Re: Problem flashing to 20180216

Stephen QRP

Hi

Considering flashing to latest firmware, question please can I use 20180216 or should I first use 20180207 then 20180215 and finally 20180216.
I assume I can jump straight to 20180216, but thought I would ask first.

Regards

Stephen

Re: AirspyHF+ VHF performance in RF-dense environment

Chris Spacone

Yes indeed that Mt. Wilson.

On Feb 18, 2018, at 12:26, Andrea IW0HDV <andrea.montefusco@...> wrote:

Off topic:

Is it _that_ Mount Wilson ?

(the one with Observatories  on top)

Andrea Montefusco IW0HDV

On Feb 18, 2018 19:14, "Chris Spacone" <cspacone@...> wrote:
I should go to Mount Wilson and try that!

NF and MDS calculation of the airspy HF+

tim.hallegraeff@...

Hello community of airspy!

I am trying to calculate the MDS of the airspy HF+ at larger bandwidths in comparison with the spec sheet. In the spec sheet the sensitivity's are at a bandwidth of 500 Hz. The sensitivity of the airspy HF+ should be higher than the Airspy Mini and Airspy R2 according to the site. I am going to use the airspy in the 136-173,4 MHz region, however, i will never be measuring in this complete bandwidth. These are my calculations:
Airspy HF+ MDS @ 136-173,5 --> 140,5 at 500 Hz bandwith. This means that the NF must be:

NF = MDS - 10log(kT*1000) - 10log(Bandwidth).
This gives me a NF of 6,5. If i would measure on lets say 1,575 MHz bandwidth this would give me -105.54 dBm MDS according to:
MDS = 10log(kT*1000) + NF + 10log(Bandwidth)

The airspy mini and R2 have an NF of 3.5 at 42-1002 MHz. This would provide a MDS(sensitivity) at 1,575MHz of =-108dBm.

This tells me that the R2 and Mini can detect weaker signals and hence have a higher sensitivity. What am i doing wrong here?

I will choose one of the three air spy's depending on this value. Can someone also tell me the exact difference between Mini and R2, i cant find any significant ones.

Im fairly new to this discipline, so if im wrong apologies in advance.

Greetings,

Tim

Re: #airspyhfplus

prog

On Mon, Feb 19, 2018 at 06:47 am, Gymnae wrote:
Will some of the new features for tweaking and adjustment also be available to Spy server users?
There is only one way to get that quickly: HUMAN CLONING!

Re: #airspyhfplus

Gymnae

Will some of the new features for tweaking and adjustment also be available to Spy server users?

1st attempt on MW with my HF+

Patrick

Despite average conditions, Nigeria was a nice signal last night on 917 kHz ; see the short clip HERE

Re: AirspyHF+ VHF performance in RF-dense environment

jdow

Si. It is.
{^_^}

On 20180218 12:26, Andrea IW0HDV wrote:
Off topic:
Is it _that_ Mount Wilson ?
(the one with Observatories  on top)
Andrea Montefusco IW0HDV
On Feb 18, 2018 19:14, "Chris Spacone" <cspacone@socal.rr.com <mailto:cspacone@socal.rr.com>> wrote:
I should go to Mount Wilson and try that!

Re: AirspyHF+ VHF performance in RF-dense environment

jdow

Try it close to some of the FM broadcast stations, too. You can damn near hold a fluorescent bulb up in the air and light it from the RF next to some of the towers.

