[Elecraft] K3 Receive Attenuation with KPA500 in Operate
Ron D'Eau Claire
ron at cobi.biz
Thu Aug 1 22:51:31 EDT 2013
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: dseven at dseven.org [mailto:dseven at dseven.org] On Behalf Of iain
macdonnell - N6ML
Sent: Thursday, August 01, 2013 7:01 PM
To: Ron D'Eau Claire
Cc: bwruble at 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 <ron at cobi.biz> wrote:
> Where do you see two DB15 cables in a diagram Brian?
>
> Ron AC7AC
>
> -----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 4:57 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 <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.
>> >>
>> >>
>> >>
>> >
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email
>> list: http://www.qsl.net/donate.html
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html
More information about the Elecraft
mailing list