Date   

Re: HF+ superb overload resilience

paul
 
Edited

I've just received the HF+ in my mailbox.

This SDR is clearly about sensitivity,sensitivity and sensitivity.

Performed a few tests with simple indoor passive loops with a 9:1 transformer.
Indoors next to my computer: A clear view on the Alpha nav signals at 11kHz.
Passive(!) loop size just 1m diameter.

Think about the days of analog film: did you use ASA 1200 film sensitivity on a bright sunny day?

Using a maximized & peaked full size antenna on 40m is not necessary at all.
Its band noise level will be way over the noisefloor of the receiver, shifting the usable dynamic range to the top area.

Just a modest size loop wil give excellent results due to the low noise floor of this RX.
Less efficient antennas are now possible, while using the full DR range of the HF+.

The next few weeks I'll be experimenting with this tiny SDR coupled to some relatively "tiny" passive wideband wire-loops.
The use of those smaller antennnas gives me more flexible antenna possibilities in placement,positioning and height.

I'm quite sure the net results will be equal or better than older SDRs with full size peaking resonant antennas.

73
Paul


Re: Airspy HF+ R3 Bypass

atouk
 

As with any user mod, your mileage may vary, use at your own risk, do not try this at home, voids warranty, if you don't think you know what you're doing don't do it, pre-tin all components before attaching, always wear eye protection.


(no animals were harmed while making this mod)


On 1/13/2018 10:33 AM, Paul Higginson wrote:

That certainly has the potential to lift tracks, If that's intended as a long term fix then perhaps put a drop of epoxy on the header to support it.

I think an hour or so simulating a filter / matching network with a bit of slope would be a better approach.

Paul GW8IZR


Re: HF+ superb overload resilience

prog
 

On Sat, Jan 13, 2018 at 07:36 am, Eckhard wrote:
There are also other voices, not only but aso this: https://www.youtube.com/watch?v=k6I-_LfspIs&feature=youtu.be
I'd like to ask what's wrong about Leif' test?
It seems to me, that the presence of one or two strong signals is not handled the same way as many not so strong signals, but still giving a significant summ of power to the HF+. So, having an automatic preselector (or even only high-pass filters) would be woth to think about.
What do you think?

Eckhard
If you inject strong enough signals, at some point you run out of attenuation range - which is in our case exactly 48 dB in 6 dB steps.
What the HF+ proposes is a better handling of bad signal situations than what most of us are used to, at a very reasonable price for the performance.

Only novices don't know that ANY radio can be put on its knees with a carefully crafted test setup.


Re: Airspy HF+ R3 Bypass

Paul Higginson
 

That certainly has the potential to lift tracks, If that's intended as a long term fix then perhaps put a drop of epoxy on the header to support it.

I think an hour or so simulating a filter / matching network with a bit of slope would be a better approach.

Paul GW8IZR


Re: HF+ superb overload resilience

Eckhard
 

There are also other voices, not only but aso this: https://www.youtube.com/watch?v=k6I-_LfspIs&feature=youtu.be
I'd like to ask what's wrong about Leif' test?
It seems to me, that the presence of one or two strong signals is not handled the same way as many not so strong signals, but still giving a significant summ of power to the HF+. So, having an automatic preselector (or even only high-pass filters) would be woth to think about.
What do you think?

Eckhard


Re: HF+ superb overload resilience

prog
 

On Sat, Jan 13, 2018 at 07:06 am, EB4APL wrote:
Congratulations Youssef, well done job, and also congratulations to the happy owners.

73 de Ignacio, EB4APL
Thanks Ignacio. Enjoy your new receiver!


HF+ superb overload resilience

EB4APL
 

Hi,

I just received my HF+ that I have preordered on 11/12/2017, received the email confirming the shipment on 12/22/2017 and it arrived 01/12/2018 via registered mail.

I selected registered mail because a bad experience when I purchased my AirSpy R1 to be send via DHL and upon arrival I realized that DHL has also a Customs clearance business. In my case their fees to pass the goods through the Customs was higher that the transportation expenses, so they try to get them taxed to increase their income. In the other side, local Post usually dispatch the small packets without paying duties, so I selected shipment by mail this time.

