Re: Update of F6BVP SD card image Raspbian AX.25 distro

[email protected]

开云体育

I have just set it up and looking for FBB forwarding partners etc..

?

Kevin

?

From: Raspberry_Pi_4-Ham_RADIO@... [mailto:Raspberry_Pi_4-Ham_RADIO@...]
Sent: Wednesday, July 30, 2014 10:05 AM
To: Raspberry_Pi_4-Ham_RADIO@...
Subject: [Raspberry_Pi_4-Ham_RADIO] Update of F6BVP SD card image Raspbian AX.25 distro

?

Hello,

An update of AX.25 configured Raspbian distro SD card image is available for download.
Image size is 3.9 Gb. After expanding to an 8Gb SD card, system occupies 34% and 66% of the card is free.
It is based on January 2014 Raspbian distro with June 3.12.22 kernel.
Documentation page is here :

?

Main innovation is that graphic is handled by RPi hardware giving a better display performance
as demonstrated for example with Xastir APRS application.

73 de Bernard, f6bvp

Re: Pi-FM APRS Tracker?

[email protected]

#3343

Dear friends,
the attached file is the new release of the NBFM program, the narrow-band FM transmitter, for Raspbian distro.

Changes:
- name of program now ./nbfm (was ./nbfm.out Please modify your scripts).
- text frame and colors
- DMA used for higher frequency resolution (now <1kHz on 2m, was >10kHz)
- compiler optimization
- sub/audio tone frequency adjustment
- added output power level control

It would be very interesting if someone could give me reports on how it works on the field.
For example, the packet generator would be an interesting item to test.

As I've already said, the modulator is done using the DMA and it can't be so linear, but not only, because it also generates a lot of spurs.

Even if it charges more the CPU and degrades the modulation quality, the advantage of using higher sampling rates is the reduction of the spurs (that are not the harmonics).
Regarding this, please take a look at the following table, for 145MHz band (no subtone):

Sampling rate???? CPU load??? Output Power
?? 11025???????????? 10%???????? -3.2dB
?? 22500???????????? 16%???????? -0.7dB
?? 44100???????????? 29%???????? -0.2dB
?? 88200???????????? 48%????????? 0.0dB

That is to say if I have a 250mW amplifier, I can achieve about 250mW at the nominal frequency when using 88kHz sampling.
When, in the same conditions, I use 11kHz sampling, the output power is distributed more then a half to the spurs and less then a half to the nominal frequency (-3.2dB).
So my advice would be to use 22kHz, when spurs create problems, because it's a good compromise between modulation quality and spurs.

Up to 6m band (50MHz) the spurs are low so no problem to use 11kHz for sampling, and also the modulation is better because of the higher resolution.

73s
Ale
IK1PLD

Re: Pi-FM APRS Tracker?

#3342

1200 baud only? Any chance of getting the other speeds - 300, 2400, 4800,9600?

Use "-B 300" or "-B 9600" command line options.

Re: Pi-FM APRS Tracker?

#3341

A test utility, included with the Dire Wolf software TNC application, can
generate the audio for a given packet in the usual monitor format.
Cool...   Thanks!

$ echo -n 'WB2OSZ>WORLD:Hello, world!' | ./gen_packets -o x.wav -
1200 baud only?   Any chance of getting the other speeds - 300, 2400,
4800, 9600?

Bill, WA7NWP

Raspberry_Pi_4-ham_Radio at next year's Detroit Maker Faire?

James French

#3339

Wondering if anyone is close enough that would like to come out

next year for the Detroit maker Faire to show off their PI set up(s)?

I did not think of asking here because of the low volume of emails
from the group :(

I am looking for something 'new' to show off for next year.

Email me off list if your interested.

Next year will be the sixth year of the event and of ham radio being

present.

James W8ISS

Re: Pi-FM APRS Tracker?

#3338

 I had a thought about daisy-chaining a few utilities to make a Pi-FM APRStracker. I have not tested this yet and I am sure that there will be
problems with this many links, but has anyone done something similar to this
or have any thoughts? 


A test utility, included with the Dire Wolf software TNC application, can
generate the audio for a given packet in the usual monitor format.

It's normally not built as part of the installation process.  First you must
compile it:

$  make -f Makefile.linux gen_packets

Put the text representation of the packets in a file or just pipe it thru
stdin like this:  

$ echo -n 'WB2OSZ>WORLD:Hello, world!' | ./gen_packets -o x.wav -

The resulting audio is now in x.wav.   We can also take that audio and
extract packet data from it but first we need to build the standalone
demodulator.

$ make -f Makefile.linux atest

Don't worry about the error messages.  All we care about is the "atest"
executable file

Audio can be turned back into text like this:

$ ./atest x.wav


There is a bug in the current version of gen_packets where it will use a
builtin test message rather than reading from stdin.  That's good enough to
get started with testing the concept.

Pi-FM APRS Tracker?

#3340

I had a thought about daisy-chaining a few utilities to make a Pi-FM APRS tracker.? I have not tested this yet and I am sure that there will be problems with this many links, but has anyone done something similar to this or have any thoughts?

