SDR up converter wont work

[Rich Flint]

Hi guys, Ive built the NE602 up converter from FAR circuits.  The VCC oscillator works great at 125Mhz until I hook it up to the C5 hooked to pin 6 of the NE602.  Then it goes away.   

Can anyone help?

Thanks!

Rich W0RGF

[yo2ldk]

i made this, and work nice !

http://yo2ldk.blogspot.ro/2012/07/up-converter-ne602-pentru-sdr-dongle.html

  good luck, and my best regards

alexander - yo2ldk

[Opendous]

  It would be easier to help if you included links to the article, your oscillator's datasheet, and pictures.

  The NE602/SA602 is designed to work with a resonant circuit so to connect an oscillator omit circuitry connected to pin 7.
http://www.qsl.net/k0lr/SW-RX/sw-rx.htm

  There are sensitivity issues with using the '602 in an MF/HF Upconverter:
http://f5rct.free.fr/explorer/Documents/Banc.Essai/HFconverterReport.pdf

[Rich Flint]

Thanks guys!  I discovered my problem was a poorly made board, with traces missing and holes not drilled in the proper places for parts placement.  This commercial board could never have worked!

[Rich Flint]

On Friday, March 15, 2013 10:39:26 AM UTC-6, Rich Flint wrote:

[Rich Flint]

Alexander and oppendus, I have indeed found the sensitivity of this up converter to be sorely lacking at HF.  Im intrigued by the designs using a simple J310 Fet.  I greatly appreciate your feedback!  Im using the article posted in January 2013 QST magazine, p.30.  My unit works great on VHF but not good with the NE602 upconverter.  Thanks again!

On Friday, March 15, 2013 10:39:26 AM UTC-6, Rich Flint wrote:

[jdow]

Er, what HF frequency and what kind of wet spaghetti noodle are you
using for an antenna?

{O.O}