Date   
Re: Newbie material on HF+

Pete Smith
 

But how do you "set" full scale?  Clearly right now it is not correct. I'm looking for a measurement scale for my noise level and signal strengths that is comparable with other SDRs and hardware radios.

73, Pete N4ZR
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster.
On 4/5/2018 7:10 PM, David Eckhardt wrote:

If you have an S-9 signal which is -73 dBm and you have set dBFS to 0 dBm, the dBFS should read -73 dBm.  If you have set full scale to -20 dBm, the dBFS should read -53 dBFS.  Likewise, if you set the dBFS to -73 dBFS, the dBFS should read 0 dBFS. 

Dave - WØLEV

Virus-free. www.avast.com

On Thu, Apr 5, 2018 at 8:23 PM, Pete Smith <n4zr@...> wrote:

Please pardon the extreme newbie questions - I bought an Airspy HF+ recently, intending to use it on the IF of my K3 for spectrum display.  Of course, the K3 is off at Watsonville, so I've been experimenting, comparing the Airspy with a Red Pitaya and a QS1R.

From what I've seen I like SDR# a lot.  Is there anywhere an SDR# manual specifically for the HF+?  I keep running into things in the Quick Start that are not germane to my HF+, running the latest firmware.

Also, can anyone point me toward an explanation of the dBFS scale used for signal strength with the Airspy HF+?  I've established that my Elecraft XG-3's S-9 signal equates to 20 dBFS on SDR#, and its -33 dBM (equivalent to 40 over 9) more than "pins the meter" on SDR#.  Is this normal?  

-- 

73, Pete N4ZR
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster.



--
Dave - WØLEV
Just Let Darwin Work

Re: Newbie material on HF+

David Eckhardt
 

If you have an S-9 signal which is -73 dBm and you have set dBFS to 0 dBm, the dBFS should read -73 dBm.  If you have set full scale to -20 dBm, the dBFS should read -53 dBFS.  Likewise, if you set the dBFS to -73 dBFS, the dBFS should read 0 dBFS. 

Dave - WØLEV

Virus-free. www.avast.com

On Thu, Apr 5, 2018 at 8:23 PM, Pete Smith <n4zr@...> wrote:

Please pardon the extreme newbie questions - I bought an Airspy HF+ recently, intending to use it on the IF of my K3 for spectrum display.  Of course, the K3 is off at Watsonville, so I've been experimenting, comparing the Airspy with a Red Pitaya and a QS1R.

From what I've seen I like SDR# a lot.  Is there anywhere an SDR# manual specifically for the HF+?  I keep running into things in the Quick Start that are not germane to my HF+, running the latest firmware.

Also, can anyone point me toward an explanation of the dBFS scale used for signal strength with the Airspy HF+?  I've established that my Elecraft XG-3's S-9 signal equates to 20 dBFS on SDR#, and its -33 dBM (equivalent to 40 over 9) more than "pins the meter" on SDR#.  Is this normal?  

-- 

73, Pete N4ZR
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster.




--
Dave - WØLEV
Just Let Darwin Work

Newbie material on HF+

Pete Smith
 

Please pardon the extreme newbie questions - I bought an Airspy HF+ recently, intending to use it on the IF of my K3 for spectrum display.  Of course, the K3 is off at Watsonville, so I've been experimenting, comparing the Airspy with a Red Pitaya and a QS1R.

From what I've seen I like SDR# a lot.  Is there anywhere an SDR# manual specifically for the HF+?  I keep running into things in the Quick Start that are not germane to my HF+, running the latest firmware.

Also, can anyone point me toward an explanation of the dBFS scale used for signal strength with the Airspy HF+?  I've established that my Elecraft XG-3's S-9 signal equates to 20 dBFS on SDR#, and its -33 dBM (equivalent to 40 over 9) more than "pins the meter" on SDR#.  Is this normal?  

-- 

73, Pete N4ZR
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster.

