[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 <fcady at 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-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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