Topics

OT: AIRSPY HF+

Roelof Bakker
 

Hello all,

Alberto, I hope you don't mind this off-topic issue, however it might be interesting for some people on this list.

A few days ago my AIRSPY HF+ arrived and I tried it for chasing NDB's in the evening and on NAVTEX 518 kHz. At daytime I checked the ham bands and everything seems to be fine.

Today I looked for problems below 500 kHz and found spikes on multiples of about 42 kHz. Except one at 450 kHz, the levels are  low and with antenna connected are swamped by the band noise.

This afternoon, I noticed several broadcast stations, that should not be there. Notably at 300 kHz and 380 kHz:

graphic

The spurs around 372 kHz are from a plasma TV in the neighbourhood.

I can hear two stations, a Chinese spoken one and a station with pop-music. The latter is fading up and down.

Using a 3200 kHz low pass filter, the stations on 380 kHz are gone and with a 8500 kHz low pass filter, they are much, much weaker.

Looking for signals with HF-Span and a PERSEUS revealed strong signals above 9 MHz with levels of -35 to -40 dBm.

I have been able to track both stations down with the PERSEUS. The pop-station transmits on 9810 kHz and the Chinese one on 9430 kHz.
The difference is 380 kHz, so what we are hearing are the lower second order IMD products.

The picture above was whilst using a mini-whip antenna. A 2 x 16 m doublet produced the same result. Inserting a 50 ohm attenuator between antenna and AIRSPY HF+ helps for > 16 dB attenuation.
It is interesting to note that after awhile the stations on 380 kHz went away and others popped up on other frequencies.

As this is just a single sample test, it should be nice to know if this results can be reproduced elsewhere.

Best regards,
Roelof Bakker, pa0rdt
Middelburg, Netherlands
JO11tm



  

Alberto I2PHD
 

On 1/22/2018 4:37 PM, Roelof Bakker wrote:

Alberto, I hope you don't mind this off-topic issue, however it might be interesting for some people on this list.

A few days ago my AIRSPY HF+ arrived and I tried it for chasing NDB's in the evening and on NAVTEX 518 kHz. At daytime I checked the ham bands and everything seems to be fine.
...............................

Roelof,

    absolutely no problems. The Airspy HF+ is the hot topic of the moment, many seems to be enchanted with its resilience to intermodulation,
but there aren't enough real life tests to show this. To be honest there is a video from Leif Asbrink SM5BSZ comparing Airspy HF+ with Perseus.

https://www.youtube.com/watch?v=CRMxiePgA3E

If you have further tests with Airspy HF+ do not hesitate to post them, thanks.

--
73 Alberto I2PHD
Credo Ut Intelligam


Mauno_Ritola
 

Strange, that the results about dynamic range on Leif's video are exactly the opposite with the practical results by Bjarne and others:

https://app.box.com/s/2n25hpwioem1jo16wpql5yxguhl0seyk

Some even say, that there is no need for attenuation level adjustment in HF+, because it can't be saturated in normal conditions ...

Best regards,

Mauno


Alberto I2PHD kirjoitti 22.1.2018 klo 18:08:

On 1/22/2018 4:37 PM, Roelof Bakker wrote:

Alberto, I hope you don't mind this off-topic issue, however it might be interesting for some people on this list.

A few days ago my AIRSPY HF+ arrived and I tried it for chasing NDB's in the evening and on NAVTEX 518 kHz. At daytime I checked the ham bands and everything seems to be fine.
...............................

Roelof,

    absolutely no problems. The Airspy HF+ is the hot topic of the moment, many seems to be enchanted with its resilience to intermodulation,
but there aren't enough real life tests to show this. To be honest there is a video from Leif Asbrink SM5BSZ comparing Airspy HF+ with Perseus.

https://www.youtube.com/watch?v=CRMxiePgA3E

If you have further tests with Airspy HF+ do not hesitate to post them, thanks.

--
73 Alberto I2PHD
Credo Ut Intelligam


Roelof Bakker
 

Hello Mauno,

I have not seen a specification for second order IMD, which normally
should not be a problem with front end filtering in-line.

