Re: [Elecraft] Upgrading K3 s/n 11xx to operate on the 472KHz

[Edward R Cole]

I used my K3 on 495-502 KHz as an experimental station.  I got 1mw 
output at the XVT Tx output jack running the TEST mode.


For amplifier, I bought a surplus Southern Avionics NDB (aircraft Non 
Directional Beacon) transmitter.  It is a xtal controlled oscillator 
amplified to 100w into 50-ohm load.  25w and 50w NDB's were also 
made.  Check surplus electronic sales for them.  I suspect the supply 
will be small and quickly disappear once discovered by new 630m hams.


Using with the K3, I removed the oscillator ckts and used a 0.1 mfd 
disc ceramic cap to couple from coax to the bandpass filter (single 
slug-tuned coil which feeds a 2N pre-driver (about 10mw 
output).  I disconnected the internal antenna loading coil and 
switched the multi-tapped output coupling coil to 50-ohms.


You will need to build a base loading coil for using a very-short 
vertical antenna (if you have one for 160m, just substitute the loading coil).


630m is brand new ham radio country so prepared to design, modify, 
and build some of your equipment and antennas.  Or wait a year or so 
as small mfr's will likely show up or start up providing gear.


I should have approval by Oct. 15 to start on 472-479 KHz.  I plan to 
use CW/psk31/FT8 as ham modes and run an APRS beacon on 471-KHz as 
WD2XSH/45 under the old ARRL Experimental License.  Many of us are 
looking to run beacons around 471-KHz just outside the new 630m Ham 
Band (only legal if you hold an experimental license).


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] Upgrading K3 s/n 11xx to operate on the 472KHz

[Don Wilhelm]

Jack,

You will need the new synthesizer - two if you have the KRX3.
You will also need the KBPF3A.  If you already have a KBPF3, there is an 
upgrade kit that you can install - the KBPF3MDKT (see K3 Parts and Mod 
Kits).
You will also need the KXV3 (or KXV3A or KXV3B) option in your K3 
because the antenna must connect to the RX ANT IN or XVTR IN.  Transmit 
is on the KXV3 XVTR OUT jack - you will need an amplifier because the 
output is low level (none sold by Elecraft).


73,
Don W3FPR

On 10/1/2017 6:58 PM, Jack Colson wrote:

What needs to be upgraded or added to a stock K3 s/n 11xx to receive/transmit 
on 472KHz?

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[Elecraft] Upgrading K3 s/n 11xx to operate on the 472KHz

[John Harper]

These seem to be popular from what I've been reading lately:

http://www.monitorsensors.com/ham-radio/630m-transverter

-- 

John AE5X
https://ae5x.blogspot.com
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Re: [Elecraft] Upgrading K3 s/n 11xx to operate on the 472KHz

[Mark E. Musick]

Jack,
This should get you started. This is from the KSYN3A FAQ dated February 13,
2015.

8. What is required to use the 600-meter band?a. This band is available
in some countries, often on an experimental basis. Specific restrictions may
apply. A K3 fitted with a KSYN3A, as well as a KXV3 and KBPF3A, can receive
signals on this band, and can put out about 1 milliwatt of transmit power.
An external amplifier will be needed, connected to the XVTR OUT jack. At
present we don't have information on such amplifiers. You can also get on
this band using an upconversion transverter whose output is on a low HF band
(also not presently supplied by Elecraft). For a general introduction to the
600-meter band, see:
http://en.wikipedia.org/wiki/600-meter_amateur_radio_band   
   
9. Can a transverter I.F. of "0" be defined as an alternative to setting
CONFIG:KXV3 to TEST?a. Not at this time, though we hope to add this
capability. Those who frequently alternate between TEST and NOR modes can
assign the KXV3 menu entry to a programmable 
function switch, or write a switch macro to change this menu setting as well
as set up the VFO, preamp, etc., for this band.

*** Here is information provided by Wayne in an e-mail to the reflector on
9/16/2017:

Here's some info to get you started on 630 meters with the K3S or K3. For
receive purposes, either transceiver is fully self-contained. For transmit,
you'll need an external amp of some kind.

RECEIVE

The K3S, or a modified K3, will receive on this band via the XVTR IN jack
(or RX ANT IN). You'll need:

  - A KXV3 transverter interface module (standard with the K3S but optional
for the K3)

  - A KBPF3A filter module, or a KBPF3 with a small mod (see KBPF3MDKT). The
KBPF3A mod kit also comes with a capacitor to be installed on the K3's RF
board to suppress LF noise.

RX performance is quite good on 630 meters. 

Note: The XVTR IN and RX ANT IN jacks work on 630 meters (472 kHz) because
both are post-TR switch. The TR switch has high-pass filtering that rolls
off starting around 1 MHz, so you can't use ANT 1 or ANT 2.

TRANSMIT

You can get a transmit signal out on 630 meters using the XVTR OUT jack
(same requirements as above). Our initial tests shows about 0.5 milliwatts.
In this case you'd use XVTR IN for receive, not RX ANT IN. 

