Date   

Re: do you need any testers simon for the rspdx

ian
 

still available :-)


Re: Beginner test Sdr Console Rtl2832U

Alan G4ZFQ
 

The rtlsdr.dll setting is ppm. The SDRC setting allows better.
Paul did not actually tell this group but he has one with a TCXO. RTL V3, Seller:- "<1 PPM temperature compensated oscillator (TCXO)
Once warmed up in a domestic environment these can be considerably better than 1 ppm stability.

Paul,

260Hz is not a large offset compared with the frequency 143050000Hz although you could get it closer.
For your purpose a long as you are tuned to the signal I would not expect exact precision to be necessary .

73 Alan G4ZFQ


Re: Beginner test Sdr Console Rtl2832U

jdow
 

The rtlsdr.dll setting is ppm. The SDRC setting allows better. The dongle drifts 1 ppm is you look at it too hard. So - use it in tolerant applications OR teach the application to be more tolerant.

They do NOT become stable in a room with a thermostat that has a 1.5 degree C dead band.

{^_-}

On 20191226 03:47:25, Siegfried Jackstien wrote:
Am 25.12.2019 um 15:21 schrieb jdow:
A 260 Hz error is very small, really. 260/143e6 is little less than 2 parts per million. You can improve it with the ppm setting to some extent. Usually it is not worth the effort at that level of error.
such a sentence from you?!?!
wasn´t it you that wants to have it exactly on the last digit ... with part per trillion if not better?!? (just poking a bit  ... grin)
i know the rtl sticks are not that really good to last few hertz ... but after a good warmup they become quite stable
happy xmas joanne :-)
greetz sigi dg9bfc

{^_^}

On 20191225 05:05:36, Paul Account Wright wrote:
Hi all,


ive tried moving the dotted line on screen by using calibrate but its not moving?

Assuming the *Graves* signal is the thick blue line of 145.050 *my signal* is 143.050.260 so my dongle has a large drift or offset ?



Re: Beginner test Sdr Console Rtl2832U

Siegfried Jackstien
 

Am 25.12.2019 um 15:21 schrieb jdow:
A 260 Hz error is very small, really. 260/143e6 is little less than 2 parts per million. You can improve it with the ppm setting to some extent. Usually it is not worth the effort at that level of error.
such a sentence from you?!?!

wasn´t it you that wants to have it exactly on the last digit ... with part per trillion if not better?!? (just poking a bit  ... grin)

i know the rtl sticks are not that really good to last few hertz ... but after a good warmup they become quite stable

happy xmas joanne :-)

greetz sigi dg9bfc

{^_^}

On 20191225 05:05:36, Paul Account Wright wrote:
Hi all,


ive tried moving the dotted line on screen by using calibrate but its not moving?

Assuming the *Graves* signal is the thick blue line of 145.050 *my signal* is 143.050.260 so my dongle has a large drift or offset ?


Re: Cheap RTL.SDR

M0ZEH <m0zeh@...>
 

It should show under usb devices in Windows.
Thanks Steve m0zeh 


Re: Beginner test Sdr Console Rtl2832U

jdow
 

A 260 Hz error is very small, really. 260/143e6 is little less than 2 parts per million. You can improve it with the ppm setting to some extent. Usually it is not worth the effort at that level of error.

{^_^}

On 20191225 05:05:36, Paul Account Wright wrote:
Hi all,
ive tried moving the dotted line on screen by using calibrate but its not moving?
Assuming the *Graves* signal is the thick blue line of 145.050 *my signal* is 143.050.260 so my dongle has a large drift or offset ?


Merry Christmas Simon and all!

Max
 

Happy Christmas to you Simon. Many thanks for all the tireless work and updates throughout the year.

Happen to know Simon is even working today. Take a break man, for goodness sake!

All the very best for 2020 too, and of course greetings to all other users of the SDR-Radio group!

73

Max


Re: Beginner test Sdr Console Rtl2832U

Alan G4ZFQ
 

ive tried moving the dotted line on screen by using calibrate but its not moving?
Try using the method on this page https://www.sdr-radio.com/Radios/RTLDongles


Re: Beginner test Sdr Console Rtl2832U

Paul Account Wright <ceauce@...>
 

Hi all,


ive tried moving the dotted line on screen by using calibrate but its not moving?

Assuming the Graves signal is the thick blue line of 145.050 my signal is 143.050.260 so my dongle has a large drift or offset ?


Re: Beginner test Sdr Console Rtl2832U

jdow
 

It might be a good idea to set the center frequency of the display t0 143.0 MHz and use the individual receiver tuning to set the receive frequency to 143.050 MHz.

