When it comes to HAM Amps antenna switching relays, you will be better off
in the long run by getting rid of the initial manufacturer components and
build the entire switching system your self. I know this sound radical, but
I believe that
Hams are capable of doing this job. Unless they discuss "dBs" on 14.178 :)
Manufacturers, in their relentless quest for profit will cut corners even on
critical system components.
We are using two relays for the output stages. One relay for the output
function and the other for the input function. This way you can tailor the
relays individually for bets cost/performance tradeoffs. I recommend for the
output
function an OMRON G8J-1C6T-R-DC12. This is an sturdy automotive, fully
encapsulated relay rated at 40ADC. We have tested it at 5KW/30MHz for
5 minutes and it did survive.
For the input function I will recommend the G2RL-1-E. This relay could be
replaced by more mundane one such the Magnecraft W7PCX which is very,very
tiny :)
You will thus need three relays . Two for input (one at the input, the
other at the output) and an output relay. If you nag me enough I could draw
a schematic for you :)
You have to research your on/off times to see if they will fit into your
project.
Also, I will _STRONGLY_ advise to use a sequencer (one 10c IC , 4 resistor
and 4 capacitors) with any complex relay system.
Good luck.
Alex
===================================
If we can accept the notion that GUNS are
the killers and not the people, why is it that
we can not accept the idea that CARS are
the speeders and not the drivers?
Alex, trying to understand the world around.
==================================.
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|