Re: [Elecraft] K3 Filter Attenuation Gain Make Up

[lstavenhagen]

Thanks for the info Ken. I was wondering about any detrimental effects of
those higher gain settings; now that I know nothing is wrong (sounds like
just a normal insertion loss with the narrow filter) I've backed mine down
to 3. 
I also put the new synthesizer in the rig and I honestly can't tell the
difference now between it and my K3S in terms of the receiver performance
and quietness. Now I just have to come up with the money to allow me to keep
the K3!

tnx es 73,
LS
W5QD



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[Elecraft] K3 Filter Attenuation Gain Make Up

[KJ Lopez]

Per Jim’s note below:

I recently upgraded to the new Synthesizers for my ancient K3 #951. 

I have 5 Pole 2.7s in both receivers, but multiple 8 Pole narrower filters as 
well as a 5 pole 200Hz that always was hard to listen to.  I read through the 
manual and Fred’s excellent K3 book and found that higher gain was not 
recommended.  I had 4dB or more gain on a few filters especially narrow CW.  I 
decided to experiment with lower gain settings. 

When I reduced the gain to 2-3 dB the “ringing” in the narrow filters reduced a 
LOT!  

That coupled with the new Synths has made the old K3 come to life all over 
again.  

It is truly amazing in pileups. Individual signals just pop out of the mess.  

Thanks to Howard at Elecraft for digging up old invoices with factory mods and 
updates.

And thanks to Elecraft for engineering such an amazing upgrade to an old radio!

Cheers,

Ken N6TZV

> 
> --
> 
> Message: 3
> Date: Fri, 26 Feb 2016 09:07:03 -0800
> From: Jim Brown 
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in
>   the passband
> Message-ID: <56d08637.5020...@audiosystemsgroup.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
> 
> On Fri,2/26/2016 8:50 AM, lstavenhagen wrote:
>> Quick question - do the 8 pole roofing filters have more attenuation, as a
>> general rule, in their passbands than the 5 pole?
> 
> Yes, but the difference doesn't matter -- it's in the IF, not the front 
> end. Further, there is an menu adjustment for each filter to equalize 
> the IF gain when switching between filters.
> 
> The advantage of 8-pole filters is smoother response in the passband of 
> wider filters, and steeper skirts. In general, roofing filters are only 
> needed for high QRM conditions like contesting. Their function is to 
> protect the DSP from overload by strong signals outside the desired 
> passband.  When the DSP IF is set to a bandwidth close to that of the 
> roofing filter, the two filters cascade to provide even steeper skirts. 
> Again, needed only under contest conditions.
> 
> It's amazing the things one can learn by reading the manual. :)
> 
> 73, Jim K9YC
> 
> 
> --
> 
> Message: 4
> Date: Fri, 26 Feb 2016 10:22:37 -0700 (MST)
> From: lstavenhagen 
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in
>   the passband
> Message-ID: <1456507357324-7614639.p...@n2.nabble.com>
> Content-Type: text/plain; charset=us-ascii
> 
> Well, yes, to spill the beans on this: it was when I was reviewing the filter
> gains on my K3 the other day that this came up. I built my K3 with the stock
> 2.7khz 5 pole filter in FL1 and an 8 pole 400hz in FL2 - however, to even
> out FL1 and FL2 requires the gain to be nearly maxed out for FL2 (8 db gain,
> IIRC). My K3S, however, has 8 pole 2.8khz and 400hz in goth FL1 and 2,
> respectively. But they're almost dead even in terms of attenuation with FL2
> set at only 2 db gain.
> 
> So that led me to wonder if the 5 pole in my K3 had less attenuation in
> general, accounting for the difference. Just a curiosity for me.
> 
> 73,
> LS
> W5QD
> 

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[Elecraft] K3 IF Attenuation?

[Dave C]

I've been using an AFEDRI SDR as a panadapter for my K3 for about a year
now using HDSDR.  I use it every day but when I powered things up
yesterday, the panadapter connection has suddenly experienced a lot of
attenuation.  I don't know at this point if the issue is in the K3 IF
output or the AFEDRI input.  The AFEDRI has adjustable RF gain and I can
still see the signals if I crank the RF gain to the max but I have lost on
the order of 20 dB in the IF connection.  (I normally run the AFEDRI with
about 20 dB of gain but I have to crank it up to 40 dB now to see the
signals from the K3).

I've tried rebooting things and checked the first layer of things like the
coax cable but I haven't found the cause of this big attenuation.  I went
into the K3 menu and toggled the KXV3 off and on but that didn't help
either.

Thought I would ask if anybody has experienced attenuation like this in the
K3's IF output.

Dave
K8JDC
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Re: [Elecraft] K3 IF Attenuation?

[Dave C]

I should have mentioned that the K3's receive level is normal.  Preamp is
off and attenuator is off.  S-meter levels on the K3 receiver are normal.
The problem I'm seeing is only in the IF connection.

Dave
K8JDC

On Sat, Nov 1, 2014 at 10:30 AM, Dave C k8j...@gmail.com wrote:

 I've been using an AFEDRI SDR as a panadapter for my K3 for about a year
 now using HDSDR.  I use it every day but when I powered things up
 yesterday, the panadapter connection has suddenly experienced a lot of
 attenuation.  I don't know at this point if the issue is in the K3 IF
 output or the AFEDRI input.  The AFEDRI has adjustable RF gain and I can
 still see the signals if I crank the RF gain to the max but I have lost on
 the order of 20 dB in the IF connection.  (I normally run the AFEDRI with
 about 20 dB of gain but I have to crank it up to 40 dB now to see the
 signals from the K3).

 I've tried rebooting things and checked the first layer of things like the
 coax cable but I haven't found the cause of this big attenuation.  I went
 into the K3 menu and toggled the KXV3 off and on but that didn't help
 either.

 Thought I would ask if anybody has experienced attenuation like this in
 the K3's IF output.

 Dave
 K8JDC

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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Cady, Fred]

You may both be right! I haven't checked my KPAK3AUX cable for actual wires but 
I bet there are 15 wires because I know that the pins not to be connected are 
snipped off in the DE15HD plug-end of the cable. 

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of iain macdonnell - N6ML
Sent: Thursday, August 01, 2013 10:00 PM
To: Ron D'Eau Claire
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

That's not what the KPA500 manual says :-

Elecraft K3 Cable Connections

This is available direct from Elecraft (pg 16): order KPAK3AUX . Pins not shown 
have no connection.

The table shows only 10 pins.

Elsewhere in the KPA500 manual, it is stated that pin 7 must not be connected 
to the K3.

I don't have a KPAK3AUX cable to test, as I made my own custom cables.

73,

~iain / N6ML



On Thu, Aug 1, 2013 at 7:51 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 The KPA3AUX cable DOES connect all 15 pins, Ian. It is simply a 
 straight-through cable, unlike a common VGA cable.

 If you want to use a separate PTT line (e.g. to route through some 
 other equipment that needs to control the amp, such as a Stepp-IR 
 controller) you need to use the Key Line Interrupter shown in Figure 2 
 that opens the PTT line in the DB15 cable.

 73 Ron AC7AC


 -Original Message-
 From: dse...@dseven.org [mailto:dse...@dseven.org] On Behalf Of iain 
 macdonnell - N6ML
 Sent: Thursday, August 01, 2013 7:01 PM
 To: Ron D'Eau Claire
 Cc: bwru...@gmail.com; Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Brian was referring to his cable lineup (quoted below).

 Brian, you do need two HD15 cables The point that Fred was making 
 is that one of them needs to be the Elecraft KPAK3AUX, whilst the 
 other one could be a straight-through cable with all 15 pins 
 connected. The KPAK3AUX does not connect all 15 pins, and that's 
 important. There is no harm in using two KPAK3AUX's, and that is 
 actually the safest configuration (cables designed for VGA monitor use will 
 not necessarily work).

 The KAT500 should tune when the KPA500 is in operate mode, though - 
 there is a specific configuration for that in the KAT500 Utility. On 
 the Configuration tab, click Edit Configuration..., then in the 
 Amplifier Key Interrupt Power tab , click Optimize for Elecraft KPA500.

