Re: [Elecraft] KRX3 Mod

[Dennis W1UE]

That answers my question.  The KBPF3 is not being installed into the
sub-receiver,
and the K3S already has the part installed on the main RF board.  So, no
mod is needed.

Thanks!

Dennis W1UE


On Sun, Jun 13, 2021 at 7:26 AM w4sc  wrote:

> The mod information is in the KBPF3A installation instructions.  It only
> required if you have a KBPF3A installed and want to RX VLF (i.e. 630M)
>
>
>
> Microsoft Word - E740265 KBPF3A Option Installation Rev A1.doc
> (elecraft.com)
> 
>
>
>
> de Ben W4SC
>
>
>
> Sent from Mail  for
> Windows 10
>
>
>
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[Elecraft] KRX3 Mod

[w4sc]

The mod information is in the KBPF3A installation instructions.  It only 
required if you have a KBPF3A installed and want to RX VLF (i.e. 630M)

Microsoft Word - E740265 KBPF3A Option Installation Rev A1.doc (elecraft.com)

de Ben W4SC 

Sent from Mail for Windows 10

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[Elecraft] KRX3 Mod

[Dennis W1UE]

I inquired yesterday about putting a KRX3 2nd receiver into a K3S radio.  I
was told yes, it will work, but there is a mod to essentially make it a
KRX3A 2nd receiver.  The mod consisted of adding a 270uF cap, but no
further details past that.

Where does that cap go in the circuit?

Dennis W1UE
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[Elecraft] KRX3 into a K3S

[Dennis W1UE]

I've had a K3 with a KRX3 for quite a while.  I recently purchased a K3S.

Can I put the KRX3 into a K3S, or must I use a KRX3A for a K3S?

I upgraded the K3 to the new synthesizers several years ago, so if that's a
constraint I already have the new synthesizer.

Any other considerations that I'm missing?

Dennis W1UE
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Re: [Elecraft] KRX3 TMP Connectors

[Victor Rosenthal]

You don't need a lot of strength to do it! If it doesn't go in, probably 
the tip isn't going into the socket.  Check to see that  the tip is 
parallel to the shield portion of the connector. Make sure you are 
putting it in straight. Don't try to force it -- when you have it lined 
up right, it should go in.

Good luck.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
.

On 19/09/2020 18:57, Bob DeHaney wrote:

I removed my KRX3 to install a new filter.  My problem is, I can't
re-insert one of the TMP connectors. It simply doesn't seat.  I've
inspected the Tip and it looks OK.

I'm 80 and don't have super hand strength, but the first connector
went in normally.

Any suggestions?



Vy 73 de Bob DJ0RD/WU5T



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[Elecraft] KRX3 TMP Connectors

[Bob DeHaney]

I removed my KRX3 to install a new filter.  My problem is, I can't re-insert 
one of the TMP connectors. It simply doesn't seat.  I've inspected the Tip and 
it looks OK.

I'm 80 and don't have super hand strength, but the first connector went in 
normally.

Any suggestions?

 

Vy 73 de Bob DJ0RD/WU5T

 

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[Elecraft] KRX3

[Donald Schliesser]

Looking for a KRX3 2nd RX for my K3. Please reply off list.

 TU, Donald K6RV

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[Elecraft] KRX3 & K144XV question

[Alan Muldawer]

I have a K3 with the second receiver KRX3 and I also have the internal 2
meter card K144XV and what I would like to do is to be on 6 meter, VFO A
and to listen to 2 meters on VFO B . I have had no luck! It looks like in
the information for K144XV it seems that this is possible :  "If you have a
KRX3 sub receiver installed, you can tune HF-6 meters with the sub while
operating on 2 meters with the main receiver/transmitter. "
http://www.elecraft.com/manual/K144XV%20Data%20Sheet%20rev%204sm.pdf
I have separate antennas for both bands. The 6 meter antenna is on #2 and
the 2 meter antenna is on #3.
Has anyone been able to do this and how. Thanks!
73 Alan N3ALN
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Re: [Elecraft] KRX3 & K144XV question

[Don Wilhelm]

Alan,

Set the Config menu VFO IND to YES.

73,
Don W3FPR

On 12/7/2015 3:58 PM, Alan Muldawer wrote:

I have a K3 with the second receiver KRX3 and I also have the internal 2
meter card K144XV and what I would like to do is to be on 6 meter, VFO A
and to listen to 2 meters on VFO B . I have had no luck! It looks like in
the information for K144XV it seems that this is possible :  "If you have a
KRX3 sub receiver installed, you can tune HF-6 meters with the sub while
operating on 2 meters with the main receiver/transmitter. "
http://www.elecraft.com/manual/K144XV%20Data%20Sheet%20rev%204sm.pdf
I have separate antennas for both bands. The 6 meter antenna is on #2 and
the 2 meter antenna is on #3.



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Re: [Elecraft] KRX3 & K144XV question

[Oliver Dröse]

Alan,

as your quoted instructions say: VFO A on 2 m, VFO B on HF-6. Does not 
work vice versa (as in your request) as the K144XV only connects to the 
main RX (plus the sub RX if you share both, that would mean VFO A + B 
both on 2 m). Also take a look at the RX switching PDF on the Elecraft 
website for deeper insight into possible RX path'.


73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de


Am 07.12.2015 um 21:58 schrieb Alan Muldawer:

I have a K3 with the second receiver KRX3 and I also have the internal 2
meter card K144XV and what I would like to do is to be on 6 meter, VFO A
and to listen to 2 meters on VFO B . I have had no luck! It looks like in
the information for K144XV it seems that this is possible :  "If you have a
KRX3 sub receiver installed, you can tune HF-6 meters with the sub while
operating on 2 meters with the main receiver/transmitter. "
http://www.elecraft.com/manual/K144XV%20Data%20Sheet%20rev%204sm.pdf
I have separate antennas for both bands. The 6 meter antenna is on #2 and
the 2 meter antenna is on #3.
Has anyone been able to do this and how. Thanks!
73 Alan N3ALN
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Re: [Elecraft] KRX3 always uses antenna from main RX

[Ignacy]

This must have been N1MM+ or I pressed RX ANT too long. I forgot that RX hold
has a functionality with SUB on, switching between AUX and MAIN. It is easy
to be fooled.
Good that this group exists. 
Ignacy
 



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[Elecraft] KRX3 always uses antenna from main RX

[Ignacy]

I tried diversity today and something is wrong. KRX3 input (BNC) is not
working and KRX3 receives always receives signals from the main RX.

In KRX3 menu, Ant=bnc

Definitely the diversity was working a couple of month ago. I upgraded to
the newest beta, and no change.  

Any idea what might have happened?

Ignacy, NO9E



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Re: [Elecraft] KRX3 always uses antenna from main RX

[Ignacy]

Please ignore. After a few turning of and on, reloading N1MM, etc., KRX3 is
working well again. Have no idea why BNC input was not working.
Ignacy




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Re: [Elecraft] KRX3 always uses antenna from main RX

[Guy Olinger K2AV]

N1MM has the capability to turn the KRX3 on and off depending on spots, and
can undo what you last did on the front panel. Doing a hold on RX ANT on
the front panel will toggle the KRX3 between MAIN and whatever is connected
to the AUX input. The latter could either be the BNC or the SO239 not in
use by the TX, depending on where the KRX3 aux input was connected at
assembly.

73, Guy K2AV

On Sat, Aug 8, 2015 at 10:27 PM, Ignacy n...@arrl.net wrote:

 Please ignore. After a few turning of and on, reloading N1MM, etc., KRX3 is
 working well again. Have no idea why BNC input was not working.
 Ignacy




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Re: [Elecraft] KRX3 always uses antenna from main RX

[Don Wilhelm]

Ignacy,

Which TMP connector is plugged into your subRX AUX input.
Is it the BNC connector or the TMP cable from the KAT3?
If it is the BNC connector, then the BNC jack should work - that is the 
plugging used for the K3 (K3S) factory build units.
If however, you have the TMP cable from the KAT3 plugged in, the subRX 
will use the non-transmit SO-239 jack when the subRX is set to AUX input.


It makes no difference what the menu says, you must set the menu 
according to how the K3 is physically connected, so if you do not have 
the BNC connector plugged to the subRX AUX input, you will not have any 
input from the BNC connector.  The magic is all in the physical setup, 
and the menu must be set according to that.


73,
Don W3FPR

On 8/8/2015 10:03 PM, Ignacy wrote:

I tried diversity today and something is wrong. KRX3 input (BNC) is not
working and KRX3 receives always receives signals from the main RX.

In KRX3 menu, Ant=bnc

Definitely the diversity was working a couple of month ago. I upgraded to
the newest beta, and no change.




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[Elecraft] KRX3 Question

[Grant Youngman]

Question .. Part no. is the same, but just to make sure ...

Is there something new about the KRX3 sub receiver listed with the K3S, or is 
it the same legacy component I currently have in my K3?

Thanks

Grant NQ5T

Sent from my iPhone
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Re: [Elecraft] KRX3 Question

[Grant Youngman]

I already have the new synth boards in my K3. Just would like to know if the 
receiver module itself is the same or if it's also been updated for the K3S. 

Grant NQ5T

Sent from my iPhone

 On May 14, 2015, at 6:31 PM, Phil Wheeler w...@socal.rr.com wrote:
 
 Perhaps the new synth board some of us have already installed in a K3?
 
 Phil W7OX
 
 On 5/14/15 3:31 PM, Grant Youngman wrote:
 Question .. Part no. is the same, but just to make sure ...
 
 Is there something new about the KRX3 sub receiver listed with the K3S, or 
 is it the same legacy component I currently have in my K3?
 
 Thanks
 
 Grant 
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Re: [Elecraft] KRX3 K3 Subreceiver Install

[Vic Rosenthal K2VCO]

It's not hard, but be careful plugging in the small coax cables. If they 
seem to require a lot of force, you may not have aligned the center pin 
with the contact in the jack on the KRX3 board. Too much force can 
damage the jack or the board.


On 3/27/2014 5:23 PM, Charles Tropp wrote:

Hi Phil,

I installed my sub-receiver a few months ago without difficulty. If you
have been inside your K3 previously, all will seem familiar. If not,
just follow the directions precisely and you will have no trouble. Don't
forget to install all your filters for the main receiver before you
start the new installation so that you don't have to take everything
apart again to reach them. By the way, I just love KRX3. It is so easy
to work split now that I cannot remember how I did it before.

Good luck,

Charles, N2SO
On 3/27/2014 7:32 PM, Oliver Dröse wrote:



--
73,

Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/

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[Elecraft] KRX3 K3 Subreceiver Install

[Phil Hystad]

I have heard a few stories about the difficulty of installing the KRX3 
sub-receiver into a K3.  Is there a consensus as to whether this is difficult, 
moderate, or reasonably easy straight-forward to install.

Thanks,

73, phil, K7PEH

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Re: [Elecraft] KRX3 K3 Subreceiver Install

[Joe Subich, W4TV]

Not difficult,just involved.  A second DSP board needs to be mounted
to the front panel and a second VCO board needs to be mounted to the 
bulkhead.  After that it's easy.


73,

   ... Joe, W4TV


On 3/27/2014 7:07 PM, Phil Hystad wrote:

I have heard a few stories about the difficulty of installing the KRX3 
sub-receiver into a K3.  Is there a consensus as to whether this is difficult, 
moderate, or reasonably easy straight-forward to install.

Thanks,

73, phil, K7PEH

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Re: [Elecraft] KRX3 K3 Subreceiver Install

[Oliver Dröse]

Hi Phil,

easy ... been there, done that.

It only gets difficult if you want to add other options that are mounted below 
the KRX3 after you did install it as you have to reverse the whole process 
than! So think about it (i.e. additional filters for the main RX) beforehand 
and combine it with the KRX3 if needed.

73  gl, Olli - DH8BQA



 Am 28.03.2014 um 00:07 schrieb Phil Hystad phys...@mac.com:
 
 I have heard a few stories about the difficulty of installing the KRX3 
 sub-receiver into a K3.  Is there a consensus as to whether this is 
 difficult, moderate, or reasonably easy straight-forward to install.
 
