Date   
Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Marc olanie
 

Hi Kurt

David’s last video is not censored anymore by youtube -these guys are paranoïd-… but if you still can’t see it, leave the wonderful country of nordic legends and come and visit Europe :- )

 

…in other words, install a Tor navigator. Your country of origin will be masked and changed, even for the eyes of your local service provider (and to the Youtube’s eyes also)

Tor is a software router with several proxies randomly located around the world.

https://www.torproject.org/download/

it’s default web browser is Firefox

 

Have a nice movie session :- o

73’

Marc f6itu

 

De : ody-sdr@groups.io <ody-sdr@groups.io> De la part de Kurt Poulsen via Groups.Io
Envoyé : samedi 21 septembre 2019 12:37
À : ody-sdr@groups.io
Objet : Re: [ody-sdr] SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

 

Hi David

Sorry for a late response but my internet sucks for an extended periode of time due to land line problems (molds eating the isolation)

I noticed and still prompting “Distorted due to copyright”, but It does not matter and might even be an intended feature 😊

Kind regards

Kurt

 

Fra: ody-sdr@groups.io <ody-sdr@groups.io> På vegne af David Fainitski
Sendt: 16. september 2019 18:09
Til: ody-sdr@groups.io
Emne: Re: [ody-sdr] SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

 

[Edited Message Follows]

Hello,  Kurt
I have received accidentally some music under copyright protect. 
Try this 

https://youtu.be/1wKZJvoZehk

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Kurt Poulsen
 

Hi David

Sorry for a late response but my internet sucks for an extended periode of time due to land line problems (molds eating the isolation)

I noticed and still prompting “Distorted due to copyright”, but It does not matter and might even be an intended feature 😊

Kind regards

Kurt

 

Fra: ody-sdr@groups.io <ody-sdr@groups.io> På vegne af David Fainitski
Sendt: 16. september 2019 18:09
Til: ody-sdr@groups.io
Emne: Re: [ody-sdr] SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

 

[Edited Message Follows]

Hello,  Kurt
I have received accidentally some music under copyright protect. 
Try this 

https://youtu.be/1wKZJvoZehk

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Marc olanie
 
Edited

hi Steven
Any manufacturer will do the same. As long as the soldermask is wrong, all via are "tented" by default. This is specifically mentionned by all pcb manufacturers (and it's a necessity if you don't want shorts between vias and pads during a reflow process). It is strictly impossible to have some tenting if the gerber file shows a well defined solderpaste mask. 

To avoid this kind of trouble, a "no soldermask" zone and a solderpaste mask should be defined -and designed- for each IC if handsoldering is considered (and probably a large 1.5mm to 2 mm "super via"  for the gnd pad soldering when possible) 

in this case, you can circumvent the problem with a fiberglass pencil and scratch the tenting and the surrounding area of the lower side.  You can also (not recommanded) use a hot air reworking gun and solder your QFN after some pre-tinning the pads on the component side. That's what I call a "a phone repairer tip". Not elegant at all but it works (not always) 
73'
Marc f6itu
ps : using fiberglass pencils is a rather dangerous process. One should wear gloves, protective googles and a mask to avoid breathing small glass particles. The working area should be carefully cleaned after each operation. 

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Steven Wilson
 

Who manufacturered the boards?


On Fri, Sep 20, 2019, 2:42 PM David Fainitski <rolin791@...> wrote:

Hi All
Unfortunuately, I have received today spoiled PCB with insulated grounding vias for grounding pads of ICs.

Check your boards curefully

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

David Fainitski
 

Hi All
Unfortunuately, I have received today spoiled PCB with insulated grounding vias for grounding pads of ICs.

Check your boards curefully

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Andrew
 

Hi David,
I was just wondering, but agreed, 14 bits is a good choice for a low cost SDR. If you don't have strong local signals 12 bits is even better value at £23.78.
16 bit high speed converters seem to have a real premium, the now old, LTC2205 (65MSPS) is £62 here in the UK compared to the 14 bit ADS6142 at £30.
At the end of the day the difference in performance between a good 14 bit and a good 16 bit converter is small for most people.
Comparing typical datasheets...at 65MSPS:
LTC2205 (16 bit) SNR=78.9dB at 15MHz, SFDR=100dB at 15MHz, ENOB=12.8 bits at 15MHz, NF=~24dB (£62)
ADS6142 (14 bit) SNR=74.7dB at 10MHz, SFDR=95dB at 10MHz, ENOB=12.1 bits at 10MHz, NF=~27dB (£30)
ADS6122 (12 bit) SNR=71.7dB at 10MHz, SFDR=95dB at 10MHz, ENOB=11.6 bits at 10MHz, NF=~30dB (£23.78)
The price you pay is slightly worse noise figure and SFDR, 14 bits is a good sweet spot!
Looking forward to the new release.
Regards,
Andrew

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

David Fainitski
 

Hello, Andrew

LTC2165 now has a price like all the Micron SDR together with 14-bit ADC  :)

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Andrew
 

Hi David,
Thanks for the explanations, I look forward to seeing the new design.
Nice to have options for different ADCs, did you consider a 16 bit converter as an option I wonder?
Thanks,
Andrew

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

Leo Goto
 

I compared ody2 and SDR Micro (case only).
This size is smaller and cute than I expected. I like it very much.