The second order intermodulation products I found are from stations
within the same Short Wave broadcast band and it will require tight
filtering to get rid of them, which is apparently not the case.

I gather a second order IMD lab test will be on order.

73,
Roelof Bakker, pa0rdt

Roelof Bakker
 

Hello all,

I just measured IP2 using the frequencies of the broadcast stations:

F1 = 9810 kHz, F2 = 9430 kHz, levels -40 dBm, level IP2 product at
380 kHz = -76 dBm

Using IP2 = P-in + R = -40 + (76-40) = - 4 dBm

73,
Roelof, pa0rdt

Hubert HB9JND
 

Roeloff,

thanks for the interesting information!
It would also be interesting if you could perform the same measurement with
the Perseus for comparison.

73, Hubert


-----Ursprüngliche Nachricht-----
Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von
Roelof Bakker
Gesendet: Montag, 22. Januar 2018 19:12
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

Hello all,

I just measured IP2 using the frequencies of the broadcast stations:

F1 = 9810 kHz, F2 = 9430 kHz, levels -40 dBm, level IP2 product at
380 kHz = -76 dBm

Using IP2 = P-in + R = -40 + (76-40) = - 4 dBm

73,
Roelof, pa0rdt

lasse moell
 

As Perseus have suboctave preselector filters, there is no contest.
IP2 should be 70-80 dB better :)
/Lasse

22 januari 2018 19:22:15 +01:00, skrev Hubert HB9JND <hubert.bollhalder@...>:

Roeloff,

thanks for the interesting information!
It would also be interesting if you could perform the same measurement with
the Perseus for comparison.

73, Hubert


-----Ursprüngliche Nachricht-----
Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von
Roelof Bakker
Gesendet: Montag, 22. Januar 2018 19:12
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

Hello all,

I just measured IP2 using the frequencies of the broadcast stations:

F1 = 9810 kHz, F2 = 9430 kHz, levels -40 dBm, level IP2 product at
380 kHz = -76 dBm

Using IP2 = P-in + R = -40 + (76-40) = - 4 dBm

73,
Roelof, pa0rdt






Hubert HB9JND
 

To be fair, you can turn off the preselector on the Perseus during the test.

 

Hubert

 

 

Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von lasse moell
Gesendet: Montag, 22. Januar 2018 19:26
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

 

As Perseus have suboctave preselector filters, there is no contest.

IP2 should be 70-80 dB better :)

/Lasse

 

22 januari 2018 19:22:15 +01:00, skrev Hubert HB9JND <hubert.bollhalder@...>:

Roeloff,

 

thanks for the interesting information!

It would also be interesting if you could perform the same measurement with

the Perseus for comparison.

 

73, Hubert

 

 

-----Ursprüngliche Nachricht-----

Roelof Bakker

Gesendet: Montag, 22. Januar 2018 19:12

Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

 

Hello all,

 

I just measured IP2 using the frequencies of the broadcast stations:

 

F1 = 9810 kHz, F2 = 9430 kHz, levels -40 dBm, level IP2 product at

380 kHz = -76 dBm

 

Using IP2 = P-in + R = -40 + (76-40) = - 4 dBm

 

73,

Roelof, pa0rdt

 

 

 

 

 

 

lasse moell
 

Why?
This is one of the things that make our Perseus a good performer.....
Still the Perseus may come out on top, as the gain is almost none infron t of the A/D, and the Airspy seems to be quite sensitive, indicating there is plenty of gain ahead of the A/D, which is reflected in the poor IP2 number.

22 januari 2018 19:34:35 +01:00, skrev Hubert HB9JND <hubert.bollhalder@...>:

To be fair, you can turn off the preselector on the Perseus during the test.

 

Hubert

 

 

Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von lasse moell
Gesendet: Montag, 22. Januar 2018 19:26
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

 

As Perseus have suboctave preselector filters, there is no contest.

IP2 should be 70-80 dB better :)

/Lasse

 

22 januari 2018 19:22:15 +01:00, skrev Hubert HB9JND <hubert.bollhalder@...>:

Roeloff,

 

thanks for the interesting information!

