Date   

Re: Ferrite choke question

jdow
 

Jim is unusually experienced with audio cabling and hardware in high, that is really high, RF fields. He did sound for a theater located in a tall Chicago building that had very high power broadcast TV and FM stations on the tower above him. He made it work. I am most pleased to have had the chances I've had to meet him.

(I *WISH* the GD motherboard manufacturers would adopt some of this technology, including balanced audio connections, for their audio inputs and outputs. Balanced configurations are SO MUCH easier to work with. Absent that, if you have audio hum problems ROLLS makes a nice $30 or so stereo audio transformer isolation box. They have tamed a lot of hum problems around here and are cheaper than what you might make with the EXCELLENT Jensen audio transformers.)

No, I don't work for either of them. I've used their equipment and plan to get more as the maze here grows. Between Jensen's Bill Whitlock and Jim Brown our knowledge of audio wiring has grown dramatically in the last couple decades. Even the different dielectric constants of the two wires in professional audio wires causes emi and hum issues. You get different capacitance between teh wires and the shields. Both are top in their field.

Do visit Jim's site and read as much as you can understand and 6 dB more. http://www.k9yc.com/publish.htm (Brought to you by jdow's department of needless repetition deja vu department.)

{^_^}

On 20200719 04:54:17, Dave Cole wrote:
You all should also check out Jim Brown's site, K9YC at:
http://www.k9yc.com/publish.htm
The guy has probably a hundred very well thought out papers on ferrite use... His work is what most other work is based on.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 7/19/20 12:54 AM, Re Claudio wrote:
Dear All ,

                I am sure here you can find most of the answers you need regarding this problem and how to easily measure also with ham methods .

http://ve2azx.net/technical/BALUNS2013-ang.pdf

73- Claudio Re I1RFQ


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Perseus vs SDRC Software

George Stein - NJ3H
 

Greetings,

I have a basic question.  Comparing the Perseus using its native software with the Perseus using SDRC, I hear more noise on the SDRC program than on the Perseus program.

I am just curious why the hissing sound is louder and more prevalent on SDRC?

I have tried to make the settings between the two software packages as similar as possible.

I would have expected both programs to be very similar.

I have two pictures attached - The Perseus GUI and the SDRC GUI.

Also two audio files are attached - The Perseus and the SDRC versions.

I used 15.000 MHz WWV for the comparison.

By the way, I ran a similar comparison between the ELAD S2 software and SDRC.  The results were basically the same.

Any thoughts would be most helpful.

Regards,
George, NJ3H
Redmond, Oregon USA


Re: Pluto & SDRconsole no power on TX? #pluto

Peter Ide-Kostic
 

Hello Charlie,

Yes of course, these hacks were done a long time ago. I am using my pluto without any issues on 2M with SDRANGEL. I am 100% confident the issue is with SDR-CONSOLE, I am a new user so maybe there is a parameter I overlooked. I was looking for some TX gains settings for the plutosdr but could find any in SDR-CONSOLE (apart from the drive slider)

Regards


On Sun, Jul 19, 2020 at 5:38 PM Charles Suckling <g3wdg1@...> wrote:
Have you done the 'hack' to convert it to cover 144? 

Details here:


73

Charlie G3WDG 



On Sun, 19 Jul 2020 at 16:27, Peter Ide-Kostic <on7yi.pik973@...> wrote:
Hello,

I have the same problem. My pluto works file on RX (no issues) but when  I measure the output power with a spectrum analyzer, it is only -60 dBm..... with the drive set to 100%....The pluto is fine, I am sure...

Here is a screen picture and a screen copy of my spectrum analyzer

Regards
Peter

Attachments:


Re: Reading SDR Console WAV files into GnuRadio GRC Wave File Source #grc #gnuradio #limesdr #sdr-consolev3

Simon Brown
 

Hi,

 

Did you record a single WAV RF64 file? Many programs don’t support this, so make sure you don’t have this option enabled.

