Now this has me wondering about having my 2 meter and 6 meter antennas in close
proximity.
From: Edward R Cole
To: Elecraft@mailman.qth.net
Sent: Wednesday, January 28, 2015 4:44 PM
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
Semi-related topic
Semi-related topic:
Recently, I was hosting a local 2m-SSB net and had my KX3-2M
connected to a 7-element yagi pointed 90-degrees from the
transmitting antenna array (K3+xvtr+150w amp). Spacing is about
40-feet horizontally and 30-feet vertically (Tx ant higher). Its
normal to run the Pream
If the 2nd rx pre-amp can add sufficient gain, then a resistive divider on
that input will add a good degree of protection. Receive-only aerials often
have their own pre-amps, so there might be plenty of gain in hand. Coax to
the 2nd rx should still be protected against common mode current.
Folks,
Have we lost track of our senses? (I never vent so please allow me to do so..)
I like to “trade a lot" and see many radios that have a blown out front end,
which usually I can fix.
Most times the victim radio was “on receive” with a shiny new transmitter that
was “just being set in pl
...@embarqmail.com]
Sent: 28 January 2015 13:41
To: Doug Turnbull; 'Lyle Johnson'; 'Elecraft Reflector'
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
Doug,
Not necessarily - the K3 RX antenna input can be exposed to RF from the
TX antenna whether that is the K3 tra
> On Jan 28, 2015, at 7:45 AM, Doug Turnbull wrote:
>
> Lyle and company,
> To be clear are you talking about using another transmitter other than
> the K3's transmitter and external amplifier? This is my reading and I am
> just checking. Thank you.
Both. I believe the OP asked about
Doug,
Not necessarily - the K3 RX antenna input can be exposed to RF from the
TX antenna whether that is the K3 transmitting or another transmitter.
In the case of another transmitter, one can add the exposure to the K3
normal ANT1 or ANT2 input if an antenna is connected.
73,
Don W3FPR
On 1
-boun...@mailman.qth.net] On Behalf Of Lyle
Johnson
Sent: 27 January 2015 23:45
To: Elecraft Reflector
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
In general, ensure the coupled energy into the receiver antenna
connector is less than 1 watt under absolute worst case conditions
Thank you
Sounds like that may be my solution
From: "d...@lightstream.net"
To: elecraft@mailman.qth.net
Sent: Tuesday, January 27, 2015 9:11 PM
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
I've been using the Array Solutions device (AS-RX
I've been using the Array Solutions device (AS-RXFEP) for over a year on
my K3. I have a homebrew magnetic loop connected to the K3 sub rx, with
the loop located about 15 feet from the transmitting ground plane (about
6' above ground). Prior to installing the AS-RXFEP, the sub rx COR would
be trigg
Thank you
From: Lyle Johnson
To: Elecraft Reflector
Sent: Tuesday, January 27, 2015 6:45 PM
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
In general, ensure the coupled energy into the receiver antenna
connector is less than 1 watt under absolute worst
In general, ensure the coupled energy into the receiver antenna
connector is less than 1 watt under absolute worst case conditions,
and preferably under 100 mW, and your receiver should be OK.
Put another way, the antennas should be separated by 40 dB if running
up to 1 kW, 30 dB if running
In general, ensure the coupled energy into the receiver antenna
connector is less than 1 watt under absolute worst case conditions, and
preferably under 100 mW, and your receiver should be OK.
Put another way, the antennas should be separated by 40 dB if running up
to 1 kW, 30 dB if running up
Ken,
I am not Wayne, but I can tell you that you question does not have a
single answer.
Do you run an amplifier? More power requires greater separation between
the TX and the RX antennas.
Another factor is the orientation of the antennas. An RX antenna in the
null pattern of the TX antenn
Yesplease Wayne.
Sent from my Verizon Wireless 4G LTE smartphone
Original message From: Ken
Date:01/27/2015 5:53 PM (GMT-05:00) To: Wayne Burdick
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Sub Receiver
and protecting the Sub RX input
Wayne, can you please
Wayne, can you please elaborate on what is sufficient antenna separation when
a transmitter is operating on another antenna? I ask this because my K3
returning from a trip to Elecraft after damaging the front end. I assume it
happened when I was testing an old boat anchor (Viking II, 100 w
Phil,
The K3 ANT1 and ANT2 connections are not of concern, they are protected
by the T/R circuits in the K3.
The AUX ant is protected by a COR (Carrier Operated Relay) that will
activate if there is too much RF being brought in by the AUX antenna.
While it should protect the K3 (and KRX3) f
Perhaps you could clarify protection on RX inputs. I have the KRX3 and
run the internal 100 watt amp.
Sometimes I share the same antenna with TX, ANT 1 or ANT2. I assumed
there that the RX is protected.
Sometimes I use the AUX antenna for diversity receive. Is that input not
protected? When doe
This would only be necessary if you're running high power and/or the antenna to
be used with the KRX3 is close to the transmit antenna. Could you describe your
antenna system?
Wayne
N6KR
http://www.elecraft.com
> On Jan 27, 2015, at 7:12 AM, Harry Yingst via Elecraft
> wrote:
>
> I ord
An alternative to a relay (which should ground the sub-receiver ant)
is using a pin diode to short the input.
Typically one uses a coupling capacitor to isolate the antenna from
the circuit which will have a low value of dc bias to turn on the pin
diode which will conduct to ground and short t
There are a couple of things to think about. How much power are you running?
How close is the receive antenna to your transmitting antenna? Does your
receive only antenna possibly have an interface that can connect to the key
out of the K3? (My Pixel Loop antenna has such a device)
You can also tr
I ordered the sub receiver and in the conversation with Elecraft I was informed
that it is good idea to build a device that would short the dedicated RX
antenna to ground to protect it during transmit.
The simple way would be a relay but I'd rather not hear a relay click with each
transmission.
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