It would also be interesting if you could perform the same measurement with

the Perseus for comparison.

 

73, Hubert

 

 

-----Ursprüngliche Nachricht-----

Roelof Bakker

Gesendet: Montag, 22. Januar 2018 19:12

Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

 

Hello all,

 

I just measured IP2 using the frequencies of the broadcast stations:

 

F1 = 9810 kHz, F2 = 9430 kHz, levels -40 dBm, level IP2 product at

380 kHz = -76 dBm

 

Using IP2 = P-in + R = -40 + (76-40) = - 4 dBm

 

73,

Roelof, pa0rdt

 

 

 

 

 

 

 


Roelof Bakker
 

Hello Hubert,

Two tones of -40 dBm is to low to measure the PERSEUS reliably.

With tones of -20 dBm, the second order product at 380 kHz is -110
dBm. IP2 = -20 + (110-20) = + 70 dBm. This is with pre-selector,
pre-amp and dither off.

With pre-selector on, tones of -10 dBm were used and the second
order product at 380 kHz was -104 dBm. IP2 = -10 + (104-10) = +84
dBm.

It should be noted that the measurent on the AIRSPY HF+ has used
this particular frequencies as the problem was noted there. Other
frequency pairs in the HF range might give different results.

73,
Roelof, pa0rdt

Hubert HB9JND
 

Hello Roelof

Oh - quite a difference!
Thanks for the insightful measurements.
The results point in the same direction as Leif's measurements concerning
dynamic range.

vy 73, Hubert


-----Ursprüngliche Nachricht-----
Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von
Roelof Bakker
Gesendet: Montag, 22. Januar 2018 19:49
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

Hello Hubert,

Two tones of -40 dBm is to low to measure the PERSEUS reliably.

With tones of -20 dBm, the second order product at 380 kHz is -110
dBm. IP2 = -20 + (110-20) = + 70 dBm. This is with pre-selector,
pre-amp and dither off.

With pre-selector on, tones of -10 dBm were used and the second
order product at 380 kHz was -104 dBm. IP2 = -10 + (104-10) = +84
dBm.

It should be noted that the measurent on the AIRSPY HF+ has used
this particular frequencies as the problem was noted there. Other
frequency pairs in the HF range might give different results.

73,
Roelof, pa0rdt

Werner Karn
 

Thanks Roelof for this interesting info.With that poor data, this receiver would be useless for me.

Regards

Werner 

2018-01-22 20:25 GMT+01:00 Hubert HB9JND <hubert.bollhalder@...>:

Hello Roelof

Oh - quite a difference!
Thanks for the insightful measurements.
The results point in the same direction as Leif's measurements concerning
dynamic range.

vy 73, Hubert


-----Ursprüngliche Nachricht-----
Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von
Roelof Bakker
Gesendet: Montag, 22. Januar 2018 19:49
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

Hello Hubert,

Two tones of -40 dBm is to low to measure the PERSEUS reliably.

With tones of -20 dBm, the second order product at 380 kHz is -110
dBm. IP2 = -20 + (110-20) = + 70 dBm. This is with pre-selector,
pre-amp and dither off.

With pre-selector on, tones of -10 dBm were used and the second
order product at 380 kHz was -104 dBm. IP2 = -10 + (104-10) = +84
dBm.

It should be noted that the measurent on the AIRSPY HF+ has used
this particular frequencies as the problem was noted there. Other
frequency pairs in the HF range might give different results.

73,
Roelof, pa0rdt







Mauno_Ritola
 

I don't think I have ever seen theoretical and practical observations to be this far from each other. Is it then so, that the ones, that so far have praised HF+ that much, didn't just happen to have any strong signals in other frequency segments to saturate it?

Best regards,

Mauno


Hubert HB9JND kirjoitti 22.1.2018 klo 21:25:

Hello Roelof

Oh - quite a difference!
Thanks for the insightful measurements.
The results point in the same direction as Leif's measurements concerning
dynamic range.

vy 73, Hubert


-----Ursprüngliche Nachricht-----
Von: Perseus-SDR@groups.io [mailto:Perseus-SDR@groups.io] Im Auftrag von
Roelof Bakker
Gesendet: Montag, 22. Januar 2018 19:49
An: Perseus-SDR@groups.io
Betreff: Re: [Perseus-SDR] OT: AIRSPY HF+

Hello Hubert,

Two tones of -40 dBm is to low to measure the PERSEUS reliably.