 Thanks,
 
 73, phil, K7PEH
 
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Re: [Elecraft] KRX3 K3 Subreceiver Install

[Slava Baytalskiy]

I just did this last weekend. Put the whole K3 together, including the KRX3.
Just don’t forget to remove the chassis stiffener and all will be well.
Oh, and those little coax interconnects that are on the back side of the front 
panel need to be nice and neat and out of the way.
KRX3 went in very nicely…

 
 Am 28.03.2014 um 00:07 schrieb Phil Hystad phys...@mac.com:
 
 I have heard a few stories about the difficulty of installing the KRX3 
 sub-receiver into a K3.  Is there a consensus as to whether this is 
 difficult, moderate, or reasonably easy straight-forward to install.
 
 Thanks,
 
 73, phil, K7PEH
 
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Re: [Elecraft] KRX3 K3 Subreceiver Install

[Phil Hystad]

Found it, like the background music too: Santana.

Thanks,
phil

On Mar 27, 2014, at 4:28 PM, Dick Dievendorff d...@elecraft.com wrote:

 I think PA3A put a video of his install on YouTube.
 
 Dick, K6KR
 
 
 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Hystad
 Sent: Thursday, March 27, 2014 16:07 PM
 To: Elecraft Reflector
 Subject: [Elecraft] KRX3 K3 Subreceiver Install
 
 I have heard a few stories about the difficulty of installing the KRX3
 sub-receiver into a K3.  Is there a consensus as to whether this is
 difficult, moderate, or reasonably easy straight-forward to install.
 
 Thanks,
 
 73, phil, K7PEH
 
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Re: [Elecraft] KRX3 K3 Subreceiver Install

[Charles Tropp]

Hi Phil,

I installed my sub-receiver a few months ago without difficulty. If you 
have been inside your K3 previously, all will seem familiar. If not, 
just follow the directions precisely and you will have no trouble. Don't 
forget to install all your filters for the main receiver before you 
start the new installation so that you don't have to take everything 
apart again to reach them. By the way, I just love KRX3. It is so easy 
to work split now that I cannot remember how I did it before.


Good luck,

Charles, N2SO
On 3/27/2014 7:32 PM, Oliver Dröse wrote:

Hi Phil,

easy ... been there, done that.

It only gets difficult if you want to add other options that are mounted below 
the KRX3 after you did install it as you have to reverse the whole process 
than! So think about it (i.e. additional filters for the main RX) beforehand 
and combine it with the KRX3 if needed.

73  gl, Olli - DH8BQA




Am 28.03.2014 um 00:07 schrieb Phil Hystad phys...@mac.com:

I have heard a few stories about the difficulty of installing the KRX3 
sub-receiver into a K3.  Is there a consensus as to whether this is difficult, 
moderate, or reasonably easy straight-forward to install.

Thanks,

73, phil, K7PEH

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[Elecraft] KRX3 input protection

[AD0ES]

Hi all,

My KRX3 is on the truck and due tuesday.  Quick question:  I will be running 
the main receiver on a receive only antenna
fed via the KXV3A and the subrx via its bnc aux.  These antennas are quite 
close to the xmit antennas.  Should I use
any sort of attenuation and/or external TR switch on either of these receiver 
inputs?  I eventually will be running a KPA500
full power...

tia,
Steve AD0ES

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Re: [Elecraft] KRX3 input protection

[Arie Kleingeld PA3A]

Steve,

the subRX of the K3 has its protection (an rf triggered relay if the 
power coming into the rx is too high).


I've used the K3-KPA500 on a beam and I had a diversity vertical 
connected to the subrx quite next to it. No problem at all.
It all depends on the coupling of the antennas. Try and see how you go 
at your QTH; the subRX is protected.


73
Arie PA3A

AD0ES schreef op 3-1-2014 15:23:

Hi all,

My KRX3 is on the truck and due tuesday.  Quick question:  I will be running 
the main receiver on a receive only antenna
fed via the KXV3A and the subrx via its bnc aux.  These antennas are quite 
close to the xmit antennas.  Should I use
any sort of attenuation and/or external TR switch on either of these receiver 
inputs?  I eventually will be running a KPA500
full power...

tia,
Steve AD0ES


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Re: [Elecraft] KRX3 input protection

[Jim Bennett]

Steve - 

I have a similar setup as Arie - an 80 meter Inverted L at 40 feet for my 
transmitting antenna and a Hustler 5BTV vertical ground mounted about 10 feet 
from being directly under the vertical. Works fine. If I crank up my KPA500, 
the relays in the K3 quickly isolate the subrx from too much RF.

Jim / W6JHB


On Jan 3, 2014, at 8:12 AM, Arie Kleingeld PA3A wrote:

 Steve,
 
 the subRX of the K3 has its protection (an rf triggered relay if the power 
 coming into the rx is too high).
 
 I've used the K3-KPA500 on a beam and I had a diversity vertical connected to 
 the subrx quite next to it. No problem at all.
 It all depends on the coupling of the antennas. Try and see how you go at 
 your QTH; the subRX is protected.
 
 73
 Arie PA3A
 
 AD0ES schreef op 3-1-2014 15:23:
 Hi all,
 
 My KRX3 is on the truck and due tuesday.  Quick question:  I will be running 
 the main receiver on a receive only antenna
 fed via the KXV3A and the subrx via its bnc aux.  These antennas are quite 
 close to the xmit antennas.  Should I use
 any sort of attenuation and/or external TR switch on either of these 
 receiver inputs?  I eventually will be running a KPA500
 full power...
 
 tia,
 Steve AD0ES
 
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Re: [Elecraft] KRX3 input protection

[Don Wilhelm]

Jim and Steve,

While the COR will do its job, I recommend that you not abuse it. If you 
hear the COR operating during transmit, it would be wise to provide some 
external switching (relay) to remove the RX antenna while transmitting 
or insert an attenuator.


Of course, the best solution is to locate the RX antenna away from the 
TX antenna, but that is not always a practical solution.


73,
Don W3FPR

On 1/3/2014 11:38 AM, Jim Bennett wrote:

Steve -

I have a similar setup as Arie - an 80 meter Inverted L at 40 feet for my 
transmitting antenna and a Hustler 5BTV vertical ground mounted about 10 feet 
from being directly under the vertical. Works fine. If I crank up my KPA500, 
the relays in the K3 quickly isolate the subrx from too much RF.

Jim / W6JHB


On Jan 3, 2014, at 8:12 AM, Arie Kleingeld PA3A wrote:


Steve,

the subRX of the K3 has its protection (an rf triggered relay if the power 
coming into the rx is too high).

I've used the K3-KPA500 on a beam and I had a diversity vertical connected to 
the subrx quite next to it. No problem at all.
It all depends on the coupling of the antennas. Try and see how you go at your 
QTH; the subRX is protected.




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Re: [Elecraft] KRX3 input protection

[Charlie T, K3ICH]

I saw a suggestion somewhere for using a small grain-of-wheat bulb across 
the 2nd antenna's lead as you gradually increase transmit power.  If I 
remember correctly, the bulb I used was a 5 V @ 50 mA lamp, typical of those 
used as LCD screen illuminators.


I tried that with a 600 ' Beverage that is at least 75 feet from any 
transmit antenna and was very surprised to see the bulb glowing brightly on 
a couple bands with only 50 watts into the LPDA up at 55'.   The Beverage is 
fed with a 9:1 transformer and is about 8 feet off the ground, running away 
from any active antennas.


Try it, it's quite an eye opener.

73, Charlie k3ICH


- Original Message - 
From: Arie Kleingeld PA3A p...@xs4all.nl

To: elecraft@mailman.qth.net
Sent: Friday, January 03, 2014 11:12 AM
Subject: Re: [Elecraft] KRX3 input protection



Steve,

the subRX of the K3 has its protection (an rf triggered relay if the power 
coming into the rx is too high).


I've used the K3-KPA500 on a beam and I had a diversity vertical connected 
to the subrx quite next to it. No problem at all.
It all depends on the coupling of the antennas. Try and see how you go at 
your QTH; the subRX is protected.


73
Arie PA3A

AD0ES schreef op 3-1-2014 15:23:

Hi all,

My KRX3 is on the truck and due tuesday.  Quick question:  I will be 
running the main receiver on a receive only antenna
fed via the KXV3A and the subrx via its bnc aux.  These antennas are 
quite close to the xmit antennas.  Should I use
any sort of attenuation and/or external TR switch on either of these 
receiver inputs?  I eventually will be running a KPA500

full power...

tia,
Steve AD0ES


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[Elecraft] KRX3, KXV3A, IF-out

[AD0ES]

Hi,

Just about to throw the switch on a KRX3 order.  Going over the manuals I see 
no way to attach the IF-out of the
KXV3A to the sub-receiver.  It seems natural to use the panadapter on the sub 
to watch other bands while working
with the main rx.  Am I missing something, or must the IF-out come from the 
main rx?  I already have the KXV3A
installed, I will be adding the KRX3, along with additional filters for the 
main rx.

Steve AD0ES

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Re: [Elecraft] KRX3 and filters for sale

[VE3WDM]

The KRX3 has been sold
Mike
VE3WDM



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[Elecraft] KRX3 and filters for sale

[Mike Weir]

I am selling my KRX3 sub receiver along with  the following three 8 pole inrad 
filters250 Hz 8 pole400 Hz 8 pole 500 Hz 8 pole New KRX3 599.00each inrad 
filter 119.00 Total 956.00Selling for 650.00 firm plus shipping Mike VE3WDM
  
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Re: [Elecraft] KRX3 and filters for sale

[VE3WDM]

The KRX3 has been sold 
Mike
VE3WDM



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Re: [Elecraft] KRX3 - What am I missing?

[Richard Ferch]

SO2R has a different purpose than a KRX3. In SO2R, the two radios are 
normally connected to separate antennas and operating on different 
bands. It's a contesting technique that allows you to listen on one band 
while transmitting on another band.


If you wanted to use a second transceiver to listen to pileups while 
working DX, you would need external switching to disconnect the antenna 
from the second transceiver whenever the first transceiver was 
transmitting, in order to avoid damaging its receiver, rather like the 
old days of separate transmitters and receivers.


So, if your intended use is DXing, I would say that the KRX3 would be a 
better investment than a K3/10. If your eventual goal is full-bore 
pedal-to-the-metal contesting, a second transceiver, amplifier and 
tower might be in your future, and the KRX3 might not be so important to 
you.


73,
Rich VE3KI


NK4I wrote:


I'm wondering how many people go straight to SO2R?  I have a P3 and have
been thinking about adding a KRX3 but wonder if a better investment is a
K3/10.


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Re: [Elecraft] KRX3 - What am I missing?

[Fred Smith]

I do an SO2R setup using 2 K3's 1 Alpha amp,1 Elecraft the key to the
antennas are very simple. I use an Array Solutions SIX PAK antenna
controller a remote one mine is mounted in my basement control head in the
shack. Auto-tuners and auto band selecting on both and tuning on the Alpha.
I also use a simple switching unit when one key line is on other radio
receive is off you can build one from a junk box.

If you care to see my setup it's on my QRZ page my KX3 can't be seen there.


73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100--KAT100
P3/SVGA--KPA500--KAT500--W2



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Richard Ferch
Sent: Wednesday, March 27, 2013 6:17 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KRX3 - What am I missing?

SO2R has a different purpose than a KRX3. In SO2R, the two radios are
normally connected to separate antennas and operating on different bands.
It's a contesting technique that allows you to listen on one band while
transmitting on another band.

If you wanted to use a second transceiver to listen to pileups while working
DX, you would need external switching to disconnect the antenna from the
second transceiver whenever the first transceiver was transmitting, in order
to avoid damaging its receiver, rather like the old days of separate
transmitters and receivers.

So, if your intended use is DXing, I would say that the KRX3 would be a
better investment than a K3/10. If your eventual goal is full-bore
pedal-to-the-metal contesting, a second transceiver, amplifier and tower
might be in your future, and the KRX3 might not be so important to you.

