Date   

Re: Getting started again after a year or more, need a little help

prog
 

On Mon, Oct 21, 2019 at 10:37 AM, Ray, W4BYG wrote:
In the menu setup, the source is defaulted to "Airspy".  The device serial number says "none".  (I don't recognize a SN on the box to insert manually).  Should the unit register it self or is it one of the long skew numbers on the side of the box?
For HF+ you should select "Airspy HF+ Dual / Discovery" in the source selector:


Re: Transmission lines, Input match and Connectors #bestpractice #experiment

doug
 

On 10/19/2019 10:20 PM, jdow wrote:
Um, tell that to HP.

BNC barrel attenuators are good probably to 20 dB. I have lower
attenuation units - 3 dB and 6 dB sort of things. (At HF I like to use
them because they provide a nice leakage path to deal with static build
up issues.)

{o.o}

On 20191019 13:02:42, doug wrote:

/snip/

I do have
some BNC coaxial attenuators I can use. I have to dig them out. It's an
archeological expedition time.

{^_^}
Hi, Joanne--
Surely you of all people know that BNC attenuators are not very good
attenuators at any VHF or higher frequency. Fine for HF, unless you need
a lot of attenuation.

--doug, WA2SAY
Well, you do agree that BNC attenuators are only really useful at HF. Good. I am concerned about a blanket recommendation of BNC attenuators
among those who are not experienced in the RF field. I would endorse TNC
types, at least to 1 GHz, altho they are not in common use, and certainly Type N, all the way to X-Band, at least. If anyone reading this is considering buying attenuators for RF and microwave frequencies,
please go to Google and check the manufacturer's specifications first!
Do check e-bay--sometimes you get lucky! (When you get the device, test
it with an ohmmeter! It could have been blown out by exposure to high power. If so, send it back!)

(Thank goodness, there are [to my knowledge] no UHF attenuators. I have been campaigning [without success] against all use of UHF connectors for any RF use for years! All my radios and antennas are
connected thru adapters to type N or BNC. At least BNC's are 50 Ohms,
even if they do leak RF. And they don't take a 200 Watt soldering
iron to assemble to coax!)

--doug, WA2say


Getting started again after a year or more, need a little help

Ray, W4BYG
 

I have an HF+ purchased over a year ago.  Wasn't very successful using it then, the gain seemed low, so I set it aside.  I've recently downloaded and installed the new SDR# v1.0.01731.  I connected the HF+ to my desktop via USB and a multiband vertical.

Device Manager recognizes the HF+ and the the LED on the HF+ is on so it is connected to the computer and receiving power and capable of receiving signals.

In the menu setup, the source is defaulted to "Airspy".  The device serial number says "none".  (I don't recognize a SN on the box to insert manually).  Should the unit register it self or is it one of the long skew numbers on the side of the box?

The gain is set to a mid position.  Full gain doesn't help.  I don't remember or know how, to go any further.

Consequently, I'm getting no indication of any signals received on any frequency.

What am I missing?  Your help would be appreciated.
Ray, W4BYG

  

Virus-free. www.avg.com


Re: Transmission lines, Input match and Connectors #bestpractice #experiment

kb3cs
 

the Windsor Star article reminds me of this story:
  https://hackaday.com/2019/05/15/the-great-ohio-key-fob-mystery-or-honey-i-jammed-the-neighborhood/

  - 1g (base 57) -


On Fri, Oct 18, 2019 at 10:52 AM, prog wrote:
[...] What could happen, however, is all these non-linearity problems that could be introduced by bad contacts (mostly in connectors), bad cables, and even rusty metallic structures surrounding the antenna that could mix signals and translate them into unexpected frequencies. Here's an example from the recent memory: https://www.pressreader.com/canada/windsor-star/20191009/281517932872802
I have seen this happen too many times to ignore it. Many experienced ops overlook these details.


Re: Airspy R2 SDR architecture

Sergio Sarabia
 


Re: Airspy R2 SDR architecture

Sergio Sarabia
 


Re: Airspy R2 SDR architecture

Bob
 

Thank you all for your replies, but this thread seems to have wandered off topic a little.
I was looking for information as to the gain, attenuator and detector adjustment capabilities within an Airspy R2. 


Re: Airspy R2 SDR architecture

prog
 

Highly recommended for ADSB receivers near base stations:

http://shop.sysmocom.de/products/cf1090-kt30


Re: Airspy R2 SDR architecture

Ian Brooks
 

Another explanation could be that if you are in a poor coverage area, mobile phones nearby will be transmitting at maximum power. Is the interference on the base station transmit frequency or the mobile transmit frequency?