 73,

 ~iain / N6ML



 On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 Where do you see two DB15 cables in a diagram Brian?

 Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net 
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. 
 Wruble
 Sent: Thursday, August 01, 2013 4:57 PM
 To: Cady, Fred
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 F
 red, thanks.  I am using that cable both places where my diagram says
 DB15 Cable.

 I guess I needed to have invested in only one.

 Everything seems to work, and the tuner protection works as well.  I 
 proved that by lowering K3 output power to 5 watts (just to be safe), 
 allowing the KPA500 to key and asking the KAT500 to re-tune.  it 
 refuses to do so.
 That is the right result.

 73,

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 
 and the KPA500. It can be between the K3 and the KAT or the KAT and 
 the KPA.  You can use a full DE15HD cable other places but the 
 KPAK3AUX cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in 
 Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here 
 is my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
 (DB15) On
 KAT500
   |
   And  | 
 ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on 
 KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Ron D'Eau Claire]

You are quite right Ian. All 15 pins are NOT used as shown in the KPA500
manual (Table 1, pg 4). What I should have said is that all of the lines
used are straight through. VGA cables are not wired that way. 

Pins 1, 4, 6, 7, and 8 are not used. IF you buy a straight-through 15 pin
cable, just break those pins off at the male connector. (That's what I did.)

73, Ron AC7AC

-Original Message-
From: dse...@dseven.org [mailto:dse...@dseven.org] On Behalf Of iain
macdonnell - N6ML
Sent: Thursday, August 01, 2013 9:00 PM
To: Ron D'Eau Claire
Cc: bwru...@gmail.com; Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

That's not what the KPA500 manual says :-

Elecraft K3 Cable Connections

This is available direct from Elecraft (pg 16): order KPAK3AUX . Pins not
shown have no connection.

The table shows only 10 pins.

Elsewhere in the KPA500 manual, it is stated that pin 7 must not be
connected to the K3.

I don't have a KPAK3AUX cable to test, as I made my own custom cables.

73,

~iain / N6ML



On Thu, Aug 1, 2013 at 7:51 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 The KPA3AUX cable DOES connect all 15 pins, Ian. It is simply a 
 straight-through cable, unlike a common VGA cable.

 If you want to use a separate PTT line (e.g. to route through some 
 other equipment that needs to control the amp, such as a Stepp-IR 
 controller) you need to use the Key Line Interrupter shown in Figure 2 
 that opens the PTT line in the DB15 cable.

 73 Ron AC7AC


 -Original Message-
 From: dse...@dseven.org [mailto:dse...@dseven.org] On Behalf Of iain 
 macdonnell - N6ML
 Sent: Thursday, August 01, 2013 7:01 PM
 To: Ron D'Eau Claire
 Cc: bwru...@gmail.com; Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Brian was referring to his cable lineup (quoted below).

 Brian, you do need two HD15 cables The point that Fred was making 
 is that one of them needs to be the Elecraft KPAK3AUX, whilst the 
 other one could be a straight-through cable with all 15 pins 
 connected. The KPAK3AUX does not connect all 15 pins, and that's 
 important. There is no harm in using two KPAK3AUX's, and that is 
 actually the safest configuration (cables designed for VGA monitor use
will not necessarily work).

 The KAT500 should tune when the KPA500 is in operate mode, though - 
 there is a specific configuration for that in the KAT500 Utility. On 
 the Configuration tab, click Edit Configuration..., then in the 
 Amplifier Key Interrupt Power tab , click Optimize for Elecraft
KPA500.

 73,

 ~iain / N6ML



 On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 Where do you see two DB15 cables in a diagram Brian?

 Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net 
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. 
 Wruble
 Sent: Thursday, August 01, 2013 4:57 PM
 To: Cady, Fred
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 F
 red, thanks.  I am using that cable both places where my diagram says
 DB15 Cable.

 I guess I needed to have invested in only one.

 Everything seems to work, and the tuner protection works as well.  I 
 proved that by lowering K3 output power to 5 watts (just to be safe), 
 allowing the
 KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.
 That is the right result.

 73,

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 
 and the KPA500. It can be between the K3 and the KAT or the KAT and 
 the KPA.  You can use a full DE15HD cable other places but the 
 KPAK3AUX cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in 
 Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here 
 is my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
 (DB15) On
 KAT500
   |
   And  | 
 ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15

[Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Brian F. Wruble]

Hi all:

I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.  The
K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.

I just noticed that received signals are down 4 S-units when the KPA500 is
in Operate.  In Standby, signals pop right up.

Reading past reflector emails on the topic, I found one thread that
suggested this may have to do with the state of the KPA500 PTT.  I found
that pulling the PTT RCA plug out ended the problem.

Then I replaced the PTT plug, and still had no problem.  However, once I
actually transmitted, and the PTT acted to key the KPA500, the problem
recurred  Low sigs when the amp is in Operate, Full sigs when in Standby.

Has anyone figured out a fix for this?

73 de Brian W3BW


*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278
__
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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Don Wilhelm]

Brian,

I have heard this before, and as I recall it has to do with the DB15 
cable and the PTT cable when used together.


Are you using the PTT cable in addition to the cable from the K3 ACC 
cable?  If so, pin 10 of the cable should not be included.  See the note 
on page 8 of the KAT500 manual.


Normally you would not have to use the PTT cable with the K3.  See pages 
3 and 4 of the KAT500 manual.  For this arrangement, piin 10 of the ACC 
cable must be present.


If you have other devices that need access ti the K3 Key Out line, you 
would use the PTT cable AND use the key line interrupter to disconnect 
pin 10 from the DB15 Interface cable without the need for removing pin 10. .


73,
Don W3FPR

On 8/1/2013 4:30 PM, Brian F. Wruble wrote:

Hi all:

I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.  The
K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.

I just noticed that received signals are down 4 S-units when the KPA500 is
in Operate.  In Standby, signals pop right up.

Reading past reflector emails on the topic, I found one thread that
suggested this may have to do with the state of the KPA500 PTT.  I found
that pulling the PTT RCA plug out ended the problem.

Then I replaced the PTT plug, and still had no problem.  However, once I
actually transmitted, and the PTT acted to key the KPA500, the problem
recurred  Low sigs when the amp is in Operate, Full sigs when in Standby.




__
Elecraft mailing list
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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Brian F. Wruble]

Hi Don,

Thanks for the prompt response.

Yes, I am using the DB15 and the PTT line.  I got it working.  Here is my
new cable lineup:




1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR (DB15) On
KAT500
  |
  And  |  ACC
on Navigator Interface


2.  RS232 on K3  XCVR (RS232) on P3


3.  PC on P3  RS232 on Navigator Interface


4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

5.  NO PTT LINE into KPA500 or into KAT500

6. No Key Line Interupter anyplace.


With this lineup, is the KAT500 protected from the KPA500 keying when the
KAT500 is tuning?

I must admit, I have mightily confused myself in this process.

Thanks again,

Brian W3BW



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

 Brian,

 I have heard this before, and as I recall it has to do with the DB15 cable
 and the PTT cable when used together.

 Are you using the PTT cable in addition to the cable from the K3 ACC
 cable?  If so, pin 10 of the cable should not be included.  See the note on
 page 8 of the KAT500 manual.

 Normally you would not have to use the PTT cable with the K3.  See pages 3
 and 4 of the KAT500 manual.  For this arrangement, piin 10 of the ACC cable
 must be present.

 If you have other devices that need access ti the K3 Key Out line, you
 would use the PTT cable AND use the key line interrupter to disconnect pin
 10 from the DB15 Interface cable without the need for removing pin 10. .

 73,
 Don W3FPR


 On 8/1/2013 4:30 PM, Brian F. Wruble wrote:

 Hi all:

 I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
  The
 K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.

 I just noticed that received signals are down 4 S-units when the KPA500 is
 in Operate.  In Standby, signals pop right up.

 Reading past reflector emails on the topic, I found one thread that
 suggested this may have to do with the state of the KPA500 PTT.  I found
 that pulling the PTT RCA plug out ended the problem.

