Архив за 09.11.2017

Ввели неплохой сервер SDR.hu, от 0 до 30 МГц, в режиме Hi-Fi. Советую сервер Химки!…

SDR.hu
Ввели неплохой сервер SDR.hu, от 0 до 30 МГц, в режиме Hi-Fi. Советую сервер Химки!

Comment on XTRX: Soon to be crowdfunding Mini PCIe based TX/RX SDR by Sergey

You’re right! We’re working hard to get into 2.5W power budget defined by miniPCIe standard and it’s tough. So far it was 3 revisions of the board and now it works stable! Will post more data about temperature/power consumption when we accurately measure it.

Comment on XTRX: Soon to be crowdfunding Mini PCIe based TX/RX SDR by Sergey

Thank you for the point!

PCIe is also more reliable and using DMA and zero copy interface it’s possible to get lower latency and lower CPU utilization. mini-PCIe by standard is x1. We’re using optional pins (that was reserved for second lane initially but didn’t go) and routed them, using special converter board it’s possible to get x2 connectivity. Having PCIe 2.0 x2 you can get up to ~7.2Gbit/s or near 900 MB/s.

Wikipedia says “Accounting for the encoding overhead, the raw data throughput is 4 Gbit/s, and the specification considers it reasonable to achieve 3.2 Gbit/s (0.4 GB/s or 400 MB/s) or more in practice”. In practice I’ve never seen something goes beyond that.

We’re aware of the initial LimeSDR design issue.

Comment on XTRX: Soon to be crowdfunding Mini PCIe based TX/RX SDR by Roger T

Low Latency, High speed/bandwidth are main advantage.
But the board looks very tight and I do not know if the XTRX try to perform full potential, it might get super hot and may be unstable. You probably make your own or buy heat sink for sure .

Comment on XTRX: Soon to be crowdfunding Mini PCIe based TX/RX SDR by snn47

While I like the idea of a SDR-TRx for a notebook, I am wondering if the height is equivellant to the max. height and if it will allow insertion in a notebook slot.
While it is necessary to keep the height low enough to all insertion in a miniPCIe slot in a notebook, without some more stable coax connectors at the end of the card like SMA ,I fear the use will be shortlived.
From the slides at https://drive.google.com/file/d/0B-CV_07uSBIuV3pjSVhHdW9RLVE/view the card is only intendended for external use on the shown adapter.

Comment on XTRX: Soon to be crowdfunding Mini PCIe based TX/RX SDR by Sergey

It supports SoapySDR, GNU Radio.

You’re correct the Lime firmware is dependent on Altera FPGA. We’re using our own FPGA implementation that allows us to do many interesting things.

подскажите пожалуйста какой сдр взять чтоб без переделки принимал от 100кгц (мой принимает от 22мгц)…

подскажите пожалуйста какой сдр взять чтоб без переделки принимал от 100кгц (мой принимает от 22мгц)

Давно уже интересует меня один вопрос — а если сравнить как работают в одних и тех же условиях,на одну антенну : свисток…

Alex7236 пишет:
Давно уже интересует меня один вопрос - а если сравнить как работают в одних и тех же условиях,на одну антенну : свисток,не важно какой,синий,или V3 , и КВ трансивер , Yaesu FT-450D или же ему подобны...
читать полностью...
Широкополосный приёмник из DVB донгла - Страница #528

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RTL-SDR Discussion • Worth a switch to the Stratux RTL-SDR?

Howdy -

Total newbie here, so apologies ahead of time if I make some massive misstep.

Two years ago, I picked up a no-name USB-Mini RTL-SDR device (here's the original auction) to add to the bag of goodies I carry around every day. I've been using it with SDR Touch on Android and it works amazingly well.

The big drawback, as noted in this thread is that these devices tear through battery life.

A google search brought me to the Stratux RTL-SDR page which talks about it being specifically low powered.

Does anyone have any idea if this low power requirement will translate into noticeably better battery life when used in an Android context?

Also, any idea what I'd be giving up? I carry the device as a nod to emergency prepardness, as the first thing that goes in the Washington, DC area when there's any sort of unusual 'event' is the cell phone grid. Fortunately, that use isn't a frequent occurrence, so I mostly just use the radio for goofing around (say listening in on the nearby Airport ATC).

The Stratux is priced quite reasonably, so if there's a chance this will help me in the battery life department I'll almost certainly pick one up (and if folks are curious, I can report my findings). But if it's not going to make any difference, or going to set me back in terms of functionality, I'd love to spare myself the hassle.

Thanks for the help,
Ben

Statistics: Posted by benjisimon — Thu Nov 09, 2017 8:19 pm


Comment on xaVNA: Kickstarter for a $200 Open Hardware VNA by 2ftg

At £352.00 (£422.40 incl VAT) Or 462.00 usd or 554.00 usd with VAT the cheapest VWNA variant costs more than double the price of XAVNA. Hardly “abt the same cost”.
https://www.sdr-kits.net/index.php?route=web/pages&page_id=68_68

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