73,
Rich VE3KI


NK4I wrote:

 I'm wondering how many people go straight to SO2R?  I have a P3 and have
 been thinking about adding a KRX3 but wonder if a better investment is a
 K3/10.

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Version: 2013.0.2904 / Virus Database: 2641/6206 - Release Date: 03/26/13

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Re: [Elecraft] KRX3 - What am I missing?

[Fred Smith]

I'm a DXer only and I have to answer yes, I do have a second K3 in a SO2R
setup. One of the main reasons any more are the extremely wide splits some
of the DX has used in recent years. I have several antennas available plus a
receive only antenna/preamp that is very helpful at times. I use a yagi
and my multi-band vertical together the diversity of those is at times is
the difference in making a contact or not.

I am not a CW op only Digital/SSB so on my sub I only installed a 2.8 and a
.400 my main is loaded down to .250 all filters are 8 pole.

Fred/N0AZZ

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill Myers
Sent: Tuesday, March 26, 2013 6:27 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KRX3 - What am I missing?

I'm trying to resolve a conflict: is the KRX3 sub receiver a must have, or
a must have with good reasons option?

I understand it's uses.  In my case, I am mostly considering it as an added
resource for working dx split pileups.  I have the P3, and have found it
very useful in many ways, and especially for dx - so useful, that I question
how much the KRX3 will add.  You more-experienced dxers maybe can help point
out what I am missing.

I usually can develop a reasonable pile-up strategy using the P3 - and
that seems to work most of the time.  I must lack the dexterity to make the
REV routine add anything.  Even with the sub-rx, I estimate that it would
help in only a small percentage of the situations, particularly in those
large (and ill-mannered) pile-ups where the P3 shows a solid wall of
signals.  (Maybe the ears might catch a faint 599 that the P3 won't show?)

Most of the dxers I talk to say the KRX3 is a must.  I'll probably get one
anyway, but what am I missing here?

Bill K6IFF 



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[Elecraft] KRX3 - What am I missing?

[Bill Myers]

I'm trying to resolve a conflict: is the KRX3 sub receiver a must have, or
a must have with good reasons option?

I understand it's uses.  In my case, I am mostly considering it as an added
resource for working dx split pileups.  I have the P3, and have found it
very useful in many ways, and especially for dx - so useful, that I question
how much the KRX3 will add.  You more-experienced dxers maybe can help point
out what I am missing.

I usually can develop a reasonable pile-up strategy using the P3 - and
that seems to work most of the time.  I must lack the dexterity to make the
REV routine add anything.  Even with the sub-rx, I estimate that it would
help in only a small percentage of the situations, particularly in those
large (and ill-mannered) pile-ups where the P3 shows a solid wall of
signals.  (Maybe the ears might catch a faint 599 that the P3 won't show?)

Most of the dxers I talk to say the KRX3 is a must.  I'll probably get one
anyway, but what am I missing here?

Bill K6IFF 



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Re: [Elecraft] KRX3 - What am I missing?

[Jim Sheldon]

Bill, 
You've already pretty much answered your own question.  Hearing that faint 
599 is a BIG help in finding the place you need to be in a pile-up.  
Especially on 20, 17, 15, 12 and 10 meters where a lot of the time you are in 
the skip zone where you don't see the pip from the station the DX is working 
on the P3's screen.  If you put the same filter(s) in it, the KRX3 is an exact 
duplicate electronically of the main receiver.  The one drawback is you lose 
3dB when you have them both connected through the ATU as there's a 3dB splitter 
inserted in the chain when the subreceiver is switched in.  If you have the 
luxury of separate antennas, you can alleviate that.  If the incoming signal is 
S5 or stronger, it becomes a non-issue anyway unless there's a bunch of QRN 
from a thunderstorm in the vicinity and then all bets are off - LOL.

I was thinking sort of like you when I ordered my K3, but decided to go ahead 
with the sub receiver and I have been super glad I did.  Example, this 
afternoon on 17 meters, XR0YG (Easter Island) was fairly strong and using the 
P3 plus the second receiver, it took me about 30 seconds to determine where he 
was listening and which way he was tuning.  One call and he was in the log.  I 
didn't even have the amplifier on and the K3 was set to about 60 watts.  
Antenna was a fan dipole up about 35 feet at the apex.

Jim Sheldon - W0EB

 I'm trying to resolve a conflict: is the KRX3 sub receiver a must
 have, or a must have with good reasons option?

 I understand it's uses.  In my case, I am mostly considering it as
 an added resource for working dx split pileups.  I have the P3, and
 have found it very useful in many ways, and especially for dx - so
 useful, that I question how much the KRX3 will add.  You more-
 experienced dxers maybe can help point out what I am missing.

 I usually can develop a reasonable pile-up strategy using the P3 -
 and that seems to work most of the time.  I must lack the
 dexterity to make the REV routine add anything.  Even with the sub-
 rx, I estimate that it would help in only a small percentage of the
 situations, particularly in those large (and ill-mannered) pile-ups
 where the P3 shows a solid wall of signals.  (Maybe the ears might
 catch a faint 599 that the P3 won't show?)

 Most of the dxers I talk to say the KRX3 is a must.  I'll probably
 get one anyway, but what am I missing here?

 Bill K6IFF

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Re: [Elecraft] KRX3 - What am I missing?

[Don Wilhelm]

Bill,

You are not missing anything.  The KRX3 will allow you to listen to the 
DX in one ear and the pileup in the other ear.  If you would find that 
confusing to your brain, then the KRX3 will be useless for you. but if 
your brain can sort out the left ear, right ear situation, then it is a 
great operating asset.


In listening to the pileup, you are hunting for the station the DX is 
currently talking with, and the KRX3 makes that task much easier than 
using the REV button.  The P3 may add value in hunting for a clear space 
in the pileup, but there is nothing like having aural feedback to 
determine what is happening on your proposed transmit frequency.


73,
Don W3FPR

On 3/26/2013 7:27 PM, Bill Myers wrote:

I'm trying to resolve a conflict: is the KRX3 sub receiver a must have, or
a must have with good reasons option?

I understand it's uses.  In my case, I am mostly considering it as an added
resource for working dx split pileups.  I have the P3, and have found it
very useful in many ways, and especially for dx - so useful, that I question
how much the KRX3 will add.  You more-experienced dxers maybe can help point
out what I am missing.

I usually can develop a reasonable pile-up strategy using the P3 - and
that seems to work most of the time.  I must lack the dexterity to make the
REV routine add anything.  Even with the sub-rx, I estimate that it would
help in only a small percentage of the situations, particularly in those
large (and ill-mannered) pile-ups where the P3 shows a solid wall of
signals.  (Maybe the ears might catch a faint 599 that the P3 won't show?)

Most of the dxers I talk to say the KRX3 is a must.  I'll probably get one
anyway, but what am I missing here?



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Re: [Elecraft] KRX3 - What am I missing?

[Tighe Kuykendall]

I'm wondering how many people go straight to SO2R?  I have a P3 and have 
been thinking about adding a KRX3 but wonder if a better investment is a 
K3/10.


Tighe
NK4I

On 3/26/2013 7:45 PM, Don Wilhelm wrote:

Bill,

You are not missing anything.  The KRX3 will allow you to listen to 
the DX in one ear and the pileup in the other ear.  If you would find 
that confusing to your brain, then the KRX3 will be useless for you. 
but if your brain can sort out the left ear, right ear situation, then 
it is a great operating asset.


In listening to the pileup, you are hunting for the station the DX is 
currently talking with, and the KRX3 makes that task much easier than 
using the REV button.  The P3 may add value in hunting for a clear 
space in the pileup, but there is nothing like having aural feedback 
to determine what is happening on your proposed transmit frequency.


73,
Don W3FPR

On 3/26/2013 7:27 PM, Bill Myers wrote:
I'm trying to resolve a conflict: is the KRX3 sub receiver a must 
have, or

a must have with good reasons option?

I understand it's uses.  In my case, I am mostly considering it as an 
added

resource for working dx split pileups.  I have the P3, and have found it
very useful in many ways, and especially for dx - so useful, that I 
question
how much the KRX3 will add.  You more-experienced dxers maybe can 
help point

out what I am missing.

I usually can develop a reasonable pile-up strategy using the P3 - and
that seems to work most of the time.  I must lack the dexterity to 
make the
REV routine add anything.  Even with the sub-rx, I estimate that it 
would

help in only a small percentage of the situations, particularly in those
large (and ill-mannered) pile-ups where the P3 shows a solid wall of
signals.  (Maybe the ears might catch a faint 599 that the P3 won't 
show?)


Most of the dxers I talk to say the KRX3 is a must.  I'll probably 
get one

anyway, but what am I missing here?



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[Elecraft] KRX3 aux protection: good idea?

[Franki ON5ZO]

Hello folks

My KRX3's carrier operated relay is rattling when I have an RX loop connected 
to its aux input when I transmit on 160/80. Too much antennas on a too small 
lot. Nah, Whadda ya gonna do?

As a quick fix I used an A/B antenna switching relay to open the RX chain when 
TXing. Loop on input A and switch to unconnected input B with PTT. But this QRO 
relay is very noisy to have it clicking away in the shack. With the box on the 
desk, I even feel it switching. So I'm going to make a silent dedicated 
solution for it.

Would the following idea have any side effects or negative consequences? I'm 
planning to use a DPDT relay as follows:
when in RX: NC contact in series to pass the signal, NO contact parallel over 
the input
when in TX: NC contact in series opens and blocks the signal, NO parallel over 
the input closes thus the RX is short circuited to GND. Or would a 50ohm 
resistor over the input be better than a pure short (seen somewhere on the web)?

Would this work? I can't see why not. Would any other stuff be needed or 
recommended (diodes, caps, MOV?) for RX protection?

All input appreciated. TNX / 73
Franki ON5ZO
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[Elecraft] KRX3 sub rcvr

[P.J.Hicks]

I am in the final stages (testing and calibration) of building my K3.  While 
building I reasearched a bit more into the sub receiver thing and decided it 
was neither useful nor of interest to me. So... 



I have one new, never opened (except to inventory small parts) KRX3 for sale at 
a small discount. 



Contact me off list if interested. 



P. J. Hicks, N7PXY    hickspj467 (at) comcast (dot) net    no spaces
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[Elecraft] KRX3 sub rx

[P.J.Hicks]

Gentlemen the unit has been sold. 



Tnx, PJ 

N7PXY 
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Re: [Elecraft] KRX3 insatall

[Mike Reublin]

Thanks to all who offered suggestions.  I just got off the phone with Howard in 
Elecraft support. He got it sorted in very short order. 

As is so often the case, it was pilot error. RF gain was turned down. DOH! 

73, Mike NF4L
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Re: [Elecraft] KRX3 insatall

[Mike Reublin]

Thanks Wayne. All the settings look good. With the balance knob fully 
clockwise, the sub is in the right ear. Turning CCW, the main starts to be 
heard at 3:30.

73, Mike NF4L

On Oct 30, 2012, at 9:28 PM, Wayne Burdick n...@elecraft.com wrote:

 Mike,
 
 The KRX3 should have the same overall gain as the K3's main receiver.
 
 Try going into BSET Mode to see if the preamp is turned on on the sub 
 receiver. You can also adjust other sub-RX settings in BSET mode, including 
 NB, NR, and filter bandwidth, all of which can affect gain.
 
 73,
 Wayne
 N6KR
 
 On Oct 30, 2012, at 5:48 PM, Mike Reublin wrote:
 
 The KRX3 is installed and working! Time was 5 1/2 hours including 
 configuration. Usual outstanding fit and instructions.
 
 I installed it to use the ATU for aux, and I put the BNC in if I ever want 
 to change.
 
 I have it set to use the SUB AF control as balance.
 
 FIrst impression listening to one station working up 1 on 30M:
 The KRX3 has a noticeably lower volume.
 
 And I found out my speakers and headphones are opposite (left/right) to each 
 other...
 
