[Elecraft] Antenna 2

[john]

My K3S's only have one antenna port so I maybe I do not understand the
issue. Why are you grounding it?

John KK9A



Paul Ormandy paulzl4tt at gmail.com 
Tue Nov 28 17:52:08 EST 2017
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Thanks for the replies. Hadn't thought of its use for sub rx or dummy load.
I have grounded out the connector with a plug hooked directly to the
receiver grounding terminal.

Paul

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Re: [Elecraft] Antenna 2

[Bob McGraw K4TAX]

Either put a small 50 ohm load or leave it open.  A short to ground may cause a 
PA device failure. 

Bob, K4TAX


Sent from my iPhone

> On Nov 28, 2017, at 5:19 PM, Jim Rhodes  wrote:
> 
> Well if you accidentally transmit into it an open might be better than a
> short. Did you at least disable it using the utility program?
> 
> Jim Rhodes
> K0XU
> 
>> On Nov 28, 2017 16:52, "Paul Ormandy"  wrote:
>> 
>> Thanks for the replies. Hadn't thought of its use for sub rx or dummy load.
>> I have grounded out the connector with a plug hooked directly to the
>> receiver grounding terminal.
>> 
>> Paul
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Re: [Elecraft] Antenna 2

[Jim Rhodes]

Well if you accidentally transmit into it an open might be better than a
short. Did you at least disable it using the utility program?

Jim Rhodes
K0XU

On Nov 28, 2017 16:52, "Paul Ormandy"  wrote:

> Thanks for the replies. Hadn't thought of its use for sub rx or dummy load.
> I have grounded out the connector with a plug hooked directly to the
> receiver grounding terminal.
>
> Paul
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[Elecraft] Antenna 2

[Paul Ormandy]

Thanks for the replies. Hadn't thought of its use for sub rx or dummy load.
I have grounded out the connector with a plug hooked directly to the
receiver grounding terminal.

Paul
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[Elecraft] Antenna 2

[Rose]

I have my Antenna 2 jack permanently connected to
the input of my K3 2nd receiver, which normally is
parked on 6M.

The Antenna 2 jack is permanently connected to a 6M
vertical, allowing me to be aware of any 6M openings
while going about the my usual HF operatings.

FWIW ...

73!

Ken Kopp - K0PP
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Re: [Elecraft] Antenna 2

[Gary Smith]

I think he was asking what Don answered 
to.

Gary
KA1J

> 
> That doesn't explain how he expects the rig to short out the port for
> Ant 2 . .. WHEN IT HAS BEEN SELECTED ... just because there is no
> actual antenna connected to it.  I don't get the reasoning behind the
> original query.
> 
> Dave   AB7E
> 
> 
> On 11/28/2017 7:04 AM, K9ZTV wrote:
> > We hook dummy loads to ANT 2 on all our K3s during FD to prevent
> > inadvertent transmissions when no antenna is connected to it.  The
> > ATU TUNE button is immediately above the ANT button and
> > fat-fingered/far-sighted ops unfamiliar with the K3 have been known
> > to hit the wrong one, especially on the higher bands where the noise
> > floor makes it difficult to detect the absence of an antenna.
> >
> > 73,
> >
> > Kent  K9ZTV
> >
> >
> >
> >> On Nov 28, 2017, at 7:40 AM, David Gilbert
> >>  wrote:
> >>
> >>
> >> If you selected Ant 2 it wouldn't have been "unused".   How is the
> >> rig supposed to know you don't have anything physically connected
> >> to that port?
> >>
> >> Dave   AB7E
> >
> 
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Re: [Elecraft] Antenna 2

[Michael Eberle]

I believe he is actually operating into an antenna on Ant1 port. He 
switched to Ant2 to check the port isolation and would obviously switch 
back to Ant1 to operate.  I doubt grounding the non-selected antenna 
port would make any difference on TX and some use both ports for 
diversity RX.  If protecting the radio is the concern then I believe as 
Kent stated, the dummy load would be the best option.


Mike  KI0HA


On 11/28/2017 12:01, David Gilbert wrote:


That doesn't explain how he expects the rig to short out the port for 
Ant 2 . .. WHEN IT HAS BEEN SELECTED ... just because there is no 
actual antenna connected to it.  I don't get the reasoning behind the 
original query.


Dave   AB7E


On 11/28/2017 7:04 AM, K9ZTV wrote:
We hook dummy loads to ANT 2 on all our K3s during FD to prevent 
inadvertent transmissions when no antenna is connected to it.  The 
ATU TUNE button is immediately above the ANT button and 
fat-fingered/far-sighted ops unfamiliar with the K3 have been known 
to hit the wrong one, especially on the higher bands where the noise 
floor makes it difficult to detect the absence of an antenna.


