[hpsdr] Photos of SDR-1000, HPSDR, & LP Filters Enclosure Project

[Bill Tracey]

Tres Cool.  Thanks for sharing the pics.

Cheers,

Bill


At 11:26 AM 9/14/2007, Guy Atkins wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>HPSDR enthusiasts may be interested in four photos I've posted to the Web:
>
>http://www.guyatkins.com/files/sdr_front.jpg Front of homebrew
>SDR-1000/HPSDR (receive-only) enclosure with Griffin Powermate tuning knob
>and LW, MW1, MW2, and Bypass filter position switch.
>
>http://www.guyatkins.com/files/sdr_rear.jpg Rear view with USB ports for
>Griffin Powermate tuning knob and PC control line, antenna input BNC, audio
>in/out jacks, and cooling fan.
>
>http://www.guyatkins.com/files/sdr_inside.jpg Inside view, showing original
>SDR-1000 board stack along side of HPSDR "Ozy" control board and "Janus"
>sound card replacement board; W1VLF custom low pass filters for LW, MW1, MW2
>with shielded rotary switch; cooling fan; custom, balanced I/Q connection
>between SDR-1000 and Janus board; various other custom cables, including
>short DB25-to-DB25 IDC ribbon cable (replaces bulky parallel port cabling).
>Torroid and binocular core ferrites used throughout for RFI supression.
>
>http://www.guyatkins.com/files/sdr_inside2.jpg Another inside view of the
>homebrew SDR-1000/HPSDR receiver enclosure.
>
>I've recently completed the combining of my receive-only SDR-1000, HPSDR
>Janus and Ozy boards, and Paul Cianciolo W1VLF's low pass filter modules
>into a single enclosure. This effort does away with three separate
>assemblies and a snarl of external cabling, and makes the whole affair more
>compact and neater.
>
>I was going to need to build an enclosure for the HPSDR boards anyway, so I
>decided to repackage the entire SDR radio's components under "one roof." A
>Griffin Powermate USB knob is attached to the cabinet front for
>"traditional" knob tuning to complement keyboard/mouse control. The low pass
>filtering for longwave, medium wave lowband, medium wave highband, and a
>bypass position is accomplished by a four-position rotary switch to the left
>of the tuning knob.
>
>I avoided having to use a separate power supply for the HPSDR boards' +12V,
>-12V, and +5V requirements by supplying appropriate voltages directly from
>the SDR-1000 board stack. The -12VDC regulator on the HPSDR Janus board
>conveniently uses the -15V output from the SDR-1000's DC-DC converter as its
>input supply. I previously modded the DC-DC converter by replacing the stock
>chip with a much higher quality, low-RFI module bought on Ebay. (No more
>wandering spurs!)
>
>The SDR board stack conveniently sits on some unused Atlas board DIN
>connectors, and four spacers on the stack are insulated from the bottom of
>the Janus board. The stack is secured to Atlas with multiple loops of
>monofilament fishing line, around the stack spacers and tied through
>plated-thru holes in Atlas. A thin 1/8" sheet of medium-density foam fits
>between the upper Ten-Tec enclosure cover and the edges of all boards except
>Atlas. The slight pressure with this foam completes the securing of the
>boards and makes the assembly quite stable.
>
>One of the DIN connectors is still available for the future Mercury board,
>although I will have to move the project to a larger enclosure if I want to
>make more slots accessible for other HPSDR boards/devices.
>
>Lettering on the enclosure (a Ten-Tec BK-959) is still to come, but for now
>it's a fully functional SDR-1000 with improved dynamic range and lowered
>noise floor due to the HPSDR boards replacing the former Presonus Firebox
>sound card. I have yet to do any serious DXing with the radio connected to
>the HPSDR boards, since I hadn't used them until this project was completed.
>However, I'm heading north to the Queen Charlotte Islands (BC) today for a
>week-long DXpedition with other MW enthusiasts...the setup will get a
>thorough test soon!
>
>More details and photos on the low pass filters I use for trans-Pacific MW
>DXing with the SDR-1000 can be found here: www.sdr-1000.blogspot.com
>
>Guy Atkins KE7MAV
>Puyallup, WA



 1189819070.0