In general with RTLSDR dongles performance will be best at 2.4 Msps. The digital receive process can improve dynamic range by several dB more that way compared to 250 kHz. If there are some loud hams around 144 MHz adjust the center frequency down 400 kHz or even 1 MHz. You can still receive 143.050 MHz that way with the ham station moved off to the side of the dongles synthetic filters. It may make 10 to 30 dB of difference.

You can adjust gain manually by setting it high - around 30 dB-ish. Then find a weak signal you can listen to. Reduce dongle gain setting step by step until one of the steps decreases the audible signal to noise ratio. Go back up one step and you're about as good as it gets.

{^_^}

On 20191224 13:02:37, ray roberge via Groups.Io wrote:
The signal looks like the Graves radar, as you suggested. Changing the bandwidth is as easy as clicking on the left, under filter.
You have the 3.2 kHz bandwidth selected (default under USB mode).
The almost vertical lines in some screenshots show a passing target at Mach 6 relative to your location and the Graves transmitter. Graves is a Passive radar in that it transmits a CW tone and by looking at the Doppler from various receiver locations, the target range is determined. To observe local targets, click the CW-U Mode and reduce the filter to 267 Hz for a +/- 500 meters per second,relative, Doppler target observation.
From your screen shot, it looks like the fluctuations in the carrier are nearby targets. Relative Velocity = Doppler frequency x 3e8 / (observed frequency * 2).
Once you calibrate the receiver ( -12 ppm off? ) you will have a better idea of the correct frequency, and Doppler! This SDR drifts a lot under temperature variations so be suspect of the absolute frequency even after calibration.
Have fun,
Ray WA1CYB


Re: Cheap RTL.SDR

jdow
 

The reason I am asking what VID and PID you installed is that rtlsdr.dll and all the trimmings come with SDRC these days. So if you try to create a definition for the dongle it should be found. Thinking of which you HAVE created a definition - had SDRC search for rtlsdr dongles and added the definition to its internal list?

{^_^}

On 20191224 07:56:46, Ken Underwood wrote:
I can see my problem now with SDR Console V3, have no driver, if i could only find which one i need then i think i could get things going
73
Ken


Re: Cheap RTL.SDR

jdow
 

Visit rtlsdr.com and get it through them new and working. I figure there is less chance of fraud. Or visit https://www.nooelec.com/store/ and get it through them new and working.

Both appear to be available on Amazon.
Nooelec: Search for
NooElec NESDR Smart v4 SDR - Premium RTL-SDR w/Aluminum Enclosure, 0.5PPM TCXO, SMA Input. RTL2832U & R820T2-Based Software Defined Radio
rtlsdr.com: Search for
RTL-SDR Blog R820T2 RTL2832U 1PPM TCXO SMA Software Defined Radio (Dongle Only)

I get prices of about $24 and $22 respectively here in the US.

{o.o}

On 20191224 07:49:45, Paul Gulliver wrote:
Ken
If you're think of starting again, another good dongle to look at is the RTL SDR V3 - available from ebay (several suppliers just search for RTL SDR V3 ) and for support for this dongle
visit https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/
I have 3 of theses dongles working 24/7 for several months without problems
Paul
On 24/12/2019 at 15:38, Ken Underwood <keng3sdw@... <mailto:keng3sdw@...>> wrote:
Thanks Paul mate very helpful
I have down loaded SDR Console V3, problem i have now is identifying the
radio i have from the drop down list
Without knowing what it is designed around then a mystery, think i will get
one from your suggestion from Amazon, at least there i will have some support
Thanks for the tip.
Have a good Christmas and happy New Year, to you and all the others on here
that offered some help.
73
Ken
G3SDW


Re: Beginner test Sdr Console Rtl2832U

ceauce@...
 

Thank you Alan, Jdow, Ray for the information, very much appreciated ;)
👍



From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of jdow <jdow@...>
Sent: Wednesday, December 25, 2019 6:01:50 AM
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Beginner test Sdr Console Rtl2832U
 
You can adjust frequency errors with the ppm adjustment. But for this use it
should not be needed unless you are trying to extract information from the
Doppler shift, not that I thing real meaningful information extraction is
possible given the nifty drifty nature of these dongles. But, they DO show you
the potentials for similar more advanced tools.

{^_^}

On 20191224 07:22:33, ceauce@... wrote:
> hi everyone,
>
> I’m. Beginner so apologies !
>
> ive not calibrated the rtl2832u.
>
> I tested my setup (inc 5 element yagi 2m) with the Graves Radar at 143.050. but
> found signal at 143.049.350 including tones and occasional blips that could be
> meteors?
> please see image below, am I on the right track ? Paul
>
> is t
>




Re: Cheap RTL.SDR

jdow
 

Both Nooelec and rtlsdr.com V3 dongles are good. (I suspect they are basically the same thing by now.) Both have more stable oscillators in them. And they work like a champ. (I have some early Nooelec dongles and two much more recent rtlsdr.com dongles.) I've had fair luck with other sources. One shipped a tiny dongle that had the tuner chip mounted cocked at an angle. It's only use able without the tuner. I use it for testing SW features that might damage a dongle.