73,

Kent  K9ZTV



On Nov 28, 2017, at 7:40 AM, David Gilbert 
 wrote:



If you selected Ant 2 it wouldn't have been "unused".   How is the 
rig supposed to know you don't have anything physically connected to 
that port?


Dave   AB7E




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Re: [Elecraft] Antenna 2

[David Gilbert]

That doesn't explain how he expects the rig to short out the port for 
Ant 2 . .. WHEN IT HAS BEEN SELECTED ... just because there is no actual 
antenna connected to it.  I don't get the reasoning behind the original 
query.


Dave   AB7E


On 11/28/2017 7:04 AM, K9ZTV wrote:

We hook dummy loads to ANT 2 on all our K3s during FD to prevent inadvertent 
transmissions when no antenna is connected to it.  The ATU TUNE button is 
immediately above the ANT button and fat-fingered/far-sighted ops unfamiliar 
with the K3 have been known to hit the wrong one, especially on the higher 
bands where the noise floor makes it difficult to detect the absence of an 
antenna.

73,

Kent  K9ZTV




On Nov 28, 2017, at 7:40 AM, David Gilbert  wrote:


If you selected Ant 2 it wouldn't have been "unused".   How is the rig supposed 
to know you don't have anything physically connected to that port?

Dave   AB7E




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Re: [Elecraft] Antenna 2

[KENT TRIMBLE]

We hook dummy loads to ANT 2 on all our K3s during FD to prevent 
inadvertent transmissions when no antenna is connected to it.


The ATU TUNE button is immediately above the ANT button and 
fat-fingered/far-sighted ops unfamiliar with the K3 have been known to 
hit the wrong one, especially on the higher bands where the noise floor 
sometimes makes it difficult to detect the absence of an antenna.


73,

Kent   K9ZTV
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Re: [Elecraft] Antenna 2

[Walter Underwood]

I keep my dummy load connected to ANT 2 on my KXPA100. Might as well have it 
connected somewhere.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Nov 28, 2017, at 6:22 AM, Don Wilhelm  wrote:
> 
> Paul,
> 
> There is some stray coupling between ANT1 and ANT2, but no direct path.
> The unused antenna is not grounded.  One reason is that it can be used to 
> feed the subRX AUX ANT input when using diversity.
> 
> 73,
> Don W3FPR
> 
> On 11/28/2017 2:36 AM, Paul Ormandy wrote:
>> Hi all,
>> When messing around today with antennas, I had my aerial connected only 
>> to
>> Ant 1 and discovered that when selected, Ant 2 was capable of receiving
>> signals with no antenna connected to it, albeit at a much reduced 
>> signal. I would have thought the unused
>> port would have been earthed out??
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Re: [Elecraft] Antenna 2

[Don Wilhelm]

Paul,

There is some stray coupling between ANT1 and ANT2, but no direct path.
The unused antenna is not grounded.  One reason is that it can be used 
to feed the subRX AUX ANT input when using diversity.


73,
Don W3FPR

On 11/28/2017 2:36 AM, Paul Ormandy wrote:

Hi all,

     When messing around today with antennas, I had my aerial connected 
only to
     Ant 1 and discovered that when selected, Ant 2 was capable of 
receiving
     signals with no antenna connected to it, albeit at a much reduced 
signal. I would have thought the unused

     port would have been earthed out??

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Re: [Elecraft] Antenna 2

[Bob N3MNT]

If you do not have anything on Ant 2 I suggest using the config utility to
disable Ant 2 for now.  This will prevent accidentally selecting Ant 2 and
trying to transmit.  



--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] Antenna 2

[David Gilbert]

If you selected Ant 2 it wouldn't have been "unused".   How is the rig 
supposed to know you don't have anything physically connected to that port?


Dave   AB7E


On 11/28/2017 12:36 AM, Paul Ormandy wrote:

Hi all,

    When messing around today with antennas, I had my aerial connected 
only to
    Ant 1 and discovered that when selected, Ant 2 was capable of 
receiving
    signals with no antenna connected to it, albeit at a much reduced 
signal. I would have thought the unused

    port would have been earthed out??
    Paul



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[Elecraft] Antenna 2

[Paul Ormandy]

Hi all,

    When messing around today with antennas, I had my aerial connected only to
Ant 1 and discovered that when selected, Ant 2 was capable of receiving
signals with no antenna connected to it, albeit at a much reduced signal. I 
would have thought the unused
port would have been earthed out??
Paul
   


--
Paul Ormandy
ZL4TT

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