[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-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Brian F. Wruble
Sent: Thursday, August 01, 2013 4:17 PM
To: don at 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 <w3fpr at 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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