 Then I replaced the PTT plug, and still had no problem.  However, once I
 actually transmitted, and the PTT acted to key the KPA500, the problem
 recurred  Low sigs when the amp is in Operate, Full sigs when in
 Standby.




__
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Cady, Fred]

Hi Brian,
Make sure you are using a KPAK3AUX cable somewhere between the K3 and the 
KPA500. It can be between the K3 and the KAT or the KAT and the KPA.  You can 
use a full DE15HD cable other places but the KPAK3AUX cable needs to be in 
there somewhere.
Cheers,
Fred KE7X
The Elecraft K3: Design, Configuration and Operation
The Elecraft KX3 - Going for the Summit
(soon - The Elecraft K-Line - KPA500 and KAT500)
 

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
Sent: Thursday, August 01, 2013 4:17 PM
To: d...@w3fpr.com
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

Hi Don,

Thanks for the prompt response.

Yes, I am using the DB15 and the PTT line.  I got it working.  Here is my new 
cable lineup:




1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR (DB15) On 
KAT500
  |
  And  |  ACC
on Navigator Interface


2.  RS232 on K3  XCVR (RS232) on P3


3.  PC on P3  RS232 on Navigator Interface


4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

5.  NO PTT LINE into KPA500 or into KAT500

6. No Key Line Interupter anyplace.


With this lineup, is the KAT500 protected from the KPA500 keying when the 
KAT500 is tuning?

I must admit, I have mightily confused myself in this process.

Thanks again,

Brian W3BW



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930 eFax  
305.768.0278







On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

 Brian,

 I have heard this before, and as I recall it has to do with the DB15 
 cable and the PTT cable when used together.

 Are you using the PTT cable in addition to the cable from the K3 ACC 
 cable?  If so, pin 10 of the cable should not be included.  See the 
 note on page 8 of the KAT500 manual.

 Normally you would not have to use the PTT cable with the K3.  See 
 pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10 of 
 the ACC cable must be present.

 If you have other devices that need access ti the K3 Key Out line, you 
 would use the PTT cable AND use the key line interrupter to disconnect 
 pin 10 from the DB15 Interface cable without the need for removing pin 10. .

 73,
 Don W3FPR


 On 8/1/2013 4:30 PM, Brian F. Wruble wrote:

 Hi all:

 I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
  The
 K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.

 I just noticed that received signals are down 4 S-units when the 
 KPA500 is in Operate.  In Standby, signals pop right up.

 Reading past reflector emails on the topic, I found one thread that 
 suggested this may have to do with the state of the KPA500 PTT.  I 
 found that pulling the PTT RCA plug out ended the problem.

 Then I replaced the PTT plug, and still had no problem.  However, 
 once I actually transmitted, and the PTT acted to key the KPA500, the 
 problem recurred  Low sigs when the amp is in Operate, Full sigs 
 when in Standby.




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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Don Wilhelm]

Brian,

Yes, the KAT500 is protected.  That is inherent in the K3 ACC (DB15) 
cable going first to the KAT500 and then to the KPA500 There is a 
Keyout-LP signal in the ACC cable to the KAT500 (and then onward to the 
KPA500).
The KAT500 interrupts that signal (to the KPA500) when the KAT500 needs 
to tune.
That Keyout-LP signal is what all the instructions about the DB15 pin 10 
concern themselves with.


73,
Don W3FPR

On 8/1/2013 6:16 PM, Brian F. Wruble wrote:

Hi Don,

Thanks for the prompt response.

Yes, I am using the DB15 and the PTT line.  I got it working.  Here is my
new cable lineup:




1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR (DB15) On
KAT500
   |
   And  |  ACC
on Navigator Interface


2.  RS232 on K3  XCVR (RS232) on P3


3.  PC on P3  RS232 on Navigator Interface


4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

5.  NO PTT LINE into KPA500 or into KAT500

6. No Key Line Interupter anyplace.


With this lineup, is the KAT500 protected from the KPA500 keying when the
KAT500 is tuning?

I must admit, I have mightily confused myself in this process.

Thanks again,

Brian W3BW



__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Brian F. Wruble]

F
red, thanks.  I am using that cable both places where my diagram says DB15
Cable.

I guess I needed to have invested in only one.

Everything seems to work, and the tuner protection works as well.  I proved
that by lowering K3 output power to 5 watts (just to be safe), allowing the
KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  That
is the right result.

73,

Brian



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and the
 KPA500. It can be between the K3 and the KAT or the KAT and the KPA.  You
 can use a full DE15HD cable other places but the KPAK3AUX cable needs to be
 in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here is my
 new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR (DB15) On
 KAT500
   |
   And  |  ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the DB15
  cable and the PTT cable when used together.
 
  Are you using the PTT cable in addition to the cable from the K3 ACC
  cable?  If so, pin 10 of the cable should not be included.  See the
  note on page 8 of the KAT500 manual.
 
  Normally you would not have to use the PTT cable with the K3.  See
  pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10 of
  the ACC cable must be present.
 
  If you have other devices that need access ti the K3 Key Out line, you
  would use the PTT cable AND use the key line interrupter to disconnect
  pin 10 from the DB15 Interface cable without the need for removing pin
 10. .
 
  73,
  Don W3FPR
 
 
  On 8/1/2013 4:30 PM, Brian F. Wruble wrote:
 
  Hi all:
 
  I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
   The
  K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.
 
  I just noticed that received signals are down 4 S-units when the
  KPA500 is in Operate.  In Standby, signals pop right up.
 
  Reading past reflector emails on the topic, I found one thread that
  suggested this may have to do with the state of the KPA500 PTT.  I
  found that pulling the PTT RCA plug out ended the problem.
 
  Then I replaced the PTT plug, and still had no problem.  However,
  once I actually transmitted, and the PTT acted to key the KPA500, the
  problem recurred  Low sigs when the amp is in Operate, Full sigs
  when in Standby.
 
 
 
 
 __
 Elecraft mailing list
 Home: http://mailman.qth.net/mailman/listinfo/elecraft
 Help: http://mailman.qth.net/mmfaq.htm
 Post: mailto:Elecraft@mailman.qth.net

 This list hosted by: http://www.qsl.net
 Please help support this email list: http://www.qsl.net/donate.html

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Help: http://mailman.qth.net/mmfaq.htm
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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Ron D'Eau Claire]

Where do you see two DB15 cables in a diagram Brian? 

Ron AC7AC

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
Sent: Thursday, August 01, 2013 4:57 PM
To: Cady, Fred
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

F
red, thanks.  I am using that cable both places where my diagram says DB15
Cable.

I guess I needed to have invested in only one.

Everything seems to work, and the tuner protection works as well.  I proved
that by lowering K3 output power to 5 watts (just to be safe), allowing the
KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  That
is the right result.

73,

Brian



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and 
 the KPA500. It can be between the K3 and the KAT or the KAT and the 
 KPA.  You can use a full DE15HD cable other places but the KPAK3AUX 
 cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here is 
 my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR 
 (DB15) On
 KAT500
   |
   And  |  ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when 
 the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the DB15 
  cable and the PTT cable when used together.
 
  Are you using the PTT cable in addition to the cable from the K3 ACC 
  cable?  If so, pin 10 of the cable should not be included.  See the 
  note on page 8 of the KAT500 manual.
 
  Normally you would not have to use the PTT cable with the K3.  See 
  pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10 
  of the ACC cable must be present.
 
  If you have other devices that need access ti the K3 Key Out line, 
  you would use the PTT cable AND use the key line interrupter to 
  disconnect pin 10 from the DB15 Interface cable without the need for 
  removing pin
 10. .
 
  73,
  Don W3FPR
 
 
  On 8/1/2013 4:30 PM, Brian F. Wruble wrote:
 
  Hi all:
 
  I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
   The
  K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.
 
  I just noticed that received signals are down 4 S-units when the
  KPA500 is in Operate.  In Standby, signals pop right up.
 
  Reading past reflector emails on the topic, I found one thread that 
  suggested this may have to do with the state of the KPA500 PTT.  I 
  found that pulling the PTT RCA plug out ended the problem.
 