Most of the recent dongles declare 0BDA 2832 and 0BDA 2838 for VID and PID. But there are dongles with different IDs.

Let's first establish what VID/PID you installed with ZADIG. (I hope you got it right and nothing else packed up and seems to have died.)

{^_^}

On 20191224 07:38:17, Ken Underwood wrote:
Thanks Paul mate very helpful
I have down loaded SDR Console V3, problem i have now is identifying the radio i have from the drop down list
Without knowing what it is designed around then a mystery, think i will get one from your suggestion from Amazon, at least there i will have some support
Thanks for the tip.
Have a good Christmas and happy New Year, to you and all the others on here that offered some help.
73
Ken
G3SDW


Re: Beginner test Sdr Console Rtl2832U

jdow
 

You can adjust frequency errors with the ppm adjustment. But for this use it should not be needed unless you are trying to extract information from the Doppler shift, not that I thing real meaningful information extraction is possible given the nifty drifty nature of these dongles. But, they DO show you the potentials for similar more advanced tools.

{^_^}

On 20191224 07:22:33, ceauce@... wrote:
hi everyone,
I’m. Beginner so apologies !
ive not calibrated the rtl2832u.
I tested my setup (inc 5 element yagi 2m) with the Graves Radar at 143.050. but found signal at 143.049.350 including tones and occasional blips that could be meteors?
please see image below, am I on the right track ? Paul
is t


Re: Cheap RTL.SDR

jdow
 

The dongle pictured does not look legitimate to me. It looks like something that was hand painted and contains who knows what. He might pass along the VID and PID that Zadig revealed for the device. I'll check if it is on the list of real rtlsdr dongles supported.

{^_^}

On 20191224 07:20:08, Paul Gulliver wrote:
Well £20 is not ** that ** cheap, I know it's a bit late now but for £18.50 you could have got a NooElec SDR, they have a good reputation, I have bought several NooElec branded items and all have been good.
https://www.amazon.co.uk/NESDR-Mini-Receiver-Compatible-Packages/dp/B00P2UOU72/ref=sr_1_5?crid=J9R1MLD4H1S4&keywords=nooelec+sdr&qid=1577200309&sprefix=noolec%2Caps%2C143&sr=8-5
I appreciate it's not helping you with your present problem.
If you are installing SDR Console perhaps you'll have better luck - just double check the drivers and make sure they are suitable for Windows 10
Paul
On 24/12/2019 at 15:05, Ken Underwood <keng3sdw@... <mailto:keng3sdw@...>> wrote:
No Paul only the UK seller said to search Sharp SDR and to download Zidag
driver.
The one from China, although posted from the UK is exactly the same but had
now instructions at all.
The for £20 what can i expect.
73
Ken G3SDW


Re: Cheap RTL.SDR

Dick
 

Hi Ken,

Have you tried pressing the run button?


73, Dick PA2015

 


Re: Beginner test Sdr Console Rtl2832U

ray roberge
 

The signal looks like the Graves radar, as you suggested. Changing the bandwidth is as easy as clicking on the left, under filter.
You have the 3.2 kHz bandwidth selected (default under USB mode).
The almost vertical lines in some screenshots show a passing target at Mach 6 relative to your location and the Graves transmitter. Graves is a Passive radar in that it transmits a CW tone and by looking at the Doppler from various receiver locations, the target range is determined. To observe local targets, click the CW-U Mode and reduce the filter to 267 Hz for a +/- 500 meters per second,relative, Doppler target observation. 
From your screen shot, it looks like the fluctuations in the carrier are nearby targets. Relative Velocity = Doppler frequency x 3e8 / (observed frequency * 2).

Once you calibrate the receiver ( -12 ppm off? ) you will have a better idea of the correct frequency, and Doppler! This SDR drifts a lot under temperature variations so be suspect of the absolute frequency even after calibration.

Have fun,
Ray WA1CYB


Re: Beginner test Sdr Console Rtl2832U

Alan G4ZFQ
 

Hi Alan, I`ve just found a help file in sdr console to calibrate dongle will try that tomorrow or should I continue with speclab?
Paul,

If you use rmob then I guess any suitable SDR program will work. I presume it is just a matter of piping the audio to rmob. BUT rmob seems to be an old program that may not work in modern Windows. Check this.
Should I be using a 3.2kHz filter in sdr console? it seems to be stuck on ?
Bandwidths are adjustable although long echoes can cover a wide bandwidth.
I'm not experienced, you need more advice or research.

73 Alan G4ZFQ


Re: LimeSDR-USB HF TX

kg7swp@yahoo.com <KG7SWP@...>
 

Happy Holidays.

Ed

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