About the AirSpy good performance in high level RF environment, these are my preliminary tests.

I live in a place where there are located most broadcast transmitters of the area. I have a transmitter site with a 600 KW monster, a 100 KW  and a 50 KW MW transmitters at a distance of 6.8 Km., another with 2 x 50 KW ones at only 1.6 Km, another 50 KW TX at 3.1 Km and a lot of FM 1 - 10 KW broadcasters even closer, you can imagine.

I use a 20 m long dipole antenna, cut for the 40 m Ham band, that I use for reception on the whole HF, usually with a HP filter inserted to avoid MW overload in my SDR receivers.

I tested the HF+ directly from the antenna without the filter, the powerful MW signals appeared above 0 dBFS so they should cause A/D saturation, but I don't see any saturation symptom in the spectrum. Then I  inserted a variable attenuator between the antenna and the HF+ and found that I have to use 29 dB to keep the peaks just below 0 dBFS. Anyway it looks that I don't need the attenuator since there are not signs of overload without it. Replacing the antenna with a calibrated signal generator, I have to insert -9 dBm before the attenuator to obtain the same spectrum level. So without the attenuator my antenna is giving + 20 dBm, unless I am doing something wrong. Quite a large signal !!!

I'll repeat the measurements after bridging the capacitor for VLF reception, and also in  VHF to see how the FM BC affects this, but I think that you will want to know this good receiver behavior in this extreme environment.

Congratulations Youssef, well done job, and also congratulations to the happy owners.

73 de Ignacio, EB4APL


Re: HF+ with Yaesu FT-950: Hardware and software configuration #airspyhfplus #shortwave #hardware #sdrsharp

Siegfried Jackstien
 

i do not know much about sdrsharp configuration

here i use a similar setup but software used is hdsdr, sdr hardware also is different ... but the overall setup should be quite similar :-)

you can select if the sdr is connected directly to antenna ... or on the if chain of the radio

you can sync both in both cases (depending what you set in the setup)

rig is then connected to pc via cat (synced also to clustersoft and logbook via omnirig driver)

sdr is synced via extio driver (there is a brand new one for the hf+ with ppm correction etc. ... see other posts)

in hdsdr you can set another offset depending on mode (dont know if sdrsharp also has this function)

in my case i have to add 700hz for cw mode that the sweet spot of software and rig do match (my rig shifts the first if 700hz when using cw ... so you have to find out what your rig does)

you have to tell is some deeper details to help you with your setup

....

i am guessing right that you wanna connect the hf+to the if out ???

a much cheaper sdr could be used for that cause you have higher signal levels already on that spot (amplified from the rigs frontendand already filtered) ... and you also have a somewhat fixed level in that area (controlled by agc chain in the rig) ....no need for such high bit numbers and dynamic range that a good sdr has

i would use an rtl dongle for that and use the hf+ as a second receiver (on a low noise external antenna like a beverage or k9ay loop) .... but that are my personal feelings about using such a good sdr as backend on the if chain

good luck with your setup

dg9bfc sigi

ps my other rig has iq in and out on a usb cable plus cat on the same cable ... connect to pc and run hdsdr and you are done ... no sdr hardware needed cause the rig IS an sdr and just routes the raw iq data towards usb ...


Am 13.01.2018 um 11:40 schrieb Tom via Groups.Io:

Hi folks!
Received my AirSpy HF+ today, hooked it up but quickly ran into one or the other config question which I could not solve by just searching the web.
My plan was to run the AirSpy HF+ using the following configuration: Yaesu FT-950 equipped with RFSpace IF-2000, AirSpy HF+, SDRsharp-SW on Windows 10-PC.
Is there any source of sample configurations covering this setup?
Any hint is highly appreciated!
vy73/55 from Hamburg/Germany, Tom


HF+ with Yaesu FT-950: Hardware and software configuration #airspyhfplus #shortwave #hardware #sdrsharp