  Then I replaced the PTT plug, and still had no problem.  However, 
  once I actually transmitted, and the PTT acted to key the KPA500, 
  the problem recurred  Low sigs when the amp is in Operate, Full 
  sigs when in Standby.
 
 
 
 
 __
 Elecraft mailing list
 Home: http://mailman.qth.net/mailman/listinfo/elecraft
 Help: http://mailman.qth.net/mmfaq.htm
 Post: mailto:Elecraft@mailman.qth.net

 This list hosted by: http://www.qsl.net Please help support this email 
 list: http://www.qsl.net/donate.html

__
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

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Please help support this email list: http://www.qsl.net

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[iain macdonnell - N6ML]

Brian was referring to his cable lineup (quoted below).

Brian, you do need two HD15 cables The point that Fred was making
is that one of them needs to be the Elecraft KPAK3AUX, whilst the
other one could be a straight-through cable with all 15 pins
connected. The KPAK3AUX does not connect all 15 pins, and that's
important. There is no harm in using two KPAK3AUX's, and that is
actually the safest configuration (cables designed for VGA monitor use
will not necessarily work).

The KAT500 should tune when the KPA500 is in operate mode, though -
there is a specific configuration for that in the KAT500 Utility. On
the Configuration tab, click Edit Configuration..., then in the
Amplifier Key Interrupt Power tab , click Optimize for Elecraft
KPA500.

73,

~iain / N6ML



On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 Where do you see two DB15 cables in a diagram Brian?

 Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:57 PM
 To: Cady, Fred
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 F
 red, thanks.  I am using that cable both places where my diagram says DB15
 Cable.

 I guess I needed to have invested in only one.

 Everything seems to work, and the tuner protection works as well.  I proved
 that by lowering K3 output power to 5 watts (just to be safe), allowing the
 KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  That
 is the right result.

 73,

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and
 the KPA500. It can be between the K3 and the KAT or the KAT and the
 KPA.  You can use a full DE15HD cable other places but the KPAK3AUX
 cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here is
 my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
 (DB15) On
 KAT500
   |
   And  |  ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when
 the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the DB15
  cable and the PTT cable when used together.
 
  Are you using the PTT cable in addition to the cable from the K3 ACC
  cable?  If so, pin 10 of the cable should not be included.  See the
  note on page 8 of the KAT500 manual.
 
  Normally you would not have to use the PTT cable with the K3.  See
  pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10
  of the ACC cable must be present.
 
  If you have other devices that need access ti the K3 Key Out line,
  you would use the PTT cable AND use the key line interrupter to
  disconnect pin 10 from the DB15 Interface cable without the need for
  removing pin
 10. .
 
  73,
  Don W3FPR
 
 
  On 8/1/2013 4:30 PM, Brian F. Wruble wrote:
 
  Hi all:
 
  I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
   The
  K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.
 
  I just noticed that received signals are down 4 S-units when the
  KPA500 is in Operate.  In Standby, signals pop right up.
 
  Reading past reflector emails on the topic, I found one thread that
  suggested this may have to do with the state of the KPA500 PTT.  I
  found that pulling the PTT RCA plug out ended the problem.
 
  Then I replaced the PTT

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Brian F. Wruble]

Figure 1, Page 4, KAT500 manual



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 9:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:

 Where do you see two DB15 cables in a diagram Brian?

 Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:57 PM
 To: Cady, Fred
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 F
 red, thanks.  I am using that cable both places where my diagram says DB15
 Cable.

 I guess I needed to have invested in only one.

 Everything seems to work, and the tuner protection works as well.  I proved
 that by lowering K3 output power to 5 watts (just to be safe), allowing the
 KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  That
 is the right result.

 73,

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

  Hi Brian,
  Make sure you are using a KPAK3AUX cable somewhere between the K3 and
  the KPA500. It can be between the K3 and the KAT or the KAT and the
  KPA.  You can use a full DE15HD cable other places but the KPAK3AUX
  cable needs to be in there somewhere.
  Cheers,
  Fred KE7X
  The Elecraft K3: Design, Configuration and Operation
  The Elecraft KX3 - Going for the Summit
  (soon - The Elecraft K-Line - KPA500 and KAT500)
 
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net [mailto:
  elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
  Sent: Thursday, August 01, 2013 4:17 PM
  To: d...@w3fpr.com
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate
 
  Hi Don,
 
  Thanks for the prompt response.
 
  Yes, I am using the DB15 and the PTT line.  I got it working.  Here is
  my new cable lineup:
 
 
 
 
  1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
  (DB15) On
  KAT500
|
And  | 
 ACC
  on Navigator Interface
 
 
  2.  RS232 on K3  XCVR (RS232) on P3
 
 
  3.  PC on P3  RS232 on Navigator Interface
 
 
  4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500
 
  5.  NO PTT LINE into KPA500 or into KAT500
 
  6. No Key Line Interupter anyplace.
 
 
  With this lineup, is the KAT500 protected from the KPA500 keying when
  the
  KAT500 is tuning?
 
  I must admit, I have mightily confused myself in this process.
 
  Thanks again,
 
  Brian W3BW
 
 
 
  *Brian F. Wruble, C.F.A.
 
  *70 is the new 40.*
  *
  Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
  Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
  21930 eFax  305.768.0278
 
 
 
 
 
 
 
  On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com
 wrote:
 
   Brian,
  
   I have heard this before, and as I recall it has to do with the DB15
   cable and the PTT cable when used together.
  
   Are you using the PTT cable in addition to the cable from the K3 ACC
   cable?  If so, pin 10 of the cable should not be included.  See the
   note on page 8 of the KAT500 manual.
  
   Normally you would not have to use the PTT cable with the K3.  See
   pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10
   of the ACC cable must be present.
  
   If you have other devices that need access ti the K3 Key Out line,
   you would use the PTT cable AND use the key line interrupter to
   disconnect pin 10 from the DB15 Interface cable without the need for
   removing pin
  10. .
  
   73,
   Don W3FPR
  
  
   On 8/1/2013 4:30 PM, Brian F. Wruble wrote:
  
   Hi all:
  
   I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
The
   K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.
  
   I just noticed that received signals are down 4 S-units when the
   KPA500 is in Operate.  In Standby, signals pop right up.
  
   Reading past reflector emails on the topic, I found one thread that
   suggested this may have to do with the state of the KPA500 PTT.  I
   found that pulling the PTT RCA plug out ended the problem.
  
   Then I replaced the PTT plug, and still had no problem.  However,
   once I actually transmitted, and the PTT acted to key the KPA500,
   the problem recurred  Low sigs when the amp is in Operate, Full
   sigs when in Standby.
  
  
  
  
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  Elecraft mailing list
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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Brian F. Wruble]

Got it. Thanks.

Figure 1 in the KAT500 manual leads one to believe that both cables need to
be KPAK3AUX, as both DB15 cables in the diagram are labeled 3, and one of
the cables has the warning not to use a standard VGA cable.  The note, 3
also suggests 2 of that particular Elecraft cable.  An obvious conclusion
--- though wrong --- is that both need to be the same, and both could be
the special Elecraft (KPAK3AUX) cable or a modified VGA cable to be the
same as the KPAK3AUX..

My understanding on the tuner issue was that the KAT500 could be damaged by
going through a retune cycle at high power.  Thus, some kind of safety
lockout is needed to prevent that.  If I can configure the KAT500 to tune
when the KPA500 is in operate mode, how do I prevent that kind of damage
from occurring?

Brian



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 10:00 PM, iain macdonnell - N6ML a...@dseven.orgwrote:

 Brian was referring to his cable lineup (quoted below).

 Brian, you do need two HD15 cables The point that Fred was making
 is that one of them needs to be the Elecraft KPAK3AUX, whilst the
 other one could be a straight-through cable with all 15 pins
 connected. The KPAK3AUX does not connect all 15 pins, and that's
 important. There is no harm in using two KPAK3AUX's, and that is
 actually the safest configuration (cables designed for VGA monitor use
 will not necessarily work).