 Mike, NF4L
 
 
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Re: [Elecraft] KRX3 insatall

[Edward R Cole]

I built my K3/10 and installed the KRX3 with no issues of different 
audio levels.

BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio 
level on a bar graph for each (when in diversity mode).

Two things were recently done to improve use of the 
LP-Pan:  1)  Enabling an open filter position in the K3 and KRX3 
eliminates gain suck out by roofing filter which is connected in 
parallel with the IF output jack.  It shows as a dip in gain on a 
panadaptor spectrum display at center freq.  2)  Installed 32.860 MHz 
xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates 
the previous +6 KHz freq. off set in the display sw (thanks to Larry, N8LP).

My 2m-eme dual-polarity adaptive receive system will get a work-out 
in this weekend's eme contest.  It extensively uses the dual-Rx 
diversity reception mode of the K3.

73, Ed - KL7UW

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Re: [Elecraft] KRX3 insatall

[ab2tc]

Hi,

I have absolutely no dip in the center of my LP-Pan display and I have never
heard anybody else having this problem either. The IF out port and the
crystal filter bank are driven in parallel by a buffer amplifier that
appears to be capable of driving both without gain loss due to the crystal
filter load.

AB2TC - Knut


Edward R Cole wrote
 I built my K3/10 and installed the KRX3 with no issues of different 
 audio levels.
 
 BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio 
 level on a bar graph for each (when in diversity mode).
 
 Two things were recently done to improve use of the 
 LP-Pan:  1)  Enabling an open filter position in the K3 and KRX3 
 eliminates gain suck out by roofing filter which is connected in 
 parallel with the IF output jack.  It shows as a dip in gain on a 
 panadaptor spectrum display at center freq.  2)  Installed 32.860 MHz 
 xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates 
 the previous +6 KHz freq. off set in the display sw (thanks to Larry,
 N8LP).
 
 My 2m-eme dual-polarity adaptive receive system will get a work-out 
 in this weekend's eme contest.  It extensively uses the dual-Rx 
 diversity reception mode of the K3.
 
 73, Ed - KL7UW





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Re: [Elecraft] KRX3 insatall

[Brian Alsop]

If one looks at the schematic there is a JFET buffer between the IF and 
the IF out in the main RX.  Isolation and impedance matching is its 
function.  There is no stock IF out for the subrx and hence no JFET.

JFETs have really high input impedances.

A one resistor gain mod is on the K3 site reduces the signal loss in 
this JFET stage for those using the IF output jack.

73 de Brian/K3KO

On 10/31/2012 21:10, ab2tc wrote:
 Hi,

 I have absolutely no dip in the center of my LP-Pan display and I have never
 heard anybody else having this problem either. The IF out port and the
 crystal filter bank are driven in parallel by a buffer amplifier that
 appears to be capable of driving both without gain loss due to the crystal
 filter load.

 AB2TC - Knut


 Edward R Cole wrote
 I built my K3/10 and installed the KRX3 with no issues of different
 audio levels.

 BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio
 level on a bar graph for each (when in diversity mode).

 Two things were recently done to improve use of the
 LP-Pan:  1)  Enabling an open filter position in the K3 and KRX3
 eliminates gain suck out by roofing filter which is connected in
 parallel with the IF output jack.  It shows as a dip in gain on a
 panadaptor spectrum display at center freq.  2)  Installed 32.860 MHz
 xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates
 the previous +6 KHz freq. off set in the display sw (thanks to Larry,
 N8LP).

 My 2m-eme dual-polarity adaptive receive system will get a work-out
 in this weekend's eme contest.  It extensively uses the dual-Rx
 diversity reception mode of the K3.

 73, Ed - KL7UW





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Re: [Elecraft] KRX3 insatall

[Mike Reublin]

I don't have an L-P Pan.

Mike NF4L

On Oct 31, 2012, at 5:10 PM, ab2tc ab...@arrl.net wrote:

 Hi,
 
 I have absolutely no dip in the center of my LP-Pan display and I have never
 heard anybody else having this problem either. The IF out port and the
 crystal filter bank are driven in parallel by a buffer amplifier that
 appears to be capable of driving both without gain loss due to the crystal
 filter load.
 
 AB2TC - Knut
 
 
 Edward R Cole wrote
 I built my K3/10 and installed the KRX3 with no issues of different 
 audio levels.
 
 BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio 
 level on a bar graph for each (when in diversity mode).
 
 Two things were recently done to improve use of the 
 LP-Pan:  1)  Enabling an open filter position in the K3 and KRX3 
 eliminates gain suck out by roofing filter which is connected in 
 parallel with the IF output jack.  It shows as a dip in gain on a 
 panadaptor spectrum display at center freq.  2)  Installed 32.860 MHz 
 xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates 
 the previous +6 KHz freq. off set in the display sw (thanks to Larry,
 N8LP).
 
 My 2m-eme dual-polarity adaptive receive system will get a work-out 
 in this weekend's eme contest.  It extensively uses the dual-Rx 
 diversity reception mode of the K3.
 
 73, Ed - KL7UW
 
 
 
 
 
 --
 View this message in context: 
 http://elecraft.365791.n2.nabble.com/KRX3-insatall-tp7564774p7564863.html
 Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KRX3 insatall

[Mike Reublin]

Is that the addition across R91 if R91 is greater that 22 ohms? IF out would 
affect the P3, not audio volume, right?

Mike NF4L

On Oct 31, 2012, at 5:55 PM, Brian Alsop als...@nc.rr.com wrote:

 If one looks at the schematic there is a JFET buffer between the IF and 
 the IF out in the main RX.  Isolation and impedance matching is its 
 function.  There is no stock IF out for the subrx and hence no JFET.
 
 JFETs have really high input impedances.
 
 A one resistor gain mod is on the K3 site reduces the signal loss in 
 this JFET stage for those using the IF output jack.
 
 73 de Brian/K3KO
 
 On 10/31/2012 21:10, ab2tc wrote:
 Hi,
 
 I have absolutely no dip in the center of my LP-Pan display and I have never
 heard anybody else having this problem either. The IF out port and the
 crystal filter bank are driven in parallel by a buffer amplifier that
 appears to be capable of driving both without gain loss due to the crystal
 filter load.
 
 AB2TC - Knut
 
 
 Edward R Cole wrote
 I built my K3/10 and installed the KRX3 with no issues of different
 audio levels.
 
 BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio
 level on a bar graph for each (when in diversity mode).
 
 Two things were recently done to improve use of the
 LP-Pan:  1)  Enabling an open filter position in the K3 and KRX3
 eliminates gain suck out by roofing filter which is connected in
 parallel with the IF output jack.  It shows as a dip in gain on a
 panadaptor spectrum display at center freq.  2)  Installed 32.860 MHz
 xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates
 the previous +6 KHz freq. off set in the display sw (thanks to Larry,
 N8LP).
 
 My 2m-eme dual-polarity adaptive receive system will get a work-out
 in this weekend's eme contest.  It extensively uses the dual-Rx
 diversity reception mode of the K3.
 
 73, Ed - KL7UW
 
 
 
 
 
 --
 View this message in context: 
 http://elecraft.365791.n2.nabble.com/KRX3-insatall-tp7564774p7564863.html
 Sent from the Elecraft mailing list archive at Nabble.com.
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 Checked by AVG - www.avg.com
 Version: 2012.0.2221 / Virus Database: 2441/5365 - Release Date: 10/31/12
 
 
 
 
 
 -
 No virus found in this message.
 Checked by AVG - www.avg.com
 Version: 2012.0.2221 / Virus Database: 2441/5365 - Release Date: 10/31/12
 
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Re: [Elecraft] KRX3 insatall

[Fred Jensen]

On 10/31/2012 4:34 PM, Mike Reublin wrote:
 Is that the addition across R91 if R91 is greater that 22 ohms? IF
 out would affect the P3, not audio volume, right?

Long thread, getting confused.

1.  The IF output [to a P3 or anything else listening to 8215 KHz on the 
IF OUT BNC connector] comes from the main receiver in the K3.

2.  So far as I know, there is *no* IF output from the sub-receiver 
unless you home brew it.

3.  Earlier K3 S/N's had a somewhat low IF output for a P3, which 
probably didn't exist then.  Elecraft offers a mod [you're surprised? 
:-)].  It involves removing one SM resistor and replacing it with 
another.  They supply both an SMD and a leaded-resistor, with 
instructions for both.  I used the leaded one, works fine.

4.  I don't know what earlier means, but my K3 is S/N 642 and I did 
the mod.  Second biggest problem was disconnecting the nest of wires 
from my wireless to get it out to work on.  Biggest problem was 
reconnecting all of them.

5.  Somewhere in the delivery of later S/N's, the mod has been 
incorporated.

6.  With the mod completed [really easy], and all the wires reconnected, 
I calibrated my S-meter to S9=50uV from my service monitor.  The P3 then 
calibrated nicely so S9=-73dBm on the ordinate.

That's my story and I'm sticking to it.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org

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Re: [Elecraft] KRX3 insatall

[Cady, Fred]

Hi Mike,
You are going to like using the sub receiver. It makes finding the right
place in the pileup to call SOOO much easier.
If you are not that much interested in diversity reception just go ahead
and connect the sub receiver ant to the ATU. That will give you the most
flexible installation where you can use the R8 on the sub RX and do
diversity plus use the R8 connected to the main for transmitting also.
If you connect the sub RX to the Aux BNC, you are limited to only
sharing the main antenna or listening to a receiver antenna on the Aux
BNC. Some people find that useful if they have, say, a receive vertical
antenna on 6 meters to listen for band openings. In any case, do install
the Aux ant BNC in case you ever want to switch. 
73 and have fun,
Fred, KE7X

The Elecraft K3: Design, Configuration and Operation
www.ke7x.com 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike Reublin
Sent: Monday, October 29, 2012 4:33 PM
To: Elecraft Reflector
Subject: [Elecraft] KRX3 insatall

In anticipation of my KRX3 arriving tomorrow, I've been reading the
install manual. I plan to have the KRX3 share the same antenna as the
main RX. I don't think I can do diversity RX. 

I have a second antenna (R8) but I'm not sure it's well enough isolated
(40' from the tower) and it doesn't hear as well as the 4L SteppIR.
160/80M are 1/4 wave slopers on the tower.

I assume(DANGER WIll Robinson!) that I skip from Auxiliary KRX3 Antenna
Input (Optional) on p.25 to Assembling the KRX3 Subreceiver Module on
p. 30.

Any gotchas I need to watch out for?

73, Mike NF4L
 

 
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Re: [Elecraft] KRX3 insatall

[Mike Reublin]

The KRX3 is installed and working! Time was 5 1/2 hours including 
configuration. Usual outstanding fit and instructions.

I installed it to use the ATU for aux, and I put the BNC in if I ever want to 
change.

I have it set to use the SUB AF control as balance.

FIrst impression listening to one station working up 1 on 30M:
The KRX3 has a noticeably lower volume.

And I found out my speakers and headphones are opposite (left/right) to each 
other...

Mike, NF4L


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Re: [Elecraft] KRX3 insatall

[Wayne Burdick]

Mike,

The KRX3 should have the same overall gain as the K3's main receiver.

Try going into BSET Mode to see if the preamp is turned on on the sub  
receiver. You can also adjust other sub-RX settings in BSET mode,  
including NB, NR, and filter bandwidth, all of which can affect gain.

73,
Wayne
N6KR

On Oct 30, 2012, at 5:48 PM, Mike Reublin wrote:

 The KRX3 is installed and working! Time was 5 1/2 hours including  
 configuration. Usual outstanding fit and instructions.

 I installed it to use the ATU for aux, and I put the BNC in if I  
 ever want to change.

 I have it set to use the SUB AF control as balance.

 FIrst impression listening to one station working up 1 on 30M:
 The KRX3 has a noticeably lower volume.

 And I found out my speakers and headphones are opposite (left/right)  
 to each other...