Re: New firmware update for the Airspy HF+ Rev 1.6.6 #airspyhfplus #firmware

Roberto Zinelli
 

The signal to noise ratio is better!,    my be you can use the attenuator at 6 or 12 db 

73 Robert

On Thu, Apr 5, 2018 at 9:46 PM, smswk via Groups.Io <smswk@...> wrote:
seems to be that there are some more DX`ers who noticed the same with the new Firmware.
I updated from 1.6.2 to 1.6.6 a couple of minutes ago.
With the same Settings the noise floor is about 10dB higher.

vy73`s de
Stefan


Re: New firmware update for the Airspy HF+ Rev 1.6.6 #airspyhfplus #firmware

smswk
 

seems to be that there are some more DX`ers who noticed the same with the new Firmware.
I updated from 1.6.2 to 1.6.6 a couple of minutes ago.
With the same Settings the noise floor is about 10dB higher.

vy73`s de
Stefan

Re: ADSBSpy Output format

jdow
 

They were probably time stamped when they were generated and queued for sending. In order to fix this you will have to go in and change the software on all the planes that show this effect. Your chances of success are very vary very small.

{^_^}

On 20180405 03:40, Support@... wrote:
Thanks for the help so far. I've been chasing a problem in my program, but I think it's being caused by spurious outputs from airspy_adsb. I seem to be getting duplicate frames such as.
*8D43C7DC5811E1E2A362FDBBBBBE;0504E0CF;0A;5D0C;
*8D43C7DC4810E1EAA362FDBBBBBE;0504E0D0;0A;5ECB;
*8D43C7DC4810E1EAA362FDBBBBFE;0504E0D1;0A;5833;
and
*5D407171B7757C;04B4AD19;0A;80BD;
*5D407171B7747C;04B4AD1A;0A;92A2;
*5D407171B77478;04B4AD1B;0A;9CF7;
*5D407171977458;04B4AD1C;0A;9E19;
I haven't decoded these frames, and some of them probably fail CRC/FEC checking, but, basically only one of these can be correct. The timestamps indicate the frames are separated by one 'tick' which is 50nS, but a short frame takes 64uS to transmit, and a long frame takes 120uS.  It appears that about 25% of the frames I'm receiving are mis-decodes, and some of them pass CRC/FEC checking.
I'm actually trying to do something with the SI/II decoded returns and these aren't covered by a reliable CRC/FEC. If I can't get reliable decodes from things that are CRC checked then I stand no chance with things that aren't.
Any ideas what can be done to improve things?

Re: #hardware #spyserver How do I find out what version of Airspy and Spyverter I have? #hardware #spyserver

Kent K5KNT
 

Thank you Martin. I have now verified I have a R2.

Re: Picking up FM 60MHz+ when only HF sma is connected. #airspyhfplus

David Eckhardt
 

Tune to the FM band and find the station you are hearing at 60 MHz.  How strong it is?  Likely it is a very strong station and may need a coaxial shunt notch "filter" to reduce its strength before it gets into the volume of the HF+. 

Dave - WØLEV 

Virus-free. www.avast.com

On Thu, Apr 5, 2018 at 2:29 PM, Eli Baum <elibnchina@...> wrote:
Hello, I have a weird problem.

When I disconnect the BHF port of the HF+, but connect a mini-whip to the HF port, I can still very audibly hear FM radio (54dBFS).

Obviously, this is somewhat perplexing. As I understood it, the VHF and HF circuits were isolated from each other, meaning I should not be able to hear FM radio with nothing connected to the FM port.

Please aid my lack of knowledge!

Much thanks,
EB




--
Dave - WØLEV
Just Let Darwin Work

Re: New firmware update for the Airspy HF+ Rev 1.6.6 #airspyhfplus #firmware

andrea ottaviani
 

firmware updated. It looks like another receiver!. good job
73 de IK0MMI Andrea

Re: Picking up FM 60MHz+ when only HF sma is connected. #airspyhfplus

Eli Baum
 

Thanks Stefan!

Will Do!

Re: Picking up FM 60MHz+ when only HF sma is connected. #airspyhfplus

smswk
 

HI EB,

sounds to me like your whip receives strong FM
signals and the Airspy HF+ VHF path picks it up.
Maybe already the trace on the PCB at the input stage.
If so, i would add a bandstop or LPF for the whip.

