Tx antenna switch locks

[KC7NOA]

when i switch to antenna no to lo i lock up ....

have not tried Hi yet ....

Ok ... so select the antenna port before starting ... i show no output on display ... and cant modulate yet ...

is antenna selection functional yet?

[f4exb]

What is the source plugin concerned? LimeSDR?

[KC7NOA]

Im sorry ....

Yes LimeSdr and Ubuntu 18

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From: f4exb notifications@github.com Sent: Wednesday, July 4, 2018 11:40:22 PM To: f4exb/sdrangel Cc: KC7NOA; Author Subject: Re: [f4exb/sdrangel] Tx antenna switch locks (#194)

What is the source plugin concerned? LimeSDR?

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[f4exb]

It works perfectly fine. You need to add a modulator to see something happening.

[KC7NOA]

once i start the radio on 146.52 with no offset .. i cant add a modulator .... nothing responds on the GUI

I can pick up a signal -- just a carrier -- and once i force the GUI to close and restart sdrangel the carrier stops after the Lime is init'd

[f4exb]

Is this a Lime-Mini or Lime-USB? Is it connected to a USB-2 or USB-3 port? What sample rate do you use?

[KC7NOA]

Its a LimeSDR usb ,,, i keep sample rate as low as i can ,,, i set Rx to lowest it will go ....

Tx @1Msps .... iv tried lower with same effect ....

Hardware decimation to 1 and software at anywhere from 1 to 16. Low antenna on Lime (0,0) ....

Would it be better to use Tx on Lime(0,1) ?

Usb2 port ... i can Rx arounf 13M per sec with hardware at 1 and Software at 8 or 16 easy ... that's 7Ms/s ...but when trying tx i keep it low (also have left it alone)

There is a Tx blip when i have a NFM active when starting the radio There is a carrier when starting the radio with out a modulator, then adding a modulator will still be active -- but nothing is captured from the microphne goes out as modulation -- flat carrier. if i change anything -- even trying to stop the Tx radio/thread it seems to lock up and needs a ctrl-c ...

is there an option for building to show more debug information ?

System monitor is always low .... especially on an Intel i5 dual core (laptop)

I get same things on Odroid-C2 as my Laptop Dell E5500

[KC7NOA]

I am also now using a Quad core Q8400 and i still get NO Tx .. and usually no GUI activity after the stop (reverse of play/start) antenna change ...

I don't see any warnings or anything when the freeze up occurs ...

[KC7NOA]

Ok .. i have loaded limesuite onto a quad core Q8400 that has 4gig ram and a 1333 fsb ...

I still get no tx ... but for half a second or less on the screen

[KC7NOA]

Myriad RF Discourse

28 DAYS LATER

freebil Mar '17 Hello. I would like to transmit a sinusoidal waveform and see it in an oscilloscope. I found LimeTxDemo.pothos in https://github.com/myriadrf/LimeSDR_Workshop/tree/master/pothos16 but I did not succeed. I tried both tx1_1 and tx1_2 but it seems that it does not work.

diferential Mar '17 Pothos worked for transmit but it often crashed on my windows machine. After tens of restarts in 30 minutes I got tired of it and switched to gnuradio under Vmware + Ubuntu which is much more reliable.

Sample gnuradio flow that works for me:

Foxtrot-2017-03-28-01-04-05.png1440x900 103 KB

1 YEAR LATER

Kc7noa 8d Anyone get Tx yet ?

N1JEZ 8d Yes, with SDRangel and LimeSDR#.

adim 7d Transmission has been possible ever since the LimeSDR was released. There are lots of modes and standards which can be used: FM, AM, SSB, simple digital voice with Codec2, amateur television (DVB-T2, S2 etc.), GSM, LTE and lots of others. The easiest way to start is to learn GNU radio which has almost all of the components required for a medium complexity Tx/Rx project. I wrote a sinple GNU/Linux application (90% based on GNU radio) to demonstrate how easy it is now to do SDR thanks to existing open source chunks of code. You can look at the source code to understand how things are glued together, but if you want to do something by yourself, then you have to write your own code.

I would not recommend looking into software defined radio if you are not willing to learn about… software :slight_smile:

73, Adi, YO8RZZ

1 Like

martywittrock 7d @Kc7noa - Mike,

Just like N1JEZ mentioned, LimeSDR (and I think the Mini) are on SDRAngel and transmitting fine. Take a look on YouTube and look for ‘LimeSDR SDRAngel’ - - I have about 3 - 5 videos out there of the LimeSDR transmitting on HF and VHF with SDRAngel on SSB and FM. It’s been working for awhile now and the quality of the receive and transmit is on-par with other SDRs that are being used as transceivers. If you need more info let me know - I can get you started on that. I was hoping that SDRConsole would be ready by now since Simon started working on transmit for that almost 16 months ago, but got derailed on other paying gigs (Apache Labs among others) and hasn’t taken up the LimeSDR again since then. I think it’s safe to say that effort is in deep freeze right now, but SDRAngel continues to improve with a web interface being the latest add-on (which I think will really blow the doors off anything that’s out there).

Just so you know - 73 de Marty, KN0CK

Kc7noa 7d I do need help …

I have a few different computers to try … though the laptop is going to be the easyest to software upgrade …

All USB2.0 … can you try what ever you have working with USB2.0 and not USB3.0 ?

1 Like

martywittrock 6d @Kc7noa - Mike,

For the first time in about 2 1/2 months I got the LimeSDR set back up on my PC (Windows 10 platform running ZADIG driver) and had SDRAngel running on USB 2.0 (I do have USB 3.0 on this machine, but I tried it to see if I could even get it to work). As it turns out, USB 2.0 works fine with the Lime using SDRAngel on receive. I haven’t tried transmit yet, but I’ll try it out later and let you know how it goes. I’m on vacation today and getting ready for a camping trip over the weekend, but I will report back at the very latest on Sunday night if I don’t have it earlier.

Stay tuned…73 de Marty, KN0CK

Kc7noa 4d Quick question, go by this time when you see this I bet you would have already tried it when you start the TX when you hit the play button does your data throughput hang out at 100% or does it stay lower. I guess you’re fifo buffer… I guess that’s what it’s called . I can run 12 megabits a second through my USB on receive and then have 0% fifo but on transmit the thing just pegs so I just kind of curious if that’s what you’rs does as well

Kc7noa 1m Well … i had purchased a PCIe to USB3.0 card and it comes as a PCMCIA to USB3.0 adapter/bridge …

Obviously I can’t use that on my desktop but it did install it into my laptop.

My laptop now maxes out around 55Ms/s on the USB bus … slightly above what this misstake card shown on it.

I can Tx now … its odd though …

If i run the sample rate down to 1.5Mb/s i can still Tx/Rx … and that sample rate is well within the USB2.0 specifications … but using a USB2.0 port i get about 1/4 second of Tx waterfall and stops …

I thought it was my display hardware or drivers for display were the issue but if that was the case there would be no diference on USB3.0 / USB2.0 and it clearly works on USB3.0