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565ycablenoise [2007/05/20 20:43] (current)
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 +====== Orion 28 MHz Noise Fix ======
 +**From the Ten-Tec Reflector October 20, 2006**
  
 +My Orion has decided to generate some noise on ten meters. ​ The receiver has frying hash at about 30 over 9, rendering the receiver useless. ​ Other receivers in the shack have NO noise on ten unless the Orion is powered up....yes the noise generated by the Orion can be heard in other receivers. ​ Orion is dead quiet on 12 and below. ​ Anyone else ever experience this and found a cure before I trouble the good folks at TenTec with this one?  thanks. ​ 73 bob de w9ge
 +
 +----
 +**October 20, 2006**
 +
 +Problem solved. ​ It was a rat shack Y cable attached to the +13 volt jack on the back of the Orion. ​ I had the heatsink fan powered thru the Y, with the other end unused. ​ Removing the Y cable and powering the fan directly from the +13 volt jack is fine.  Thanks so much to Hank for the suggestion. ​ 73 bob de w9ge
 +
 +----
 +**October 20, 2006**
 +
 +Interesting - I got a nice "​buzzing"​ on mine on 10m starting around 28.100 or so and going up through the top end of the band.  It was also from a cheapo "​y"​ cable run from +13.8VDC on the back to the fan and to the light on my 238B tuner. ​ I found if I unplugged the tuner, the noise went away, so it sounds like the "​Y"​ cables on the power can give some grief. ​ I thought it was partially a ground loop that was somehow propagating noise from the fan motor since it seemed to follow the fan RPM in tone.
 +
 +73,  Duane
 +
 +Duane Calvin, AC5AA
 +
 +----
 +**October 20, 2006**
 +
 +The Orion II operator'​s manual warns against using a "​Y"​ cable for this purpose (running the cooling fan and tuner light from the same source) for the reason (ground loop) you describe.
 +
 +Charles Delaune

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