 The KAT500 should tune when the KPA500 is in operate mode, though -
 there is a specific configuration for that in the KAT500 Utility. On
 the Configuration tab, click Edit Configuration..., then in the
 Amplifier Key Interrupt Power tab , click Optimize for Elecraft
 KPA500.

 73,

 ~iain / N6ML



 On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
  Where do you see two DB15 cables in a diagram Brian?
 
  Ron AC7AC
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net
  [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
  Sent: Thursday, August 01, 2013 4:57 PM
  To: Cady, Fred
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate
 
  F
  red, thanks.  I am using that cable both places where my diagram says
 DB15
  Cable.
 
  I guess I needed to have invested in only one.
 
  Everything seems to work, and the tuner protection works as well.  I
 proved
  that by lowering K3 output power to 5 watts (just to be safe), allowing
 the
  KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.
  That
  is the right result.
 
  73,
 
  Brian
 
 
 
  *Brian F. Wruble, C.F.A.
 
  *70 is the new 40.*
  *
  Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
  Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
  eFax  305.768.0278
 
 
 
 
 
 
 
  On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu
 wrote:
 
  Hi Brian,
  Make sure you are using a KPAK3AUX cable somewhere between the K3 and
  the KPA500. It can be between the K3 and the KAT or the KAT and the
  KPA.  You can use a full DE15HD cable other places but the KPAK3AUX
  cable needs to be in there somewhere.
  Cheers,
  Fred KE7X
  The Elecraft K3: Design, Configuration and Operation
  The Elecraft KX3 - Going for the Summit
  (soon - The Elecraft K-Line - KPA500 and KAT500)
 
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net [mailto:
  elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
  Sent: Thursday, August 01, 2013 4:17 PM
  To: d...@w3fpr.com
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate
 
  Hi Don,
 
  Thanks for the prompt response.
 
  Yes, I am using the DB15 and the PTT line.  I got it working.  Here is
  my new cable lineup:
 
 
 
 
  1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
  (DB15) On
  KAT500
|
And  | 
 ACC
  on Navigator Interface
 
 
  2.  RS232 on K3  XCVR (RS232) on P3
 
 
  3.  PC on P3  RS232 on Navigator Interface
 
 
  4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500
 
  5.  NO PTT LINE into KPA500 or into KAT500
 
  6. No Key Line Interupter anyplace.
 
 
  With this lineup, is the KAT500 protected from the KPA500 keying when
  the
  KAT500 is tuning?
 
  I must admit, I have mightily confused myself in this process.
 
  Thanks again,
 
  Brian W3BW
 
 
 
  *Brian F. Wruble, C.F.A.
 
  *70 is the new 40.*
  *
  Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
  Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
  21930 eFax  305.768.0278
 
 
 
 
 
 
 
  On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com
 wrote:
 
   Brian,
  
   I have heard this before, and as I recall

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Dick Dievendorff]

Brian, please also visit the KAT500 Utility's Edit Configuration page and
check that you've clicked the button that says Optimize for KPA500 if you
have a KPA500.  With that info, the KAT500 can interrupt the KPA500's key
line whenever it needs to in order to tune.

73 de Dick, K6KR


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
Sent: Thursday, August 01, 2013 16:57 PM
To: Cady, Fred
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

F
red, thanks.  I am using that cable both places where my diagram says DB15
Cable.

I guess I needed to have invested in only one.

Everything seems to work, and the tuner protection works as well.  I proved
that by lowering K3 output power to 5 watts (just to be safe), allowing the
KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  That
is the right result.

73,

Brian



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and 
 the KPA500. It can be between the K3 and the KAT or the KAT and the 
 KPA.  You can use a full DE15HD cable other places but the KPAK3AUX 
 cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here is 
 my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR 
 (DB15) On
 KAT500
   |
   And  |  ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when 
 the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the DB15 
  cable and the PTT cable when used together.
 
  Are you using the PTT cable in addition to the cable from the K3 ACC 
  cable?  If so, pin 10 of the cable should not be included.  See the 
  note on page 8 of the KAT500 manual.
 
  Normally you would not have to use the PTT cable with the K3.  See 
  pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10 
  of the ACC cable must be present.
 
  If you have other devices that need access ti the K3 Key Out line, 
  you would use the PTT cable AND use the key line interrupter to 
  disconnect pin 10 from the DB15 Interface cable without the need for 
  removing pin
 10. .
 
  73,
  Don W3FPR
 
 
  On 8/1/2013 4:30 PM, Brian F. Wruble wrote:
 
  Hi all:
 
  I am running a newly assembled K-Line --- K3/100, KPA500 and KAT500.
   The
  K3 is pretty loaded with KRX3, KAT3, KXV3A, etc.
 
  I just noticed that received signals are down 4 S-units when the
  KPA500 is in Operate.  In Standby, signals pop right up.
 
  Reading past reflector emails on the topic, I found one thread that 
  suggested this may have to do with the state of the KPA500 PTT.  I 
  found that pulling the PTT RCA plug out ended the problem.
 
  Then I replaced the PTT plug, and still had no problem.  However, 
  once I actually transmitted, and the PTT acted to key the KPA500, 
  the problem recurred  Low sigs when the amp is in Operate, Full 
  sigs when in Standby.
 
 
 
 
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Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[iain macdonnell - N6ML]

Hi Brian,

When the KAT500 is tuning, it breaks the keying line (one of the pins
in the HD15 connector) going to the KPA500, so the amp will be unkeyed
during tuning, and then keyed again when tuning completes. Some amps
cannot handle keying being interrupted while they are making power
(known as hot-switching), so the KAT500 is setup by default to not
interrupt keying if it detects a high power level, but the KPA500 does
not have that problem, so you can reconfigure the kAT500 using the
utility as described.

73,

~iain / N6ML


On Thu, Aug 1, 2013 at 7:12 PM, Brian F. Wruble bwru...@gmail.com wrote:
 Got it. Thanks.

 Figure 1 in the KAT500 manual leads one to believe that both cables need to
 be KPAK3AUX, as both DB15 cables in the diagram are labeled 3, and one of
 the cables has the warning not to use a standard VGA cable.  The note, 3
 also suggests 2 of that particular Elecraft cable.  An obvious conclusion
 --- though wrong --- is that both need to be the same, and both could be the
 special Elecraft (KPAK3AUX) cable or a modified VGA cable to be the same as
 the KPAK3AUX..

 My understanding on the tuner issue was that the KAT500 could be damaged by
 going through a retune cycle at high power.  Thus, some kind of safety
 lockout is needed to prevent that.  If I can configure the KAT500 to tune
 when the KPA500 is in operate mode, how do I prevent that kind of damage
 from occurring?

 Brian



 *Brian F. Wruble, C.F.A.

 70 is the new 40.

 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 10:00 PM, iain macdonnell - N6ML a...@dseven.org
 wrote:

 Brian was referring to his cable lineup (quoted below).

 Brian, you do need two HD15 cables The point that Fred was making
 is that one of them needs to be the Elecraft KPAK3AUX, whilst the
 other one could be a straight-through cable with all 15 pins
 connected. The KPAK3AUX does not connect all 15 pins, and that's
 important. There is no harm in using two KPAK3AUX's, and that is
 actually the safest configuration (cables designed for VGA monitor use
 will not necessarily work).

 The KAT500 should tune when the KPA500 is in operate mode, though -
 there is a specific configuration for that in the KAT500 Utility. On
 the Configuration tab, click Edit Configuration..., then in the
 Amplifier Key Interrupt Power tab , click Optimize for Elecraft
 KPA500.

 73,

 ~iain / N6ML



 On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
  Where do you see two DB15 cables in a diagram Brian?
 
  Ron AC7AC
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net
  [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
  Sent: Thursday, August 01, 2013 4:57 PM
  To: Cady, Fred
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate
 
  F
  red, thanks.  I am using that cable both places where my diagram says
  DB15
  Cable.
 
  I guess I needed to have invested in only one.
 
  Everything seems to work, and the tuner protection works as well.  I
  proved
  that by lowering K3 output power to 5 watts (just to be safe), allowing
  the
  KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.
  That
  is the right result.
 
