Date   

Re: Airspy HF+

prog
 

As you may have noticed, we also changed the USB connector in the Airspy R0 for a much better custom through-holes model that is currently used in the Airspy R2 and the SpyVerter.
We have had good experience with this one, so we will reuse it. Don't change a winning team.

You can check the pictures here:

https://groups.io/g/airspy/message/23229


COMINT Consulting's Krypto500 v.1260 now supports Airspy R2 + SpyVerter #hardware #airspy

prog
 

Hi,

I'm pleased to forward some good news from COMINT Consulting. Now Krypto500 v.1260 supports the Airspy R2 + SpyVerter "combo" natively.
Krypto500 is a high performance software suite dedicated to narrow band signal analysis, classification and decoding.

Have a look on the official announcement here: http://www.comintconsulting.com/blog/new-krypto500-version-released-ten-10-new-decoders/

Support for the upcoming Airspy HF+ will be added and announced when ready. If things go well, the SpyServer can also be of the party.

Thanks!

The Airspy Team




Re: Airspy HF+

Trango <rfnoise@...>
 

How is the stain relief on that USB connector? The only issue I've had with AirSpys (past and present) are failures of the USB connector. In most cases it's repairable the first time, but after that, not so much.


Re: Airspy HF+

prog
 

This time, we have more space and the entire RF section reside inside a metal can.
The result is that when you disconnect the antenna, the noise floor drops to just 5 dB above the quantization noise.
The 0 ohms resistors can be used to separate the HF path entirely, or multiplex it with the VHF input.



The communication with the external world is done via LVDS, and was carefully matched for proper EMI management.


Re: SDRsharp on a 64bit version of Windows 10

Rob Dawson
 

Win 10 x64 here,
Installed drivers as normal with Zadig, launched SDR# 1583
All worked as expected.
Have you tried running as admin?


Re: COMINT Consulting's Krypto1000 now supports Airspy R2 #airspy #hardware

prog
 

You should contact their sales representatives.

https://comintconsulting.com/contact/


Re: SpyServer Multiple RTL-SDR Devices #RTL #sdrsharp

prog
 

I don't know either. Wait until you have a device that has an actual serial number.


SpyServer Multiple RTL-SDR Devices #RTL #sdrsharp

Mike Jackson <mde.jackson@...>
 

spyserver.config requests the 64-bit hex number where there's more than one device.

I'm testing spyserver ahead of ordering my AirspyHF+.  I have an RTL-SDR based dongle used for ADS-B and have a second v3 RTL-SDR I want to stream using spyserver, both hosted on an RPi3.

Running lsusb on the RPi3 shows these two relevant entries:

Bus 001 Device 005: ID 0bda:2832 Realtek Semiconductor Corp. RTL2832U DVB-T
Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T

How do I get a 64-bit hex ID from either (I actually don't know which is which!)

Thanks,
Michael


Re: COMINT Consulting's Krypto1000 now supports Airspy R2 #airspy #hardware

John Flanagan
 

Any idea of the software cost and is it open to anyone to purchase ?

Thanks,
FLANO


Re: Airspy HF+

jdow
 

Weeeeellllll, AirSoy 1 benefited a lot from some basic EMI treatment. AirSpy 2 benefited but not as much as 1. What I did is take a suitable tool and GENTLY flake off a narrow band around the edges of the inside of the front and back panels. I also flaked off the paint from the thin edges of the box proper. That way I got metal to metal contact all around the box. (Yeah, it's aluminum; but, it did make difference.) Then I gently flaked paint a little less than the gold lockwasher's diameter around each SMA connector hole on the outside face. And I flaked away some paint on the inside around the USB connector. I arranged for some braid to get pinched by the USB connector and reassembled the box. On R1 I got a good 30 dB improvement. On R2 it seemed to be somewhat less.

Once that is done audiofeelie grade USB cables are nonsense. But good size (3/8" hole) ferrite sleeves can make an additional difference if applied both to the antenna feed and the USB cable. You can get decent help at UHF and higher frequencies with the the smaller 1/4" diameter ferrite sleeves. For AirSpy plus Spyverter I'd use the bigger ferrites. For UHF and up the littler sleeves may do better. Some of the trick is picking the ferrite material to use. If Ambidon is still in business.... They are so visit "www.amidoncorp.com/" . In the past they've been quite helpful. And they are (were) ham radio friendly.

{^_^} Joanne

On 2017-08-06 13:48, prog wrote:
Everything is shielded. There's only one way to get your external noise inside the RF section (under the metallic can), and its' the RF input.
In the other hand, there are less performance constraints on the USB link since we are only streaming 24.5 Mbps. Of course, you will always find more expensive snake oil audiophile grade usb cables in the Internet. I'd say put that money on a good antenna and better cables :-)


Re: Ideas for cheap and effective loop antennas

Leif Asbrink
 

I made a 30 cm diameter, two turn loop using RG8.

A 6.8 nF capacitor tunes it to 1.1 MHz. With one turn
on the primary and 18 turns on the secondary I see 50
ohms on 1.1 MHz.

The signal level is about 10 dB below what I see from
a 10 meter wire antenna - and that is enough with a margin
for a receiver with a low NF.

Suppression of conducted interference is poor however.
That is easy to fix - I will try to get the time to make
a video showing the nature of the problem and how to fix it.

The 30 cm loop when tuned to 1.1 MHz has a useful bandwidth
of about 500 kHz (with a low noise receiver.) Adding a very
simple amplifier would make the bandwidth MUCH larger.

