Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

donate to eham
   Home   Help Search  
Pages: Prev 1 [2] 3 Next   Go Down
  Print  
Author Topic: Red Pitaya stand alone TRX "DiscoRedTRX"  (Read 23733 times)
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #15 on: October 07, 2016, 01:00:42 PM »

New program version drives Audio Codec -> minimal delay

The new program version from Pavel Demin for his OpenHPSDR compatible Red Pitaya solution offers the minimizing of delay- times.
The program supports codec modules with WM8731 or TLV320. Pavel has told me, that this solution soon also for the DiscoRedTRX will be ready.
I have tested it successful with this modules:
http://www.mikroe.com/add-on-boards/audio-voice/audio-codec-proto/
In comparison with an analog receiver the delay is clear less than with audio in/out via PC and soundcard.

73, Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #16 on: January 02, 2017, 11:40:43 PM »

New Microphone with dynamic compression

Hi all, and a Happy New Year!
Let me show how you can make SSB QSO's with 10 Watts and good readability.
I bought this module:
http://www.elv.de/smd-mikrofonverstaerker-mit-limiter-smv-5-fertiggeraet.html
and put it with a battery, potentiometers and switches into a metallic case:


With help of my ham friends I found the best readability with low power.

In Germany we are allowed to transmit with 15 Watts on 60m. I tried it out and had some nice contacts inside Germany.



73, Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #17 on: February 06, 2017, 05:41:02 AM »

CW functionality added
First I had to make a new connector for a physical morse key:

Then I had the idea, to use the touchscreen in the functionality of a iambic keyer:

This is a new exercise (in progress)...
The intentions are:
- sending a series of dots, dashes,  .- or -. by touching the appropriate field
- switching to another sequence by gliding to that field
- end of character or number by untouching
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #18 on: February 08, 2017, 08:37:58 AM »

Little improvements:
- Monitor line (the grey line)
- insensitive area (circle in the middle) to prevent from errors.
- small squares to monitor the present touch state

Logged
WB8LBZ
Member

Posts: 54




Ignore
« Reply #19 on: February 09, 2017, 07:05:49 AM »

Hi Wolfgang,
   It's good to see you are making progress. I saw the older screen that said 120 next to keyer speed and I thought Wolfgang is good sending at 120 Words Per minute. Now I see you have it at 120 Bpm.
   On the German link, I saw a 330 Watt amplifier. Is this for possible future use? Any plans to use PSK, RTTY or WSJT-X in your future developments?

73, Larry  WB8LBZ
El Paso
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #20 on: February 09, 2017, 07:46:55 AM »

Hi Larry,
the 330 Watt amplifier is waiting for some additional things: Antenna tuner, RX/TX switch, casing, lowpass filter (or diplexer). I hope to get it homebrewed in some weeks.
  Because of my very slow morse crafts I have as next little step in my eye: program an alphanumerical touchscreen keyboard for comfortable morse keying. RTTY then would be no problem. The other modes (PSK and WSJT-X) require an access from the STM32F7 controller to the low frequency data stream, that is not realized by now. (But it would be possible, because we use the WDSP library (WDSP by Warren Pratt, NR0V DSP Library originally written for Windows Ported to Linux and Android by John Melton g0orx/n6lyt).
  Pavel Demin has made a bunch of programs for the Red Pitaya, WSPR included, please have a look at
http://pavel-demin.github.io/red-pitaya-notes/

Best 73's, Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #21 on: February 11, 2017, 08:20:46 AM »

The next step is done: layout for a touchscreen keyboard.

and in the other mode:

Some things are not yet ready...
Logged
WB8LBZ
Member

Posts: 54




Ignore
« Reply #22 on: February 13, 2017, 11:32:37 AM »

It looks good. The Y and Z are swapped. I noticed the Z because I use it in my call.

73, Larry  WB8LBZ
El Paso, TX

Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #23 on: February 14, 2017, 01:00:51 AM »

Hi Larry,
because I'm located in Germany, I use a german keyboard layout, also with "ÄÖÜß".
But it would be no problem to switch to another locale layout.
 A good friend, a cw enthusiast, gave me hints to make some improvements:
- F1 F2 F3 F4 instead of cq- automatic - (The texts behind F1.. are editable.)
- these keys (F1..F4) in the ground- layer layout, and a "/P" key, also a "?".
- keys for Edit-, Start-, and a Conversation mode.

HW??
73, Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #24 on: February 18, 2017, 10:12:56 AM »

Hi all,  here some news of my project:
First I wrote some texts for F1.. F4:


The texts must be editable, therefore one can use arrow keys for cursor positioning:



This is my newest approach, not yet ready...
73, Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #25 on: April 04, 2017, 01:11:37 AM »


Hi all,
here is the link to my new PowerPoint presentation of the DiscoRedTRX (in German), which is based on the RedPitaya and STM32F7Disco board:
http://wkiefer.bplaced.net/funk
It you don't have PowerPoint: Microsoft gives you the PowerPoint Viewer with no charge.
Best Regards,
Wolfgang Kiefer (DH1AKF)
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #26 on: June 13, 2017, 02:29:29 AM »

Completement of my presentation, converted to .pdf

Hi all,
because of some hints I have converted my presentation into a .pdf file.
It is now completed with new foils.

Please have a look at
 
http://wkiefer.bplaced.net/funk

If you also interested in other solutions with Red Pitaya, please click here (on the picture):

http://www.wkiefer.de/x28/

Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #27 on: July 02, 2017, 09:22:10 AM »

New functions
Hello OM's,
Thanks to the extensive library "WDSP", which originates from Warren C. Pratt (NR0V) and runs in the RedPitaya, I was without problems able to activate
- new modulation modes FM (more precisely NBFM) and SAM (synchronous detector),
- an Auto Notch filter,
- Noise Blanker as well
- two different Noise Reduction filters.

Users of the PowerSDR mRX program are familiar with these functions, but they have not yet been accessible in the DiscoRedTRX.
« Last Edit: July 02, 2017, 09:26:28 AM by DH1AKF » Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #28 on: August 05, 2017, 08:33:04 AM »

Finally with frequency display
It took a long time,
to activate the FFT (Fast Fourier Transformation), but now it is progressing.
The frequency display is still in an initial stage, but it was a "hard chunk" for my programming skills ...
You could also draw help lines and create a "waterfall diagram". The beginning is done.



73, Wolfgang
Logged
W9OY
Member

Posts: 1820


WWW

Ignore
« Reply #29 on: August 05, 2017, 12:25:49 PM »

Amazing project Congratulations
Logged
Pages: Prev 1 [2] 3 Next   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!