  73,
 
  Brian
 
 
 
  *Brian F. Wruble, C.F.A.
 
  *70 is the new 40.*
  *
  Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
  Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
  eFax  305.768.0278
 
 
 
 
 
 
 
  On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu
  wrote:
 
  Hi Brian,
  Make sure you are using a KPAK3AUX cable somewhere between the K3 and
  the KPA500. It can be between the K3 and the KAT or the KAT and the
  KPA.  You can use a full DE15HD cable other places but the KPAK3AUX
  cable needs to be in there somewhere.
  Cheers,
  Fred KE7X
  The Elecraft K3: Design, Configuration and Operation
  The Elecraft KX3 - Going for the Summit
  (soon - The Elecraft K-Line - KPA500 and KAT500)
 
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net [mailto:
  elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
  Sent: Thursday, August 01, 2013 4:17 PM
  To: d...@w3fpr.com
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate
 
  Hi Don,
 
  Thanks for the prompt response.
 
  Yes, I am using the DB15 and the PTT line.  I got it working.  Here is
  my new cable lineup:
 
 
 
 
  1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
  (DB15) On
  KAT500
|
And  | 
  ACC
  on Navigator Interface
 
 
  2.  RS232 on K3  XCVR (RS232) on P3
 
 
  3.  PC on P3  RS232 on Navigator Interface
 
 
  4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500
 
  5

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Cady, Fred]

Pin 10, in the K3 ACC is the Key Out line that goes first to the KAT500 in the 
KPAK3AUX cable and then on to the KPA in the second DB15 cable. When the KAT 
institutes a tune cycle, it opens that line so it is interrupted from going 
onto the KPA. Thus the amp won't be keyed and putting out power when the KAT is 
tuning. The Amplifier key Interrupt power configuration in the KAT is there 
because in some amplifiers (somebody may be using the KAT with a brand X amp) 
you cannot interrupt the amp's keying line at more than a certain power output 
without damaging the amp. So the KAT is delivered with that interrupt power set 
at 29 watts (I think). If the power coming into the KAT is more than that when 
the KAT wants to tune, it won't open the keying line to save damaging the amp 
but that, of course, could damage the KAT. So, because the KPA can be operating 
at full power out and won't suffer any damage by opening its keying line, you 
should configure the KAT as Ian says to optimize i
 t for the KPA500.

Cheers,
Fred KE7X


Fred Cady
fcady at ieee dot org
 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:elecraft-
 boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 8:13 PM
 To: iain macdonnell - N6ML
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Got it. Thanks.

 Figure 1 in the KAT500 manual leads one to believe that both cables
 need to
 be KPAK3AUX, as both DB15 cables in the diagram are labeled 3, and
 one of
 the cables has the warning not to use a standard VGA cable.  The note,
 3
 also suggests 2 of that particular Elecraft cable.  An obvious
 conclusion
 --- though wrong --- is that both need to be the same, and both could
 be
 the special Elecraft (KPAK3AUX) cable or a modified VGA cable to be the
 same as the KPAK3AUX..

 My understanding on the tuner issue was that the KAT500 could be
 damaged by
 going through a retune cycle at high power.  Thus, some kind of safety
 lockout is needed to prevent that.  If I can configure the KAT500 to
 tune
 when the KPA500 is in operate mode, how do I prevent that kind of
 damage
 from occurring?

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930
 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 10:00 PM, iain macdonnell - N6ML
 a...@dseven.orgwrote:

  Brian was referring to his cable lineup (quoted below).
 
  Brian, you do need two HD15 cables The point that Fred was making
  is that one of them needs to be the Elecraft KPAK3AUX, whilst the
  other one could be a straight-through cable with all 15 pins
  connected. The KPAK3AUX does not connect all 15 pins, and that's
  important. There is no harm in using two KPAK3AUX's, and that is
  actually the safest configuration (cables designed for VGA monitor
 use
  will not necessarily work).
 
  The KAT500 should tune when the KPA500 is in operate mode, though -
  there is a specific configuration for that in the KAT500 Utility. On
  the Configuration tab, click Edit Configuration..., then in the
  Amplifier Key Interrupt Power tab , click Optimize for Elecraft
  KPA500.
 
  73,
 
  ~iain / N6ML
 
 
 
  On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz
 wrote:
   Where do you see two DB15 cables in a diagram Brian?
  
   Ron AC7AC
  
   -Original Message-
   From: elecraft-boun...@mailman.qth.net
   [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F.
 Wruble
   Sent: Thursday, August 01, 2013 4:57 PM
   To: Cady, Fred
   Cc: Elecraft Reflector
   Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in
 Operate
  
   F
   red, thanks.  I am using that cable both places where my diagram
 says
  DB15
   Cable.
  
   I guess I needed to have invested in only one.
  
   Everything seems to work, and the tuner protection works as well.
 I
  proved
   that by lowering K3 output power to 5 watts (just to be safe),
 allowing
  the
   KPA500 to key and asking the KAT500 to re-tune.  it refuses to do
 so.
   That
   is the right result.
  
   73,
  
   Brian
  
  
  
   *Brian F. Wruble, C.F.A.
  
   *70 is the new 40.*
   *
   Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
   Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930
   eFax  305.768.0278
  
  
  
  
  
  
  
   On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu
  wrote:
  
   Hi Brian,
   Make sure you are using a KPAK3AUX cable somewhere between the K3
 and
   the KPA500. It can be between the K3 and the KAT or the KAT and
 the
   KPA.  You can use a full DE15HD cable other places but the
 KPAK3AUX
   cable needs to be in there somewhere.
   Cheers,
   Fred KE7X
   The Elecraft K3: Design, Configuration and Operation
   The Elecraft KX3 - Going for the Summit
   (soon - The Elecraft K-Line - KPA500 and KAT500

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Dick Dievendorff]

The KAT500 needs to be able to interrupt the KPA500 key line in order to
tune with exciter power.  One 15-pin cable runs from the K3 to the KAT500,
and another runs from the KAT500 to the KPA500.  This diagram is in the
KAT500 owner's manual.

73 de Dick, K6KR


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
Sent: Thursday, August 01, 2013 19:13 PM
To: iain macdonnell - N6ML
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

Got it. Thanks.

Figure 1 in the KAT500 manual leads one to believe that both cables need to
be KPAK3AUX, as both DB15 cables in the diagram are labeled 3, and one of
the cables has the warning not to use a standard VGA cable.  The note, 3
also suggests 2 of that particular Elecraft cable.  An obvious conclusion
--- though wrong --- is that both need to be the same, and both could be the
special Elecraft (KPAK3AUX) cable or a modified VGA cable to be the same as
the KPAK3AUX..

My understanding on the tuner issue was that the KAT500 could be damaged by
going through a retune cycle at high power.  Thus, some kind of safety
lockout is needed to prevent that.  If I can configure the KAT500 to tune
when the KPA500 is in operate mode, how do I prevent that kind of damage
from occurring?

Brian



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 10:00 PM, iain macdonnell - N6ML
a...@dseven.orgwrote:

 Brian was referring to his cable lineup (quoted below).

 Brian, you do need two HD15 cables The point that Fred was making 
 is that one of them needs to be the Elecraft KPAK3AUX, whilst the 
 other one could be a straight-through cable with all 15 pins 
 connected. The KPAK3AUX does not connect all 15 pins, and that's 
 important. There is no harm in using two KPAK3AUX's, and that is 
 actually the safest configuration (cables designed for VGA monitor use 
 will not necessarily work).

 The KAT500 should tune when the KPA500 is in operate mode, though - 
 there is a specific configuration for that in the KAT500 Utility. On 
 the Configuration tab, click Edit Configuration..., then in the 
 Amplifier Key Interrupt Power tab , click Optimize for Elecraft 
 KPA500.

 73,

 ~iain / N6ML



 On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
  Where do you see two DB15 cables in a diagram Brian?
 
  Ron AC7AC
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net 
  [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. 
  Wruble
  Sent: Thursday, August 01, 2013 4:57 PM
  To: Cady, Fred
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in 
  Operate
 
  F
  red, thanks.  I am using that cable both places where my diagram 
  says
 DB15
  Cable.
 
