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: [1] 2 3 Next   Go Down
  Print  
Author Topic: Red Pitaya stand alone TRX "DiscoRedTRX"  (Read 23895 times)
DH1AKF
Member

Posts: 27


WWW

Ignore
« on: July 17, 2016, 02:43:41 AM »

Hello everyone,
my name is Wolfgang, located in Germany (DH1AKF).
With assistance of a hard working programmer, Pavel Demin (Belgium, Catholic University Louvain), we developed together a stand alone solution, consisting of the Red Pitaya and a STM32F7Disco board with touchscreen.
I invite you to see the pictures of this SDR solution, a work in progress...
http://www.wkiefer.de/x28/red_pitaya_stand_alone.htm

73, Wolfgang

p.s. The question is: Who wants to participate in the development?



« Last Edit: July 17, 2016, 03:51:58 AM by DH1AKF » Logged
AB7R
Member

Posts: 228




Ignore
« Reply #1 on: July 17, 2016, 09:28:55 AM »

Looks like an interesting project.  I would include 2 knobs for tuning vfo a and b.

Good luck
greg
ab7r
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #2 on: July 17, 2016, 12:46:55 PM »

Hi Greg,
thanks for the wishes!
But I cannot understand, why you prefer 2 knobs. Can you turn two knobs at the same time?  If you have seen the picture here, there is no need for any knob. All is done with some fingerstrikes on the touchscreen...
73, Wolfgang




Logged
AB7R
Member

Posts: 228




Ignore
« Reply #3 on: July 18, 2016, 07:41:22 AM »

Hi Wolfgang.  I say that ONLY because there are likely many folks out there who will balk at an SDR without at least a couple knobs for tuning.  While I don't mind tuning from a GUI, often times a knob to tune with is much more convenient.  Looking forward to see how your project progresses.  I am rigless right now but keeping my eyes open for a new SDR.  I had a 6700 but there were too many issues with the software for me that were not and are still not addressed.

GL!
Greg
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #4 on: July 19, 2016, 01:31:10 PM »

Now a big step forward: The housing takes form. Material: 30 years old PCB, soldering tin.



 
« Last Edit: July 20, 2016, 11:09:18 AM by DH1AKF » Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #5 on: July 20, 2016, 11:24:56 AM »

Last fitting (with all essential modules) before wiring:

Logged
WB8LBZ
Member

Posts: 54




Ignore
« Reply #6 on: July 21, 2016, 05:58:10 PM »

Hi Wolfgang,
   I am wondering why Disco Board was chosen.

73, Larry  WB8LBZ
El Paso, TX
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #7 on: July 21, 2016, 11:40:22 PM »

Hi Larry,
first of all for choosing the STM32F7 Disco is the low power consumption, max 500 mA at 5Volts. And this board meets all my needs:
capacitive touchscreen, USB connectors, (for future use: Ethernet, powerful audio, sufficient GPIO- Pins, and so on.
And there is a usable software library, a swell software development Environment: Eclipse plus the GCC system.
For wiring with the Red Pitaya I use a serial interface 115 kbaud.

73, Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #8 on: July 27, 2016, 12:49:26 PM »

Hi all,
now I have built two little, but also essential modules:
- the RX/TX- switch with an integrated step- attenuator (PE4306, 1..31 dB)
- the Stockton coupler (in ugly style) for SWR and Power metering.
73, Wolfgang




Logged
WB8LBZ
Member

Posts: 54




Ignore
« Reply #9 on: July 30, 2016, 10:36:31 PM »

Nice work Wolfgang. If it works it doesn't need to be pretty.

Larry in El Paso
WB8LBZ
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #10 on: August 05, 2016, 08:35:48 AM »

Now follows an exciting moment: First turn on the current...

Logged
WB8LBZ
Member

Posts: 54




Ignore
« Reply #11 on: August 05, 2016, 11:59:26 AM »

Hi again Wolfgang,
   I am wondering if you will need to cool the Red Pitaya for prolonged use and RF shielding from the Red Pitaya/amplifier/Disco.

Two Thumbs UP

Larry in El Paso
WB8LBZ
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #12 on: August 06, 2016, 02:26:28 AM »

Hi Larry,
for now I'm happy to hear the RX sound in my headset. Transmitting will be tested today.

Cooling: The Red Pitaya has a cooler with propeller. The case isn't shot tightly, but maybe there could be some more holes...
Shielding: You are right, that there is no shielding, except of the RF- cables. If this makes problems, I will built in some shieldings (RX/TX- switch, Stockton coupler ...)

ToDo list: A new menue to control the output power, one value for each ham band.

73, and thanks for your interest!
Wolfgang
Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #13 on: August 08, 2016, 12:42:21 PM »

Hi all,
very glad to tell you, that my project runs into success now!



The first QSO's were done on 80m over abt. 200 km distance, in the early evening, in SSB mode with 5 watts.
« Last Edit: August 08, 2016, 12:45:06 PM by DH1AKF » Logged
DH1AKF
Member

Posts: 27


WWW

Ignore
« Reply #14 on: August 12, 2016, 02:18:26 AM »

Hi all,
the first QSO's with my stand- alone TRX are done, in SSB on 80m with 8 watts. Next step is: activation of the "Tune" button and the CW capability.
A problem was the very dark modulation, but this could be solved with another electrete mic, with a built in amplifier and lift up of the higher frequencies.
All homebrew.
73's Wolfgang
Logged
Pages: [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!