You'll then need an external amplifier. It could be keyed using the rig's
KEY OUT jack. This signal could also be used to control a T/R switch if you
needed to use the same antenna for both transmit and receive. If you use two
different antennas, you'll still have to cut the RX antenna off during TX,
most likely.

Firmware configuration:

To use XVTR IN and OUT on this band, set up the radio for 160 meters, then
set the CONFIG:KXV3 menu entry to TEST. This is necessary because 160 meter
isn't available as a transverter IF selection (yet).

73,
Wayne
N6KR


Mark, WB9CIF 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jack Colson
Sent: Sunday, October 1, 2017 10:59 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Upgrading K3 s/n 11xx to operate on the 472KHz

What needs to be upgraded or added to a stock K3 s/n 11xx to
receive/transmit on 472KHz?
Thank you,
73,
Jack, W3TMZ
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[Elecraft] Upgrading K3 s/n 11xx to operate on the 472KHz

[Jack Colson]

What needs to be upgraded or added to a stock K3 s/n 11xx to receive/transmit 
on 472KHz?
Thank you,
73,
Jack, W3TMZ
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Re: [Elecraft] 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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Re: [Elecraft] 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: [Elecraft] Upgrading K3

[Fred Jensen]

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: [Elecraft] 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: [Elecraft] Upgrading K3

[Mike Harris]

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: [Elecraft] Upgrading K3

[Gmail - George]

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: [Elecraft] 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 
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 
> 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: [Elecraft] Upgrading K3

[Matthew George]

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  
> 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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[Elecraft] 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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[Elecraft] upgrading K3 for very casual user

[brianpepperdine brianpepperdine]

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Re: [Elecraft] Upgrading K3 --- order of installation

[Ron D'Eau Claire]

Yes, it can be tricky (I call it "fiddly"), especially the first time. 

If the connectors are aligned with the KRX3A pc board as seen from above in
Fig 48 in the KRX3A manual, they are properly mated.

73, Ron AC7AC

-Original Message-

Removing the left side panel also makes it much easier to confirm that the
connectors at the rear left of the KRX3 have been mated correctly.
First-time assembly can be a little tricky, but becomes much easier after
the connector pins have settled into their correct alignment.
 
(The same is also true of the front-panel connectors, by the way.)

73 from Ian GM3SEK

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Re: [Elecraft] Upgrading K3 --- order of installation

[Ian White]

Removing the left side panel also makes it much easier to confirm that
the connectors at the rear left of the KRX3 have been mated correctly.
First-time assembly can be a little tricky, but becomes much easier
after the connector pins have settled into their correct alignment.
 
(The same is also true of the front-panel connectors, by the way.)

73 from Ian GM3SEK


>-Original Message-
>From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
>Don Wilhelm
>Sent: 15 July 2016 00:37
>To: Brian F Wruble; Elecraft Reflector
>Subject: Re: [Elecraft] Upgrading K3 --- order of installation
>
>Brian,
>
>Those are in physically different areas of the K3, so I don't think the
>order is significant.
>
>If you have the KRX3 installed, I would suggest adding the KBPF3A first
>(don't forget the added capacitor to the regulator output), and then
>leave the KRX3 assembly out until you have installed the KXV3B.  There
>is no electrical significance to my suggested order, but without the
>KRX3 in place, you will have more "finger room" when installing the
KXV3B.
>
>Hint on the KXV3B - remove the left side panel to give you more access,
>and slightly form the male pins of the KXV3B to the K3 rear before
>trying to insert them into the header.  Put the pins on a flat surface
>and apply a bit of pressure - you only need to bend them a bit.  You
>will understand if you first try to put the pins into the header before
>bending the pins.
>Of course, you could remove the entire rear panel to get the pins to
>align, but that is an extreme solution to the problem.  The slightly
>bent pins will not pose any problem once the KXV3B is fastened in
place.
>
>73,
>Don W3FPR
>
>On 7/14/2016 4:10 PM, Brian F Wruble wrote:
>> When the K3S first came out, I ordered the new synthesizer boards for
my
>K3, and they installed easily and worked great.
>>
>>   I also ordered the KXV3B, KAT3A and the KBPF3A.  I am just now
getting
>ready to install these.  Does anybody have advice on the best order to
install
>them?  Or any cautions, lessons learned, etc.?
>>
>> Tnx.  73 de Brian W3BW
>>
>> Brian F. Wruble, C.F.A.
>> Sent from my iPad Air 2
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>>
>
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Re: [Elecraft] Upgrading K3 --- order of installation

[Richard S. Leary]

Brian,
I just added the KIO3B, KXV3B, and KBPF3A mods. As per W3FPR, Don's advise,
I did the KXV3B first, then the KIO3B, then the KBPF3A. I don't have the
KAT3A, but I do have a K3/100, with ATU, internal 2 mtr xvtr, and the 2nd
receiver.
Had to take off top cover, remove 2 mtr xvtr, 2nd rcvr, then the left side
panel (makes getting to the KXV3B install a lot easier), and then one
section of the bottom cover. None of any of the procedures are any trouble.
Just be careful doing the KBPF3A stuff. I had a couple of SMT's go flying,
but actually got them back. Pretty straight forward. Just be careful, and
read the instructions two steps ahead. Everything worked just fine when it
got put back together. I'm 80, left handed, have bilateral tremors, and
still it's a breeze. Enjoy.

