Архив за 08.07.2018

RTL-SDR Discussion • need to relocate RTL-SDR away from computer

Hi All,

I discovered, the hard way, that having a quarter wave antenna on the RTL-SDR doesn't work-the computer makes to much rf noise.

So, I need to relocate the RTL-SDR away from the computer....actually I could relocate the antenna-but coax is expensive and lossy in terms of being able to copy weak-ish signals.

So, I bought a high end USB cable and expected the RTL-SDR to run when connected via the cable. It didn't::> Not only did the RTL-SDR not run, my 1GB USN HDD also didn't run. Both run perfectly when plugged directly into the computer USB port though.

The cable I bought is rated for USB 2 at full bandwidth, double shielded, and has 2 ferrite bead on the cable to knock down the noise on the shielding shell (one on each end of the cable).

The symptom is that neither device is recognized. It's as if the new USB cable was an open switch.

I'd actually like to move my RTL-SDR about 50 feet, but I'm not quite sure how to do it. Sure wish the RTL-SDR had an ethernet connector instead of a USB connector!!!!

There are USB to ethernet adapters, but they are expensive and problematic. There are USB cables with repeaters built in, but they limit the throughput-so the RTL-SDR can's send/receive data fast enough for it to function.

I would think a wideband analog rf transmitter might make a wireless solution, which would be nice!! However, I am not sure the RTL-SDR would do well with even a low powered transmitter anywhere near it::>

How do I extend the distance between the comp-uter and the RTL-SDR, without breaking the bank?

BB

Statistics: Posted by W1ABA — Sun Jul 08, 2018 11:49 pm


RTL-SDR Discussion • Re: SDR# scanner plugin

IC!

I can't imagine the time to lock the clock multiplier PLL's would allow scanning at any decent rate. I have experience with clock multiplier based local oscillators connected to rotary encoders, allowing the user to 'tune' using the hand instead of the mouse. Even for frequency excursions of a few KHz, the audio output 'skips' and the OP needs to wait for the PLL to lock. My guess is that the RTL-SDR has dual clock multiplier VFO's, and both of them need to have locked PLL's to get a proper audio output.

GL.

BB

Statistics: Posted by W1ABA — Sun Jul 08, 2018 11:25 pm


RTL-SDR Discussion • Re: Unidentified chip replacing the R820T2

RTLSDRBLOG et al,

Not releasing the schematic does squat::>

The Chinese skim parts they manufacture for customers, customers who have GIVEN all the technical knowledge to manufacture and build the end product. The only way to be safe is to build the products in the US, which of course costs more::>

For instance, if the RTL-SDR was your company's design, you'd want to have the chips and the assembly work done in China. But, for them to do the job requires your company to give them all the technical knowledge necessary to do the job. This is the 'theft' part, they steal the design, make the parts and build the boards so that they can sell them themselves!

Hence, we see $9 RTL-SDR's on ebay, sold as unbranded and without tech support::>

How do I reach the admin directly, for a non technical matter related to the forums functionality?

Aloha, great forum incidentally!

BB

Statistics: Posted by W1ABA — Sun Jul 08, 2018 11:17 pm


RTL-SDR Discussion • Re: Schematic for RTL-SDR V3

I believe 5v and 3.3 volts are needed, and I thought I saw power conversion inductors on the PCB-so I assumed that those inductors were attached to switching supplies.

And, I thought I heard some chatter about the need to relocate them in order to improve the receivers sensitivity?

Perhaps I was mistaken-believe me, it happens.

Enjoy.

BB

Statistics: Posted by W1ABA — Sun Jul 08, 2018 11:04 pm


Dipole antenna help

Hi,

I've recently just got my hands on a NooElec NESDR SMArt and decided to build a small dipole antenna for 1090MHz ADS-B. However, even if the antenna is the right length (13.7cm), I cannot seem to get anything on 1090MHz but I do get some noise on 1039MHz. I'm using two stainless steel wires soldered to a RG-58 cable. Any help is appreciated.

submitted by /u/Puzzleheaded_Catch
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Klen10 До этого имел 2 (ДВА) подряд неудачных опыта заказа на E-bay у разных продавцов и магазинов брелков RTL-SDR gen.3…

orlexy пишет:
Klen10 До этого имел 2 (ДВА) подряд неудачных опыта заказа на E-bay у разных продавцов и магазинов брелков RTL-SDR gen.3 в железном корпусе: оба раза товар не приходил, трека не было, продавец и магаз...
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Широкополосный приёмник из DVB донгла - Страница #550

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Интересует фото платы, если не затруднит — сфотографируйте и покажите. Писал продавцам, никто не захотел присылать фото …

Klen10 пишет:
Интересует фото платы, если не затруднит - сфотографируйте и покажите. Писал продавцам, никто не захотел присылать фото платы :) Сделаем :) Заказывал не на E-bay, а на ALI. До этого имел 2 (ДВА) подря...
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Широкополосный приёмник из DVB донгла - Страница #550

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RTL-SDR Discussion • Re: RTL-SDR may burn a phone

Wow, my V3 only pulls 120 ma.. I wonder what yours was pulling?

Statistics: Posted by dlritter — Sun Jul 08, 2018 10:02 pm


Troubleshooting Help • SDR shows up with two bulk-in interfaces

I have two SDR's (A NESDR Smart, and a RTL-SDR v3) which were working fine three days ago. Last night my computer decided to do a windows update, which wiped out the drivers. No surprise there. But when I plug in either of the SDR's they show up as two bulk-in interfaces each (both in Device Manager and in zadig).
SDRcontr.jpg
Then when both are plugged in it shows up as four, Bulk-in (0) to Bulk-in (3).
DManager.jpg
I can still get them to work in SDR# by using the two that work. (The other two fail to start.) But Unitrunker has trouble figuring it out and can only get one of the SDR's running. So, I'm looking for help. Is there a reason for it showing up as two bulk-in interfaces? Can I fix it and recombine them back into one? I have already tried updating the drivers, removing/uninstalling the devices and reinstalling the drivers, restarting the programs, and my computer multiple times, and even reinstalling the USB drivers. I'm at a loss of what to do next.

Statistics: Posted by traceur — Sun Jul 08, 2018 9:49 pm


Comment on The Outernet Ku-Band LoRa Data Service by DB gain

This effort seems perfectly suited to censorship rather than as a means to bypass it, and is already pushing anti Trump sentiment. It is, however, technically interesting, despite the fact most villagers in 3rd world nations will not have easy access to receivers.

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