Thanks. Be sure to let us know what you come up with.
Alan
On 08/01/2015 11:09 PM, Dr. William J. Schmidt, II wrote:
I'm working on something that is a little more 21st century-ish... something
that is auto switching basis a little programming... about $20 worth of
stuff and it's god to go.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
Owner - Operator
Big Signal Ranch - K9ZC
Staunton, Illinois
Owner - Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
email: b...@wjschmidt.com
-----Original Message-----
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Alan
Bloom
Sent: Saturday, August 01, 2015 11:33 PM
To: elecraft@mailman.qth.net; elecraft...@yahoogroups.com
Subject: [Elecraft] Multiple sensors with P3 transmit monitor
On 07/25/2015 07:11 PM, Alan Bloom wrote:
On 07/25/2015 01:01 PM, Dr. William J. Schmidt, II wrote:
I suppose the next thing we'll need is an outboard box to switch 3 P3TX
sensors automatically keyed off the ACC connector (amp off HF, amp on
HF, 2 meter). Hmmmm. I wonder if anyone else has thought about this?
You can buy manual RJ-45 switches on Amazon. I just ordered one to try
out. 10 bucks plus shipping:
http://www.amazon.com/Network-Output-Manual-Sharing-Switch/dp/B00AUB3SSA/
This is a little box that has 4 pushbutton switches on the front that
select one of four one RJ-45 connectors. I received the unit a few days
ago and finally got around to trying it. It is quite small - about 4.7
x 3.3 x 1.1 inches (11.9 x 8.4 x 2.8 cm).
I have it connected with short Ethernet LAN cables to three sensors:
200W HF, 2000W HF and VHF. The fourth position is "off". It makes it
quick and easy to select and de-select sensors for my testing. The P3
TX monitor automatically senses which type of sensor is connected and
changes scale factors and calibration values as required.
I took it apart to examine the innards. Each of the four pushbuttons is
ganged to two 4PST switches, so all 8 lines of the RJ-45 connectors are
switched. It appears well-constructed with a good-quality PC board.
The chassis is thin sheet metal, but perfectly adequate for the purpose.
One odd feature is that the pushbuttons are labeled D through A, left
to right. They did that so the connectors on the rear panel come out in
the more-logical A-D order.
By the way, it should also work fine with a W2 if you want to be able to
use more than two sensors.
Alan N1AL
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