This would be the setup:
digital mode encoder-->soundcard TNC-->teewav-->pifm_sstv-->transmit

Dire Wolf soundcard TNC and APRS tracker:

teewave virtual soundcard output to wav file:

pifm_sstv script:

Rob
KD0FTJ

Pi-FM APRS Tracker?

#3337

I had a thought about daisy-chaining a few utilities to make a Pi-FM APRS tracker.? I have not tested this yet and I am sure that there will be problems with this many links, but has anyone done something similar to this or have any thoughts?

This would be the setup:
digital mode encoder-->soundcard TNC-->teewav-->pifm_sstv-->transmit

Dire Wolf soundcard TNC and APRS tracker:

teewave virtual soundcard output to wav file:

pifm_sstv script:

Rob
KD0FTJ

Re: Update of F6BVP SD card image Raspbian AX.25 distro

Ian

#3336

You are welcome David..
--------------------------------------------

Show quoted text

On Sun, 3/8/14, 'VK4UN' vk4un@... [Raspberry_Pi_4-Ham_RADIO] <Raspberry_Pi_4-Ham_RADIO@...> wrote:

 Subject: RE: [Raspberry_Pi_4-Ham_RADIO] Update of F6BVP SD card image Raspbian AX.25 distro
 To: Raspberry_Pi_4-Ham_RADIO@...
 Date: Sunday, 3 August, 2014, 6:54


 ?









       Thanks
 ian ?From:
 Raspberry_Pi_4-Ham_RADIO@...
 [mailto:Raspberry_Pi_4-Ham_RADIO@...]
 Sent: Thursday, 31 July 2014 11:45 PM
 To:
 Raspberry_Pi_4-Ham_RADIO@...
 Subject: RE: [Raspberry_Pi_4-Ham_RADIO]
 Update of F6BVP SD card image Raspbian AX.25
 distro ?? Hello David,

 Once you have downloaded the
 file and installed it you will find that it is in
 English.

 When on this page
 


 choose your connection
 type , the drop down selection after [ talle ]

 then click on the red box [
 valider et telecharger le fischier ]

 Install the downloaded file an off you go...

 Regards,
 Ian..
 --------------------------------------------
 On Wed, 30/7/14, 'VK4UN' vk4un@...
 [Raspberry_Pi_4-Ham_RADIO] <Raspberry_Pi_4-Ham_RADIO@...>
 wrote:

 Subject: RE:
 [Raspberry_Pi_4-Ham_RADIO] Update of F6BVP SD card image
 Raspbian AX.25 distro
 To: Raspberry_Pi_4-Ham_RADIO@...
 Date: Wednesday, 30 July, 2014, 22:55


 ?









 Just tried to
 download the file
 BUT it is not in English ?73’s ?David?
 VK4UN ?
 ?From:
 Raspberry_Pi_4-Ham_RADIO@...
 [mailto:Raspberry_Pi_4-Ham_RADIO@...]

 Sent: Thursday, 31 July 2014 3:05 AM
 To:
 Raspberry_Pi_4-Ham_RADIO@...
 Subject: [Raspberry_Pi_4-Ham_RADIO]
 Update of F6BVP SD card image Raspbian AX.25
 distro ?? Hello,

 An update of AX.25 configured Raspbian
 distro
 SD card image is available for
 download.
 Image size is 3.9 Gb. After
 expanding to an 8Gb
 SD card, system occupies
 34% and 66% of the card is free.

 It is based on January 2014 Raspbian distro
 with June 3.12.22 kernel.
 Documentation page
 is here
 :?
 

 Main innovation is that
 graphic is handled by RPi hardware giving a
 better display
 performance
 as demonstrated for example with
 Xastir APRS application.

 73
 de Bernard, f6bvp

 








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Re: Update of F6BVP SD card image Raspbian AX.25 distro

VK4UN

#3334

开云体育

Thanks ian

?

Show quoted text

From: Raspberry_Pi_4-Ham_RADIO@... [mailto:Raspberry_Pi_4-Ham_RADIO@...]
Sent: Thursday, 31 July 2014 11:45 PM
To: Raspberry_Pi_4-Ham_RADIO@...
Subject: RE: [Raspberry_Pi_4-Ham_RADIO] Update of F6BVP SD card image Raspbian AX.25 distro

?

Hello David,

Once you have downloaded the file and installed it you will find that it is in English.

When on this page

choose your connection type , the drop down selection after [ talle ]

then click on the red box [ valider et telecharger le fischier ]

Install the downloaded file an off you go...

Regards,
Ian..
--------------------------------------------
On Wed, 30/7/14, 'VK4UN' vk4un@... [Raspberry_Pi_4-Ham_RADIO] <Raspberry_Pi_4-Ham_RADIO@...> wrote:

Subject: RE: [Raspberry_Pi_4-Ham_RADIO] Update of F6BVP SD card image Raspbian AX.25 distro
To: Raspberry_Pi_4-Ham_RADIO@...
Date: Wednesday, 30 July, 2014, 22:55

?