With tones of -20 dBm, the second order product at 380 kHz is -110
dBm. IP2 = -20 + (110-20) = + 70 dBm. This is with pre-selector,
pre-amp and dither off.

With pre-selector on, tones of -10 dBm were used and the second
order product at 380 kHz was -104 dBm. IP2 = -10 + (104-10) = +84
dBm.

It should be noted that the measurent on the AIRSPY HF+ has used
this particular frequencies as the problem was noted there. Other
frequency pairs in the HF range might give different results.

73,
Roelof, pa0rdt






Roelof Bakker
 

Hello Werner,

Dispite the rather poor IP2, I just received NAVTEX Japan on it on
518 kHz, which is very rare. I am stunned...

---
20180122 1805 518 $11H JNR Moji,JPN 9219
2018-01-22 18:05:56> ZCZC HB80
2018-01-22 18:05:59> 221800 UTC~JAN 18
2018-01-22 18:06:02> WWJP82 RJTD 221500
2018-01-22 18:06:07> VITAL [WARNING] FOR MOJI NAVTEX AREA
2018-01-22 18:06:13> 221500UTC ISSUED AT 221800UTC
2018-01-22 18:06:21> DEVELOPING LOW 992HPA AT 35N 143E MOV ENE 45 KT
2018-01-22 18:06:32> FCST POSITION FOR 230300UTC AT 40N 148E WITH
UNCERTANITY OF 85 MILES
2018-01-22 18:06:33> RADIUS
2018-01-22 18:06:46> FCST POSITION FOR 231500UTC AT 45N 153E WITH
UNCERTANITY OF 130 MILES
2018-01-22 18:06:47> RADIUS
2018-01-22 18:06:56> DEVELOPING LOW 1004HPA AT 40N 135E MOV ENE 10
KT
2018-01-22 18:07:07> FCST POSITION FOR 231500UTC AT 45N 139E WITH
UNCERTANITY OF 85 MILES
2018-01-22 18:07:09> RADIUS
2018-01-22 18:07:19> STORM WARNING SEA OFF SOUTHERN COAST OF
MARITIME PROVINCE WITH MAX
2018-01-22 18:07:25> WINDS 55 KT SEA OFF NOTO WITH 50 KT
2018-01-22 18:07:35> GALE WARNING NORTHWESTERN PART OF JAPAN SEA,
SEA EAST OF OKI SYOTO
2018-01-22 18:07:45> AND AROUND WAKASA WAN, SEA WEST OF OKI SYOTO
WITH 40 KT SETONAIKAI,
2018-01-22 18:07:54> NORTHERN SEA OFF SHIKOKU, TSUSHIMA KAIKYO WITH
35 KT
2018-01-22 18:08:05> WARNING(NEAR GALE) SEA WEST OF CHEJU ISLAND,
SEA WEST OF NAGASAKI,
2018-01-22 18:08:09> SEA OFF KAGOSHIMA
2018-01-22 18:08:15> NXT WARNING WILL BE ISSUED BEFORE 230000UTC
2018-01-22 18:08:15> =
2018-01-22 18:08:17> NNNN

73,
Roelof, pa0rdt

Roelof Bakker
 

Hello Mauno,

I gather not many people listen at LF at daytime.

To proof your words, this was just received on NAVTEX 518 kHz.
Unlike at your location this is very rare!

