I was not aware of these little pcb coax relays. I think one could
make a neat CP reversal switch using them on a pcb that could handle
normal satellite RF levels (100w) at a reasonable cost. Much better
than what is used on KLM CP antennas.
One could make switching preamps using two of them
I'm glad you shared this all here Mark, I have a 2M Landwehr that's been
cranking along since 1993 or so, I've never looked inside but this thread
is something I'll keep in case it gets flaky on me.
73,
Jerry
NØJY
___
Sent via AMSAT-BB@amsat.org.
Hi Mark, N8MH and All guys on the list.
I am very happy that you solved the problem on your preamplifier and since
you took the cover off I would like to know if the relays are or not
COAXIAL RELAYS or just non constant impedance relays for AC or DC
applications.
Can you take a picture on the
Hello Domenico I8CVS,
I did take pictures while I had the cover off :) You can see and download them
here:
https://sites.google.com/site/marklhammond/hamradio
Indeed, they are labeled COAXIAL RELAYS as you suspected.
You can also see the little white button on the relays that I mentioned
One more update: the relays can be purchased here!
http://radiodan.com/ted_stuff/tohtsu.htm
73,
Mark N8MH
At 09:33 PM 6/1/2011 -0400, Mark L. Hammond wrote:
Hello Domenico I8CVS,
I did take pictures while I had the cover off :) You can see and download
them here:
Hi Mark, N8MH
I have seen the pictures of your Landwehr 70 cm preamplifier and I
know very well the model of coax relays used in it.
They are 50 ohm coax relays Tohtsu CX 120 P for printed circuits and can
handle 150 watt pep at 500 MHz with an insertion loss of 0.2 dB and a
crosstallk