  I guess I needed to have invested in only one.
 
  Everything seems to work, and the tuner protection works as well.  I
 proved
  that by lowering K3 output power to 5 watts (just to be safe), 
  allowing
 the
  KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.
  That
  is the right result.
 
  73,
 
  Brian
 
 
 
  *Brian F. Wruble, C.F.A.
 
  *70 is the new 40.*
  *
  Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
  Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 
  21930 eFax  305.768.0278
 
 
 
 
 
 
 
  On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu
 wrote:
 
  Hi Brian,
  Make sure you are using a KPAK3AUX cable somewhere between the K3 
  and the KPA500. It can be between the K3 and the KAT or the KAT and 
  the KPA.  You can use a full DE15HD cable other places but the 
  KPAK3AUX cable needs to be in there somewhere.
  Cheers,
  Fred KE7X
  The Elecraft K3: Design, Configuration and Operation
  The Elecraft KX3 - Going for the Summit
  (soon - The Elecraft K-Line - KPA500 and KAT500)
 
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net [mailto:
  elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
  Sent: Thursday, August 01, 2013 4:17 PM
  To: d...@w3fpr.com
  Cc: Elecraft Reflector
  Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in 
  Operate
 
  Hi Don,
 
  Thanks for the prompt response.
 
  Yes, I am using the DB15 and the PTT line.  I got it working.  Here 
  is my new cable lineup:
 
 
 
 
  1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
  (DB15) On
  KAT500
|
And  | 
 ACC
  on Navigator Interface
 
 
  2.  RS232 on K3  XCVR (RS232) on P3
 
 
  3.  PC on P3  RS232 on Navigator Interface
 
 
  4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on 
  KPA500
 
  5.  NO PTT LINE into KPA500 or into KAT500
 
  6

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Ron D'Eau Claire]

The KPA3AUX cable DOES connect all 15 pins, Ian. It is simply a
straight-through cable, unlike a common VGA cable. 

If you want to use a separate PTT line (e.g. to route through some other
equipment that needs to control the amp, such as a Stepp-IR controller) you
need to use the Key Line Interrupter shown in Figure 2 that opens the PTT
line in the DB15 cable. 

73 Ron AC7AC


-Original Message-
From: dse...@dseven.org [mailto:dse...@dseven.org] On Behalf Of iain
macdonnell - N6ML
Sent: Thursday, August 01, 2013 7:01 PM
To: Ron D'Eau Claire
Cc: bwru...@gmail.com; Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

Brian was referring to his cable lineup (quoted below).

Brian, you do need two HD15 cables The point that Fred was making is
that one of them needs to be the Elecraft KPAK3AUX, whilst the other one
could be a straight-through cable with all 15 pins connected. The KPAK3AUX
does not connect all 15 pins, and that's important. There is no harm in
using two KPAK3AUX's, and that is actually the safest configuration (cables
designed for VGA monitor use will not necessarily work).

The KAT500 should tune when the KPA500 is in operate mode, though - there is
a specific configuration for that in the KAT500 Utility. On the
Configuration tab, click Edit Configuration..., then in the Amplifier
Key Interrupt Power tab , click Optimize for Elecraft KPA500.

73,

~iain / N6ML



On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 Where do you see two DB15 cables in a diagram Brian?

 Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net 
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:57 PM
 To: Cady, Fred
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 F
 red, thanks.  I am using that cable both places where my diagram says 
 DB15 Cable.

 I guess I needed to have invested in only one.

 Everything seems to work, and the tuner protection works as well.  I 
 proved that by lowering K3 output power to 5 watts (just to be safe), 
 allowing the
 KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  
 That is the right result.

 73,

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and 
 the KPA500. It can be between the K3 and the KAT or the KAT and the 
 KPA.  You can use a full DE15HD cable other places but the KPAK3AUX 
 cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here 
 is my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
 (DB15) On
 KAT500
   |
   And  | 
ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when 
 the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the 
  DB15 cable and the PTT cable when used together.
 
  Are you using the PTT cable in addition to the cable from the K3 
  ACC cable?  If so, pin 10 of the cable should not be included.  See 
  the note on page 8 of the KAT500 manual.
 
  Normally you would not have to use the PTT cable with the K3.  See 
  pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10 
  of the ACC cable must be present.
 
  If you have other devices that need access ti the K3 Key Out line, 
  you would use the PTT cable AND use

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Ron D'Eau Claire]

That's correct Brian. But note that Figure 1 does *not* show a PTT cable.

 

The note associated with that figure for both of those cables says E850463
Aux interface cables with male and female connectors.You can order

E850463 from Elecraft or you can make your own (See E850463 Aux Cable
Wiring, above). 

 

Those are both straight through 15 pin cables as shown in Table 1 on page 4.
The wiring is given for those who wish to make or buy a straight through
DB15 cable instead of ordering the Elecraft cable. Either will work FB.. 

 

The issue is to NOT use a VGA cable, which is not wired straight through. 

 

If you want to use a separate PTT cable for any reason, Figure 2 shows how
to do that. That's usually because one needs to interrupt the PTT like such
as to inhibit a Stepper-IR controller which cannot tune with full QRO power
applied. 

 

Thanks,

 

Ron AC7AC 

 

From: Brian F. Wruble [mailto:bwru...@gmail.com] 
Sent: Thursday, August 01, 2013 7:01 PM
To: Ron D'Eau Claire
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 

Figure 1, Page 4, KAT500 manual




 

 

*Brian F. Wruble, C.F.A.

 

70 is the new 40.
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077  
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930  
eFax  305.768.0278  

 

 

 

On Thu, Aug 1, 2013 at 9:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:

Where do you see two DB15 cables in a diagram Brian?

Ron AC7AC


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble

Sent: Thursday, August 01, 2013 4:57 PM
To: Cady, Fred
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

F
red, thanks.  I am using that cable both places where my diagram says DB15
Cable.

I guess I needed to have invested in only one.

Everything seems to work, and the tuner protection works as well.  I proved
that by lowering K3 output power to 5 watts (just to be safe), allowing the
KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.  That
is the right result.

73,

Brian



*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and
 the KPA500. It can be between the K3 and the KAT or the KAT and the
 KPA.  You can use a full DE15HD cable other places but the KPAK3AUX
 cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here is
 my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
 (DB15) On
 KAT500
   |
   And  |  ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when
 the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the DB15
  cable and the PTT cable when used together.
 
  Are you using the PTT cable in addition to the cable from the K3 ACC
  cable?  If so, pin 10 of the cable should not be included.  See the
  note on page 8 of the KAT500 manual.
 
  Normally you would not have to use the PTT cable with the K3.  See
  pages 3 and 4 of the KAT500 manual.  For this arrangement, piin 10
  of the ACC cable must be present.
 
  If you have other devices that need access ti the K3 Key Out line,
  you would use the PTT cable AND use the key line interrupter to
  disconnect pin 10 from the DB15 Interface cable without the need for
  removing pin
 10. .
 
  73,
  Don W3FPR

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Ron D'Eau Claire]

Actually the KPA500 amplifier is designed to have its PTT line hot
switched at full power. See page Key Line Hot Switching on page 14 of the
manual. The 29 watt limit was set as default to keep people from blowing up
other less robust amplifiers by switching the PTT line at full power. 

When using the KPA500 with the KAT500, in the Utility Program click
Optimize for KPA500 to adjust the settings to take full advantage of the
capabilities of the K-line equipment (see Amplifier Key Interrupt Power on
page 29 of the KAT500 Owner's Manual). 

