DigiRED Board

Projects RASDR
1

Hi, I would like to know if anyone have any idea where I can purchase the DigiRED board?

2

How many boards do you need? If just one, you can use design files to manufacture your own:

Andrew.

3

I need two units at this moment. I will check the information in provided link first.

4

Andrew, what is the process of manufacturing based on the designs? What kinds of equipment are required?
Would a big university have the facilities to build it?

5

Hello mahrud,

All information is in PCB database file [link]:

Board Description

board designation : DigiRED v1.0
board type : Lead Free
board size : 59.0 mm x 62.0 mm
board thickness : 1.6 mm +/- 10 %
board material : FR4
number of layers : 6
Gerber file format : RS-274-X
Solder Mask : Red

Top layer copper foil thickness : 18 um
Dielectric thickness between Top layer and 2nd layer: 180 um
Dielectric between Top layer and 2nd layer relative permittivity (Er): 4.4

Plating finish (both sides) : immersion gold
0.08-0.20 um of gold over
2.50-5.00 um of nickel

Edge connector plating : 1.27 um hard gold over 1.27 um nickel

Board Stackup

SMD paste Top : DigiRED_v1.0-F_Paste.gbp
Silk Top : DigiRED_v1.0-F_SilkS.gto
SolderMask Top : DigiRED_v1.0-F_Mask.gts

Top Layer : DigiRED_v1.0-Front_Cu.gtl
GND Layer : DigiRED_v1.0-GND_Cu.gbr
Inner Layer 1 : DigiRED_v1.0-Signal_1_Cu.gbr
Inner Layer 2 : DigiRED_v1.0-Signal_2_Cu.gbr
Power Layer : DigiRED_v1.0-Power_Cu.gbr
Bottom Layer : DigiRED_v1.0-Back_Cu.gbl

SolderMask Bottom : DigiRED_v1.0-B_Mask.gbs
Silk Bottom : DigiRED_v1.0-B_SilkS.gbo
SMD paste Bottom : DigiRED_v1.0-B_Paste.gbp

PCB edges : DigiRED_v1.0-Edge_Cuts.gbr

Drill map : DigiRED_v1-drl_map.pho
NC Drill file : DigiRED_v1.0.drl

Controlled Impedance

  1. 90 Ohm differential microstrip (Top layer)
    FR4, 180 um, Er = 4.4, tand = 0.025, metal thickness 18 um
    track width 280 um
6

Hello mahrud,

All information is in PCB database file [link]:

Board Description

board designation : DigiRED v1.0
board type : Lead Free
board size : 59.0 mm x 62.0 mm
board thickness : 1.6 mm +/- 10 %
board material : FR4
number of layers : 6
Gerber file format : RS-274-X
Solder Mask : Red

Top layer copper foil thickness : 18 um
Dielectric thickness between Top layer and 2nd layer: 180 um
Dielectric between Top layer and 2nd layer relative permittivity (Er): 4.4

Plating finish (both sides) : immersion gold
0.08-0.20 um of gold over
2.50-5.00 um of nickel

Edge connector plating : 1.27 um hard gold over 1.27 um nickel

Board Stackup

SMD paste Top : DigiRED_v1.0-F_Paste.gbp
Silk Top : DigiRED_v1.0-F_SilkS.gto
SolderMask Top : DigiRED_v1.0-F_Mask.gts

Top Layer : DigiRED_v1.0-Front_Cu.gtl
GND Layer : DigiRED_v1.0-GND_Cu.gbr
Inner Layer 1 : DigiRED_v1.0-Signal_1_Cu.gbr
Inner Layer 2 : DigiRED_v1.0-Signal_2_Cu.gbr
Power Layer : DigiRED_v1.0-Power_Cu.gbr
Bottom Layer : DigiRED_v1.0-Back_Cu.gbl

SolderMask Bottom : DigiRED_v1.0-B_Mask.gbs
Silk Bottom : DigiRED_v1.0-B_SilkS.gbo
SMD paste Bottom : DigiRED_v1.0-B_Paste.gbp

PCB edges : DigiRED_v1.0-Edge_Cuts.gbr

Drill map : DigiRED_v1-drl_map.pho
NC Drill file : DigiRED_v1.0.drl

Controlled Impedance

  1. 90 Ohm differential microstrip (Top layer)
    FR4, 180 um, Er = 4.4, tand = 0.025, metal thickness 18 um
    track width 280 um
7

Hi Mahrud and Andrew,
Sorry for not responding sooner; I just saw this while searching. We are gathering pledges to do a large production run of 100+ boards through the Society of Amateur Radio Astronomers. Please contact Melinda Lord/Treasurer at: http://radio-astronomy.org/contact-sara

Best Regards,
-bogdan

8

Excuse me, I had meant to provide a few additional important details:

  1. we will NOT be populating the transmit-side FX3 (USB3 chip) and its supporting components to save cost.
  2. the transmit-side USB connector and supporting components will REMAIN to provide auxiliary power when using USB2.0 on the receive side
  3. if you proceed to manufacture the board yourself from the design files, please note that R50,R52,R56 should be NOFIT. This ensures correct operation of the SPI Flash on power-up and RESET.

Also, I wanted to thank Andrew for being so responsive on this Forum. Its a real help to all of us.

Best Regards,
-bogdan

9

Hi Mahrud, Bogdan, Andrew et al.,
We’ve 7 digiREDs and myriadRFs in use in our RASDR2 radio astronomy SDRs. We just started our loaner problem and sent out 4 units. We might use a couple more digiREDs if anyone has them.

Our software for Win users is working well for observing hydrogen radio (H1) spectra with up to 28MHz bandwidth. Downloads and documentation are from www.rasdr.org the RASDR users group on Yahoogroups.

We expect to produce RASDR3, also using myriadRF of course, in mid-2016. Regular project updates appear in the SARA Journal.

Cheers and 73,
David