 Mike, NF4L


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Re: [Elecraft] KRX3 insatall

[Cady, Fred]

What Wayne said Mike plus you can double tap AB to set the sub to the main 
settings as the main. You can fix you left/right challenged speakers with the 
L-MIX-R menu too.
Cheers,
Fred
 

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Tuesday, October 30, 2012 7:28 PM
To: Mike Reublin
Cc: Elecraft Reflector
Subject: Re: [Elecraft] KRX3 insatall

Mike,

The KRX3 should have the same overall gain as the K3's main receiver.

Try going into BSET Mode to see if the preamp is turned on on the sub receiver. 
You can also adjust other sub-RX settings in BSET mode, including NB, NR, and 
filter bandwidth, all of which can affect gain.

73,
Wayne
N6KR

On Oct 30, 2012, at 5:48 PM, Mike Reublin wrote:

 The KRX3 is installed and working! Time was 5 1/2 hours including  
 configuration. Usual outstanding fit and instructions.

 I installed it to use the ATU for aux, and I put the BNC in if I  
 ever want to change.

 I have it set to use the SUB AF control as balance.

 FIrst impression listening to one station working up 1 on 30M:
 The KRX3 has a noticeably lower volume.

 And I found out my speakers and headphones are opposite (left/right)  
 to each other...

 Mike, NF4L


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[Elecraft] KRX3 insatall

[Mike Reublin]

In anticipation of my KRX3 arriving tomorrow, I've been reading the install 
manual. I plan to have the KRX3 share the same antenna as the main RX. I don't 
think I can do diversity RX. 

I have a second antenna (R8) but I'm not sure it's well enough isolated (40' 
from the tower) and it doesn't hear as well as the 4L SteppIR. 160/80M are 1/4 
wave slopers on the tower.

I assume(DANGER WIll Robinson!) that I skip from Auxiliary KRX3 Antenna Input 
(Optional) on p.25 to Assembling the KRX3 Subreceiver Module on p. 30.

Any gotchas I need to watch out for?

73, Mike NF4L
 

 
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[Elecraft] Krx3 ERR PLL2

[C L Jonkers]

Help. Of course its Saturday. Just finished the install of a KRX3 and got a 
dreaded ERR PLL2. Re-installed all the TMP cables, visually confirmed all the 
PC 
boards were plugged in correctly, cycled the power and  re-did the calibration 
to no avail.

Any ideas on something I may have missed, shoud try or look for while waiting 
for Monday? 

73,
Neil NJ6L
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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Guy Olinger K2AV]

You insist on making this an either/or kind of choice, and it simply
is not.  APF does not make a result in your brain, it simply listens
to slower CW with a very narrow bandwidth. It seems to have times when
it will pull something out of noise, and other times not, by use of
the narrowness.

Diversity does not narrow what you hear.  The randomness of noise
causes it to spread around the audio compass while discrete signals
will appear to come from a single direction, and signals going through
fades will do a rotation at the bottom without actually losing copy.
 The spreading around of the noise is sometimes worth 10/15 dB of
separation with whisper level signals in the clear, and undetectable
in the monophonic, even with APF.  With different kinds of noise, only
the APF seems to work to pull out a signal.

This and APF are not an either/or thing.  I use one or the other, and
rarely, both at the same time.

If you can get a chance to listen to a K3 on diversity, you will
understand.  IF for some very silly reason I was forced to chose
between APF and diversity, I would chose diversity, because of all the
other uses of the excellent second RX.

Go hear one.

73, Guy.

On Tue, Jul 12, 2011 at 10:39 PM, callen1155 callen1...@yahoo.com wrote:
 Thanks for the responses but I'm at a loss as to why the question is
 confusing. I'm trying to determine the most efficient method to hear
 weak/fading cw signals.

 I have read on here many times where folks brag on the 2nd receivers'
 ability to overcome fading band conditions via diversity receive using
 complementing antennas. I have read and experienced the benefit of APF under
 those same band conditions as well.

 I understand diversity receive and APF go about it two totally different
 ways but the end result is an improved ability to hear weak/fading signals.

 My question is simply, under weak/fading band conditions when you're
 straining to copy the cw sig (assuming you have both APF and diversity
 receive to choose from), which would you choose to improve your copy and
 make the contact?

 thanks again.
 chuck

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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Barry N1EU]

Guy, K2AV wrote:
 
 to evaluate diversity, you need to go somewhere and HEAR diversity from a
 dual RX K3.  Then you'll have the sensory answer to your question,
 whether you decide to get it or not.
 
To get a good taste of diversity for weak signal cw reception, plug a pair
of stereo headphones into your computer's soundcard and listen to these:

http://n1eu.com/K3/rz0af_160M_8nov08_2255Z.mp3
http://n1eu.com/K3/4s7ne_80M_26Dec10_2350Z.mp3

73, Barry N1EU



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Re: [Elecraft] KRX3 vs APF on weak signals ??

[callen1155]

Thanks for the explanations and your patience gentlemen.
 I've got it now.

73.
chuck
AF4XK



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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Mike K2MK]

Hi Chuck,

Diversity reception may not work for everybody. My brain can't handle it.
Having a near identical sound in both ears with one side fading in and out
doesn't seem to make it easier for me to copy. I prefer to just switch
between two antennas and listen to the one that sounds best. To do this you
need a separate receive antenna and the KXV3A I/O board. I still love the
Sub RX and use it frequently but not for diversity.

73,
Mike K2MK


callen1155 wrote:
 
 Hello folks.
 
 I operate cw 98% of the time.
 After 'rag chewing' for several years I'm becoming more interested in
 DX'ing. Also I'm eager to try my luck on 160 meters despite my QTH and
 antenna restrictions.
 
 I've been considering purchasing the KRX3 (second receiver) for a year or
 more. 
 
 However with the recent firmware upgrades and now the APF (audio peaking
 filter) feature on the standard K3 I'm wondering if the second receivers
 'diversity receive'  capability would be that much superior to the APF for
 weak/fading signals?  
 
 (My results vary using the APF; abort 1/3 of the time it helps, 1/3 of the
 time I get  'clearer' copy with very narrow DSP bandwidth and no APF... 
 the final 1/3 is a no copy either way.)
 
 If the APF approaches the effectiveness of the KRX3 on weak/fading sigs I
 may just go for a P3 instead.
 
 Thanks for any advice.
 chuck
 AF4XK
 


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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Barry N1EU]

Mike K2MK wrote:
 
 Diversity reception may not work for everybody. My brain can't handle it. 

I guess I'm the opposite.  I use diversity virtually all the time on
160M-20M.  Even when the rx antenna + subrx isn't necessarily making the
signal more readable, I find the stereo effect very pleasing to listen to.

73, Barry N1EU


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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Edward R. Cole]

Whichever works better or BOTH if that works better.
They do different things so I don't think you can answer the 
questions which is better.

I think you are trying to justify why to buy the KRX3.  And the 
answer is a question (sorry):  What is your intention for its 
use?  You stated an interest in:
1)  160m
2)  Weak/fading CW

APF works pretty nice in peaking weak CW (and its free with the K3).
But my understanding of 160m (not QRV there - yet) is that using a 
low-noise reception antenna in diversity mode can make a significant 
improvement in fading signals.  Ideally (on 160m) that would be use 
of a long wire like a Beverage or smaller low-noise antenna like 
Pendant (but this depends a lot on how much real estate you have).

On 600m as WD2XSH/45, I tried a 930-foot Beverage-on-Ground (BOG) and 
it did not work as well as my transmitting antenna which is a 43-foot 
vertical by 130-foot inverted-L.  The signals with the Inv-L were 
20-dB stronger (farthest Rx DX from Alaska is Buffalo, NY).  The 
Beverage is moot as my neighbor removed it when he needed access 
across where it lay (I had it run along side his private airstrip).

My next attempt for Rx antenna will be a shielded 6-foot diameter 
loop (rotatable) with preamp.  (600m DX season is Oct. - Mar.)  I run 
100w RF output on 495-KHz to the base-loaded Inv-L with about 0.8% 
antenna efficiency (hard to make a 1/4 WL vertical at 600meters - 492 
foot).  My 4.15w ERP signal has been heard in Vancouver, BC about 
1300 miles.  (lots of info on my website)

73, Ed - KL7UW
K3/10 with KRX3

--

Message: 21
Date: Tue, 12 Jul 2011 19:39:42 -0700 (PDT)
From: callen1155 callen1...@yahoo.com
Subject: Re: [Elecraft] KRX3 vs APF on weak signals ??
To: elecraft@mailman.qth.net
Message-ID: 1310524782325-6577528.p...@n2.nabble.com
Content-Type: text/plain; charset=us-ascii

Thanks for the responses but I'm at a loss as to why the question is
confusing. I'm trying to determine the most efficient method to hear
weak/fading cw signals.

I have read on here many times where folks brag on the 2nd receivers'
ability to overcome fading band conditions via diversity receive using
complementing antennas. I have read and experienced the benefit of APF under
those same band conditions as well.

I understand diversity receive and APF go about it two totally different
ways but the end result is an improved ability to hear weak/fading signals.

My question is simply, under weak/fading band conditions when you're
straining to copy the cw sig (assuming you have both APF and diversity
receive to choose from), which would you choose to improve your copy and
make the contact?

thanks again.
chuck




73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep dubus...@gmail.com
==

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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Ron D'Eau Claire]

And then there's diversity implemented at RF like all the older diversity
receivers used. 

In that case you cannot tell that diversity is being used, unless you have a
non-diversity receiver to compare the signal with in real time. The only
difference is that QSB is much reduced and, occasionally, the
signal-to-noise ratio is improved using diversity. 

I find the big advantage of an Audio Peaking Filter is to improve the
signal/noise ratio of a signal. Since it's a selective device, it may
occasionally reduce QRM. Reducing QRM is seldom a significant benefit in a
high-performance receiver, but can be very important in a receiver with
marginal I.F. selectivity.

Ron AC7AC



-Original Message-

Mike K2MK wrote:
 
 Diversity reception may not work for everybody. My brain can't handle it. 

I guess I'm the opposite.  I use diversity virtually all the time on
160M-20M.  Even when the rx antenna + subrx isn't necessarily making the
signal more readable, I find the stereo effect very pleasing to listen to.

73, Barry N1EU


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[Elecraft] KRX3 vs APF on weak signals ??

[callen1155]

Hello folks.

I operate cw 98% of the time.
After 'rag chewing' for several years I'm becoming more interested in
DX'ing. Also I'm eager to try my luck on 160 meters despite my QTH and
antenna restrictions.

I've been considering purchasing the KRX3 (second receiver) for a year or
more. 

However with the recent firmware upgrades and now the APF (audio peaking
filter) feature on the standard K3 I'm wondering if the second receivers
'diversity receive'  capability would be that much superior to the APF for
weak/fading signals?  

(My results vary using the APF; abort 1/3 of the time it helps, 1/3 of the
time I get  'clearer' copy with very narrow DSP bandwidth and no APF...  the
final 1/3 is a no copy either way.)

If the APF approaches the effectiveness of the KRX3 on weak/fading sigs I
may just go for a P3 instead.

Thanks for any advice.
chuck
AF4XK

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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Tony Estep]

On Tue, Jul 12, 2011 at 5:27 PM, callen1155 callen1...@yahoo.com wrote:

 ...I'm becoming more interested in DX'ingI've been considering
 purchasing the KRX3 (second receiver) ...

==
Chuck, the second receiver does more than just offer diversity. A lot of CW
DX is worked split, and it's tremendously helpful to be able to listen to
your xmit frequency in one ear and the DX in the other. The key is to track
down the guy he's working and position your signal so it's in the right
place at the right time. It's even more helpful if your station is modest,
as you imply when you mention antenna restrictions. I use split mode 100% of
the time, even if the DX is listening on his frequency. Being able to slide
to one side or the other can make all the difference. And BTW, if you have
two dissimilar antennas, diversity is really neat.

Tony KT0NY
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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Guy Olinger K2AV]

Your question reads like, Do I have enough rocks in this bucket, or
do I have more hammers in this bucket?

