Upgrading K3

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Upgrading K3

Christopher Soames
Hi I am looking to upgrade my K3 with a sun receiver, to do this am I
correct in assuming that the new part will come as per K3S spec? if this
is the case do I then have too upgrade the existing with the new K3S
synthesiser card also?

What else do I then need?
regards
G0TZZ
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Re: Upgrading K3

ng7m
I assume you mean sub receiver?  If so, yes you will need two of the new synthesizers.  It's all in the FAQ from 2015 located here on the elecraft website: http://www.elecraft.com/manual/KSYN3A%20FAQ-ver-C-2.pdf

Well worth the upgrade by the way!

Mg NG7M

--
Matthew George
801-560-8754

> On Jun 23, 2017, at 1:59 PM, Christopher Soames <[hidden email]> wrote:
>
> Hi I am looking to upgrade my K3 with a sun receiver, to do this am I correct in assuming that the new part will come as per K3S spec? if this is the case do I then have too upgrade the existing with the new K3S synthesiser card also?
>
> What else do I then need?
> regards
> G0TZZ
> ______________________________________________________________
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Re: Upgrading K3

David Bunte
Chris -

The new sub receiver comes with the new synthesizer, so you will only need
to replace the one in your main receiver, if you have not already done
that. The synthesizers must both be the same.

73 de Dave - K9FN

On Fri, Jun 23, 2017 at 4:08 PM, Matthew George <[hidden email]>
wrote:

> I assume you mean sub receiver?  If so, yes you will need two of the new
> synthesizers.  It's all in the FAQ from 2015 located here on the elecraft
> website: http://www.elecraft.com/manual/KSYN3A%20FAQ-ver-C-2.pdf
>
> Well worth the upgrade by the way!
>
> Mg NG7M
>
> --
> Matthew George
> 801-560-8754
>
> > On Jun 23, 2017, at 1:59 PM, Christopher Soames <[hidden email]>
> wrote:
> >
> > Hi I am looking to upgrade my K3 with a sun receiver, to do this am I
> correct in assuming that the new part will come as per K3S spec? if this is
> the case do I then have too upgrade the existing with the new K3S
> synthesiser card also?
> >
> > What else do I then need?
> > regards
> > G0TZZ
> > ______________________________________________________________
> > 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
> > Message delivered to [hidden email]
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Re: Upgrading K3

Gmail - George
In reply to this post by Christopher Soames
Christopher,
Many of us who have upgraded have extra old style synthesizers with no plans
for them.

If the cost of upgrading your main synthesizer is stopping you from getting
a sub-receiver, I and many others would be glad to loan or give you an old
style one.

In the long run a sub-receive with new style synthesizers is the way to go;
but maybe the budget would rather go in 2 steps rather than all at once.

The above assumes the new sub-receiver will operate with the old style
synthesizer!

73
George
AI4VZ

-----Original Message-----
From: Christopher Soames
... if this is the case do I then have too upgrade the existing with the new
K3S
synthesiser card also?

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Re: Upgrading K3

Mike Harris-9
An interesting question is just what is the difference between the KRX3
and the KRX3A.

Regards,

Mike VP8NO

On 23/06/2017 17:57, Gmail - George wrote:
> The above assumes the new sub-receiver will operate with the old style
> synthesizer!
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Re: Upgrading K3

Don Wilhelm
Mike,

The KRX3A includes the 220uF Solid Polymer Electrolytic Capacitor on the
output of the 8 volt regulator.
As far as I know, there is no other difference.  This capacitor allows
extension of the K3 tuning range (with the modified KBPF3 option) to
100kHz.  See
http://www.elecraft.com/manual/E740264%20KBPF3%20Modification%20Kit%20Instructions%20Rev%20A2.pdf
If you have a KRX3 and KBPF3 to modify.

73,
Don W3FPR

On 6/23/2017 5:44 PM, Mike Harris wrote:
> An interesting question is just what is the difference between the KRX3
> and the KRX3A.
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Re: Upgrading K3

k6dgw
OK Don, I'll bite:  What does a "220uF Solid Polymer Electrolytic
Capacitor on the output of the 8 volt regulator" have to do with an
"extension of the K3 tuning range to 100 KHz?"  Voltage regulators are
usually found at the far end of the circuit from frequency determining
components.  Enquiring minds would like to know. [:-)

73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

On 6/23/2017 3:21 PM, Don Wilhelm wrote:

> Mike,
>
> The KRX3A includes the 220uF Solid Polymer Electrolytic Capacitor on
> the output of the 8 volt regulator.
> As far as I know, there is no other difference.  This capacitor allows
> extension of the K3 tuning range (with the modified KBPF3 option) to
> 100kHz.  See
> http://www.elecraft.com/manual/E740264%20KBPF3%20Modification%20Kit%20Instructions%20Rev%20A2.pdf
> If you have a KRX3 and KBPF3 to modify.
>
> 73,
> Don W3FPR

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Re: Upgrading K3

Don Wilhelm
I believe it has to do with reducing low frequency noise on the 8 volt line.

The addition of the capacitor was mentioned by Eric at the FDIM when the
K3S was introduced.

The new synthesizers made that lower frequency operation possible, and I
assume that during testing, the noise was noticed.

73,
Don W3FPR

On 6/23/2017 7:38 PM, Fred Jensen wrote:
> OK Don, I'll bite:  What does a "220uF Solid Polymer Electrolytic
> Capacitor on the output of the 8 volt regulator" have to do with an
> "extension of the K3 tuning range to 100 KHz?"  Voltage regulators are
> usually found at the far end of the circuit from frequency determining
> components.  Enquiring minds would like to know. [:-)
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Re: Upgrading K3

Victor Rosenthal 4X6GP
Wouldn't the new subrx also have to have the extra preamp to match the
one in the KXV3B?

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 24 Jun 2017 02:54, Don Wilhelm wrote:

> I believe it has to do with reducing low frequency noise on the 8 volt
> line.
>
> The addition of the capacitor was mentioned by Eric at the FDIM when the
> K3S was introduced.
>
> The new synthesizers made that lower frequency operation possible, and I
> assume that during testing, the noise was noticed.
>
> 73,
> Don W3FPR
>
> On 6/23/2017 7:38 PM, Fred Jensen wrote:
>> OK Don, I'll bite:  What does a "220uF Solid Polymer Electrolytic
>> Capacitor on the output of the 8 volt regulator" have to do with an
>> "extension of the K3 tuning range to 100 KHz?"  Voltage regulators are
>> usually found at the far end of the circuit from frequency determining
>> components.  Enquiring minds would like to know. [:-)
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