{^_-} (Out towards KONT)

On 20180218 10:04, Chris Spacone wrote:
I should go to Mount Wilson and try that!
HF+ = remarkable.
-Chris
-----Original Message-----
From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Dana Myers
Sent: Sunday, February 18, 2018 08:49
To: main@airspy.groups.io
Subject: [airspy] AirspyHF+ VHF performance in RF-dense environment
I took my R0 & HF+ (FW R1.3) up to major radio site yesterday (Mount Diablo in Northern California). I captured amateur packet APRS for several hours from the summit; this site has a very wide coverage area.
Not surprising, it is a popular commercial radio site, and I was parked within ~100m of a well-populated tower most of the time. While I do not know the exact mix of transmitters in the site these days, there are quite a VHF high-band transmitters and still some paging transmitters.
Most of the reception was at 144.39MHz.
My Airspy R0 was swamped until I turned the gain to ~6 in Linearity mode.
My AirspyHF+ didn't show any sign of the RF racket that I could discern.
Once again, that's a hot, strong VHF receiver!! Conventional amateur radios with wideband front-ends tend to overwhelm there; the HF+ behaved like a high-end land-mobile receiver.
Dana K6JQ

Re: AirspyHF+ VHF performance in RF-dense environment

Leif Asbrink

Hello Dana,

The HF+ will silently insert attenuation and degrade
NF in order to not become saturated by out-of-band
signals.

To really evaluate it you should evaluate S/N for
the stations of interest. Then, put attenuators in
front of your Airspy R0 until it is not swamped
and evaluate S/N for the same stations. That would
be a fair comparison. Set the Airspy R0 for maximum
decimation to make the bandwidth of the tuner chip
minimum.

My guess is that you will find that the difference
between R0 and HF+ is not so big - but that the latest
HF+ firmware will allow a more favourable gain distribution.
Tweak the parameters in both cases - and if it does not

HF+ is a good radio - but the R0 is not bad.

The HF+ with its automagic AGC control is however easier to use...

73

Leif

I took my R0 & HF+ (FW R1.3) up to major radio site yesterday (Mount Diablo
in Northern California). I captured amateur packet APRS for several hours
from the summit; this site has a very wide coverage area.

Not surprising, it is a popular commercial radio site, and I was parked
within ~100m of a well-populated tower most of  the time. While I do not
know the exact mix of transmitters in the site these days, there are quite
a VHF high-band transmitters and still some paging transmitters.

Most of the reception was at 144.39MHz.

My Airspy R0 was swamped until I turned the gain to ~6 in Linearity
mode.

My AirspyHF+ didn't show any sign of the RF racket that I could discern.
Once again, that's a hot, strong VHF receiver!! Conventional amateur
radios with wideband front-ends tend to overwhelm there; the HF+ behaved

Dana  K6JQ

Re: AirSpy HF R1.3/1644 Preamp on/off

Peter

Jaap De Goede wrote -

" So far I understood that the Spectrum Analyzer window is the result of a Fast Fourier Transformation of the HF tuner's digitized signal. I thought the AirSpy HF's HF Preamp would be either before or after the HF tuner. So the HF PreAmp status should affect the displayed level of the signal."

Ah well ... observation trumps expectation - hi !  (see https://airspy.com/downloads/HF+Architecture.png  )

One thing I have noted ... if the HF AGC is turned off, and some amount of manual HF ATT is applied, then that will persist in other applications using the HF+
eg : moving from SDR# to SDR Console, one will discover that the apparent HF+ signal level has dropped considerably !! ( by the amount of HF ATT applied )

It may be worthwhile bearing that in mind so as to protect user sanity   ;-)

Pete.

Re: AirspyHF+ VHF performance in RF-dense environment

Andrea IW0HDV

Off topic:

Is it _that_ Mount Wilson ?

(the one with Observatories  on top)

Andrea Montefusco IW0HDV

On Feb 18, 2018 19:14, "Chris Spacone" <cspacone@...> wrote:
I should go to Mount Wilson and try that!

Re: AirSpyHF+ IW0HDV ExtIO: new release with HF manual controls

Ruben Navarro Huedo (EA5BZ)

thank's !

AirSpyHF+ IW0HDV ExtIO: new release with HF manual controls

Andrea IW0HDV

prog, all,

A first attempt to implement an ExtIO for new HF manual controls is found here:

https://github.com/IW0HDV/extio-iw0hdv/releases/tag/v1.0.6-2-g77e17c8

Re: #airspyhfplus

VE7KED

Sounds good.