73,
Rick, W7LKG

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian
F Wruble
Sent: Thursday, July 14, 2016 13:10
To: Elecraft Reflector
Subject: [Elecraft] Upgrading K3 --- order of installation

When the K3S first came out, I ordered the new synthesizer boards for my K3,
and they installed easily and worked great. 

 I also ordered the KXV3B, KAT3A and the KBPF3A.  I am just now getting
ready to install these.  Does anybody have advice on the best order to
install them?  Or any cautions, lessons learned, etc.?

Tnx.  73 de Brian W3BW

Brian F. Wruble, C.F.A. 
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Re: [Elecraft] Upgrading K3 --- order of installation

[Don Wilhelm]

Brian,

Those are in physically different areas of the K3, so I don't think the 
order is significant.


If you have the KRX3 installed, I would suggest adding the KBPF3A first 
(don't forget the added capacitor to the regulator output), and then 
leave the KRX3 assembly out until you have installed the KXV3B.  There 
is no electrical significance to my suggested order, but without the 
KRX3 in place, you will have more "finger room" when installing the KXV3B.


Hint on the KXV3B - remove the left side panel to give you more access, 
and slightly form the male pins of the KXV3B to the K3 rear before 
trying to insert them into the header.  Put the pins on a flat surface 
and apply a bit of pressure - you only need to bend them a bit.  You 
will understand if you first try to put the pins into the header before 
bending the pins.
Of course, you could remove the entire rear panel to get the pins to 
align, but that is an extreme solution to the problem.  The slightly 
bent pins will not pose any problem once the KXV3B is fastened in place.


73,
Don W3FPR

On 7/14/2016 4:10 PM, Brian F Wruble wrote:

When the K3S first came out, I ordered the new synthesizer boards for my K3, 
and they installed easily and worked great.

  I also ordered the KXV3B, KAT3A and the KBPF3A.  I am just now getting ready 
to install these.  Does anybody have advice on the best order to install them?  
Or any cautions, lessons learned, etc.?

Tnx.  73 de Brian W3BW

Brian F. Wruble, C.F.A.
Sent from my iPad Air 2
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Re: [Elecraft] Upgrading K3 --- order of installation

[Nr4c]

They're kind of spread out so I don't thinking makes much difference. 

Download the various assembly manuals and see if there are two or more that 
need common panels/parts unassembled and do those at the same time. 

Sent from my iPhone
...nr4c. bill


> On Jul 14, 2016, at 4:10 PM, Brian F Wruble  wrote:
> 
> When the K3S first came out, I ordered the new synthesizer boards for my K3, 
> and they installed easily and worked great. 
> 
> I also ordered the KXV3B, KAT3A and the KBPF3A.  I am just now getting ready 
> to install these.  Does anybody have advice on the best order to install 
> them?  Or any cautions, lessons learned, etc.?
> 
> Tnx.  73 de Brian W3BW
> 
> Brian F. Wruble, C.F.A. 
> Sent from my iPad Air 2
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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[Elecraft] Upgrading K3 --- order of installation

[Brian F Wruble]

When the K3S first came out, I ordered the new synthesizer boards for my K3, 
and they installed easily and worked great. 

 I also ordered the KXV3B, KAT3A and the KBPF3A.  I am just now getting ready 
to install these.  Does anybody have advice on the best order to install them?  
Or any cautions, lessons learned, etc.?

Tnx.  73 de Brian W3BW

Brian F. Wruble, C.F.A. 
Sent from my iPad Air 2
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[Elecraft] Upgrading K3 firmware through the P3

[Alan Bloom]

On Sun, 2010-09-19 at 09:06 -1000, John Buck wrote:
 
 Given a number of reports about trouble downloading the latest K3 and P3 
 firmware, I decided to report my success conditions.

Currently, in order to update K3 firmware with the P3 in line, you first
have to turn off the P3.  That can be done by simply tapping the POWER
switch unless you have the internal power-on jumper set to the always
on position.  In that case you have to remove the power cable to the P3
to turn it off.

If you forget to turn off the P3, then when you try to load K3 firmware
the K3 Utility will give a warning message and you can turn it off at
that time.

The problem occurs if somehow the P3 gets turned back on again after
that.  One way that can happen is if you cycle power to the K3 and the
P3 is getting its power from the K3's auxiliary power output jack.  If
the P3's power-on jumper is set to turn on automatically when power is
applied, then the K3 download process is disrupted which causes the K3
to hang up.  There is now a section in the manual with a step-by-step
procedure to recover from that.

We plan to add a feature to the P3 so that you don't have to turn it off
to upgrade K3 firmware.  It's high on the list.

Alan N1AL


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