 

The SDR Console format is valid, just GnuRadio being lazy I guess but at the very least it should get as far as the fmt chunk.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Scott@...
Sent: 19 July 2020 21:12
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] Reading SDR Console WAV files into GnuRadio GRC Wave File Source #grc #gnuradio #limesdr #sdr-consolev3

 

I'm using SDR Console to capture a sporadic signal with a LimeSDR by waiting to see it then hitting the record button in the record dialog.  All seems to work well, but I need to start digging into this signal in GnuRadio, but when I try to open the file with the GRC 3.8 Wav File Source (currently just feeding a throttle & the Waterfall sink) I get file not valid errors:

  File "C:\Users\foo\wip\GRC\bar.py", line 110, in __init__

    self.blocks_wavfile_source_0 = blocks.wavfile_source('C:\\Users\\foo\\wip\\GRC\\19-Jul-2020 113853.285 2740.500MHz.wav', True)

  File "C:\Program Files\GNURadio-3.8\lib\site-packages\gnuradio\blocks\blocks_swig1.py", line 454, in make

    return _blocks_swig1.wavfile_source_make(filename, repeat)

RuntimeError: is not a valid wav file

This seems like the simplest possible thing to do and yet I'm stopped cold.  What am I doing wrong.  I'm sure this has been discussed and solved before, so I apologize that I was not able to find it while searching the forum or the documentation.

Love the program.  Great tool.  Lot of professional spit and polish here.


Reading SDR Console WAV files into GnuRadio GRC Wave File Source #grc #gnuradio #limesdr #sdr-consolev3

Scott@...
 

I'm using SDR Console to capture a sporadic signal with a LimeSDR by waiting to see it then hitting the record button in the record dialog.  All seems to work well, but I need to start digging into this signal in GnuRadio, but when I try to open the file with the GRC 3.8 Wav File Source (currently just feeding a throttle & the Waterfall sink) I get file not valid errors:

  File "C:\Users\foo\wip\GRC\bar.py", line 110, in __init__
    self.blocks_wavfile_source_0 = blocks.wavfile_source('C:\\Users\\foo\\wip\\GRC\\19-Jul-2020 113853.285 2740.500MHz.wav', True)
  File "C:\Program Files\GNURadio-3.8\lib\site-packages\gnuradio\blocks\blocks_swig1.py", line 454, in make
    return _blocks_swig1.wavfile_source_make(filename, repeat)
RuntimeError: is not a valid wav file

This seems like the simplest possible thing to do and yet I'm stopped cold.  What am I doing wrong.  I'm sure this has been discussed and solved before, so I apologize that I was not able to find it while searching the forum or the documentation.

Love the program.  Great tool.  Lot of professional spit and polish here.


Re: HF Antenna Query

Stu C <stu@...>
 

Another item i like is simple unmanaged switches with two fibre ports and 4/8/more copper ports, great for simple networking and even daisy chaining fibre (assuming 1.2G is enough)
https://www.aliexpress.com/item/32974181577.html
That company (Seven layer) has been fine for me, I've tried others with less success but DO EXPECT it to take a long time coming.

Another thing that is worth considering if you have real long run to cover is the SC connector Fibre Ethernet adapters, as they are used in a lot of places worldwide for network provision they can be amazingly cheap.
I have picked up a 100m single conductor external fibre (with metal strainer built in) for I think it was about £30 and as all I needed was about 10Mb data I got six! adapters "deal" for about twenty five.
The 100Mb ones are bit more, but even 1.2G not bad. Just don't look at the "brand" prices on Amazon, fibre is one of those things that takes a bit of practice to avoid UK rip off.

Excellent source - https://www.fs.com/uk/
Really aimed at business but have been fine for my small orders, Duplex Modules from about seven pounds, amazing range too!

A small caveat with "value" fibre items (mainly end of line) is that some older SFP sockets only support some speeds, it's much more universal now but I was looking for "USB to fibre" direct and the ones I got from China ONLY supported 100mb modules so rather then expecting a 1.25Gbps module to run slow I had to source some 100M. Those USB to fibre are an example of supply and demand, simple PCB and one chip, in the UK about £260! - China 100Mb tenth of that.

Stu


Re: HF Antenna Query

Stu C <stu@...>
 

Michael,

Easiest is to go Multimode duplex fibre and modules to suite.
I'm no expert mind but here is what I am using (Ubiquiti was a bit cheaper for the modules than Mikrotik and I don't think there was stock at the time)

E.G.
Amazon ASIN: B07MLDDVS4
Any multimode, duplex fibre of the right length should do, the higher the OM number the better the future proofing.