Leo,

Re: building Ody2

David Fainitski
 

- On the "Ext. I/O" connector, SPI outputs, which "enable"  output has been chosen in the gateware ? TX or RX ? 
In other words, which part of the Alex protocol has been kept intact ? LPF and the 3 TX output, or HPF and the Xvtr/RX2/RX3/Bypass & external attenuator ?

If you want to use SPI control, here is the schematic of decoder

http://ody-sdr.com/wp-content/uploads/2017/09/SPI_decoder.jpg
Description of outputs here ( from SPI.v, firmware sources):

*****************************************

Modified by David Fainitski

for Odyssey-2 TRX project

2017

Bit       Function           I.C. Output

------ ------------             -----------

Bit 00 - 160 Meters LPF U1 - D0

Bit 01 - 80 Meters  LPF U1 - D1

Bit 02 - 60/40 Meters LPF U1 - D2

Bit 03 - 30/20 Meters LPF U1 - D3

Bit 04 - 17/15 Meters LPF  U1 - D4

Bit 05 - 12/10 Meters         U1 - D5

Bit 06 - 1.5 MHz HPF        U1 - D6

Bit 07 - 6.5 MHz HPF U1 - D7

Bit 08 - 9.5 MHz HPF    U2 - D0

Bit 09 - 13 MHz HPF         U2 - D1

Bit 10 - 20 MHz HPF        U2 - D2

Bit 11 - Bypass                U2 - D3

Bit 12 - 6M Preamp          U2 - D4

Bit 13 - ANT #2                  U2 - D5

Bit 14 - ANT #3                 U2 - D6

 

Bit 15 - Tx/Rx Relay           U2 - D7

This will work like Alex board control with the same cons. and pros.

Other way, you can use 7 User Outputs + ANT control pin and use filters which you want with no restrictions. Just install demultiplexer and have up to 127 control lines



On this screenshot, only 3 User Outputs and 7 control lines after demultiplexer enough for me for control my own LPF HPF

See the schematic https://easyeda.com/rolin791/HFPU-100

 

Re: SDR Micron - 14-bit Direct Digital Conversion Receiver with USB connection

David Fainitski
 

Hello, Andrew
Yes, I did one mistake on board design and decided also to make some changes. I don't want to show boards before I check them.

Next week I have plan to show you the final boards design and 2 more optional design with other ADC - AD9649 and LTC2255.

I will show also renewed firmware, BOM list and DigiKey CART.

Sorry for this fals-start. Leo Goto - please send me private message with your shipping address, I will ship to you new boards for free. This is my fault.

Re: building Ody2

Marc olanie
 

Thanks for the confirmation David. More questions to come :- ) 

Marc

Re: building Ody2

Marc olanie
 

Hi
While waiting for the last caps and my main oscillator... two other questions.

- On the "Ext. I/O" connector, SPI outputs, which "enable"  output has been chosen in the gateware ? TX or RX ? 
In other words, which part of the Alex protocol has been kept intact ? LPF and the 3 TX output, or HPF and the Xvtr/RX2/RX3/Bypass & external attenuator ? 
 
-  refl and fwd pwr on adc1 & adc2, I imagine, should be used in the same conditions needed by the hpsdr gateware (0/3.3v max for each input, control via PowerSDR.kisskonsole etc) 

This question just to know which filter I'll use, with which config and how I'll be able to control them
73'
Marc f6itu

Re: building Ody2

David Fainitski
 

Hi
Yes,  that is right. Leo is odyssey's expert now. 

Re: building Ody2

Marc olanie
 

Thanks Leo
That's what I though at first glance  (logically in the bias circuit, close to the RF Push-pull) 
I'll wait for a final confirmation from David
Tnks agn
Marc f6itu

Re: building Ody2

Leo Goto
 

Hi Marc f6itu,

I think *T.
But I am not sure.
I attached photo.

Leo,


On Mon, 16 Sep 2019 23:52:08 -0700
"Marc olanie" <Marc.olanie@...> wrote:

Marc f6itu
--
Leo Gotoh <LeoGoto@...>
http://travelx.org

Re: building Ody2

Marc olanie
 

Yet  another building question : 
where is located the 100k NTC ? 

Looking for it for more than 2 hours...  in vain
73'
Marc f6itu

Re: building Ody2

Marc olanie
 

>on dit 'RTFM' n'est-ce pas??

 

Definitely. Even in French :- ) If I received a quarter each time I had to repeat this mantra, I would be rich… incredibly rich

 

But, in my defence,  looking for  the value of a resistor (or discovering the fact that a resistor should be placed here) is generaly done by a schematic, not a manual :- o

 

Still some components to find (and a 1W resistor among them), and I will bug the list with more than stupid questions about the bootloader, firmware and gateware things.

 

73 to all

Marc f6itu

Re: building Ody2

dan edwards
 

on dit 'RTFM' n'est-ce pas??

ha ha 73, w5xz, dan


On Monday, September 16, 2019, 03:42:32 PM CDT, Marc olanie <Marc.olanie@...> wrote:


To myself and I

"read the f... manual, you bonehead !" (it's a 340 Ohms 1W resistor, David specified it in the instruction list)

... and I used 100nF decoupling caps for the fpga, I doubt it will hurt anything :- D 

73'
Marc f6itu

Re: building Ody2

Marc olanie
 

To myself and I

"read the f... manual, you bonehead !" (it's a 340 Ohms 1W resistor, David specified it in the instruction list)

... and I used 100nF decoupling caps for the fpga, I doubt it will hurt anything :- D 

73'
Marc f6itu