----- Original Message ----- From: "Angel Peláez, EA4DUT" angelkilroy@yahoo.es To: amsat-bb@amsat.org Sent: Friday, September 15, 2006 4:10 PM Subject: [amsat-bb] Preamp protection
Hi everybody:
I'm looking for the schematic diagram of a preamp protector against TX. I know the impressive quarter wave design with square brass stock and clamping diodes for 432 EME which Domenico, I8CVS, described I don't remember where.
Hi Angel, EA4DUT
Just to remember this is the link
http://www.k3pgp.org/432filter.htm
Rather I'm looking for something much compact as I would like to use from VHF to above. I mean one of these small boxes (RF diode clippers???) I see sometimes on commercial pages which promises withstand 25W for a short period I'll appreciate any comment about the issue.
I understand but the above filter/protection withstand much more and tested with 400 watt in to the input less than 80 mW was measured at the output.
While dimensions are for 70 cm they can be scaled in to any VHF/UHF/SHF band adding filtering to protection and it is very inexpensive and reliable.
Thanks in advance.
EA4DUT, Angel IN80FF
73" de
i8CVS Domenico