Hello all,
sorry for the offtopic (but these relais can be used also for a
PA...).
I want to build an antenna crossover switch for two radios and six
antennas and I have some 30A DPDT relais (the type is Finder 66.82 and you
can see the specification at http://www.hamlan.org/maco/s66en.pdf).
Assuming that the logic will avoid that the rigs will be connected to the
same antenna (sgrunt... ;-) ) and will avoid the "hot switching", do you
think that I can use these relays with 1500W and a maximum SWR of 3:1
(16-150OHM)?
The relay specification says that the minimum switching load must be
1W/10V/10mA, do you think that,after some period of storage without use, it
would be enough some RF (100W) for few seconds to clean the contacts and
remove the oxide?
Initially, I designed this series configuration
(http://www.hamlan.org/maco/macoser.pdf), but I thought that it would be not
safe to depend on too much relais...
Then, I went back to the classic parallel configuration with some grounding
to improve the isolation between ports
(http://www.hamlan.org/maco/maco.pdf).
At last, after some doubts about having 10A of RF (1500W with 16OHM) on
single contact, I designed this more simple version
(http://www.hamlan.org/maco/macofloat.pdf).
What do you think about the dielectric (relay plastic case) between contacts
with 470V of RF (1500W with 150OHM)?
I know that the layout is very important for the isolation between radios,
what layout do you think should be the best layout with these relais?
I think that any HAM transceiver can tolerate without damage, at least,
25-30dBm not on the same band, do you agree?
How much in band signal can be tolerated without damage, do you think that
15-20dBm is too much?
Thanks and 73
Guido, ik2bcp
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|