Elecraft

Location, location

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Mike Harris

Location, location

G'day,

Might be having to reconfigure the equipment layout. Anyone with
experience of running an Acom 1000 or similar chunky linear with the
transformer side only about 1 foot away from the left hand side of a K3.
That is right hand side of Acom to left hand side of K3. The gap is
currently approximately two feet with no apparent ill effect.

Regards,

Mike VP8NO

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Mike Reublin

Re: Location, location

Hi Mike,

My K3 and the ACOM 1000 are separated by the P3. The K3 is on the left.
They were snuggled up right next to each other before I got the P3 a few
weeks ago.

Zero problems.

73, Mike NF4L

On 9/6/12 5:05 PM, Mike Harris wrote:

> G'day,
>
> Might be having to reconfigure the equipment layout. Anyone with
> experience of running an Acom 1000 or similar chunky linear with the
> transformer side only about 1 foot away from the left hand side of a K3.
> That is right hand side of Acom to left hand side of K3. The gap is
> currently approximately two feet with no apparent ill effect.
>
> Regards,
>
> Mike VP8NO
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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Don Wilhelm-4

Re: Location, location

In reply to this post by Mike Harris

Mike,

That was a problem with the K2 (the AC magnetic field modulated the VFO
magnetic components), but AFAIK, that is not a problem with the K3.

Sometimes old problems get propagated where they should not be - we
might even call those results "weeds".

73,
Don W3FPR

On 9/6/2012 5:05 PM, Mike Harris wrote:

KC6CNN

Re: Location, location

In reply to this post by Mike Reublin

CONTENTS DELETED

The author has deleted this message.

N2TK

Re: Location, location

In reply to this post by Mike Harris

Mike,
I have had each of my K3's tight up against the 2000A, 91B and 87A
(transformer side)without any issues. But I must say at one point I had a
cockpit error when I upgraded the firmware. For some reason the Line-In was
at maximum. I was getting hum on my transmit audio if I was closer than a
several inches from a transformer. Used a piece of steel as a shield that
helped till I figured out what was going on. Reduced the Line-In and
everything has been fine since. Duh!

73,
N2TK, Tony

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Mike Harris
Sent: Thursday, September 06, 2012 5:06 PM
To: [hidden email]
Subject: [Elecraft] Location, location

G'day,

Might be having to reconfigure the equipment layout. Anyone with experience
of running an Acom 1000 or similar chunky linear with the transformer side
only about 1 foot away from the left hand side of a K3.
That is right hand side of Acom to left hand side of K3. The gap is
currently approximately two feet with no apparent ill effect.

Regards,

Mike VP8NO

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Mike Harris

Re: Location, location

In reply to this post by KC6CNN

Good day,

Many thanks to all who replied. It seems I can plan with freedom of
choice. I do have a K2 which probably fuelled my concern over the
potential for hum problems.

Regards,

Mike VP8NO
K2/100 1400
K3/100 0345
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Jim Brown-10

Re: Location, location

In reply to this post by N2TK

On 9/6/2012 4:48 PM, N2TK, Tony wrote:
> For some reason the Line-In was
> at maximum. I was getting hum on my transmit audio

The problem is that the transformers are unshielded (and un-needed, but
that's another discussion), and unshielded transformers are sitting
ducks for magnetic fields. The simplest solution is to roll off the low
end using TXEQ, which is a good move anyway. Most of the what comes
through a mic picking up speech below about 150 Hz is breath pop,
handling noise, and room noise, and nothing below about 400 Hz
contributes to speech intelligibility. So a smart operator will use
TXEQ to kill everything below about 300-400 Hz. TXEQ makes that easy,
and it kills the hum picked up by the transformer.

73, Jim K9YC
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Fabio Mantovani

Re: Location, location

Hi guys,
for the same reason I think that rolling off at least the first TXEQ
band could be a good idea also for AFSK communication, but the TXEQ is
flat in data mode, and not modifiable.

Could this be an useful addition to a new firmware release?

Ciao 73
Fabio
IZ4AFW - NZ1W - HI9/IZ4AFW

Il 07/09/2012 8.06, Jim Brown ha scritto:

> On 9/6/2012 4:48 PM, N2TK, Tony wrote:
>> For some reason the Line-In was
>> at maximum. I was getting hum on my transmit audio
>
> The problem is that the transformers are unshielded (and un-needed, but
> that's another discussion), and unshielded transformers are sitting
> ducks for magnetic fields. The simplest solution is to roll off the low
> end using TXEQ, which is a good move anyway. Most of the what comes
> through a mic picking up speech below about 150 Hz is breath pop,
> handling noise, and room noise, and nothing below about 400 Hz
> contributes to speech intelligibility. So a smart operator will use
> TXEQ to kill everything below about 300-400 Hz. TXEQ makes that easy,
> and it kills the hum picked up by the transformer.
>
> 73, Jim K9YC
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Jim Brown-10

Re: Location, location

On 9/7/2012 1:54 AM, Fabio IZ4AFW / NZ1W wrote:
> for the same reason I think that rolling off at least the first TXEQ
> band could be a good idea also for AFSK communication, but the TXEQ is
> flat in data mode, and not modifiable.

Actually, in AFSK and Data modes are programmed with low frequency
rolloff. Elecraft added this feature several years ago.

73, Jim K9YC
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