Tom
 

Hi folks!
Received my AirSpy HF+ today, hooked it up but quickly ran into one or the other config question which I could not solve by just searching the web.
My plan was to run the AirSpy HF+ using the following configuration: Yaesu FT-950 equipped with RFSpace IF-2000, AirSpy HF+, SDRsharp-SW on Windows 10-PC.
Is there any source of sample configurations covering this setup?
Any hint is highly appreciated!
vy73/55 from Hamburg/Germany, Tom


Re: I'd like to talk to a developer who has experience creating SDR# plugins

Tom - N1MM
 

Yes. I will add that. Not sure it will be in first release on Tuesday. It's just UI work.


Re: Airspy HF+ R3 Bypass

paul
 
Edited

There's a reason why the ARM chip and its oscillator are well separated from the RF entries, and the RF traces are carefully surrounded by shielding and PCB ground.

You are now leading the sensitive RF entry, via unshielded leads and cap, very close the the ARM chip, risking to pick up its processing noise.

Better try to keep the proposed bypass as close to R3 as possible.

73
Paul


Re: I'd like to talk to a developer who has experience creating SDR# plugins

Paul Higginson
 

OK Tom I can test scenario 1 and 3 , you are correct its 3 that I'm interested in primarily. So I currently add offsets in the bandmap for 70MHz, 144MHz 432MHz and 1296MHz. By entering 144300 in the entry window qsy's the HF TRX to 28300 (and) applies the offset in the bandmap displaying 144300 and showing spots for 2m band. Entering just 325 the radio QSY's in band as expected.

I'll do the testing with HF+ and report what happens but I suspect the HF+ may be tuned to 144300 rather than the desired 28300  for TVRT support.

Let me test here and report back.

Paul GW8IZR

On 12/01/2018 23:54, Tom wrote:
Yes Paul to you. 

You are asking about a case that I have not coded for (or even thought of). There are apparently 4 use cases. 
1. HF+ & primary radio share the antenna and listen to the same frequency. This is the case I coded for. 
2. HF+ listens to IF out of a radio.  I need to shift the spectrum & waterfall as the radio tunes. This is the smearing case I did not code for. 
3. VHF to HF transverter.  HF+ and radio listen to the same frequency but the spectrum display needs to show the freq+offset.  I have not coded for this either. It's not terribly hard, I just haven't done it. 
4. VHF to HF transverter. HF+ listens to radio's IF frequency. This is a combination of 2 & 3. 

I presume you are setting your transverter offsets in the bandmap. Since you will be testing case 3, I expect the frequencies on the bandmap will be correct, but the spectrum window will probably attempt to listen to the VHF frequency.  This is because I have not coded for that. 

I'll sleep on this problem tonight and look at it tomorrow.  If you could do an initial test and confirm the above, that should be plenty of testing on this version. If you will be around tomorrow morning USA time, we could make quick progress with use case 3. 

73,
Tom - N1MM


Re: I'd like to talk to a developer who has experience creating SDR# plugins

jeje FKJ
 

hello
Thank's tom, great news.
Any possibility to select manually HF+ IP:port ?
case HF+ on another computer , multi acces to spyserver : run + inband etc...

73,
jeje - F8FKJ


2018-01-13 0:54 GMT+01:00 Tom <Tom@n1mm.com>:

Yes Paul to you.

You are asking about a case that I have not coded for (or even thought of).
There are apparently 4 use cases.
1. HF+ & primary radio share the antenna and listen to the same frequency.
This is the case I coded for.
2. HF+ listens to IF out of a radio. I need to shift the spectrum &
waterfall as the radio tunes. This is the smearing case I did not code for.
3. VHF to HF transverter. HF+ and radio listen to the same frequency but
the spectrum display needs to show the freq+offset. I have not coded for
this either. It's not terribly hard, I just haven't done it.
4. VHF to HF transverter. HF+ listens to radio's IF frequency. This is a
combination of 2 & 3.