Modules Multimode duplex
https://www.wifi-stock.co.uk/details/ubiquiti_uf-mm-1g_2pack_sfp_module.html
(Pair) Quick code: #1209
Switches
https://www.wifi-stock.co.uk/details/mikrotik_rb260gs.html
Quick code: #573
Or consider the POE one, that way if you are powering an Item through it (like a raspberry PI with a simple DC-DC buck convertor) and you need to pull the power you can, remotely
https://www.wifi-stock.co.uk/details/mikrotik_rb260gsp_routerboard.html
Quick code: #700 
I use one of those in the shed to switch things and watch a single battery voltage.

You could of course run other types of fibre (and modules) but I find the Duplex Multimode offers just about the cheapest modules and the fibre itself is more obvious and less delicate than say a single fibre, single mode, of less than 2mm.
The hole you have to make is a bit larger than an RJ45 but only just.

I have to make a skype call so that is a bit rushed, will check it later

Stu


Re: Ferrite choke question

Ron Layton <micron327@...>
 

Thanks everyone for the links and info! I bought a selection of the Chinese made snap-ons on eBay so I hope the quality will be suitable. I need them for the 5VDCpower supplies for my XHDATA D-808 and MLA-30+ loop antenna. When I plug those in I get wall to wall noise on low HF and MW so I really hope they help. I notice the same problem when I plug the 9VDC wall wart into my beloved ATS 803a on the same bands.As far as my SDR I hope to cut down noise on the wimpy antenna feed line from the MLA-30+. Noise is not too bad on HF but it covers up a lot on MW. Right now I'm using the RTL-SDR v3 dongle and will soon add an amp. Thanks again and 73's.


Re: HF Antenna Query

Tom Crosbie G6PZZ
 

That’s very interesting Stu.

 

 

73 Tom G6PZZ

Nr Chesterfield | NE Derbyshire | UK | IO93he

HF250 | RSPdx | Sentinel 4 | RM50 | TR2

15m MLB | MTA | D707

 

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Stu C
Sent: 19 July 2020 17:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] HF Antenna Query

 

Either Cat6/7 OR add FT240-31 at both ends, good few turns.

Ethernet radiates 60kHz spikes everywhere in the right conditions, to the point I'm mostly fibre now (in a tiny house).
I once counted the clocks and there were about 14 here, in my house Chinese CCTV cameras being just unspeakble

The Large ferrite FT240 really do clean up the long runs and have enough beef to not get saturated in normal use.
Quite if your 80m constitutes normal use I'm not sure....
Running shielded cable will stop the ferrite interacting fully with the CM field so they are more effective on non.

What I'd do under thatch is a couple of fibre to ethernet adapters and a decent run of fibre.

Actually I'd buy two five port managed (CSS106-5G-1S) switches from Mikrotik, adapters and a 60m fibre - why? if he manage to run the CATx over a sharp object and it later sparks due to RF that is er, awkward....
If he later wants 10G from one end of the cottage to the other the fibre won't need replacing (just the kit at either end).
I know he won't do that for many reasons now but if it does'nt work, revisit this and I'll send wifi-stock.co.uk links.

Stu


Re: HF Antenna Query

Michael.2E0IHW
 

Stu,
Informative postings, thanks.
Could you post links to fibre and adapter info, please.

Michael 2E0IHW

On 19/07/2020 17:43, Stu C wrote:
...
What I'd do under thatch is a couple of fibre to ethernet adapters and a decent run of fibre.
...
Stu


Re: HF Antenna Query

Stu C <stu@...>
 

Either Cat6/7 OR add FT240-31 at both ends, good few turns.

Ethernet radiates 60kHz spikes everywhere in the right conditions, to the point I'm mostly fibre now (in a tiny house).
I once counted the clocks and there were about 14 here, in my house Chinese CCTV cameras being just unspeakble

The Large ferrite FT240 really do clean up the long runs and have enough beef to not get saturated in normal use.
Quite if your 80m constitutes normal use I'm not sure....
Running shielded cable will stop the ferrite interacting fully with the CM field so they are more effective on non.

What I'd do under thatch is a couple of fibre to ethernet adapters and a decent run of fibre.