73`s de
Stefan


-----Ursprüngliche Mitteilung-----
Von: Eli Baum <elibnchina@...>
An: main <main@airspy.groups.io>
Verschickt: Do, 5. Apr 2018 16:29
Betreff: [airspy] Picking up FM 60MHz+ when only HF sma is connected. #airspyhfplus


Hello, I have a weird problem.

When I disconnect the BHF port of the HF+, but connect a mini-whip to the HF port, I can still very audibly hear FM radio (54dBFS).

Obviously, this is somewhat perplexing. As I understood it, the VHF and HF circuits were isolated from each other, meaning I should not be able to hear FM radio with nothing connected to the FM port.

Please aid my lack of knowledge!

Much thanks,
EB

Picking up FM 60MHz+ when only HF sma is connected. #airspyhfplus

Eli Baum
 
Edited

Hello, I have a weird problem.

When I disconnect the VHF port of the HF+, but connect a mini-whip to the HF port, I can still very audibly hear FM radio (54dBFS).

Obviously, this is somewhat perplexing. As I understood it, the VHF and HF circuits were isolated from each other, meaning I should not be able to hear FM radio with nothing connected to the FM port.

Please aid my lack of knowledge!

(I further see FM mirrors in the HF band)

Much thanks,
EB

Re: ADSBSpy Output format

Support@...
 

I tried strict mode, but that doesn't output the timestamps which I need. And CRC valid frames doesn't work well for the DF-11 SI/II frames which is my primary interest. 

What does the RSSI indicate? Is it some kind of Convolution/Correlation function value that can be used to assess the validity of the message?

Re: ADSBSpy Output format

prog
 

On Thu, Apr 5, 2018 at 03:40 am, <Support@...> wrote:
Any ideas what can be done to improve things?
If you only want CRC checked frames, use the strict mode. Other software like dump1090 need the CRC invalid ones to perform things like FEC and some other statistical tricks. Also, check the timestamps.

Re: ADSBSpy Output format

Support@...
 

Thanks for the help so far. I've been chasing a problem in my program, but I think it's being caused by spurious outputs from airspy_adsb. I seem to be getting duplicate frames such as.

*8D43C7DC5811E1E2A362FDBBBBBE;0504E0CF;0A;5D0C;
*8D43C7DC4810E1EAA362FDBBBBBE;0504E0D0;0A;5ECB;
*8D43C7DC4810E1EAA362FDBBBBFE;0504E0D1;0A;5833;

and 

*5D407171B7757C;04B4AD19;0A;80BD;
*5D407171B7747C;04B4AD1A;0A;92A2;
*5D407171B77478;04B4AD1B;0A;9CF7;
*5D407171977458;04B4AD1C;0A;9E19;

I haven't decoded these frames, and some of them probably fail CRC/FEC checking, but, basically only one of these can be correct. The timestamps indicate the frames are separated by one 'tick' which is 50nS, but a short frame takes 64uS to transmit, and a long frame takes 120uS.  It appears that about 25% of the frames I'm receiving are mis-decodes, and some of them pass CRC/FEC checking. 

I'm actually trying to do something with the SI/II decoded returns and these aren't covered by a reliable CRC/FEC. If I can't get reliable decodes from things that are CRC checked then I stand no chance with things that aren't.

Any ideas what can be done to improve things?
 

Re: Airspyhf+ flashing

Mark Taylor
 

Finally, after more than a dozen tries on 4 computers, my HF+ flashed. 

I'm pretty sure ultimately the thing that did it was the erase pins in the case had to be scraped clean to facilitate the original short.  It then flashed without any problems.

Great to be listening to it again.

On Wed, Apr 4, 2018 at 10:09 AM, Tom - N1MM <Tom@...> wrote:
fwiw, this is what  you should see when you flash the HF+. If you don't see the progress bars, your original erase did not work. 

Airspy HF+ Flash Utility
Looking for a suitable flashable device...
Looking for a suitable flashing driver...
This one can do the job: \WINDOWS\INF\OEM17.INF
Saving the calibration...
Rebooting the device in flash mode...
Flashable device found on port COM7
Unlock all regions
Erase flash
 
Done in 0.010 seconds
Write 42536 bytes to flash (167 pages)
[==============================] 100% (167/167 pages)
Done in 2.089 seconds
Verify 42536 bytes of flash
[==============================] 100% (167/167 pages)
Verify successful
Done in 1.457 seconds
Set boot flash true
Rebooting the device in normal mode...
Restoring the calibration...
Done
Press a key to close.