The APF does not do what diversity does for you.  APF is a monaural
concept.  Diversity allows you to spread the noise while signals
remain discreet.  This is something which your ears already do in
listening to a conversation in a crowded.  K3 diversity leaves
separation to your BRAIN, which is very good at it.

Also the second RX has many more uses besides diversity, but to
evaluate diversity, you need to go somewhere and HEAR diversity from a
dual RX K3.  Then you'll have the sensory answer to your question,
whether you decide to get it or not.

73, Guy.

On Tue, Jul 12, 2011 at 6:34 PM, Tony Estep estept...@gmail.com wrote:
 On Tue, Jul 12, 2011 at 5:27 PM, callen1155 callen1...@yahoo.com wrote:

 ...I'm becoming more interested in DX'ingI've been considering
 purchasing the KRX3 (second receiver) ...

 ==
 Chuck, the second receiver does more than just offer diversity. A lot of CW
 DX is worked split, and it's tremendously helpful to be able to listen to
 your xmit frequency in one ear and the DX in the other. The key is to track
 down the guy he's working and position your signal so it's in the right
 place at the right time. It's even more helpful if your station is modest,
 as you imply when you mention antenna restrictions. I use split mode 100% of
 the time, even if the DX is listening on his frequency. Being able to slide
 to one side or the other can make all the difference. And BTW, if you have
 two dissimilar antennas, diversity is really neat.

 Tony KT0NY
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Re: [Elecraft] KRX3 vs APF on weak signals ??

[callen1155]

Thanks for the responses but I'm at a loss as to why the question is
confusing. I'm trying to determine the most efficient method to hear
weak/fading cw signals.

I have read on here many times where folks brag on the 2nd receivers'
ability to overcome fading band conditions via diversity receive using
complementing antennas. I have read and experienced the benefit of APF under
those same band conditions as well.

I understand diversity receive and APF go about it two totally different
ways but the end result is an improved ability to hear weak/fading signals.

My question is simply, under weak/fading band conditions when you're
straining to copy the cw sig (assuming you have both APF and diversity
receive to choose from), which would you choose to improve your copy and
make the contact?

thanks again.
chuck 

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Re: [Elecraft] KRX3 vs APF on weak signals ??

[Lyle Johnson]

If it is signal to noise ratio is weak but steady, no QSB, then APF 
ought to do the trick if the CW speed is compatible with the APF 
bandwidth.  If it is a rotating signal through the ionosphere (QSB, 
fading), then diversity (including diversity */with/* APF enabled).

73,

Lyle KK7P

 ...

 My question is simply, under weak/fading band conditions when you're
 straining to copy the cw sig (assuming you have both APF and diversity
 receive to choose from), which would you choose to improve your copy and
 make the contact?

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Re: [Elecraft] KRX3 - filter

[Bruce Beford]

Hello, Johnny.
Yes, you can use a single 13 KHz filter in the KRX3 for all modes, you just
need to activate it for all modes using the K3 utility. Of course, you will
lose the benefits of narrower filters in crowded conditions.
73, Bruce, N1RX


 KRX3 is for receive only.  Is it possible to just use one KFL-3B FM filter
(without either 2.7 or 2.8Khz filter) to cover the 
 reception of SSB, AM and FM?  

 TNX  73,
 Johnny VR2XMC



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[Elecraft] KRX3 - filter

[Johnny Siu]

Hello Group,
 
KRX3 is for receive only.  Is it possible to just use one KFL-3B FM filter 
(without either 2.7 or 2.8Khz filter) to cover the reception of SSB, AM and 
FM?  

TNX  73,


Johnny VR2XMC
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Re: [Elecraft] KRX3 or P3 for CW DXing? [was: ZL8X - K3 firmware]

[John Harper]

If you'd like to peruse another set of opinions to the same Q, here they are:

http://www.ae5x.com/blog/2010/09/05/the-most-beneficial-k3-upgrade-panadapter-or-sub-reciever/


John Harper AE5X



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[Elecraft] KRX3 diversity receive

[VE3WDM]

I have installed the KRX3 and set it up with a separate antenna from Ant 3 at
the rear or the K3. The diversity antenna is a dipole and the main antenna
is a vertical. The meneu settings are as follows
1. ANT=BNC
2. KAYN3 has been calibrated. 
3. SPKRS is set to 2 as I use headphones. 
4. I used the K3 utility to download the latest firmware and the box was
checked for DSP2 and KRX3. 
 I am trying diversity for the first time today and I press and hold the sub
button. I get the LINK followed by DIVERSITY. In the manual it says once
this happens the sub and main are linked, that the sub is slave to the main.
When I turn the main VFO the sub does not follow as if it is linked. Is this
how it works or am I forgetting something?
Thanks 
Mike 
http://ve3wdm.blogspot.com http://ve3wdm.blogspot.com 
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Re: [Elecraft] KRX3 diversity receive

[Richard Ferch]

Mike,

When you say the sub does not follow, do you mean that if both VFOs are 
tuned to a signal and you then turn the VFO A knob away from the signal, 
the right channel still plays the same signal without change despite 
turning the tuning knob? or do you simply mean that the VFO B readout 
doesn't change, but the signals in the left and right channels both move 
with the tuning knob?

If it's just that the VFO B readout doesn't change, that's normal. In 
Diversity mode, both receivers are controlled by VFO A. The VFO B 
readout is the same as it would be in a single-receiver K3, and has 
nothing to do with the subRX in this mode.

There are two VFOs and there are two receivers in your K3, but there is 
not a one-to-one correspondence between VFOs and receivers. The main RX 
is always on VFO A, but the subRX may be on either VFO, depending on 
whether you are in DVRSTY mode or not. The transmitter may be on either 
VFO, depending on whether you are in SPLIT mode or not.

BTW, you do not need to set SPKRS to 2 unless you also have SPKR+PH set 
to Yes. In particular, do not set SPKRS to 2 if you have a mono speaker 
plug plugged into the rear panel speaker jack.

73,
Rich VE3KI


VE3WDM wrote:

  I am trying diversity for the first time today and I press and hold the sub
 button. I get the LINK followed by DIVERSITY. In the manual it says once
 this happens the sub and main are linked, that the sub is slave to the main.
 When I turn the main VFO the sub does not follow as if it is linked. Is this
 how it works or am I forgetting something?
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Re: [Elecraft] KRX3 diversity receive

[Don Wilhelm]

  Rich,

Just a comment on what you said here - ALWAYS use a stereo plug in the 
rear speaker jack.
Using a mono plug has been responsible for the demise of several K2 
audio amplifiers.
While this problem was supposed to be corrected with some resistor 
changes, I would advise all to take the conservative path and change the 
speaker plug for a stereo plug - of course, you would wire only to the 
tip and the shell, so it is still a mono connection, but the plug is a 
stereo type.  The open ring should not cause damage.

73,
Don W3FPR

On 10/11/2010 9:48 AM, Richard Ferch wrote:
   In particular, do not set SPKRS to 2 if you have a mono speaker
 plug plugged into the rear panel speaker jack.

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[Elecraft] KRX3

[Mike Weir]

I have had a chance to play with my new KRX3 and had a few questions. 
1. When listening to CW with the sub VFO I can't get the spot function to work 
with the sub, is that just not available yet?
2. While listening to one band on the main VFO and a different  band on the sub 
(not in diversity mode) every so often in the sub I get AUX ANT. I can't switch 
to that particular band unless I flip the band from the sub to the main and the 
main to the sub. Then all is well, is this the affect of the band pass filters 
the manual is talking about? If so I will just have to keep track of the band 
that is in the sub and main. 
Mike
http://ve3wdm.blogspot.com
  
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Re: [Elecraft] KRX3

[Don Wilhelm]

  Mike,

I don't know the answer to your #1 question, but the #2 question, the K3 
is telling you that you have the sub set to a band that is higher in 
frequency than the main RX.  When that is the case, you should be using 
the AUX antenna because the Low Pass Filters are set for the band the 
main has tuned (necessary for transmit), and will substantially 
attenuate the subRX input signal.

The solution is to either always set the sub to a band lower than the 
main or to use the sub's aux antenna input.

73,
Don W3FPR

On 9/28/2010 9:38 AM, Mike Weir wrote:
 I have had a chance to play with my new KRX3 and had a few questions.
 1. When listening to CW with the sub VFO I can't get the spot function to 
 work with the sub, is that just not available yet?
 2. While listening to one band on the main VFO and a different  band on the 
 sub (not in diversity mode) every so often in the sub I get AUX ANT. I can't 
 switch to that particular band unless I flip the band from the sub to the 
 main and the main to the sub. Then all is well, is this the affect of the 
 band pass filters the manual is talking about? If so I will just have to keep 
 track of the band that is in the sub and main.
 Mike
 http://ve3wdm.blogspot.com

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[Elecraft] KRX3

[Mike Weir]

Good morning all,
I have successfully installed the KRX3 in my K3 I now beginning the calibration 
procedures.  First it is the synthesizer, I entered CONFIG:VCO MD the only two 
parameters I can find are Nor 41 and RF 127. Any more rotation of the vfo knob 
changes the RF setting. I believe I am not able to find the CAL parameter as I 
have not set TECH MD to ON. But in rotating the VFO and changing some settings 
in either NOR or RF are these saved or does the rig have to be in TECH MD ON 
first? If they are saved does this mean I have to redo the synthesizer cal 
procedure for the K3 again?
Mike 
VE3WDM
http://ve3wdm.blogspot.com
  
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Re: [Elecraft] KRX3

[Don Wilhelm]

  Mike,

Yes, you will have to set TECH MD to ON as indicated in the manual.  Set 
the VCO MD to CAL and SUB and exit the menu, the operation is 
automatic.  The values you see are the result of the calibration.
You may turn TECH MD off after you finish the calibrations.

73,
Don W3FPR

On 9/27/2010 9:45 AM, Mike Weir wrote:
 Good morning all,
 I have successfully installed the KRX3 in my K3 I now beginning the 
 calibration procedures.  First it is the synthesizer, I entered CONFIG:VCO MD 
 the only two parameters I can find are Nor 41 and RF 127. Any more rotation 
 of the vfo knob changes the RF setting. I believe I am not able to find the 
 CAL parameter as I have not set TECH MD to ON. But in rotating the VFO and 
 changing some settings in either NOR or RF are these saved or does the rig 
 have to be in TECH MD ON first? If they are saved does this mean I have to 
 redo the synthesizer cal procedure for the K3 again?
 Mike
 VE3WDM
 http://ve3wdm.blogspot.com

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Re: [Elecraft] KRX3

[VE3WDM]

Don'
 Have I changed any of the synthesizer settings when I rotated the VFO knob
earlier and changed the RF settings. I was not sure if I also changed the
NOR setting in this menu either? But I hope with the MD setting to off
nothing was changed. 
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Re: [Elecraft] KRX3

[Don Wilhelm]

  Mike,

Read the manual menu chart of menu explanations and you will discover 
better than I can tell you.
If you set it back to NOR 127, then exit the menu and change bands, it 
will be restored to the prior settings.

Since the calibration is more or less automatic, I see no problem in 
re-doing the calibration, so (in TECH MODE) set it to CAL and exit the 
menu - it will be done.

73,
Don W3FPR

On 9/27/2010 10:02 AM, VE3WDM wrote:
 Don'
   Have I changed any of the synthesizer settings when I rotated the VFO knob
 earlier and changed the RF settings. I was not sure if I also changed the
 NOR setting in this menu either? But I hope with the MD setting to off
 nothing was changed.
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Re: [Elecraft] KRX3

[Guy Olinger K2AV]

I wonder if Mike was having trouble finding the rf cal position.  That
should be found by turning the VFO A knob CLOCKWISE from the NOR setting
that you find it on when you select VCO MD in the config menu.73, Guy.

On Mon, Sep 27, 2010 at 10:32 AM, Don Wilhelm w3...@embarqmail.com wrote:

  Mike,

 Read the manual menu chart of menu explanations and you will discover
 better than I can tell you.
 If you set it back to NOR 127, then exit the menu and change bands, it
 will be restored to the prior settings.

