Dave Richards AA7EE

June 24, 2013

The Etherkit CRX1 – A Handy Little VXO-controlled 40M Receiver Kit

Filed under: Ham Radio,QRP — AA7EE @ 5:14 pm
Tags: , , ,

Just a quick post to mention that Jason NT7S has developed what looks like a neat little 40M receiver kit, the CRX1.  It is VXO controlled, covers about 7030 – 7034KHz, and comes with  muting, transmit/receive switching and user-enabled sidetone, as well as a port for connecting an external VFO.  It sounds like a great little receiver for combining with home-brew transmitters and with the external VFO port, there is room for further development. It is all SMT, but with larger-sized SMT components and a board that is not very densely packed, making it a great first project for an experienced builder who wants to get his/her feet wet with SMT.

Here are the specifications (copied and pasted from Jason’s site) –

Frequency Range: Approximately 7.030 to 7.034 MHz (at +13.7 VDC power supply)
IF Bandwidth: Approximately 400 Hz
Current Consumption: 25 mA (at +13.7 VDC power supply)
Power supply: +9 VDC to +14 VDC
MDS: -123 dBm
3rd Order IMD DR: 84 dB
IF Rejection: 74 dB
Image Rejection: 67 dB
PCB dimensions: 70 mm x 100 mm
Antenna Connector: BNC
DC Power Connector: 2.1 mm barrel jack
Phone Jack: 3.5 mm stereo
Key Jack: 3.5 mm stereo
Muting, sidetone (user enabled), T/R switch, external VFO port included

More info here on Jason’s blog.

The CRX1 is not available as a “proper” kit yet but instead of selecting beta testers, as he has done in the past, Jason is selling 8 beta kits on his website for the sum of just $29. Because it comes with minimal documentation, it is only recommended for experienced kit builders. I have built 3 of Jason’s beta kits before and can testify that if you are good at soldering and know how to follow simple instructions, you’ll be fine. The beta documentation probably won’t give you a lot of hand-holding, but if you’ve done this sort of stuff before, you won’t have any problems.

If you’re in the mood for building something and have $29, this sounds like a good idea to me.

NOTE – I just noticed that the Etherkit store is now out of stock of the CRX1 beta. Hopefully we won’t have to wait too long for the production version of the kit.

5 Comments »

  1. “I just noticed that the Etherkit store is now out of stock of the CRX1 beta.”

    Yeah I bought the last two. I assembled a N3ZI DDS kit which works find fine and is just crying out to be a VFO for one of them. Both are somewhere in the postal service at this time… 73 de N9NFB

    Comment by vincemulhollon — July 3, 2013 @ 2:50 pm | Reply

    • Vince – I saw that there were 2 left in the Etherkit store then the next time I looked, they were gone. Those must have been yours.

      KB6QVI has been building his and reporting back in the Etherkit forum, so I’m looking forward to seeing the experiences of a few more builders in the forum. Good luck and hope yours arrive soon!

      Comment by AA7EE — July 3, 2013 @ 2:57 pm | Reply

  2. Just finished mine, and am enjoying it immensely. I would recommend it to anyone who wants to try a SMD build. Take a look: http://s222.photobucket.com/user/caulktel/media/photo5_zpsdece07a2.jpg.html%5D%5BIMG%5Dhttp://i222.photobucket.com/albums/dd4/caulktel/photo5_zpsdece07a2.jpg

    Comment by Joel KB6QVI — July 4, 2013 @ 2:03 am | Reply

  3. Lets try that link again:
    http://s222.photobucket.com/user/caulktel/media/photo5_zpsdece07a2.jpg.html

    Comment by Joel KB6QVI — July 4, 2013 @ 2:05 am | Reply

    • Joel – So sorry I took a while to reply – got caught up in things here. Those photos look great, and it’s very apparent that this would be a good beginner’s SMD kit – there’s a lot of space on that board. Thanks for the update!

      Dave
      AA7EE

      Comment by AA7EE — July 7, 2013 @ 6:22 pm | Reply


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