Actually I'd buy two five port managed (CSS106-5G-1S) switches from Mikrotik, adapters and a 60m fibre - why? if he manage to run the CATx over a sharp object and it later sparks due to RF that is er, awkward....
If he later wants 10G from one end of the cottage to the other the fibre won't need replacing (just the kit at either end).
I know he won't do that for many reasons now but if it does'nt work, revisit this and I'll send wifi-stock.co.uk links.

Stu


Re: HF Antenna Query

Allan Isaacs
 

Thanks Jim

If we have trouble I’ll get him CAT6. At least the holes in the ceiling will be there by then.

You can see us at BH23 8DU. You can just about see my mast for the 80m inverted V on the chimney.

Allan G3PIY

 


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Jim Smith G0OFE
Sent: 19 July 2020 16:31
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] HF Antenna Query

 

I'd be using Cat 6.



CAT5 is unscreened and I had RFI problems when using it and poor network performance when using it to carry HD quality. Switched to CAT6 which is screemed. QRM gone and bombproof performance.

If he is using CAT5, thats probably asking for trouble.

================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for


Re: Pluto & SDRconsole no power on TX? #pluto

Charles Suckling
 

Have you done the 'hack' to convert it to cover 144? 

Details here:


73

Charlie G3WDG 



On Sun, 19 Jul 2020 at 16:27, Peter Ide-Kostic <on7yi.pik973@...> wrote:
Hello,

I have the same problem. My pluto works file on RX (no issues) but when  I measure the output power with a spectrum analyzer, it is only -60 dBm..... with the drive set to 100%....The pluto is fine, I am sure...

Here is a screen picture and a screen copy of my spectrum analyzer

Regards
Peter

Attachments:


Re: Pluto & SDRconsole no power on TX? #pluto

Charles Suckling
 


On Sun, 19 Jul 2020 at 16:27, Peter Ide-Kostic <on7yi.pik973@...> wrote:
Hello,

I have the same problem. My pluto works file on RX (no issues) but when  I measure the output power with a spectrum analyzer, it is only -60 dBm..... with the drive set to 100%....The pluto is fine, I am sure...

Here is a screen picture and a screen copy of my spectrum analyzer

Regards
Peter

Attachments:


Re: HF Antenna Query

Jim Smith G0OFE
 

I'd be using Cat 6.


CAT5 is unscreened and I had RFI problems when using it and poor network performance when using it to carry HD quality. Switched to CAT6 which is screemed. QRM gone and bombproof performance.

If he is using CAT5, thats probably asking for trouble.

================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF


On 19/07/2020 12:01, Allan Isaacs wrote:

A bit of potential good news re my HF interference from Ethernet-over-mains adaptors.

Whilst installing a new graphics card for my noisy neighbour I noticed he already had a wi-fi extender behind his old monitor, which I was also swapping.

He reckoned he’d got it foc from BT when he’d complained his router wi-fi wasn’t reaching his TV set.

BT of course now claim to guarantee all rooms in your house will be covered by their router.. seems not in a thatched cottage with 2 foot thick walls and about 6 of these between his router and TV set.

Of course the extender was adjacent to his router and as such wasn’t sending wi-fi through the same 6 walls.

I suggested firstly he move the extender to be fed with a CAT5 cable to a different room and secondly get a another CAT5 cable to connect his TV.

He agreed and will run the new cables up into the loft and down to the extender and TV. The latter needs a 50m cable.

These are now ordered and I’m waiting for the RFI to finally clear up.

I’m not entirely sure about the 50m cable behind the thatch though… it will be at right angles to my inverted V… will this pick up my 80m transmissions?

Allan G3PIY


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Siegfried Jackstien
Sent: 14 July 2020 14:14
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] HF Antenna Query

 

a wifi extender instead of a powerline modem would solve that

sometimes even only move the main wifi router a bit left or right ... and/or placing a sheet metal behind it (as reflector to fire more towards tv set) could help

you can filter you own main against low frequency (and higher) noise ... that would lower conducted noise (also good for your own receiver)

 


Re: Pluto & SDRconsole no power on TX? #pluto

Peter Ide-Kostic
 

Hello,

I have the same problem. My pluto works file on RX (no issues) but when  I measure the output power with a spectrum analyzer, it is only -60 dBm..... with the drive set to 100%....The pluto is fine, I am sure...

