Search found 59 matches

by aurgathor
Mon Feb 25, 2019 4:30 am
Forum: Antennas
Topic: broken antenna
Replies: 1
Views: 679

broken antenna

The top of the included "23cm to 1m telescopic antenna" broke off after the second section-- is there an exact replacement available somewhere? (part number or link) Looking at eBay, comparable antennas are available from around $1.50 apiece, but the 1 m long antennas utilize 7 section vs. 5 for the...
by aurgathor
Wed Feb 20, 2019 8:18 pm
Forum: Other SDR Devices
Topic: Check out the specs on THESE receivers!
Replies: 2
Views: 4847

Re: Check out the specs on THESE receivers!

That could be the MSRP, and one could probably get one for a mere $50k or so nowadays.... :roll:

At my previous work place they've got a couple of R&S signal and spectrum analyzers, but I only got to use the ancient HP spectrum analyzers.
by aurgathor
Wed Feb 20, 2019 8:07 pm
Forum: Other SDR Devices
Topic: Hackrf one - increase RX-TX
Replies: 7
Views: 15552

Re: Hackrf one - increase RX-TX

LOL. ;) You can most certainly argue that an amplifier is an amplifier and you can use an LNA in both places, but what you normally want to use for TX is an RF power amplifier. https://en.wikipedia.org/wiki/RF_power_amplifier While *in theory* one can certainly make an amplifier that could work in b...
by aurgathor
Thu Feb 14, 2019 7:40 pm
Forum: Other SDR Devices
Topic: Hackrf one - increase RX-TX
Replies: 7
Views: 15552

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: 12053

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: 7
Views: 15552

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: 18
Views: 32409

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: 18
Views: 32409

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: 18
Views: 32409

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: 5
Views: 13983

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...