73

Leif

A very good and cheap receiving loop antenna can be made from one turn
coaxial cable with diameter of about 1,5 meter and gap in the shield in
the middle of the antenna (at the top of the loop)
Why not rearrange the same one turn to achieve two turns with good shielding and balancing?
For the amplifier, I'm trying to keep things simple. I'll probably just rely on the low NF of the HF+ to exploit the small loop.


Re: Airspy HF+

Mike Bott <mike_bott@...>
 

Covered with my Pixel RF Pro-1B.

--
Mike


Re: Airspy HF+

prog
 

Everything is shielded. There's only one way to get your external noise inside the RF section (under the metallic can), and its' the RF input.
In the other hand, there are less performance constraints on the USB link since we are only streaming 24.5 Mbps. Of course, you will always find more expensive snake oil audiophile grade usb cables in the Internet. I'd say put that money on a good antenna and better cables :-)


Airspy HF+

Mike Bott <mike_bott@...>
 

I have been following this with anticipation. The question that comes up in my mind is will this ship with a quality, shielded micro-USB cable or should a start looking for one on my own?

Very much looking forward to the opportunity to place an order.

--
Mike


Re: SDR# questions (shortcuts and frequencies.xml) #sdrsharp

prog
 

Keyboard shortcuts could be added easily using a dedicated plugin if someone is motivated enough to cover all the controls - and there are dozens. The challenge here is to avoid messing with the different settings from third party plugins that may use the same shortcuts.

For the frequency xml database, you can use mklink as administrator to create links to the same target. Note that by doing so, if you manipulate the file in instance 1 of SDR#, other instances are not aware of the changes and may just overwrite the file causing data loss. If you just need one master file for all instances in read only mode, this should work.


Re: Ideas for cheap and effective loop antennas

prog
 

Maybe binocular ferrites can be a good compromise for the size, performance and reproducibility.


Re: Ideas for cheap and effective loop antennas

Alberto I2PHD
 

On 8/6/2017 5:50 PM, Leif Asbrink wrote:

The transformer can have a single turn on the primary. In
that case, make a short tube that fills most of the inner
diameter of the toroid. Distribute the secondary winding
evenly over the toroid. That would minimize the leak
inductance.

You can even use the loop itself as primary, like in this photo...
In this case the transformer had only two turns as secondary, may be more would have resulted
in a greater efficiency...


 

--
73 Alberto I2PHD
Credo Ut Intelligam



Re: Ideas for cheap and effective loop antennas

Leif Asbrink
 

Yes, with a transformer that lifts the very low impedance
to about 50 ohms one can get a fairly good sensitivity.

The transformer can have a single turn on the primary. In
that case, make a short tube that fills most of the inner
diameter of the toroid. Distribute the secondary winding
evenly over the toroid. That would minimize the leak
inductance.

Go to the frequency of interest. Listen to a stable signal,
then see how much it changes when you add a 50 ohm load
in parallel to the receiver input (assuming the rx is 50 ohms)

If the signal drops by much more than 6 dB you need fewer turns
on the secondary, if the signal drops by much less than 6 dB,
you need more turns on the secondary.

In case you want more sensitivity you can tune the loop
with a capacitor in series with the primary winding.

If you have an impedance bridge, look at the impedance
seen by the receiver. It should be resistive at the frequency
where the capacitor resonates with the loop. Make it 50 ohms
by changing the turns ratio.

If you put flanges on the single turn to have just a very
narrow air gap for the secondary on three sides you can
reduce the leak inductance further which is good for
the bandwidth and makes the choice of ferrite material
even less critical.

A test: Check that the impedance on the secondary is
much higher than 50 ohms when the loop is disconnected.
(Measure or compute the inductance.)

73

Leif

The idea is to avoid any complex electronics and extra power supply.


SDR# questions (shortcuts and frequencies.xml) #sdrsharp

capitano nemo <capitanonemo68@...>
 

Hi all.
1. is there a way to change mode (e.g. from USB to LSB) without going in the "Radio" collapsible section on the SDR# left pane?
I mean, some  shortcut keystroke...
2. is there a way to change the location of frequencies.xml ? I would like to put it in a folder visible from many instance of sdr#.
After googling a lot I could'nt find those answers... Thanks in advance.
Bye
Gio

p.s. if there is no simple way to do these... can sdr# team add these in the wishlist ?


Re: Ideas for cheap and effective loop antennas

jdow
 

On a quick glance I can see this person got it right. One other example I saw fed into the gates of J-Fets or something like that - high impedance. Going into common base amplifiers is good. And he's running them at high current, which makes the input impedance even lower.

{^_^}

On 2017-08-06 02:35, Mendo Mendevski via Groups.Io wrote:
The impedance of the small loop antenna is very low, so the RF-transformer should be with few turns on the primary side, and 5 to 10 times more turns on the secondary side (depend of number of turns and diameter of the loop), to achieve 25 to 100 times transformer ratio for 50 ohm receiver input.
The diameter of the loop should be at list 1,5 meter, if one want to using it without amlifier...
I have made many experimental small magnetic loops (shielded or not shielded).
A very good and cheap receiving loop antenna can be made from one turn coaxial cable with diameter of about 1,5 meter and gap in the shield in the middle of the antenna (at the top of the loop)
The better is if one can have a good electronic soldering skills to make itself an antenna amplifier.
A good starting point is Chavdar`s (LZ1AQ) web-page for this: http://www.lz1aq.signacor.com/docs/wsml/wideband-active-sm-loop-antenna.htm
Regards,
Mile Kokotov, Z33T
On Sunday, August 6, 2017 1:02 AM, prog <info@...> wrote:
The idea is to avoid any complex electronics and extra power supply.