---
20180122 1805 518 $11H JNR Moji,JPN 9219
2018-01-22 18:05:56> ZCZC HB80
2018-01-22 18:05:59> 221800 UTC~JAN 18
2018-01-22 18:06:02> WWJP82 RJTD 221500
2018-01-22 18:06:07> VITAL [WARNING] FOR MOJI NAVTEX AREA
2018-01-22 18:06:13> 221500UTC ISSUED AT 221800UTC
2018-01-22 18:06:21> DEVELOPING LOW 992HPA AT 35N 143E MOV ENE 45 KT
2018-01-22 18:06:32> FCST POSITION FOR 230300UTC AT 40N 148E WITH
UNCERTANITY OF 85 MILES
2018-01-22 18:06:33> RADIUS
2018-01-22 18:06:46> FCST POSITION FOR 231500UTC AT 45N 153E WITH
UNCERTANITY OF 130 MILES
2018-01-22 18:06:47> RADIUS
2018-01-22 18:06:56> DEVELOPING LOW 1004HPA AT 40N 135E MOV ENE 10
KT
2018-01-22 18:07:07> FCST POSITION FOR 231500UTC AT 45N 139E WITH
UNCERTANITY OF 85 MILES
2018-01-22 18:07:09> RADIUS
2018-01-22 18:07:19> STORM WARNING SEA OFF SOUTHERN COAST OF
MARITIME PROVINCE WITH MAX
2018-01-22 18:07:25> WINDS 55 KT SEA OFF NOTO WITH 50 KT
2018-01-22 18:07:35> GALE WARNING NORTHWESTERN PART OF JAPAN SEA,
SEA EAST OF OKI SYOTO
2018-01-22 18:07:45> AND AROUND WAKASA WAN, SEA WEST OF OKI SYOTO
WITH 40 KT SETONAIKAI,
2018-01-22 18:07:54> NORTHERN SEA OFF SHIKOKU, TSUSHIMA KAIKYO WITH
35 KT
2018-01-22 18:08:05> WARNING(NEAR GALE) SEA WEST OF CHEJU ISLAND,
SEA WEST OF NAGASAKI,
2018-01-22 18:08:09> SEA OFF KAGOSHIMA
2018-01-22 18:08:15> NXT WARNING WILL BE ISSUED BEFORE 230000UTC
2018-01-22 18:08:15> =
2018-01-22 18:08:17> NNNN

73,
Roelof

Werner Karn
 

Hello Roelof,

winter conditions and sunrise in Japan ?    ( and no IP2 ghost on 581 -:) )

2018-01-22 22:00 GMT+01:00 Roelof Bakker <roelof@...>:

Hello Mauno,

I gather not many people listen at LF at daytime.

To proof your words, this was just received on NAVTEX 518 kHz.
Unlike at your location this is very rare!

---
20180122 1805 518 $11H JNR Moji,JPN                    9219
2018-01-22 18:05:56> ZCZC HB80
2018-01-22 18:05:59> 221800 UTC~JAN 18
2018-01-22 18:06:02> WWJP82 RJTD 221500
2018-01-22 18:06:07> VITAL [WARNING] FOR MOJI NAVTEX AREA
2018-01-22 18:06:13> 221500UTC ISSUED AT 221800UTC
2018-01-22 18:06:21> DEVELOPING LOW 992HPA AT 35N 143E MOV ENE 45 KT
2018-01-22 18:06:32> FCST POSITION FOR 230300UTC AT 40N 148E WITH
UNCERTANITY OF 85 MILES
2018-01-22 18:06:33> RADIUS
2018-01-22 18:06:46> FCST POSITION FOR 231500UTC AT 45N 153E WITH
UNCERTANITY OF 130 MILES
2018-01-22 18:06:47> RADIUS
2018-01-22 18:06:56> DEVELOPING LOW 1004HPA AT 40N 135E MOV ENE 10
KT
2018-01-22 18:07:07> FCST POSITION FOR 231500UTC AT 45N 139E WITH
UNCERTANITY OF 85 MILES
2018-01-22 18:07:09> RADIUS
2018-01-22 18:07:19> STORM WARNING SEA OFF SOUTHERN COAST OF
MARITIME PROVINCE WITH MAX
2018-01-22 18:07:25> WINDS 55 KT SEA OFF NOTO WITH 50 KT
2018-01-22 18:07:35> GALE WARNING NORTHWESTERN PART OF JAPAN SEA,
SEA EAST OF OKI SYOTO
2018-01-22 18:07:45> AND AROUND WAKASA WAN, SEA WEST OF OKI SYOTO
WITH 40 KT SETONAIKAI,
2018-01-22 18:07:54> NORTHERN SEA OFF SHIKOKU, TSUSHIMA KAIKYO WITH
35 KT
2018-01-22 18:08:05> WARNING(NEAR GALE) SEA WEST OF CHEJU ISLAND,
SEA WEST OF NAGASAKI,
2018-01-22 18:08:09> SEA OFF KAGOSHIMA
2018-01-22 18:08:15> NXT WARNING WILL BE ISSUED BEFORE 230000UTC
2018-01-22 18:08:15> =
2018-01-22 18:08:17>  NNNN