Ian Brooks, former Vodafone Base Station maintenance Engineer.


Re: Community Installer

Rodrigo Pérez
 

Hi,

Some antivirus detect installers created with NSIS as virus. The installer download sdr# files and plugins at install time so, the files are the same. 
Now I change some parameters in the creation of the installer and upload the new version. Tested with virustotal.com and only one antivirus detect as virus https://www.virustotal.com/gui/file/941a5358f1a0400c97c480e1b09063812b111238369308fa6d06b7d1de3d9458/detection

Can you re download and try again?

Regards

El 20 de oct. de 2019 5:08 -0300, Dennis Fitch via Groups.Io <dennis.fitch@...>, escribió:
Hi, I'm not using any plugins, as I can't actually get the program to run at all, I've received several virus warnings, both from Kaspersky and Windows Defender, but even after disabling Kaspersky still won't load, all I see is an Airspy logo overlaid on my desktop for about 30 seconds, before it disappears.

Dennis G8IMN


Re: Airspy R2 SDR architecture

EB4APL
 

A likely explanation is that you don't have coverage from your provider, but other provider could have strong signals there. Also the interference could be caused from another nearby source.

Regards,
Ignacio


El 20/10/2019 a las 14:53, James Farrar escribió:
Thank you for your reply.
I'm using a cavity filter made by a friend of mine, followed by an LNA powered by a bias-T in a housing at the top of an aluminium pole.
I did have a lot of interference from mobile telephone masts even though there is no coverage here. This was eliminated with the cavity filter.
_._,_._,_



Libre de virus. www.avast.com


Re: Airspy R2 SDR architecture

Bob
 

Thank you for your reply.
I'm using a cavity filter made by a friend of mine, followed by an LNA powered by a bias-T in a housing at the top of an aluminium pole.
I did have a lot of interference from mobile telephone masts even though there is no coverage here. This was eliminated with the cavity filter.


Re: New SDR# release r1717 with Telerik UI #software #announcements

prog
 

Maybe start with the trial and see what happens. No need to re-deploy the same assemblies.


Re: New SDR# release r1730 with High DPI support #software #announcements

Tudor Vedeanu
 

What does "High DPI support" mean in this case? On my Surface Pro 4 the app looks exactly the same like the older versions, i.e. the UI text and the controls are still pixelated (not sharp and crisp like Windows Explorer, Office etc.).

~Tudor


Re: Community Installer

Dennis Fitch
 

Incidentally, SDR# 1730 runs without problems, it's only the community installation I'm having issues with.

Dennis G8IMN


Re: Community Installer

Dennis Fitch
 

Hi, just checked, 4.8 was installed on 11-10-19


Re: Airspy R2 SDR architecture

Sergio Sarabia
 

If you are looking to reduce the noise by 1090 MHz, I recommend using a bandpass filter at that frequency or a rejection filter from the GSM mobile phone band.


Re: Community Installer

Edward MacDonald
 

Make sure you have the .NET 4.8 Runtine installed on your computer. The latest version of SDR# would not run without it on my comp (Win 10 64 bit)


On Sun, Oct 20, 2019, 2:08 AM Dennis Fitch via Groups.Io, <dennis.fitch=blueyonder.co.uk@groups.io> wrote:
Hi, I'm not using any plugins, as I can't actually get the program to run at all, I've received several virus warnings, both from Kaspersky and Windows Defender, but even after disabling Kaspersky still won't load, all I see is an Airspy logo overlaid on my desktop for about 30 seconds, before it disappears.

Dennis  G8IMN




Airspy R2 SDR architecture

Bob
 

I'm using this excellent SDR for ADS-B and would like to find a system drawing of the gain stages in order to understand  how best to approach some fine tweaking of the system.
I did see something once, that if I recall correctly, had the input attenuation before the first gain stage. If this is so am inclined to set the first stage to maximum gain to reduce the noise floor.
Am I correct in my thinking?


Re: Community Installer

Dennis Fitch
 

Hi, I'm not using any plugins, as I can't actually get the program to run at all, I've received several virus warnings, both from Kaspersky and Windows Defender, but even after disabling Kaspersky still won't load, all I see is an Airspy logo overlaid on my desktop for about 30 seconds, before it disappears.

Dennis G8IMN