This information is provided completely  free of charge for non-commercial
use by individuals only. All warranties void though. No responsibility for
the circuits is taken,  nor will  I  take any responsibility  for anything
happening as a result of using any of this designs. Use of this designs in
or in conjuction with any commercial product  or with commercial purpouses
is expressly forbidden without prior consent.  Distribution for non-profit
is permitted provided the author is notified by email and all files remain
intact and without repackaging, including this notice.

AUI/AFC/IF/GUNN boards for KE5FX link
-------------------------------------
These are the boards I've designed for the original Ke5fx full speed ethernet
link in the amateur X band from 10.0-10.5GHz or also K band. This link is
descripted in his site, where you can find schematics, photos and construction
info. You can access the amateur packet radio network if you are the holder of
a license and callsign. Single side PCB.

You can substitute the MCL filters used in the original design with homemade
ones, taking the values from the table below, or can design your owns. 

Chevyshev
LP20MHz     C1,4=180p    C2,3=330p    L1,3=583n    L2=650n
LP200MHz    C1,4=18p     C2,3=33p     L1,3=58.3n   L2=65n
HP100MHz    C1,4=47p     C2,3=18p     L1,3=61.8n   L2=51.5n

Bessel
LP20MHz  C1=18p  C2=82p  C3=120p  C4=330p  L1=120n  L2=270n  L2=430n

Low pass and high pass filters can be arranged as shown, using the same pcb
holes of the canned ones. Althought isn't difficult to built these filters
you probably will need to tune its coils to get a good shape. 

There are 4 boards, that can be mounted piggy-back three one each other.
This link works in split frequencies, althought are halfduplex due to the
nature of the gunnplexer. For this reason you must set one side of the link
to 'high freq' and the other to 'low freq' in the 10mbuff board with jumpers
J5 and J6 to activate the AFC in only one side. All boards can be made single
sided, althought then the microstrip used won't be as such thing, with the
low IF frequency, really doesn't matter much. 

The NS LM6181 can be a replacement pin compatible for the OPA603. Althought
probably some resistor adjustment should be necessary for better performance. 

The 24GHz gunnplexer can be mounted in the PCB, but the 10GHz must be wired,
and the adjust divider of the power supply must be changed to modify the
output to about 8V. Althought the LM317T voltage regulator tab are very close
to the gunnplexer body, MUST be isolated, since the tab are connected to the
output voltage!. The voltage adjust range are aprox. between 5-6V, that are
the range specified for the 24GHz units. This one have a 0.75dB improvement
over the previous, that at this stage could be noticeable, thanks to the
Alan WA9GKA recommendation of arrange the transformer like a transitor with
an emiter resistor decoupled by a capacitor to maintain the mixer diode
loading at DC, and bypassing it at RF.


Files included in this package

README          This file
FILE_ID  DIZ    Package short description
10MAFCB .PS     PCB  layout in Postscript
10MAFCG .PS     PCB ground layout in Postscript (negative image)
10MAFCS .PS     Silk layout in Postscript
10MBUFFB.PS     PCB  layout in Postscript
10MBUFFG.PS     PCB ground layout in Postscript (negative image)
10MBUFFS.PS     Silk layout in Postscript
10MIFB  .PS     PCB  layout in Postscript
10MIFG  .PS     PCB ground layout in Postscript (negative image)
10MIFS  .PS     Silk layout in Postscript
GUN24G2B.PS     PCB  layout in Postscript
GUN24G2G.PS     PCB ground layout in Postscript (negative image)
GUN24G2S.PS     Silk layout in Postscript
10MAFC  .TXT    Partlist
10MBUFF .TXT    Partlist
10MIF   .TXT    Partlist
GUN24G2 .TXT    Partlist

Comments wellcomed!

Luis Yanes EB7GWL

mail: melus@esi.us.es
Ampr: eb7gwl.ampr.org [44.133.41.18]
AX25: EB7GWL@EA7MU.EACA.ESP.EU
http://www.esi.us.es/~melus/
