[NLRS] Modding my 10Gig xverter for outboard pre-amp

[Dr. Gerald N. Johnson]

Go to www.geraldj.networkiowa.com/papers/2012 Look for DEMI. I wrote it 
up last year for MUD/NEWSVHF, this spring's SVHF and this summer's 
CSVHF. http://www.geraldj.networkiowa.com/papers/2012/OldDEMI10gcolor.pdf

There's an orange wire and and orange/white wire. The MGA 86576 needs no 
input bias so you can cut that trace. Needs no input tuning so you can 
cut that trace on the input. The output presently has 100 ohms the MGA 
needs 150 ohms from RX 12. There's another article there on the PPS-1 
bias supply that shows its connections.

73, Jerry, K0CQ


On 8/13/2012 6:18 PM, Bruce Richardson wrote:
>
>
> Hello all:
>
> I have a DEM 10GHz xverter that used the (now extinct) Fujitsu devices
> for receive on the 10GHz xverter, I'm switching to a DEM 2-stage pre-amp
> and need to get rid of this front device.
>
> I can see one voltage source going to the output of the Fujitsu and a
> different voltage going to the input.  I'm thinking I'm gonna just
> remove the resistors so that NO voltage goes to the receive path. Then
> I'm thinking I'm gonna run a new trace across the munged up area where
> the Fujitsu device has been sitting (and reinstalled numerous times).
> So should I use copper tape cut to be about the width of all the other
> receive signal lines?  Or should I just lay a bare wire for that half
> inch?
>
> With the 2-stage pre-amp, and the lumpiness as I bypass this area, will
> there be any problem with overdriving the "next" stage in the receive
> chain? (If you recall?)
>
> I've got the box open and just installed the A32 board. Don't know if it
> works yet, but modding for the outboard pre-amp has been a long time
> coming.
>
> Any thoughts?
>
> 73
> Bruce W9FZ
>
>