Re: #hardware #spyserver How do I find out what version of Airspy and Spyverter I have? #hardware #spyserver

Martin Smith
 

The only way I know is to open the box (unscrew the 4 screws on the USB side of the box) and look inside if you see a golden border around the PCB it is an R2.

You can find images of the Printed Circuit Boards at the below links:

Airspy NOS R0 - https://www.rtl-sdr.com/new-airspy-review-from-radio-user-magazine/
Airspy NOS R2 - https://www.rtl-sdr.com/review-airspy-mini/ or https://pbs.twimg.com/media/CQPZu8CWwAAkqDp.jpg
(This link is slightly confusing because it shows a R0 board https://www.rtl-sdr.com/airspy-revision-2-released/ as does the Airspy website https://airspy.com/airspy-r2/ )

quicktest - If you see a gold border it is a R2, otherwise it is a R0



Spyverter R1 - https://www.rtl-sdr.com/a-review-of-the-spyverter-r2/
Spyverter R2 - https://www.rtl-sdr.com/a-review-of-the-spyverter-r2/

quicktest - If you see a gold border it is a R2, otherwise it is a R1

Re: Now I've done it!

Bill Thompson
 

Alan,

I wish it were that easy. I have good continuity from both USB data lines all the way from the connector through a common mode choke to the microcontroller. Although I know what the microcontroller is, that's a 100 pin SMD that looks impossible to change and if I started with a blank part I probably couldn't re-flash it in its "new part" state.

I just have to spend the bucks and try to learn to be more careful. Shame though...Thanks for the thoughts.

--Bill

Re: Now I've done it!

Silverfox
 

You probably burned the traces from the USB to the dongle. It might be worth checking the connectivity. The USB data lines are not the same as the power lines.
73,
Alan - W6ARH

-----Original Message-----
From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of jdow
Sent: Tuesday, April 3, 2018 7:19 PM
To: main@airspy.groups.io
Subject: Re: [airspy] Now I've done it!

Have you tried it on another computer so you can verify IT is dead and not just the port on the laptop? Also give it the better part of a day powered off to see if the "fuses" on the USB ports heal themselves the way they are supposed to.
(I've had a USB port take several weeks to heal itself, too.)

{^_^}

On 20180403 18:10, Bill Thompson via Groups.Io wrote:
Hi all,

Before you all tell me how stupid I am, yes, I'm stupid!

I was working on my station making some measurements today and had a
bad slip-up. I managed to spark a 24V power source to a ground wire on
a USB audio device hooked to a USB port on the same Lenovo T410 laptop
that had my new Airspy HF+ hooked to it. Now the 2 computer USB ports
that were in use and the Airspy HF+ no longer work :-( The audio
device somehow survived. The laptop is old and expendable. I'm sad about the Airspy.

I already sucked it up and ordered a replacement Airspy HF+ but I
thought I'd see if I could work a miracle on the one I broke. Looking
inside it there appears to be a 6-pin SMT chip which is probably a USB
port protector. Possibly that's what failed and, if so, I have the resources to replace a part like that.
However. even with a microscope the marking on the part is not really legible.
It looks like it is marked "BTP" with a downward pointing arrow to the
left but I'm still not sure what it is.

Does anyone know what that part is? I'd like to check it for failure
and perhaps try replacing it. If I've damaged anything beyond that I
probably have a pretty new paper weight.

Thanks,

--Bill

Re: Now I've done it!

Bill Thompson
 

I did some more digging with the microscope. The protection chip appears to be just a clamp across the USB data lines. In the interest of troubleshooting I just removed it and carefully connected the Airspy to a working computer. It is still not recognized so I guess I've damaged the microcontroller itself in which case I'm totally beat. Too bad...I'll try to be more careful with the new radio...expensive misteak!

Thanks Joanne for the info and suggestions.
--Bill