[hpsdr] Hermes/ANAN-10 RX spurious signals?

[Berndt Josef Wulf]

G'day Dick,

can you post us some pictures?

73, Berndt
VK5ABN

On Sun, 2012-11-18 at 13:21 -0500, Dick Lichtel wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> I didn't take any pics but the implementation is pretty simple.
> 
> Materials: Brass Shim sheet from Ace hardware , though pretty much 
> anything that can be soldered to can work.
>                     Solder wick braid, used to ground the shield.
>                     Double sided tape, used to support/insulate the shield.
> 
> I cut a piece of brass to fit over the 10 MHz area, it sits on top of 
> the jumpers.  There isn't any need to cut holes in the shield, its just 
> a rectanglar piece.
> 
> With the board positioned with the 10MHz SMA jack(J25) facing up, the 
> shield  fits between J8/J9 (doesn't cover those jacks) on the left  
> extends to J24 on the right (J24 is covered) . It rests on the J16 leads 
> at the top and covers the 122 Mhz Osc  at the bottom.  I soldered a 
> piece of braid from to the alignment hole on next to the 10MHz SMA jack 
> (J25) to the shield. The connection to ground should be as short as 
> possible.
> 
> All the jumpers/leads in the area (J20/J22/J23/J24 and the leads on J16) 
> should be covered with tape. There is a small piece of tape  placed on 
> the 122 MHz for support on the bottom left corner. For the bottom right 
> corner, there is stack of double sided tape. For the stack of tape, I 
> didn't peal off the covering, so it doesn't leave sticky stuff on the 
> caps & resistors.
> 
> With the shield in place, the 10Mhz spur + harmonics are completely gone.
> 
> 
> Dick KD4JP
> 
>   I have not found any means to reduce the 24.5Mhz spurs. I think this 
> will require some support from Apache Labs.
> 
> 
> 
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