[hpsdr] Mercury Spurious Emissions

[Steve Bunch]

I can also confirm this.  I connected Penny to an external antenna, and listened on a TS-790A connected to an external 2M halo, and an ICOM R-7000 connected to a vertical antenna, and received a faint signal on both.  I unplugged the antenna from Penny, and there was no perceptible change in the signal.  I turned off power, and the signal disappeared.  There does not appear to be significant signal making it out through the antenna, but rather it's being directly radiated from the boards/wires.

My Atlas and boards are in a rack-mount metal box, with audio, and Ethernet cables passing through holes.  Penny is connected by a short coax jumper to a BNC bulkhead thru-connector for the antenna.  The power cable inside the box is looped through a ferrite toroid and to a bulkhead unfiltered connector.  I'm looking for some ferrite filters to apply to the other wires to see if it makes a difference.  Interestingly enough, the signal doesn't even quite disappear if I turn the antenna selector switch on the 2M antenna to the TS-790A into a dead short (about 1M of cable from transceiver to antenna switch), though it's very weak.  Powerline-conducted, or radiated directly?  The two are about 10' apart, plugged into different outlets.

I tuned to 141.2624, 144.3346, and 147.4066 on the R-7000, and with a 50 ohm terminator on Penny's antenna lead, there was definitely a solid signal at all three frequencies.  The 147.4066 was the strongest.  When power is turned off, they disappear.

Steve, K9SRB

On Sep 10, 2011, at 4:17 AM, roland etienne wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi,
>  
> I can confirm hearing a spur on 144.384 Mhz on my IC706MK2G, coming from the HPSDR TRX, I think Steve is rigth, 47 * 3.072 ?
>  
> Roland, F8CHK
>  
>  
>  
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