Search found 46 matches

by aurgathor
Thu Feb 14, 2019 7:40 pm
Forum: Other SDR Devices
Topic: Hackrf one - increase RX-TX
Replies: 5
Views: 3958

Re: Hackrf one - increase RX-TX

If something is available anywhere, the first 2 places to go to look for them are eBay and Amazon. :!: Using the search terms of "LNA 433 MHz" I got 16 hits on eBay for 2 - 3 different types of LNAs. Looks to me one type ($40+) comes with a SAW filter, the others (under $20) probably don't. Note wel...
by aurgathor
Thu Feb 07, 2019 3:20 am
Forum: RTL-SDR Discussion
Topic: home use server setup to support RTL-SDR dongle
Replies: 3
Views: 3169

Re: home use server setup to support RTL-SDR dongle

What is your budget?

Here at work we are using lots of SFF (Small Form Factor) Dell Optiplexes in test stations, and they are very nice for what we use them. Depending on configuration and whether you want something new, or used is OK, they can run anywhere from around $100 to $1000 or so.
by aurgathor
Wed Feb 06, 2019 2:48 am
Forum: Other SDR Devices
Topic: Hackrf one - increase RX-TX
Replies: 5
Views: 3958

Re: Hackrf one - increase RX-TX

Unless you really know what you are doing, you probably don't want to mod your board. But to get an "increased RX", there a number of different LNAs available from various sources. However, normally you would also want a band pass filter or two to go with it. Also, remember that antennas can make a ...
by aurgathor
Sun Feb 03, 2019 9:54 pm
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 10726

Re: Long USB-cable vs long antenna-cable?

"I won't waste time or money investigating that as an option then :)" I forgot to mention that they were cheap dongles from eBay and more expensive dongles may perform significantly better, but make sure that anything expensive you try has a money back guarantee. One issue I identified with them was...
by aurgathor
Wed Jan 30, 2019 3:30 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 10726

Re: Long USB-cable vs long antenna-cable?

"I know of a max. of 40 m (~131 ft) if you cascade active USB 2.0 cables, like Delock Kabel USB 2.0 active 20 m USB cable Art.-No. 82690 price ~30 €. I used one cable with a Haupauge video grabber, but I never checked for RFI. " That may be possible -- I just do not know for sure, and have never tri...
by aurgathor
Tue Jan 29, 2019 2:30 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 16
Views: 10726

Re: Long USB-cable vs long antenna-cable?

Last year I've measured the current draw of several SDR's (RTL-SDR v3, some Nooelec, HF+, etc.) and posted the numbers here. Both v3 and Nooolec were a bit over 300 mA, and while that's not a terribly high current draw (the USB 2.0 spec is 500 mA), the voltage drop can be significant over 10' or 15'...
by aurgathor
Tue Jan 29, 2019 1:14 am
Forum: Off-Topic
Topic: SDR Heat Management
Replies: 2
Views: 3985

Re: SDR Heat Management

"The operating temperature range of the board is 0-25°C. " Where did you get this information? That's very hard to believe since ambient temps can often exceed 25°C, and I see very little reason why a solid state SDR would have such a low upper temperature limit. It may become somewhat less accurate...
by aurgathor
Mon Jan 21, 2019 11:19 pm
Forum: RTL-SDR Discussion
Topic: new rtl-sdr (RTL2832U) not hearing or seeing any ham radio on spectrum
Replies: 5
Views: 4323

Re: new rtl-sdr (RTL2832U) not hearing or seeing any ham radio on spectrum

Can you listen to some FM stations? If so, then the hardware is functional. What kind of antenna do you have for 70 m? The bundled antennas won't work too well close to the lower end of SW. Your portable scanner most likely have a ferrite antenna for that frequency. If you meant 70 cm, try using an ...
by aurgathor
Sat Jan 19, 2019 12:40 am
Forum: RTL-SDR Discussion
Topic: OTA TV
Replies: 7
Views: 4837

Re: OTA TV

Analog channels 1 - 6 were in the 44 MHz to 88 MHz range, well within the capabilities of older analog radios, although with the exception of Ch6 (87.75 MHz) and maybe Ch5 (81.75 MHz) they were likely to be outside of the tuning range of usual FM radios, unless they were using the OIRT band (65.8 MH...
by aurgathor
Thu Jan 17, 2019 2:44 pm
Forum: RTL-SDR Discussion
Topic: RTL-SDR v3 VERY HOT and poor reception
Replies: 5
Views: 4554

Re: RTL-SDR v3 VERY HOT and poor reception

They do get warm, but I don't know where is the point where they can be considered defective -- rtlsdrblog should answer that for you. In general, RTL-SDRs are very sensitive wide open receivers, so any nearby radio source can desensitize them even if it is nowhere near the frequencies you are inter...