73 Ron AC7AC 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Cady, Fred
Sent: Thursday, August 01, 2013 7:29 PM
To: 'bwru...@gmail.com'
Cc: 'Elecraft Reflector'
Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

Pin 10, in the K3 ACC is the Key Out line that goes first to the KAT500 in
the KPAK3AUX cable and then on to the KPA in the second DB15 cable. When the
KAT institutes a tune cycle, it opens that line so it is interrupted from
going onto the KPA. Thus the amp won't be keyed and putting out power when
the KAT is tuning. The Amplifier key Interrupt power configuration in the
KAT is there because in some amplifiers (somebody may be using the KAT with
a brand X amp) you cannot interrupt the amp's keying line at more than a
certain power output without damaging the amp. So the KAT is delivered with
that interrupt power set at 29 watts (I think). If the power coming into the
KAT is more than that when the KAT wants to tune, it won't open the keying
line to save damaging the amp but that, of course, could damage the KAT. So,
because the KPA can be operating at full power out and won't suffer any
damage by opening its keying line, you should configure the KAT as Ian says
to optimize i  t for the KPA500.

Cheers,
Fred KE7X


Fred Cady
fcady at ieee dot org
 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:elecraft- 
 boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 8:13 PM
 To: iain macdonnell - N6ML
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Got it. Thanks.

 Figure 1 in the KAT500 manual leads one to believe that both cables 
 need to be KPAK3AUX, as both DB15 cables in the diagram are labeled 
 3, and one of the cables has the warning not to use a standard VGA 
 cable.  The note, 3
 also suggests 2 of that particular Elecraft cable.  An obvious 
 conclusion
 --- though wrong --- is that both need to be the same, and both could 
 be the special Elecraft (KPAK3AUX) cable or a modified VGA cable to be 
 the same as the KPAK3AUX..

 My understanding on the tuner issue was that the KAT500 could be 
 damaged by going through a retune cycle at high power.  Thus, some 
 kind of safety lockout is needed to prevent that.  If I can configure 
 the KAT500 to tune when the KPA500 is in operate mode, how do I 
 prevent that kind of damage from occurring?

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930
 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 10:00 PM, iain macdonnell - N6ML
 a...@dseven.orgwrote:

  Brian was referring to his cable lineup (quoted below).
 
  Brian, you do need two HD15 cables The point that Fred was 
  making is that one of them needs to be the Elecraft KPAK3AUX, whilst 
  the other one could be a straight-through cable with all 15 pins 
  connected. The KPAK3AUX does not connect all 15 pins, and that's 
  important. There is no harm in using two KPAK3AUX's, and that is 
  actually the safest configuration (cables designed for VGA monitor
 use
  will not necessarily work).
 
  The KAT500 should tune when the KPA500 is in operate mode, though - 
  there is a specific configuration for that in the KAT500 Utility. On 
  the Configuration tab, click Edit Configuration..., then in the 
  Amplifier Key Interrupt Power tab , click Optimize for Elecraft 
  KPA500.
 
  73,
 
  ~iain / N6ML
 
 
 
  On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz
 wrote:
   Where do you see two DB15 cables in a diagram Brian?
  
   Ron AC7AC
  
   -Original Message-
   From: elecraft-boun...@mailman.qth.net 
   [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F.
 Wruble
   Sent: Thursday, August 01, 2013 4:57 PM
   To: Cady, Fred
   Cc: Elecraft Reflector
   Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in
 Operate
  
   F
   red, thanks.  I am using that cable both places where my diagram
 says
  DB15
   Cable.
  
   I guess I needed to have invested in only one.
  
   Everything seems to work, and the tuner protection works as well.
 I
  proved
   that by lowering K3 output power to 5 watts (just to be safe),
 allowing
  the
   KPA500 to key and asking the KAT500 to re-tune

Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

[iain macdonnell - N6ML]

That's not what the KPA500 manual says :-

Elecraft K3 Cable Connections

This is available direct from Elecraft (pg 16): order KPAK3AUX . Pins
not shown have no connection.

The table shows only 10 pins.

Elsewhere in the KPA500 manual, it is stated that pin 7 must not be
connected to the K3.

I don't have a KPAK3AUX cable to test, as I made my own custom cables.

73,

~iain / N6ML



On Thu, Aug 1, 2013 at 7:51 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 The KPA3AUX cable DOES connect all 15 pins, Ian. It is simply a
 straight-through cable, unlike a common VGA cable.

 If you want to use a separate PTT line (e.g. to route through some other
 equipment that needs to control the amp, such as a Stepp-IR controller) you
 need to use the Key Line Interrupter shown in Figure 2 that opens the PTT
 line in the DB15 cable.

 73 Ron AC7AC


 -Original Message-
 From: dse...@dseven.org [mailto:dse...@dseven.org] On Behalf Of iain
 macdonnell - N6ML
 Sent: Thursday, August 01, 2013 7:01 PM
 To: Ron D'Eau Claire
 Cc: bwru...@gmail.com; Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Brian was referring to his cable lineup (quoted below).

 Brian, you do need two HD15 cables The point that Fred was making is
 that one of them needs to be the Elecraft KPAK3AUX, whilst the other one
 could be a straight-through cable with all 15 pins connected. The KPAK3AUX
 does not connect all 15 pins, and that's important. There is no harm in
 using two KPAK3AUX's, and that is actually the safest configuration (cables
 designed for VGA monitor use will not necessarily work).

 The KAT500 should tune when the KPA500 is in operate mode, though - there is
 a specific configuration for that in the KAT500 Utility. On the
 Configuration tab, click Edit Configuration..., then in the Amplifier
 Key Interrupt Power tab , click Optimize for Elecraft KPA500.

 73,

 ~iain / N6ML



 On Thu, Aug 1, 2013 at 6:48 PM, Ron D'Eau Claire r...@cobi.biz wrote:
 Where do you see two DB15 cables in a diagram Brian?

 Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:57 PM
 To: Cady, Fred
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 F
 red, thanks.  I am using that cable both places where my diagram says
 DB15 Cable.

 I guess I needed to have invested in only one.

 Everything seems to work, and the tuner protection works as well.  I
 proved that by lowering K3 output power to 5 watts (just to be safe),
 allowing the
 KPA500 to key and asking the KAT500 to re-tune.  it refuses to do so.
 That is the right result.

 73,

 Brian



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 7:08 PM, Cady, Fred fc...@ece.montana.edu wrote:

 Hi Brian,
 Make sure you are using a KPAK3AUX cable somewhere between the K3 and
 the KPA500. It can be between the K3 and the KAT or the KAT and the
 KPA.  You can use a full DE15HD cable other places but the KPAK3AUX
 cable needs to be in there somewhere.
 Cheers,
 Fred KE7X
 The Elecraft K3: Design, Configuration and Operation
 The Elecraft KX3 - Going for the Summit
 (soon - The Elecraft K-Line - KPA500 and KAT500)


 -Original Message-
 From: elecraft-boun...@mailman.qth.net [mailto:
 elecraft-boun...@mailman.qth.net] On Behalf Of Brian F. Wruble
 Sent: Thursday, August 01, 2013 4:17 PM
 To: d...@w3fpr.com
 Cc: Elecraft Reflector
 Subject: Re: [Elecraft] K3 Receive Attenuation with KPA500 in Operate

 Hi Don,

 Thanks for the prompt response.

 Yes, I am using the DB15 and the PTT line.  I got it working.  Here
 is my new cable lineup:




 1.  ACC on K3 (DB15)  DB15 Y Cable | DB15 Cable  XCVR
 (DB15) On
 KAT500
   |
   And  | 
 ACC
 on Navigator Interface


 2.  RS232 on K3  XCVR (RS232) on P3


 3.  PC on P3  RS232 on Navigator Interface


 4.  AMP on KAT500 (DB15)  DB15 Cable  AUX1 (DB15) on KPA500

 5.  NO PTT LINE into KPA500 or into KAT500

 6. No Key Line Interupter anyplace.


 With this lineup, is the KAT500 protected from the KPA500 keying when
 the
 KAT500 is tuning?

 I must admit, I have mightily confused myself in this process.

 Thanks again,

 Brian W3BW



 *Brian F. Wruble, C.F.A.

 *70 is the new 40.*
 *
 Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
 Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD
 21930 eFax  305.768.0278







 On Thu, Aug 1, 2013 at 5:01 PM, Don Wilhelm w3...@embarqmail.com wrote:

  Brian,
 
  I have heard this before, and as I recall it has to do with the
  DB15 cable and the PTT cable when used together