Just tried to
download the file BUT it is not in English ?73’s ?David?
VK4UN ?
?From:
Raspberry_Pi_4-Ham_RADIO@...
[mailto:Raspberry_Pi_4-Ham_RADIO@...]
Sent: Thursday, 31 July 2014 3:05 AM
To:
Raspberry_Pi_4-Ham_RADIO@...
Subject: [Raspberry_Pi_4-Ham_RADIO]
Update of F6BVP SD card image Raspbian AX.25
distro ?? Hello,

An update of AX.25 configured Raspbian distro
SD card image is available for download.
Image size is 3.9 Gb. After expanding to an 8Gb
SD card, system occupies 34% and 66% of the card is free.

It is based on January 2014 Raspbian distro
with June 3.12.22 kernel.
Documentation page
is here :?

Main innovation is that
graphic is handled by RPi hardware giving a better display
performance
as demonstrated for example with
Xastir APRS application.

73
de Bernard, f6bvp

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Re: Raspberry Pi model B+

#3335

Ive had that sort of cable laying around back before I was even a HAM and was using Hi 8 video cameras....?

73 Mathison

On Sat, Aug 2, 2014 at 11:23 AM, k4gbb1@... [Raspberry_Pi_4-Ham_RADIO] <Raspberry_Pi_4-Ham_RADIO@...> wrote:

Show quoted text

?

I have such an adaptor right here on my desk.
It came with a protable DVD player.
The plug end has three rings and a tip connection.
The other end splits into three RCA jacks.
I've seen the plug on Adafruit, but I suspect that it won't be long before the
cable assembly will be available.

As for the GPIO connections... The first 26 pins have not changed.
As long as your header matches up with those pins you will be OK.

<>
??? k4gbb

Re: Raspberry Pi model B+

Ronny Julian

#3333

开云体育

The 4 conductor plugs are on eBay.? I bought several a year ago for use with my Yaesu FT-60 HTs.? I found the good shielded plugs The plug is also used on some iPhones so they are out there.

Ronny
K4RJJ

On 08/02/2014 02:23 PM, k4gbb1@... [Raspberry_Pi_4-Ham_RADIO] wrote:

Show quoted text

?

I have such an adaptor right here on my desk.
It came with a protable DVD player.
The plug end has three rings and a tip connection.
The other end splits into three RCA jacks.
I've seen the plug on Adafruit, but I suspect that it won't be long before the
cable assembly will be available.

As for the GPIO connections... The first 26 pins have not changed.
As long as your header matches up with those pins you will be OK.

<>
??? k4gbb

Re: Raspberry Pi model B+

#3332

I have such an adaptor right here on my desk.
It came with a protable DVD player.
The plug end has three rings and a tip connection.
The other end splits into three RCA jacks.
I've seen the plug on Adafruit, but I suspect that it won't be long before the
cable assembly will be available.

As for the GPIO connections... The first 26 pins have not changed.
As long as your header matches up with those pins you will be OK.

<<Charley>>
??? k4gbb

Code Practice

#3331

Here is a tid bit from Raspberry.org.


			Morse Code Virtual Radio How to program your Raspberry Pi to send, receive and decode Morse. 2014 marks the 100th anniversary of the declaration of Worl...
				Preview by Yahoo

Re: New file uploaded to Raspberry_Pi_4-Ham_RADIO

[email protected]

#3329

Please be careful using a script like mine: it writes and deletes 2 files to the SD card at each transmission. So, setting very frequent transmissions for a long time could cause damages to the memory card due to its writes limit.

73s

Ale

Re: New file uploaded to Raspberry_Pi_4-Ham_RADIO

[email protected]

#3330

Dear Bill I was thinking about 1200bps packet and my idea was to generate APRS or Cluster packets.

Anyway it is possible to transmit audio files containing packet radio baseband tones at any data rate, that is to say also 9600. A good implementation could be writing down a software that generates the audio file starting from the information to be transmitted. Then it's enough to tx the file via nbfm.out.

73s

Ale

Re: New file uploaded to Raspberry_Pi_4-Ham_RADIO

[email protected]

#3328

It is easy to set 2.5 instead of letting the internal default 5 kHz. Please consider it is a DMA modulator so it works as it can ;) 73s

Re: New file uploaded to Raspberry_Pi_4-Ham_RADIO

[email protected]

#3327

You're welcome. I'm happy it can be useful. 73s

Re: New file uploaded to Raspberry_Pi_4-Ham_RADIO

#3326

For those of us in the UK, I should point out that OUR "standard
deviation" on ALL of
the 2m band is 2.5kHz, not 5kHz!

73 Dave G4CLI

-- 
Dr David J Sadler-Lockwood G4CLI
Secretary and Web Master
Node Operator MB7IWR - IRLP:5918 - EchoIRLP 318283
Member of the RSGB Training and Education Committee
GB2RS Newsreader
Wakefield & District Radio Society
www.wdrs.org.uk
www,northerncrossrally.com

Re: New file uploaded to Raspberry_Pi_4-Ham_RADIO

#3325

As for an example, if you wish to transmit the audio file "cq.wav" (sampled at 11025Hz) on 145.500MHz with a standard 5kHz deviation and no frequency correction,
How about sending the same 'data' from the file as 9600 baud IP datagrams...


Bill