I presume you are setting your transverter offsets in the bandmap. Since you
will be testing case 3, I expect the frequencies on the bandmap will be
correct, but the spectrum window will probably attempt to listen to the VHF
frequency. This is because I have not coded for that.

I'll sleep on this problem tonight and look at it tomorrow. If you could do
an initial test and confirm the above, that should be plenty of testing on
this version. If you will be around tomorrow morning USA time, we could make
quick progress with use case 3.

73,
Tom - N1MM


AirSpyHF+ ExtIO: new release #airspyhfplus

Andrea IW0HDV
 

A new release of IW0HDV ExtIO dll is available here:

https://github.com/IW0HDV/extio-iw0hdv/releases/download/v1.0.5-5-0e5030c/extio_airspyhf_cmake_mgw-v1.0.5-7-g8ddcbe2.dll


It encompasses the airspyhf library up to airspy/airspyhf@c90a817

The lib release string is now visible on the title bar together with the S/N.

Calibration and GPIO support have been added.

Multiple device scan and calibration flash yet to be implemented.


Re: Airspy HF+ R3 Bypass

Alan G4ZFQ
 

You can change the capacitor size in seconds, making finding a value you're satisfied with easy, and tweaking it if you change antennas easier on yourself and the circuit board.
Providing the mechanical stress does not rip the track off the board?
There is a lot of leverage at the end of your added capacitor.

73 Alan G4ZFQ


Another nice HF+ review #review #wspr #airspyhfplus

prog
 


Re: SoapySDR plugin for Airspy HF+

prog
 

On Fri, Jan 12, 2018 at 05:01 pm, Corey wrote:
Hi all,

I just got my Airspy HF+ and wanted to use it with programs that
support the SoapySDR framework. I've made a basic SoapySDR plugin
module for the Airspy HF+. It's based on the SoapySDR plugin for the
original Airspy. You'll need the libairspyhf driver and (obviously)
SoapySDR. I've only done very basic testing, on linux, with CubicSDR,
at HF frequencies/HF connector only. The source is on github. I don't
have any binaries for release.

https://github.com/stottsc/SoapyAirspyHF

-Corey
You're the man. Thanks Corey!


Re: Airspy HF+ Spur on 98.304MHz #airspyhfplus

jdow
 

On 2018-01-12 06:55, Roberto Zinelli wrote:
Lan Dxer, welcome to the world of sdr.
A long time ago, when I started with sdr, I came across your own problems.
The main difference from a traditional radio and a SDR is the antenna ground path.
In the physical radio the frame (and also the antenna socket) is grounded through the power plug.
https://img.memecdn.com/facepalm-level-the-mummy_fb_250592.jpg
{facepalm}

{+_+}


SoapySDR plugin for Airspy HF+

Corey
 

Hi all,

I just got my Airspy HF+ and wanted to use it with programs that
support the SoapySDR framework. I've made a basic SoapySDR plugin
module for the Airspy HF+. It's based on the SoapySDR plugin for the
original Airspy. You'll need the libairspyhf driver and (obviously)
SoapySDR. I've only done very basic testing, on linux, with CubicSDR,
at HF frequencies/HF connector only. The source is on github. I don't
have any binaries for release.

https://github.com/stottsc/SoapyAirspyHF

-Corey


Airspy HF+ R3 Bypass

atouk
 

Here's a slightly different take on the R3 bypass.  Since not all antennas are created equal, and what's good for one may not be quite right for another.  This also address some of the other issues with the simple jumper method.  DC bias, changes that might happen in future updates that could necessitate removal of the jumper.  Constantly hitting a SMT part with an iron. and giving static from the antenna a direct path into the tuner.

Solder a 2 pin SIP header onto the Capacitor at position R3.


This gives you a quick undo/redo.  You can use a straight dip jumper if you prefer, or use a DuPont connector with a capacitor.  You can change the capacitor size in seconds, making finding a value you're satisfied with easy, and tweaking it if you change antennas easier on yourself and the circuit board.

15201 - 15220 of 42053