working with my RTL-SDR. This is a Win10 64 install on an older HP Probook laptop.

Everything seemed to go smoothly... but SDRSharp just seems to quit after a time (usually within 10 mins) without warning.

This can be while it is in standby or if it is receiving. I can leave it running and then I turn my head back and it's gone! I've got two RTL-SDR dongles and it does the same thing with both.

Even with no RTL-SDR present it will quit on me after a random time (5-10 mins) of sitting idle.

Where do I begin to start diagnosing where the problem lies?


submitted by /u/original_lunokhod
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No output sound and error messages using DSDplus

No output sound and error messages using DSDplus submitted by /u/Nico_Briggs
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USB Driver refuses to work!

I'm looking for ideas about why SDR# continues to give "device not found" despite following standard procedure for fixing it (as I have done several times in the past). I'm on SDR# and just reinstalled zadig 2.5 and used it to replace WINusb 6.1.7600.16385 with (same) 6.1.7600.16385. Rebot Win8.1 (it's an older, SDR dedicated machine), fire up SDR#... "no device". Reboot Win 8.1, fire up SDR#, "no device"..... repeat (same result), repeat (same result).

Could this be a problem with .NET4.8? I recently updated to that but there might have been a problem with the install. Reinstalling now.... edit's later. (.NET says 4.8 is already installed).

This is, I'm sure, a common problem but I'm not having any luck finding a solution and I want to get my radio going again!

submitted by /u/LucidPlusInfinity
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Anyone else use Teflon tape to make sure none of the signal leaks out on your sma conneters

Anyone else use Teflon tape to make sure none of the signal leaks out on your sma conneters submitted by /u/joejoebinks693
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Disscussion about cooling.

Hi, I want to ask someone who is more experienced than me. Lot of people tryes to cool their RTL sdr V3 really hardcore, but isnt that bad for the temperature stable oscillator? . I think that oscillator heats it self to temperature and tryes to stay like that and if you try to cool it down the temp of the oscillator will be also off and may cause some problems. Am I right or not?

submitted by /u/mistrjirka
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An autism dad looking for some help with sdr

My son is 10 and is an eloper. Meaning he will run away any chance he gets. This is extremely dangerous as he doesn’t understand the potential consequences of say running into traffic.

I have two tracking units for him. One is an rf device he wears 24/7 and the other is a GPS/cellular device I attach to him when he leaves the house.

I’m a licensed ham radio operator and purchased specific equipment to be able to somewhat track the rf unit but he frequently gets a new device on a different frequency which makes it hard for me to track. Besides tracking the location of a weak rf signal (approximately .25-.5 miles range) is somewhat difficult without a beam/yagi antenna tuned to his current frequency, at least to my knowledge. Which would of course need to be small enough to be handheld.

Ideally I’d like to be able to somehow track/hack his GPS/cellular device. I realize this may not be possible. I also want to mention, I don’t own a rtlsdr or a hackrf at the moment but both of them are extremely intriguing to me. I’m more than likely going to buy a rtlsdr today so I can use it to identify and listen to nearby ham radio operators who aren’t using a repeater eg simplex. Any tips for this would be great as well.

Any help or advice would be greatly appreciated!

submitted by /u/seismicpulse
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Combining units for trunked radio

I just got my first unit in the mail. Two actually - the RTL-STR dongle and a Nooelec dongle. Had initially planned to compare and keep the better one, but after reading about using dual units for trunked radio, I'm wondering whether I should keep both, or send one back and get matching units. Is it an additional challenge for a beginner to use differently branded units together or doesn't it matter?

submitted by /u/viajegancho
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