The diodes are not needed in the normal situation where the P3 is
connected to the K3 IF output.
You can use the P3 as a kind of poor ham's spectrum analyzer by going
into the menu and setting Xcvr Sel to the last item in the list,
labeled 0 Hz. Now the frequency displayed is the actual RF
It was mentioned to put a couple of diodes across the P3's input to
protect it. Do the diodes need to be 1n34a's or would 1n4148's be ok for
that application?
I had tried repeatedly to ask Don W3FPR this question off list via
direct email, but I guess all my efforts have ended up in his spam
On 2014-05-19 9:38 AM, Sam Morgan wrote:
It was mentioned to put a couple of diodes across the P3's input to
protect it.
Don't! Back to back diodes will degrade the strong signal handling
of the K3 and the receive inputs already include protection including
gas discharge and a signal level
Sam
I would go with the 1N34a. It is a germanium diode and has a lower forward
voltage drop than a silicon diodethus a lower threshold for protection.
Harlan
NC3C
Sent from my Verizon Wireless 4G LTE DROID
Sam Morgan k5oai@gmail.com wrote:
It was mentioned to put a couple of diodes
Joe,
apples and oranges perhaps?
I think you answered the question as if I was asking about the K3's
input...where as I was asking about the *P3* input which had no gas
discharge protection.
Perhaps I should have mentioned I was speaking of using a standalone P3
for the purpose of chasing
Hi Joe.
I think you could use the 1n148 diodes and they should be OK across the input
of the Elecraft P3. The problem is from larger static voltages that could
destroy the solid state devices in the P3 but with the two diodes back to back
the static voltages should be held to 0.6 volts and
In the lab here at Elecraft we took apart a M-F BNC 50 ohm terminator and put
the back to back diodes inside. When we need to search the building for RF
interference we just add it to the rear of a P3 running on batteries and use it
with a collapsable whip and right angle BNC.
For the
: elecraft@mailman.qth.net elecraft@mailman.qth.net
Subject: Re: [Elecraft] P3 adding rf protection diodes question
In the lab here at Elecraft we took apart a M-F BNC 50 ohm terminator and put
the back to back diodes inside. When we need to search the building for RF
interference we just add
A BNC T with diodes at one female end and the whip on the other would be an
easy choice.
Now on my ROUNTUIT list.
jim ab3cv
On Mon, May 19, 2014 at 12:35 PM, Eric Swartz WA6HHQ - Elecraft
e...@elecraft.com wrote:
In the lab here at Elecraft we took apart a M-F BNC 50 ohm terminator and
put
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