Re: [Elecraft] K3 sub RX off freq in SSB diversity mode

[Wayne Burdick]

Glad to hear it, Milt. 

73 & Happy Holidays,

Wayne
N6KR


On Dec 22, 2015, at 8:13 PM, Milt -- N5IA  wrote:

> I want to thank everyone who suggested ideas of what the problem source might 
> be.
> 
> Wayne answered with the exact answer.
> 
> I was able to make the trip to my remote site and updated the K3 firmware to 
> the latest version.
> 
> Problem fixed.  The two receivers are on the same frequency when in diversity 
> mode.
> 
> Everyone out there have a great holiday season and a Merry Christmas.
> 
> 73 de Milt, N5IA
> 
> 
> -Original Message- From: Milt -- N5IA
> Sent: Friday, December 11, 2015 12:18 PM
> To: elecraft
> Subject: [Elecraft] K3 sub RX off freq in SSB diversity mode
> 
> I normally don't have much to post here, but today I do have a question.
> 
> I discovered last night that I have the following situation.
> 
> When in SSB mode on 160 Meters and the 2nd RX is turned on, the SSB signals
> are on the same frequency.
> 
> When I invoke the diversity mode, the 2nd RX is receiving at 1.5 kHz higher.
> 
> I tested this on numerous signals and at various frequencies; always the
> same.
> 
> In the CW mode the problem does not exist.  In diversity mode the CW signals
> in both RXs are on the same frequency.
> 
> Anyone with an idea of what is happening here.  I do not remember this
> happening before.  RIT is off.
> 
> I did not try other bands as I normally do not operate on other bands.
> 
> I have searched the archives but have not gotten a hit on anything like
> this.
> 
> Any responses, direct or to the reflector would be appreciated.
> 
> Thanks in advance es 73 for now..
> 
> de Milt, N5IA
> 
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Re: [Elecraft] RFI in audio chain

[Jim Brown]

On Tue,12/22/2015 5:57 PM, Don Wilhelm wrote:
That 30-50 ohms resistance may be a shack safety problem.  Your shack 
ground rod must be connected to the Utility ground rod by a heavy 
conductor (#6 minimum, but #4 preferred). 


Yes. I will again strongly urge Jan to STUDY my tutorial on Power, 
Grounding, and Bonding for ham radio. 
http://k9yc.com/GroundingAndAudio.pdf  If equipment in the shack was 
properly bonded, removing that audio cable would not have solved the 
problem (and there would have been no problem).


73, Jim K9YC


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Re: [Elecraft] K3 sub RX off freq in SSB diversity mode

[Milt -- N5IA]

I want to thank everyone who suggested ideas of what the problem source 
might be.


Wayne answered with the exact answer.

I was able to make the trip to my remote site and updated the K3 firmware to 
the latest version.


Problem fixed.  The two receivers are on the same frequency when in 
diversity mode.


Everyone out there have a great holiday season and a Merry Christmas.

73 de Milt, N5IA


-Original Message- 
From: Milt -- N5IA

Sent: Friday, December 11, 2015 12:18 PM
To: elecraft
Subject: [Elecraft] K3 sub RX off freq in SSB diversity mode

I normally don't have much to post here, but today I do have a question.

I discovered last night that I have the following situation.

When in SSB mode on 160 Meters and the 2nd RX is turned on, the SSB signals
are on the same frequency.

When I invoke the diversity mode, the 2nd RX is receiving at 1.5 kHz higher.

I tested this on numerous signals and at various frequencies; always the
same.

In the CW mode the problem does not exist.  In diversity mode the CW signals
in both RXs are on the same frequency.

Anyone with an idea of what is happening here.  I do not remember this
happening before.  RIT is off.

I did not try other bands as I normally do not operate on other bands.

I have searched the archives but have not gotten a hit on anything like
this.

Any responses, direct or to the reflector would be appreciated.

Thanks in advance es 73 for now..

de Milt, N5IA

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Re: [Elecraft] RFI in audio chain

[Don Wilhelm]

Jan,

That 30-50 ohms resistance may be a shack safety problem.  Your shack 
ground rod must be connected to the Utility ground rod by a heavy 
conductor (#6 minimum, but #4 preferred).


That ground is only for AC safety and some part of lightning protection.
It does not present an effective RF Ground.  To use an example, consider 
an 8 foot connection to that ground and think of a 10 meter signal.  
That 8 foot connection is about 1/4 wavelength, so while the impedance 
at the ground rod may be low, the impedance to 28 MHz RF at the shack 
end is quite high (due to the properties of antennas and transmission 
lines).  In other words, what you are viewing as an 'RF ground' at 10 
meters is instead exactly the opposite, it is a high impedance to RF at 
10 meters.


The proper place to solve RF problems is in the antenna field, and not 
by attempts (sometimes futile) to bond things to a driven ground stake.


73,
Don W3FPR

On 12/22/2015 8:40 PM, Jan Ditzian wrote:



I also discovered that my RF ground point in the shack (back of the 
Ten-Tec KW tuner), shows 30-50 ohms resistance vis-a-vis the 
electrical ground terminals in the shack.  Another rod as part of my 
RF ground system may be forthcoming.




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Re: [Elecraft] RFI in audio chain

[Jan Ditzian]

This is a wrap-up post to the discussion about RFI feedback into the 
audio of my K3.


First, I want to thank everyone who offered suggestions, most of which I 
tried to follow up.


