K2 and RX Beverage antenna

[Bob Evans-4]

Gary,

I have the RX antenna on both of my K2s.  I actually share the beverage
antenna between the 2 rigs.  If I have both RX antennas turned on, I lose
about 3db on each, but that is no big deal since the signal is way down
anyway and you are simply looking for better signal to noise ration with a
beverage.  I have had no damage to either rig and I have run a KW on 160 and
80 while listening on the alternate radio.  Have fun with it!

Bob K5WA

 

Message: 24

Date: Fri, 10 Nov 2006 22:50:08 -0500

From: "Gary Marks" <[hidden email]>

Subject: [Elecraft] K2 and RX Beverage antenna ?

To: "Elecraft Reflector" <[hidden email]>

Message-ID: <061a01c70544$7df54710$6401a8c0@marksz2ougipy2>

Content-Type: text/plain; charset="iso-8859-1"

I've been thinking of running a Beverage receive antenna to use with my K2
for 160-80m. I've heard that some rigs "front end" have been ruined using
these because the radio's receiver isn't "turned-off" during transmit. I was
wondering if my K2 (#5609) "turns off" the receiver during transmit ?

Gary

WD8ICX

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[Ken Kopp-2]

A word of caution ...

I severely damaged the RX antenna RF stage of my FT-1000D due
to RF coupling from the TX antenna (1KW, 160M) into the RX antenna.
I later measured the induced RF voltage with a 'scope ... it was many
volts.  Some commercial (marine) receivers have lamps in series with
the RX input for protection ... others have pico-fuses.

I realize this situation didn't involve a K2, but I'd be VERY careful.
I've since installed an external RX protection box on both my radios
RX antenna inputs.

Someone mentioned a 47 ohm resistor or an RF choke from the antenna
connector to ground.  I have this arrangement on my open-wire feeders
where they enter the shack.  Dry blowing dust or snow wcan build up a
considerable charge on the antenna and find a path to ground somewhere
....

I mentioned marine receivers above ... Saint Elmo's Fire is a common
event at sea ... when you see your ship's antenns(s) "glowing" in the
dark
you know why those protection lamps are there. (:-))  Bzzzzt!

73! Ken Kopp - K0PP



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