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Antenna 2

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Paul Ormandy

Antenna 2

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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David Gilbert

Re: Antenna 2

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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Bob N3MNT

Re: Antenna 2

In reply to this post by Paul Ormandy

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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Don Wilhelm

Re: Antenna 2

In reply to this post by Paul Ormandy

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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KENT TRIMBLE

Re: Antenna 2

In reply to this post by Paul Ormandy

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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David Gilbert

Re: Antenna 2

In reply to this post by 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 <[hidden email]> 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
>

Michael Eberle

Re: Antenna 2

In reply to this post by David Gilbert

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
>>> <[hidden email]> 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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Gary Smith-2

Re: Antenna 2

In reply to this post by David Gilbert

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
> >> <[hidden email]> 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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>
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