So, at this point I am going to let this run for 5 days, at the end of which I will give some daily and  average stats with the current firmware.  I have added additional receivers into the mix.  Anyone interested in live monitoring of 20 meter performance can check the pskreporter website.  Receivers will be reporting as follows:

VA7PSK - HF+
VE7KED - IC-7610
VA7PKT - IC-9100
VA7EEE - SDRPlay RSP2Pro

Multicoupler is a Stridesberg MCA104M fed by a 20 meter dipole at about 24 feet ASL in the attic.

Mike

GQRX 2.9 Raspberry Pi

Jaap De Goede <jaap.de.goede@...>

Hi,

GQRX 2.9 and Airspy HF+ work on Raspbian with the Raspberry Pi 3. Using the Rasbian November '17 image from the Rasberry Organization, you might face some issues:
• AM demodulation has an issue with the sound system, there is a continuous overflow. Possibly using another sample rate for the audio sink could help, yet that cannot be configured.
• To prevent overheating of the PI you could reduce the display rate of the waterfall.
Cheers, Jaap

Re: #airspyhfplus

Mike Millen

I, for one, find your testing of great interest, Mike.

If you're going to drop the daily reporting (no need, as far as I'm concerned) then please post a summary of your findings & opinions every few days or once a week at least.

Mike - M0MLM

On 18/02/2018 18:00, VE7KED wrote:
No the digi-sel is disabled.

You are right that band conditions and mixing of signals change for sure.  The purpose of this test is that my application is ft8 performance in the real world where this environment is where I spend all of my time.   The test is seeing how receievers hold up in this use situation.  I don't really care about how the receievr will work with a single signal in a prestine test environment where we can generate lab measurements.   I want to know how things are in an environment with 25 carriers mixing in close proximity to one another of varied signal strengths with a bit of human noise thrown into the mix for good measure.  There are settings and performance tweaks with the hardware and firmware which can make this excell or fail to some degree.  I'm sure we can all agree with this.

I'll spare the daily reporting since you guys are not seeing much value in this.  I though it may give some feedback on what changes happen when I update the firmware.  As each change made is not explicitly detailed to us, which I certainly don't expect and won't pretend I would understand in any meaningful way, I felt this might provide value to the developer who does know each little change made and what should be expected of same.

Re: AirspyHF+ VHF performance in RF-dense environment

Chris Spacone <cspacone@...>

I should bring one and document the results! Maybe next weekend.

-----Original Message-----
From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Dana Myers
Sent: Sunday, February 18, 2018 10:16
To: main@airspy.groups.io
Subject: Re: [airspy] AirspyHF+ VHF performance in RF-dense environment

On 2/18/2018 10:04 AM, Chris Spacone wrote:
I should go to Mount Wilson and try that!
If I was still living down there, I would :-) Though Mt Wilson has places were florescent bulbs always glow from the RF :-)

HF+ = remarkable.
Absolutely.

73,
Dana K6JQ

Re: sdrsharp-catcontroller plugin

Ruben Navarro Huedo (EA5BZ)

ohhhh GOOD !!!!
You are "my man" Mariano ;-)

Re: AirspyHF+ VHF performance in RF-dense environment

Dana Myers

On 2/18/2018 10:04 AM, Chris Spacone wrote:
I should go to Mount Wilson and try that!
If I was still living down there, I would :-)  Though Mt Wilson
has places were florescent bulbs always glow from the RF :-)

HF+ = remarkable.
Absolutely.

73,
Dana  K6JQ

Re: #airspyhfplus

prog

On Sun, Feb 18, 2018 at 10:14 am, VE7KED wrote:
Since I don't know what the many other fixes are
In fact, the defaults changed a bit - but they can be changed in 1.3 anyway.

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