After numerous failures, I managed to lure a local guru--a ham who makes 
his living getting RF and audio things to work.  After ten minutes of BS 
in my ham shack, he said to start disconnecting each wire from the back 
of the K3, one-by-one.  Some of you may have told me to do the same 
thing, and I remember approximating that, but somehow I must have messed 
up.  At any rate, as soon as we disconnected the line from my outboard 
USB sound card to the rear input of K3, used for digital work, the audio 
RFI went away.  My friend says he thinks that an isolated line would be 
better, but the fact that I have a stereo output going directly to the 
mono input is probably the real culprit.  At the moment, only hours 
since his discovery, I have successfully worked on 80 and 40 meters with 
the amplifier, but I have not yet fixed up an isolated digital line.


My thanks to the entire K3 community who attacked this problem.

I am now using the original vertical, fed with patched lengths of 
hardline, with a hardline, wound choke at both ends.  Each choke is 
40-50 feet long.


I also discovered that my RF ground point in the shack (back of the 
Ten-Tec KW tuner), shows 30-50 ohms resistance vis-a-vis the electrical 
ground terminals in the shack.  Another rod as part of my RF ground 
system may be forthcoming.


73,

Jan, KX2A

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[Elecraft] KX3 and Heil Sound PRO 7 Headset

[Timothy S Powell]

Hi,

Can the Heil Sound PRO 7 Headset be used with the KX3?

Thanks.
Timothy
KD4IKY
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Re: [Elecraft] OT National Hearing Test

[Eric Swartz - WA6HHQ, Elecraft]

Since this is more or less OT from our primary areas of discussion and has had a 
lot of postings, lets end the thread at this time.


73,
Eric
List Moderator - Ho, Ho, Ho
/elecraft.com/
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Re: [Elecraft] OT National Hearing Test

[Phil Kane]

On 12/21/2015 7:57 PM, Walter Underwood wrote:

> Yes, this is a legitimate research project and service. Yes, it costs
> $5. I’m putting aside some time to do it myself. I have have some
> pretty nasty tinnitus (ringing in the ears) for the past couple of
> decades. If you don’t have it, count yourself lucky.

You are so right about that.  My wife and I both have tinnitus - hers is
much worse than mine.  I try not to let it interfere with my radio and
music performance activities, and yes, I do use hearing aids - my loss
is hereditary.  I regard the devices as an investment rather than an
expense.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
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Re: [Elecraft] K3 audio response, big roll off observed

[Arie Kleingeld PA3A]

K3 #1255 with all mods: response as flat as a pancake up till 4 kHz.
(line-out into pc-soundcard)

73
Arie PA3A

Op 22-12-2015 om 14:56 schreef Joe Subich, W4TV:



On 12/22/2015 8:48 AM, on4iq wrote:

Listening via 6Khz filter
there is 15k 6k 2.8k installed
I just tried to listen in FM, useless, cut audio off above 3Khz even 
in wide

filter setting
image shows roll off with flat EQ



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Re: [Elecraft] K3 audio response, big roll off observed

[Joe Subich, W4TV]

That looks like an issue with your sound card (6 dB/octave roll-off).
Check with a different sound card/cables.

73,

  ... Joe, W4TV


On 12/22/2015 8:48 AM, on4iq wrote:

Listening via 6Khz filter
there is 15k 6k 2.8k installed
I just tried to listen in FM, useless, cut audio off above 3Khz even in wide
filter setting
image shows roll off with flat EQ






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Re: [Elecraft] K3 audio response, big roll off observed

[on4iq]

Listening via 6Khz filter
there is 15k 6k 2.8k installed
I just tried to listen in FM, useless, cut audio off above 3Khz even in wide
filter setting
image shows roll off with flat EQ


 




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Re: [Elecraft] OT National Hearing Test

[David Glasser]

Well I must say I find the references and the test most enlightening and 
interesting.
Thanks for sharing
David Glasser

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Robert 
Harmon
Sent: Monday, December 21, 2015 9:20 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT National Hearing Test

David,

Are you by any chance in the hearing aid business or affiliated. ?

Take your advertising somewhere else

Bob
K6UJ



On 12/21/15 6:11 PM, David Ahrendts wrote:
> NPRs Ina Jaffe on the National Hearing Test:   
> http://www.npr.org/sections/health-shots/2015/12/21/459397027/is-everybody-mumbling-try-a-hearing-test-you-take-on-the-phone
> This test not unlike most of our “pick the signal out of the noise” 
> experiences.
>
> David A., KC0XT, Los Angeles
>
>
>
> David Ahrendts   davidahren...@me.com
>
>
>
>
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Re: [Elecraft] K3 audio response, big roll off observed

[Mike Harris]

Can't see your dropbox offering. What roofing filter are you listening 
through? Whilst you can set the DSP filter to 4kHz if you are listening 
through a 2.7kHz roofing filter that is what you are going to get.


Regards,

Mike VP8NO

On 22/12/2015 06:26, on4iq wrote:

Hi all,
wonder if anyone can help me out.
K3 audio frequency response in SSB or DATA mode has with flat EQ hughe
rolloff.
on the range 500-4000Hz there is 37dB roll off !

Bandwidth is set to 4KHz.
Any ideas to what might be the cause?
Measured with spectrum labs,
screen dump is to be found here :
https://www.dropbox.com/s/2nd7axi6ic2osd6/Schermafdruk%202015-12-22%2010.24.04.png?dl=0

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[Elecraft] K3 audio response, big roll off observed

[on4iq]

Hi all, 
wonder if anyone can help me out.
K3 audio frequency response in SSB or DATA mode has with flat EQ hughe
rolloff.
on the range 500-4000Hz there is 37dB roll off !

Bandwidth is set to 4KHz.
Any ideas to what might be the cause?
Measured with spectrum labs, 
screen dump is to be found here : 
https://www.dropbox.com/s/2nd7axi6ic2osd6/Schermafdruk%202015-12-22%2010.24.04.png?dl=0




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