KPA500 Bypass Power Limit?

[Elecraft mailing list]

How much power can I run through a KPA500 that is in BYPASS, or turned off?  That is, using exciter power only?
Thanks!

73, Eric WD6DBM


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[Michael Walker]

Hi Eric

A 100 watts works without issue.

What sort of power did you have in mind?

Mike


On Fri, Dec 25, 2020 at 8:01 PM eric norris via Elecraft <
[hidden email]> wrote:

> How much power can I run through a KPA500 that is in BYPASS, or turned
> off?  That is, using exciter power only?
> Thanks!
>
> 73, Eric WD6DBM
>
> 
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[Eric Norris-2]

200-250w if it's safe.

73 Eric WD6DBM

On Fri, Dec 25, 2020, 6:28 PM Michael Walker <[hidden email]> wrote:

> Hi Eric
>
> A 100 watts works without issue.
>
> What sort of power did you have in mind?
>
> Mike
>
>
> On Fri, Dec 25, 2020 at 8:01 PM eric norris via Elecraft <
> [hidden email]> wrote:
>
> > How much power can I run through a KPA500 that is in BYPASS, or turned
> > off?  That is, using exciter power only?
> > Thanks!
> >
> > 73, Eric WD6DBM
> >
> > 
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
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[Elecraft mailing list]

 as per the manual

"You may run up to 100 watts through the KPA500 in STBY."




    On Friday, December 25, 2020, 08:01:49 PM EST, eric norris via Elecraft <[hidden email]> wrote:  
 
 How much power can I run through a KPA500 that is in BYPASS, or turned off?  That is, using exciter power only?
Thanks!

73, Eric WD6DBM


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[ANDY DURBIN]

"How much power can I run through a KPA500 that is in BYPASS"

KPA500 has no "BYPASS" mode.  It is either Off, On in STBY, or On in OPER.

The  KPA500 Owner's Manual says - "Transmitting - The POWER (W) and standing wave ratio (SWR) bargraphs are functional when the amplifier is in standby (STBY). Twenty-five watts from the driving transceiver will illuminate the first POWER LED. You may run up to 200 watts through the KPA500 in STBY."

The answer to your question would appear to be "200 W".

73,
Andy k3wyc

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[Adrian-3]

There was no question regarding if the amp had a bypass 'mode' It was as
you quoted;

"How much power can I run through a KPA500 that is in BYPASS"

So in 'standby' mode the amp is 'in bypass' as its input is connected to its output.

So it seems an unnecessary invalid initial answer to a question that did not exist regarding bypass mode.

However ;

"You may run up to 200 watts through the KPA500 in STBY." was on the money.


On 26/12/20 1:12 pm, Andy Durbin wrote:

> "How much power can I run through a KPA500 that is in BYPASS"
>
> KPA500 has no "BYPASS" mode.  It is either Off, On in STBY, or On in OPER.
>
> The  KPA500 Owner's Manual says - "Transmitting - The POWER (W) and standing wave ratio (SWR) bargraphs are functional when the amplifier is in standby (STBY). Twenty-five watts from the driving transceiver will illuminate the first POWER LED. You may run up to 200 watts through the KPA500 in STBY."
>
> The answer to your question would appear to be "200 W".
>
> 73,
> Andy k3wyc
>
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[Jim Brown-10]

On 12/25/2020 7:12 PM, Andy Durbin wrote:
> KPA500 has no "BYPASS" mode.  It is either Off, On in STBY, or On in OPER.

Picky, picky, picky. :) When all of the power amps I'm aware of are in a
mode usually called "Standby," meaning that they are powered up and
ready to transmit, but are Bypassed. they are Bypassed. They are also
Bypassed when turned off. And when tube amps are prevented from
transmitting when their filaments are warming up, they are Bypassed.

73, Jim K9YC






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[Lyn WØLEN]

My KPA500 goes into PASS-THROUGH mode when the Power is set to Off, or the power is On but the unit is in Standby.  It does not process the signal in any way, merely acknowledges its presence.  It does not have a Bypass mode.  In order to Bypass it, I need to move a couple of cables.

My KAT500, however, does have a BYPASS mode in which it measures the SWR and makes a decision on whether or not to provide any additional processing, other than routing it to the preferred ANTENNA, based on my indicated preferences.

73.0
Lyn, W0LEN

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jim Brown
Sent: Saturday, December 26, 2020 1:55 AM
To: [hidden email]
Subject: Re: [Elecraft] KPA500 Bypass Power Limit?

On 12/25/2020 7:12 PM, Andy Durbin wrote:
> KPA500 has no "BYPASS" mode.  It is either Off, On in STBY, or On in OPER.

Picky, picky, picky. :) When all of the power amps I'm aware of are in a
mode usually called "Standby," meaning that they are powered up and
ready to transmit, but are Bypassed. they are Bypassed. They are also
Bypassed when turned off. And when tube amps are prevented from
transmitting when their filaments are warming up, they are Bypassed.

73, Jim K9YC






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