 Since the calibration is more or less automatic, I see no problem in
 re-doing the calibration, so (in TECH MODE) set it to CAL and exit the
 menu - it will be done.

 73,
 Don W3FPR

 On 9/27/2010 10:02 AM, VE3WDM wrote:
  Don'
Have I changed any of the synthesizer settings when I rotated the VFO
 knob
  earlier and changed the RF settings. I was not sure if I also changed the
  NOR setting in this menu either? But I hope with the MD setting to off
  nothing was changed.
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Re: [Elecraft] KRX3

[VE3WDM]

Don and Guy, Thanks very much for the help I re-did the synthesizer cal for
the main receiver and then did the sub receiver. I then went into the K3
utility and did the RF gain calibration for both main and sub receivers.Oh
and also entered the filter data for the sub as well. All is going FB and I
am just in the process of discovering the sub receiver.  
Thanks again for your time and help. 
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Re: [Elecraft] KRX3 band pass filters needed?

[VE3WDM]

Good Morning Don, The Dipole is in a two story townhouse and it is 90 degrees
in orientation to the vertical antenna. I would say the separation between
the two is about 40 to 50 feet. The vertical antenna is a High Sierra
sidekick located at ground level. I use it for CW at 50 to 100 watts.  I was
talking to Gary at Elecraft and he suggested others have used model 197 or
197  RF Limiter / receiver protect by Iceproducts. I will look into that too
and this COR relay is it a very noticeable clicking if it was to be
activated? 
Mike
VE3WDM
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Re: [Elecraft] KRX3 band pass filters needed?

[Vic K2VCO]

I missed the original message, but if the dipole is coax fed, a balun at the 
feedpoint 
will go a long way to reducing pickup from the vertical. Might even solve the 
problem 
entirely.

On 9/15/2010 3:28 AM, VE3WDM wrote:

 Good Morning Don, The Dipole is in a two story townhouse and it is 90 degrees
 in orientation to the vertical antenna. I would say the separation between
 the two is about 40 to 50 feet. The vertical antenna is a High Sierra
 sidekick located at ground level. I use it for CW at 50 to 100 watts.  I was
 talking to Gary at Elecraft and he suggested others have used model 197 or
 197  RF Limiter / receiver protect by Iceproducts. I will look into that too
 and this COR relay is it a very noticeable clicking if it was to be
 activated?
 Mike
 VE3WDM


-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] KRX3 band pass filters needed?

[Bill W4ZV]

VE3WDM wrote:
 
 
 Good evening all, just ordered the KRX3 for the K3. One thing I was going
 to use the KRX3 for was to hook my attic dipole to the KRX3  as it is a
 very quite receiving antenna. The main receiver was going out to my
 vertical. Do I need band pass filters not sure about this? 
 

The KRX3 has a full set of ham band band pass filters, so you don't need the
KBPF option unless you plan to use diversity outside the ham bands.  You'll
also need to duplicate (including any offsets for 5-pole filters) the exact
filter setup you have in your Main receiver. 

CAUTION:  Once you use true diversity, you'll never be happy with any rig
without it!

73,  Bill

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[Elecraft] KRX3 band pass filters needed?

[Mike Weir]

Good evening all, just ordered the KRX3 for the K3. One thing I was going to 
use the KRX3 for was to hook my attic dipole to the KRX3  as it is a very quite 
receiving antenna. The main receiver was going out to my vertical. Do I need 
band pass filters not sure about this? I would rather know first than pay the 
consequences later. 
Thanks for your time
Mike VE3WDM
http://ve3wdm.blogspot.com
  
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Re: [Elecraft] KRX3 band pass filters needed?

[Don Wilhelm]

  Mike,

You did not include the coupling factor information between your 
transmit antenna and the receiving antenna.
It depends on the physical separation of the antennas, the relative 
orientation, and a host of other factors that cannot be predicted 
without all the details.  An attic antenna in a one story house is 
different than in a two story house, and a vertical at one end of the 
gable for that house is different than a vertical located 200 feet away 
from the house.  Is the attic antenna a dipole oriented at 90 degrees 
from the direction of the vertical, or is the vertical more off the ends 
of the attic dipole.

No answer can be given until all details of that nature are available.  
The easy solution is to just try it and see.  If you hear the COR relay 
clicking, then you have a problem that needs to be solved.

73,
Don W3FPR

On 9/12/2010 7:00 PM, Mike Weir wrote:
 Good evening all, just ordered the KRX3 for the K3. One thing I was going to 
 use the KRX3 for was to hook my attic dipole to the KRX3  as it is a very 
 quite receiving antenna. The main receiver was going out to my vertical. Do I 
 need band pass filters not sure about this? I would rather know first than 
 pay the consequences later.
 Thanks for your time
 Mike VE3WDM
 http://ve3wdm.blogspot.com

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Re: [Elecraft] KRX3 band pass filters needed?

[Ron D'Eau Claire]

Mike, if you are talking about the crystal filters (a.k.a. I.F. filters,
Roofing Filters, etc.) the answer is 'yes'. The subrx RF path is completely
separate from the main rx so you'll need filters for the type of operating
and modes you want to receive. 

You'll need the KBPF3 bandpass filter for the subrx IF you want to tune
outside the Ham bands with optimum sensitivity. 

Ron AC7AC

-Original Message-
Good evening all, just ordered the KRX3 for the K3. One thing I was going to
use the KRX3 for was to hook my attic dipole to the KRX3  as it is a very
quite receiving antenna. The main receiver was going out to my vertical. Do
I need band pass filters not sure about this? I would rather know first than
pay the consequences later. 
Thanks for your time
Mike VE3WDM
http://ve3wdm.blogspot.com
 

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[Elecraft] KRX3 roofing filter matching for diversity receive

[Chuck Guenther]

Stan, you asked a good question-- one I asked about some time ago.
When I worked in the aerospace industry, I designed and used analog
and digital filters for measurement applications.  Most textbook design
formulas and procedures are based on 3 dB bandwidths, although sometimes
our measurement requirements demanded 0.5 dB bandwidth.

Amateur radio IF bandwidths seem to have been standardized at the 6dB
points.  If the filter designers are reporting 3 dB points, this might 
account for the
difference you asked about.  BTW, I just checked the INRAD website and 
looked
for the filter curves for the K3 roofing filters and couldn't find 
them.  They used to
be available there. 

73,
Chuck  NI0C
K2-10 s/n 5853  K3 s/n 1061


Stan Rife, W5EWA, wrote:
I'm not sure why a filter would be advertised as a 250hz filter but 
actually have
a (usable?) bandwidth of 370hz. Is this just a difference in how it's 
measured?  
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Re: [Elecraft] KRX3 roofing filter matching for diversity receive

[Richard Ferch]

W5EWA wrote:

   So is the information in the manual just the easy way to set it up,
 and you can actually put them in whatever slots you want?
From reading the manual I understood that they had to be in decending order
 starting from FL1, and the filters in both receivers had to match for
 diversity receive.

You should always follow the manual carefully. The manual says that 
filters should be in descending order of width, but they do not have to 
be in consecutive slots.

For example, in my main RX I have a 2.7 kHz in slot 2, a 500 kHz in slot 
4, and a 250 Hz (configured to switch in at 350 Hz) in slot 5. Slots 1 
and 3 are open. In the sub-RX I have 2.7 kHz and 500 Hz filters. I could 
have installed the sub-RX filters in slots 1 and 2, or 4 and 5, or 1 and 
5, or ..., but I chose to install them in slots 2 and 4 simply to reduce 
confusion.

For diversity receive, you should have similar filters in both 
receivers, e.g. matched pairs at the bandwidths you usually use during 
diversity receive. If the filters are 5-pole filters, the offsets should 
be matched as well. Note that during diversity receive, if the filters 
in each receiver are not identical (as in my case below 350 Hz widths) 
you may hear phase modulation, although in my case I can't say that this 
has ever been a serious problem - to me it sounds rather similar to the 
AFX feature.

There is one other restriction: if you plan to transmit in FM, you must 
have an FM filter in slot 1 on the main board.

73,
Rich VE3KI
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[Elecraft] KRX3 roofing filter matching for diversity receive

[bill4570]

Hi folks, 



  

I’m trying to configure the K3 receiver for diversity receive.    I’m 
populating the roofing filter slots in both receivers with matched filters, and 
the question came up:   When the K3 automatically selects the correct roofing 
filter to match DSP filter bandwidth, does the K3 do this by filter   
bandwidth, or by FLx number? 

  In other words; when I use the “width” control, and decrease DSP bandwidth 
from 3.0 Khz to 2.0 Khz on the front panel,   the K3 switches from the 2.8 Khz 
roofing filter located in FL3 to the 2.1 Khz roofing filter located in FL4.   
With the sub-receiver on, and in diversity receive, does the K3 switch the 
sub-receiver roofing filter from FL3 to FL4, like the main, or is it smart 
enough to know that my sub-receiver has it’s 2.8, and 2.1 Khz roofing filters 
in FL1 and FL2 respectively?    Does the K3 select the correct roofing filter 
by bandwidth, or by FLx number? Is the selection logic the same for main and 
sub-receiver? 



  

The KRX3 manual is a little foggy on this.   It says you have to have at least 
one roofing filter, and if that happens to be the KFL3B FM filter, it MUST be 
in the FL1 location.   It also says that you must have the widest bandwidth 
nearest FL1, but does not say it must be located at FL1. 



  

Bill,   W7QQ 
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Re: [Elecraft] KRX3 roofing filter matching for diversity receive

[Ed Muns]

Roofing filters are selected by either of two ways.  One is by directly
selecting FLx on the K3 front panel.  The other is by changing the DSP
bandwidth via WIDTH, LO CUT or HIGH CUT.  When the DSP bandwidth is
decreased to the crystal filter bandwidth, then that roofer is selected.
(Or, when the DSP increases beyond the current roofer's bandwidth, then the
next wider roofer is selected.)

It is important to note that the roofer bandwidth is specified by the user
in the K3 CONFIG menu, and you are not constrained to use either the
marketing bandwidth or the actual bandwidth of the filter.  You can put in
any bandwidth you want because all you are doing is telling the K3 what DSP
bandwidth to engage that particular crystal filter.

Most users specify the marketing bandwidth of the filter, e.g., 250 Hz for
the 250 Hz 8-pole filter.  So, as you decrease the DSP bandwidth and reach
250 Hz, that crystal filter will engage.  (Or, if you select FLx, then
crystal filter 'x' is selected and the DSP bandwidth is set to 250 Hz.)  But
you can specify 350 Hz, which is actually rational since the real bandwidth
of this filter is 370 Hz.  Some people even specify a wider DSP bandwidth
engagement point such as 400 or 450 Hz, because they want their crystal
filter bandwidth INSIDE the DSP bandwidth.

So, think about the relationship of the two filters (crystal and DSP), the
resultant cascade bandwidth of the two, the shape factor of the two filters,
and the passband shape.  Decide the DSP bandwidth at which you want your
particular crystal filters to engage.  There are arguments for keeping the
roofer wider than the DSP at all times and vice versa.  Remember that when
the DSP bandwidth is near the roofer's actual bandwidth, the cascade
bandwidth will be significantly less.  When one is much narrower than the
other then the narrow bandwidth dominates the IF bandwidth, but other RX
characteristics like IMD performance will be determined by the roofer
bandwidth.

Setting the DSP engagement bandwidths for your crystal filters affects both
the resultant IF passband width, shape and sound of the audio, as well as
the RX performance characteristics such as IMD.  If your head hurts thinking
about all this, just specify the bandwidth number in the part number of the
filter!  That is a good default and the radio will work great.  

Ed - W0YK
---
Ed Muns
Muns Vineyard - www.munsvineyard.com 
FaceBook - www.facebook.com/munsvineyard 

W7QQ wrote:
 I’m trying to configure the K3 receiver for diversity 
 receive.    I’m populating the roofing filter slots in both 
 receivers with matched filters, and the question came up:   
 When the K3 automatically selects the correct roofing filter 
 to match DSP filter bandwidth, does the K3 do this by filter  
  bandwidth, or by FLx number? 
 
