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Impact of this mod: K3 I.F. Output Buffer Gain Modification???

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WE5ST

Impact of this mod: K3 I.F. Output Buffer Gain Modification???

Can someone explain the real world value of making this modification? This mod
is listed on the Elecraft website with this description (new production
incorporates this mod):

This modification increases the signal level at the I.F. output by more than 10
dB. It requires changing one
easily-accessible resistor on the K3’s main RF board with either another surface
mount device (SMD) or a leaded
1/8 watt resistor.
I have s/n #3012 and expect my radio was pre-modification. I will be adding
filters and other mods after the first of the year and want to make this is one
time affair if possible.

Merry Christmas!
Jack - WE5ST
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Jack - WE5ST

Matt Zilmer

Re: Impact of this mod: K3 I.F. Output Buffer GainModification???

The main value is bringing the IF output up to a level that is usable
by the P3.

I thought that the mod was in all K3's after s/n 3600-something or
other, but there are probably experts around (or Elecraft crew) that
know the exact cut-in s/n or date.

73,
matt W6NIA

On Fri, 23 Dec 2011 09:05:22 -0800 (PST), you wrote:

>Can someone explain the real world value of making this modification? This mod
>is listed on the Elecraft website with this description (new production
>incorporates this mod):
>
>This modification increases the signal level at the I.F. output by more than 10
>dB. It requires changing one
>easily-accessible resistor on the K3s main RF board with either another surface
>mount device (SMD) or a leaded
>1/8 watt resistor.
>I have s/n #3012 and expect my radio was pre-modification. I will be adding
>filters and other mods after the first of the year and want to make this is one
>time affair if possible.
>
>Merry Christmas!
>Jack - WE5ST
>______________________________________________________________
>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

______________________________________________________________
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Mike Reublin

Re: Impact of this mod: K3 I.F. Output Buffer GainModification???

I'd be interested in knowing also.

73, Mike NF4L

On 12/23/2011 12:15 PM, Matt Zilmer wrote:

WE5ST

Re: Impact of this mod: K3 I.F. Output Buffer GainModification???

In reply to this post by Matt Zilmer

Exactly what I needed to know. I do plan to add the P3.

Thanks!
Jack - WE5ST

________________________________
From: Matt Zilmer <[hidden email]>
To: Jack Berry <[hidden email]>
Cc: [hidden email]
Sent: Fri, December 23, 2011 11:15:39 AM
Subject: Re: [Elecraft] Impact of this mod: K3 I.F. Output Buffer
GainModification???

The main value is bringing the IF output up to a level that is usable
by the P3.

I thought that the mod was in all K3's after s/n 3600-something or
other, but there are probably experts around (or Elecraft crew) that
know the exact cut-in s/n or date.

73,
matt W6NIA

On Fri, 23 Dec 2011 09:05:22 -0800 (PST), you wrote:

>Can someone explain the real world value of making this modification? This mod
>is listed on the Elecraft website with this description (new production
>incorporates this mod):
>
>This modification increases the signal level at the I.F. output by more than 10

>dB. It requires changing one
>easily-accessible resistor on the K3’s main RF board with either another surface
>
>mount device (SMD) or a leaded
>1/8 watt resistor.
>I have s/n #3012 and expect my radio was pre-modification. I will be adding
>filters and other mods after the first of the year and want to make this is one

>time affair if possible.
>
>Merry Christmas!
>Jack - WE5ST
>______________________________________________________________
>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

Jack - WE5ST

Iain MacDonnell - N6ML-2

Re: Impact of this mod: K3 I.F. Output Buffer GainModification???

In reply to this post by Mike Reublin

The app note says that the mod is incorporated into all new K3's since
September 2009.

Without it, the P3 (or other panadapters) should still function, but
some weak signals may be undetectable due to the noise floor of the IF
being below that of the panadapter.

~iain / N6ML

On Fri, Dec 23, 2011 at 10:22 AM, Mike <[hidden email]> wrote:

> I'd be interested in knowing also.
>
> 73, Mike NF4L
>
> On 12/23/2011 12:15 PM, Matt Zilmer wrote:
>> The main value is bringing the IF output up to a level that is usable
>> by the P3.
>>
>> I thought that the mod was in all K3's after s/n 3600-something or
>> other, but there are probably experts around (or Elecraft crew) that
>> know the exact cut-in s/n or date.
>>
>> 73,
>> matt W6NIA
>>
>> On Fri, 23 Dec 2011 09:05:22 -0800 (PST), you wrote:
>>
>>> Can someone explain the real world value of making this modification? This mod
>>> is listed on the Elecraft website with this description (new production
>>> incorporates this mod):
>>>
>>> This modification increases the signal level at the I.F. output by more than 10
>>> dB. It requires changing one
>>> easily-accessible resistor on the K3’s main RF board with either another surface
>>> mount device (SMD) or a leaded
>>> 1/8 watt resistor.
>>> I have s/n #3012 and expect my radio was pre-modification. I will be adding
>>> filters and other mods after the first of the year and want to make this is one
>>> time affair if possible.
>>>
>>> Merry Christmas!
>>> Jack - WE5ST
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html

Alan Bloom

Re: Impact of this mod: K3 I.F. Output Buffer GainModification???

In reply to this post by Matt Zilmer

The P3 is usable without the mod but it increases the sensitivity of the
P3 display. On the low bands you probably won't notice any difference
but if you do much 10 or 6 meter operating you probably want to make
sure the modification has been done.

I'm not sure of the serial number of the changeover, but the web site
says "RF board Rev H3 and later" have the new resistor value.

Alan N1AL

On Fri, 2011-12-23 at 09:15 -0800, Matt Zilmer wrote:

> The main value is bringing the IF output up to a level that is usable
> by the P3.
>
> I thought that the mod was in all K3's after s/n 3600-something or
> other, but there are probably experts around (or Elecraft crew) that
> know the exact cut-in s/n or date.
>
> 73,
> matt W6NIA
>
> On Fri, 23 Dec 2011 09:05:22 -0800 (PST), you wrote:
>
> >Can someone explain the real world value of making this modification? This mod
> >is listed on the Elecraft website with this description (new production
> >incorporates this mod):
> >
> >This modification increases the signal level at the I.F. output by more than 10
> >dB. It requires changing one
> >easily-accessible resistor on the K3’s main RF board with either another surface
> >mount device (SMD) or a leaded
> >1/8 watt resistor.
> >I have s/n #3012 and expect my radio was pre-modification. I will be adding
> >filters and other mods after the first of the year and want to make this is one
> >time affair if possible.
> >
> >Merry Christmas!
> >Jack - WE5ST
> >______________________________________________________________
> >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
> ______________________________________________________________
> 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
>