73,
Roelof



Bjarne Mjelde
 

I've been testing the HF+ since early January, also comparing it with the Perseus and Cloud-IQ on two locations.
Yes, on LF the HF+ has some "issues", and it has been noted by several, including me. 
My tests are almost exclusively on MF though. So far, it has proven to be a very competent receiver, and by far the best of the four small, low-price SDRs I have tested the past 6 months or so.
Last weekend an extremely strong signal burst on low LF caused both the Cloud-IQ and the Perseus to saturate. The HF+ didn't.
So, be curious! Don't jump to conclusions, and don't believe everything you read ;-)

Bjarne Mjelde
arcticdx.blogspot.com

Mauno_Ritola
 

Bjarne Mjelde kirjoitti 23.1.2018 klo 7:57:
I've been testing the HF+ since early January, also comparing it with the Perseus and Cloud-IQ on two locations.
Yes, on LF the HF+ has some "issues", and it has been noted by several, including me.

OK, I must have missed those, what I read most carefully was your Smøla report.

My tests are almost exclusively on MF though. So far, it has proven to be a very competent receiver, and by far the best of the four small, low-price SDRs I have tested the past 6 months or so.
Last weekend an extremely strong signal burst on low LF caused both the Cloud-IQ and the Perseus to saturate. The HF+ didn't.
So, be curious! Don't jump to conclusions, and don't believe everything you read ;-)

I *am* curious, that's why I am reading these! Also, I don't have the time or money to buy every model myself and test them. And I think at least most testers have a desire to be believed in ;-) Hopefully the problematic situations & surroundings will be clarified further.

Best regards,

Mauno


Bjarne Mjelde
arcticdx.blogspot.com

Bjarne Mjelde
 

You haven't really missed anything Mauno, I'm still investigating. A write-up will appear. However, I see that people are expressing opinions about it,  maybe without having tested one, so I need to be very certain about my conclusions. As I mentioned in my previous post, Roelof's observations on LF is confirmed by several others, including me at Smøla island. A firmware update is said to possibly address this, but I need to be physically at the receiver to do it. It has not been observed at MF though, to my knowledge.
Now, to be REALLY off topic (sorry! won't happen again!), those who want can do this blind test of the Perseus/Jaguar and HF+. If you want to know which is which, email me with your guess.
https://www.dropbox.com/s/1ulruaq569mojhf/1520_recording%20one.mp3?dl=0
https://www.dropbox.com/s/jjz8kwy9dc29u8u/1520%20recording%20two.mp3?dl=0

Bjarne Mjelde
arcticdx.blogspot.com

Roelof Bakker
 

Hello Bjarne, Mauno,

I have done the update and believe it went well.

It is said to improve HF AGC by 6 dB, which is probably too little
as the IP2 products from broadcasters around 9600 kHz are still
there.

Bjarne, I agree with you that the AIRSPY HF+ is better than e.g. the
SDRPlay RSP1, which definitely needs a 530 kHz low pass filter for
proper LF reception.

It is certainly not my intention do downgrade the AIRSPY HF+. I am
just passing on my observations. Personally the IP2 products at LF
are no problem as a low pass filter compeletely eliminates them.
I consider it fun to get receivers to work proper, but some need
very little attention in this regard.

Bjarne, do you know if there is a way to read the firmware version?

Thanks in advance.

73,
Roelof Bakker