   In other words; when I use the “width” control, and 
 decrease DSP bandwidth from 3.0 Khz to 2.0 Khz on the front 
 panel,   the K3 switches from the 2.8 Khz roofing filter 
 located in FL3 to the 2.1 Khz roofing filter located in FL4.  
  With the sub-receiver on, and in diversity receive, does the 
 K3 switch the sub-receiver roofing filter from FL3 to FL4, 
 like the main, or is it smart enough to know that my 
 sub-receiver has it’s 2.8, and 2.1 Khz roofing filters in FL1 
 and FL2 respectively?    Does the K3 select the correct 
 roofing filter by bandwidth, or by FLx number? Is the 
 selection logic the same for main and sub-receiver? 
 
 
 
   
 
 The KRX3 manual is a little foggy on this.   It says you have 
 to have at least one roofing filter, and if that happens to 
 be the KFL3B FM filter, it MUST be in the FL1 location.   It 
 also says that you must have the widest bandwidth nearest 
 FL1, but does not say it must be located at FL1. 

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Re: [Elecraft] KRX3 roofing filter matching for diversity receive

[Barry N1EU]

bill4570 wrote:
 
   In other words; when I use the “width” control, and decrease DSP
 bandwidth from 3.0 Khz to 2.0 Khz on the front panel,   the K3 switches
 from the 2.8 Khz roofing filter located in FL3 to the 2.1 Khz roofing
 filter located in FL4.   With the sub-receiver on, and in diversity
 receive, does the K3 switch the sub-receiver roofing filter from FL3 to
 FL4, like the main, or is it smart enough to know that my sub-receiver has
 it’s 2.8, and 2.1 Khz roofing filters in FL1 and FL2 respectively?    Does
 the K3 select the correct roofing filter by bandwidth, or by FLx number?
 Is the selection logic the same for main and sub-receiver? 
 
Is there some reason you don't want to put the main and subrx filters in
corresponding slots?

73,
Barry N1EU

-- 
View this message in context: 
http://n2.nabble.com/KRX3-roofing-filter-matching-for-diversity-receive-tp4200536p4200926.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KRX3 roofing filter matching for diversity receive

[Guy Olinger K2AV]

Bill, it's simpler than what you're looking for.  You can put your
widest filter in FL1 and install them from there in descending
bandwidth.  Use the K3 utility to set up the filters, much easier than
doing it with the config menu.  The radio automatically switches in
the matching filter that matches WIDTH going down.  This will be done
separately in each RX regardless of what filter slots were used. You
do not have to make slot assignments identical.

73, Guy.

On Mon, Dec 21, 2009 at 3:57 PM,  bill4...@comcast.net wrote:


 Hi folks,





 I’m trying to configure the K3 receiver for diversity receive.    I’m 
 populating the roofing filter slots in both receivers with matched filters, 
 and the question came up:   When the K3 automatically selects the correct 
 roofing filter to match DSP filter bandwidth, does the K3 do this by filter   
 bandwidth, or by FLx number?

   In other words; when I use the “width” control, and decrease DSP bandwidth 
 from 3.0 Khz to 2.0 Khz on the front panel,   the K3 switches from the 2.8 
 Khz roofing filter located in FL3 to the 2.1 Khz roofing filter located in 
 FL4.   With the sub-receiver on, and in diversity receive, does the K3 switch 
 the sub-receiver roofing filter from FL3 to FL4, like the main, or is it 
 smart enough to know that my sub-receiver has it’s 2.8, and 2.1 Khz roofing 
 filters in FL1 and FL2 respectively?    Does the K3 select the correct 
 roofing filter by bandwidth, or by FLx number? Is the selection logic the 
 same for main and sub-receiver?





 The KRX3 manual is a little foggy on this.   It says you have to have at 
 least one roofing filter, and if that happens to be the KFL3B FM filter, it 
 MUST be in the FL1 location.   It also says that you must have the widest 
 bandwidth nearest FL1, but does not say it must be located at FL1.





 Bill,   W7QQ
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Re: [Elecraft] KRX3 roofing filter matching for diversity receive

[srife]

H...   Ed, I almost tried using the built in
translator in Outlook...but then I recognized some of those words, like
is and the.  :-()  It almost let the smoke out of my head.

Seriously though, I don't understand the filter setup
technicalities. I can get through setting them up per the defaults in the
manual, but I would like to understand more about what you said. I'm not
sure why a filter would be advertised as a 250hz filter but actually have a
(usable?) bandwidth of 370hz. Is this just a difference in how it's
measured?

I have SN/0690 and am just now installing the KRX3. It arrived a few
months after the radio, back in mid to late 08, and I just never got around
to installing it. I have identical filters in both the main and sub receiver
(13khz, 6khz, 2.8  400 respecitively, with # 5 empty) so I can try out
diversity receive. I don't do much CW so didn't figure I needed a 250hz.

I'm sure I'll be asking some questions about this in short order,
once I get the rig back together. I am doing some of the mods and am
currently waiting on some parts and the REV C or D (or whatever it's up to
now) DSP board. 



Stan Rife 
W5EWA 


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ed Muns



Roofing filters are selected by either of two ways.  One is by directly
selecting FLx on the K3 front panel.  The other is by changing the DSP
bandwidth via WIDTH, LO CUT or HIGH CUT.  When the DSP bandwidth is
decreased to the crystal filter bandwidth, then that roofer is selected.
(Or, when the DSP increases beyond the current roofer's bandwidth, then the
next wider roofer is selected.)

It is important to note that the roofer bandwidth is specified by the user
in the K3 CONFIG menu, and you are not constrained to use either the
marketing bandwidth or the actual bandwidth of the filter.  You can put in
any bandwidth you want because all you are doing is telling the K3 what DSP
bandwidth to engage that particular crystal filter.

Most users specify the marketing bandwidth of the filter, e.g., 250 Hz for
the 250 Hz 8-pole filter.  So, as you decrease the DSP bandwidth and reach
250 Hz, that crystal filter will engage.  (Or, if you select FLx, then
crystal filter 'x' is selected and the DSP bandwidth is set to 250 Hz.)  But
you can specify 350 Hz, which is actually rational since the real bandwidth
of this filter is 370 Hz.  Some people even specify a wider DSP bandwidth
engagement point such as 400 or 450 Hz, because they want their crystal
filter bandwidth INSIDE the DSP bandwidth.

So, think about the relationship of the two filters (crystal and DSP), the
resultant cascade bandwidth of the two, the shape factor of the two filters,
and the passband shape.  Decide the DSP bandwidth at which you want your
particular crystal filters to engage.  There are arguments for keeping the
roofer wider than the DSP at all times and vice versa.  Remember that when
the DSP bandwidth is near the roofer's actual bandwidth, the cascade
bandwidth will be significantly less.  When one is much narrower than the
other then the narrow bandwidth dominates the IF bandwidth, but other RX
characteristics like IMD performance will be determined by the roofer
bandwidth.

Setting the DSP engagement bandwidths for your crystal filters affects both
the resultant IF passband width, shape and sound of the audio, as well as
the RX performance characteristics such as IMD.  If your head hurts thinking
about all this, just specify the bandwidth number in the part number of the
filter!  That is a good default and the radio will work great.  

Ed - W0YK

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Re: [Elecraft] KRX3 roofing filter matching for diversity receive

[srife]

So is the information in the manual just the easy way to set it up,
and you can actually put them in whatever slots you want?
From reading the manual I understood that they had to be in decending order
starting from FL1, and the filters in both receivers had to match for
diversity receive.

Stan Rife 
W5EWA 



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy Olinger K2AV
Sent: Monday, December 21, 2009 8:06 PM
To: bill4...@comcast.net
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KRX3 roofing filter matching for diversity receive

Bill, it's simpler than what you're looking for.  You can put your
widest filter in FL1 and install them from there in descending
bandwidth.  Use the K3 utility to set up the filters, much easier than
doing it with the config menu.  The radio automatically switches in
the matching filter that matches WIDTH going down.  This will be done
separately in each RX regardless of what filter slots were used. You
do not have to make slot assignments identical.

73, Guy.

On Mon, Dec 21, 2009 at 3:57 PM,  bill4...@comcast.net wrote:


 Hi folks,





 I’m trying to configure the K3 receiver for diversity receive.    I’m
populating the roofing filter slots in both receivers with matched filters,
and the question came up:   When the K3 automatically selects the correct
roofing filter to match DSP filter bandwidth, does the K3 do this by filter
  bandwidth, or by FLx number?

   In other words; when I use the “width” control, and decrease DSP
bandwidth from 3.0 Khz to 2.0 Khz on the front panel,   the K3 switches from
the 2.8 Khz roofing filter located in FL3 to the 2.1 Khz roofing filter
located in FL4.   With the sub-receiver on, and in diversity receive, does
the K3 switch the sub-receiver roofing filter from FL3 to FL4, like the
main, or is it smart enough to know that my sub-receiver has it’s 2.8, and
2.1 Khz roofing filters in FL1 and FL2 respectively?    Does the K3 select
the correct roofing filter by bandwidth, or by FLx number? Is the selection
logic the same for main and sub-receiver?





 The KRX3 manual is a little foggy on this.   It says you have to have at
least one roofing filter, and if that happens to be the KFL3B FM filter, it
MUST be in the FL1 location.   It also says that you must have the widest
bandwidth nearest FL1, but does not say it must be located at FL1.





 Bill,   W7QQ
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[Elecraft] KRX3 Diversity Antenna

[John Huffman]

I ordered the KRX3 today.  I've been reading the manual and have a question.

I have two antennas hooked to my K3.  Antenna 1 uses the internal ATU 
and is hooked to the ANT1 connector.  Antenna 2 is hooked to the ANT2 
connector on the K3, but does not use the ATU.

Using this setup on my Orion, I can listen to antenna 1 on the main 
receiver and antenna 2 on the sub receiver.

But, on the K3 it appears that I have to disconnect antenna 2 from the 
ANT2 connector and connect it to the AUX connector in order to get 
diversity receive.  That seems inconvenient.

Is there a way to put ANT1 on the main and ANT2 on the sub in the K3?  I 
don't relish the idea that I have to crawl around behind the radio in 
order to change connectors every time I want diversity receive.

73 de K1ESE
John
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Re: [Elecraft] KRX3 Diversity Antenna

[Iain MacDonnell - N6ML]

Hi John,

You may want to review the section in the K3 Owner's Manual entitled
Main and Sub Receiver Antenna Routing - specifically the sub section
K3 with KAT3 ATU. I believe it answers your question... ?

~Iain / N6ML


On Thu, Dec 3, 2009 at 2:35 PM, John Huffman hjo...@gmail.com wrote:
 I ordered the KRX3 today.  I've been reading the manual and have a question.

 I have two antennas hooked to my K3.  Antenna 1 uses the internal ATU
 and is hooked to the ANT1 connector.  Antenna 2 is hooked to the ANT2
 connector on the K3, but does not use the ATU.

 Using this setup on my Orion, I can listen to antenna 1 on the main
 receiver and antenna 2 on the sub receiver.

 But, on the K3 it appears that I have to disconnect antenna 2 from the
 ANT2 connector and connect it to the AUX connector in order to get
 diversity receive.  That seems inconvenient.

 Is there a way to put ANT1 on the main and ANT2 on the sub in the K3?  I
 don't relish the idea that I have to crawl around behind the radio in
 order to change connectors every time I want diversity receive.

 73 de K1ESE
 John
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[Elecraft] KRX3 + RX antenna

[Franki ON5ZO]

Group, forgive me if this has come up before (which it has has) but contest 
fever kicks in.
It seems that for the first time I have a kinda RX-antenna (solder still 
hot!).

If I want to listen to both the 80m vertical and the RX loop at the same 
time, is this all I need to do:
- set both receivers to the same frequency
- connect RX antenna to AUX RF BNC
- set KRX3 to Ant = BNC in the config menu

Is that all there is to it?
TNX / 73
- Franki ON5ZO = OQ5M in contest 

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