[hpsdr] Fwd: Re: HamVNA 1.1

[mstangelo at comcast.net]

Dick,

Thanks for the update.

Mike N2MS
----- Original Message -----
From: Dick Faust <k9ivb at cox.net>
To: mstangelo at comcast.net
Cc: hpsdr at openhpsdr.org, conrad at g0ruz.com
Sent: Sat, 31 May 2014 16:14:24 -0000 (UTC)
Subject: Re: Fwd: Re: [hpsdr] HamVNA 1.1

Mike and others
I am presently with my Grandkids and do not have access to the source 
files for the revised Bridge.

I can convert just the updated Balun + Bead bridge that is on my web 
site.   I will generate Gerbers for  that board when i return in 2 weeks.
The board can then be ordered from OSH Park at a much lower cost than 
from Express PCB.  The OSH Park pricing is $5.00/Sq-in for 3 boards or 
about $2.50 / for this board in qty of 3.  Or for a 150 sq in run it is 
$1.00/Sq-in but would require over 100 boards.  Note the board is 
actually 2 boards and they must be cut apart and the 3 beads are 
connected in-between - See Sams notes or  look at Alex's picture - You 
woll need a piece of Brass or PCB to go under the beads and connect the 
grounds.

There is a set of Gerbers already there for the Dual TC1 bridge. There 
is a missing piece of foil on that layout between C1 and the OUT jack.  
I will also fix when I return.

The revised layouts have provision for additional resistors that Sam 
found helpful in achieving better balance.
Look at the VNA Parrts list File for more details and revised part 
values.  The Schematic of the Dual TC-1 shows their location.  VNA info 
in near the bottom of the page.

http://www.k9ivb.net/hermes/

Dick K9IVB


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