P3TXMON

[Dr. William J. Schmidt, II]

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?

 

 

 

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:  <http://www.VillaGrandPiton.com> www.VillaGrandPiton.com

 

email:   <mailto:[hidden email]> [hidden email]

 

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[Alan Bloom-2]

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/

If you wanted it to switch automatically you could probably modify one
of these boxes with your own relays and decoder circuit, or just build
one from scratch.

There are 8 pins on the connectors.  Power and ground (pins 1 and 3)
don't need to be switched: just wire all in parallel.  VSCL (pin 4) is
not used in the P3 and can be left disconnected.

So for each sensor you'd need one 5PST relay to switch SCALE, SENSE,
VREF, VFWD and VREV (pins 5, 7, 8, 6 and 2 respectively.

Alan N1AL

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[Alan Bloom-2]

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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[Dr. William J. Schmidt, II]

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:  [hidden email]

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Alan
Bloom
Sent: Saturday, August 01, 2015 11:33 PM
To: [hidden email]; [hidden email]
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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[Alan Bloom-2]

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:  [hidden email]
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Alan
> Bloom
> Sent: Saturday, August 01, 2015 11:33 PM
> To: [hidden email]; [hidden email]
> 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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