Here is a screen picture and a screen copy of my spectrum analyzer

Regards
Peter


SDR-Console V3.0.23 - PlutoSDR- RF output power much too low (-60 vs -5 dBm) #pluto #adalmpluto #sdr-consolev3

Peter Ide-Kostic
 

Hello,

I am a new user of sdr-console V3.0.23
I was able to make it work very quickly with my plutosdr in reception mode, no issues at all, great software
It can transmit too, but the rf output power measured with spectrum analyzer is much too low, in the order of -60 dBm !! it should be between -10dbm and 0 dBm...!!!!!!!
I dont't understand what I am doing wrong, I did not see any TX gain settings in the software so I am really lost
Any advices would be welcomed ? Should I upgrade another software on ùy windows 10 PC ? Is there any specific dependency ?

Regards
Peter


Re: Ferrite choke question

Dave (NK7Z)
 

Jim has a lot of very good antenna!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 7/19/20 5:12 AM, Allan Isaacs wrote:
I notice Jim has two 80m dipoles at right angles, a top band dipole plus an
86 foot vertical in his back yard.
Allan G3PIY
-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Dave Cole
Sent: 19 July 2020 12:54
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Ferrite choke question
You all should also check out Jim Brown's site, K9YC at:
http://www.k9yc.com/publish.htm


Re: HF Antenna Query

Tom Crosbie G6PZZ
 

“I’m not entirely sure about the 50m cable behind the thatch though… it will be at right angles to my inverted V… will this pick up my 80m transmissions?”

 

Allan, I’m not usually vindictive, but does it matter? After all the grief he’s given you for years. 😊

At least the guy is being co-operative with your suggestions, which is the advantage of good neighbour relations.

I think you should go with what you’ve ordered but in hindsight, I might have gone with screened CAT5 or maybe CAT6.

Good luck in the meantime, and I trust you will document your progress in due course?  

 

73 Tom G6PZZ

Nr Chesterfield | NE Derbyshire | UK | IO93he

HF250 | Sentinel 4 | RSPdx | RM50 | TR2 | ATS 808

15m MLB | MTA | D707

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Allan Isaacs
Sent: 19 July 2020 13:02
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] HF Antenna Query

 

A bit of potential good news re my HF interference from Ethernet-over-mains adaptors.

Whilst installing a new graphics card for my noisy neighbour I noticed he already had a wi-fi extender behind his old monitor, which I was also swapping.

He reckoned he’d got it foc from BT when he’d complained his router wi-fi wasn’t reaching his TV set.

BT of course now claim to guarantee all rooms in your house will be covered by their router.. seems not in a thatched cottage with 2 foot thick walls and about 6 of these between his router and TV set.

Of course the extender was adjacent to his router and as such wasn’t sending wi-fi through the same 6 walls.

I suggested firstly he move the extender to be fed with a CAT5 cable to a different room and secondly get a another CAT5 cable to connect his TV.

He agreed and will run the new cables up into the loft and down to the extender and TV. The latter needs a 50m cable.

These are now ordered and I’m waiting for the RFI to finally clear up.

I’m not entirely sure about the 50m cable behind the thatch though… it will be at right angles to my inverted V… will this pick up my 80m transmissions?

Allan G3PIY


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Siegfried Jackstien
Sent: 14 July 2020 14:14
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] HF Antenna Query

 

a wifi extender instead of a powerline modem would solve that

sometimes even only move the main wifi router a bit left or right ... and/or placing a sheet metal behind it (as reflector to fire more towards tv set) could help

you can filter you own main against low frequency (and higher) noise ... that would lower conducted noise (also good for your own receiver)

 


Fix in Lime Suite for LimeSDR Mini to correct low VCO bias current

W1RS
 

FYI - myriadrf has a post from andrewback at :
https://discourse.myriadrf.org/t/fix-in-lime-suite-for-limesdr-mini-loopback-test-failure/6311

"We had a number of reports of LimeSDR Mini boards intermittently failing loopback tests that are run by the LimeQuickTest utility. Upon investigation, it turned out that the VCO bias current for LimeSDR Mini was being set lower than it was for other boards, which was resulting in this error and possibly other issues. This has now been fixed in Lime Suite and for the time being it is recommended to build from source using the master branch. A new release is planned for the end of July and at this point updated packages will also be available."

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