Elecraft

KPA1500 Enhancement

Classic

List

Threaded

11 messages Options

Thomas Donohue

KPA1500 Enhancement

Hi to all:

Wayne or Eric. Are there any plans or thoughts about adding a second RF input to the amp, similar to what the Yaesu VL-1000 has?

Best 73,
Tom/W1QU

Sent from my iPad
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Gary K9GS

Re: KPA1500 Enhancement

This would be a great feature

73,
Gary K9GS
-------- Original message --------From: Thomas Donohue <[hidden email]> Date: 4/26/17 8:07 AM (GMT-06:00) To: [hidden email] Subject: [Elecraft] KPA1500 Enhancement
Hi to all:

Wayne or Eric. Are there any plans or thoughts about adding a second RF input to the amp, similar to what the Yaesu VL-1000 has?

Best 73,
Tom/W1QU

Sent from my iPad
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Matthew Cook

Re: KPA1500 Enhancement

In reply to this post by Thomas Donohue

If that were to happen then adding a second 15-way connector at the same
time to said module to allow two K3/K3s to drive the one amp through each
respective antenna input and matched output would start this amp towards
the "basic" SO2R path. From there a smart 2x6 antenna switching unit some
well designed BPF filters and your well on your way. The rest of the magic
is then just firmware (says he that writes said firmware every day) within
the upgraded processor the KPA1500 has been blessed with.

I'm fingers crossed..

73

Matthew
VK5ZM

On 26 April 2017 at 22:37, Thomas Donohue <[hidden email]> wrote:

> Hi to all:
>
> Wayne or Eric. Are there any plans or thoughts about adding a second RF
> input to the amp, similar to what the Yaesu VL-1000 has?
>
> Best 73,
> Tom/W1QU
>
>
> Sent from my iPad
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Elecraft mailing list

Re: KPA1500 Enhancement

In reply to this post by Thomas Donohue

I had bad the suggestion for a switch box that would allow using the kpa1500 or the kpa500 with multiple radios a few days ago.
Hopefuly they are looking into pooducing one.
I have one I built but would prefer one the had the aux data switching in it.

-------- Original message --------
From: Matthew Cook <[hidden email]>
Date: 2017-04-26 8:44 PM (GMT-05:00)
To: Thomas Donohue <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>
Subject: Re: [Elecraft] KPA1500 Enhancement

If that were to happen then adding a second 15-way connector at the same
time to said module to allow two K3/K3s to drive the one amp through each
respective antenna input and matched output would start this amp towards
the "basic" SO2R path. From there a smart 2x6 antenna switching unit some
well designed BPF filters and your well on your way. The rest of the magic
is then just firmware (says he that writes said firmware every day) within
the upgraded processor the KPA1500 has been blessed with.

I'm fingers crossed..

73

Matthew
VK5ZM

On 26 April 2017 at 22:37, Thomas Donohue <[hidden email]> wrote:

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

K7TV

Re: KPA1500 Enhancement

In reply to this post by Thomas Donohue

Of course, in an SO2R scenario where the shared amplifier alternates between
two different bands with every transmission, a shared ATU would exercise the
relays a lot. Separate tuners might be needed in order to avoid the relays
wearing out.

73,
Erik K7TV

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of
Matthew Cook
Sent: Wednesday, April 26, 2017 5:45 PM
To: Thomas Donohue <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>
Subject: Re: [Elecraft] KPA1500 Enhancement

If that were to happen then adding a second 15-way connector at the same
time to said module to allow two K3/K3s to drive the one amp through each
respective antenna input and matched output would start this amp towards the
"basic" SO2R path. From there a smart 2x6 antenna switching unit some well
designed BPF filters and your well on your way. The rest of the magic is
then just firmware (says he that writes said firmware every day) within the
upgraded processor the KPA1500 has been blessed with.

I'm fingers crossed..

73

Matthew
VK5ZM

On 26 April 2017 at 22:37, Thomas Donohue <[hidden email]> wrote:

> Hi to all:
>
> Wayne or Eric. Are there any plans or thoughts about adding a second
> RF input to the amp, similar to what the Yaesu VL-1000 has?
>
> Best 73,
> Tom/W1QU
>
>
> Sent from my iPad
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message
delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Matthew Cook

Re: KPA1500 Enhancement

Now there's a good point, have to make sure the antennas are well matched
and put the tuner into bypass.

So time to get back to working on the 1500W W3NQN filter designs... and the
high power paperwork requirements from our regulatory body to run that sort
of power level... sigh.

73

Matthew
VK5ZM

On 27 April 2017 at 12:29, Erik Basilier <[hidden email]> wrote:

> Of course, in an SO2R scenario where the shared amplifier alternates
> between
> two different bands with every transmission, a shared ATU would exercise
> the
> relays a lot. Separate tuners might be needed in order to avoid the relays
> wearing out.
>
> 73,
> Erik K7TV
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of
> Matthew Cook
> Sent: Wednesday, April 26, 2017 5:45 PM
> To: Thomas Donohue <[hidden email]>
> Cc: Elecraft Reflector <[hidden email]>
> Subject: Re: [Elecraft] KPA1500 Enhancement
>
> If that were to happen then adding a second 15-way connector at the same
> time to said module to allow two K3/K3s to drive the one amp through each
> respective antenna input and matched output would start this amp towards
> the
> "basic" SO2R path. From there a smart 2x6 antenna switching unit some well
> designed BPF filters and your well on your way. The rest of the magic is
> then just firmware (says he that writes said firmware every day) within the
> upgraded processor the KPA1500 has been blessed with.
>
> I'm fingers crossed..
>
> 73
>
> Matthew
> VK5ZM
>
> On 26 April 2017 at 22:37, Thomas Donohue <[hidden email]> wrote:
>
> > Hi to all:
> >
> > Wayne or Eric. Are there any plans or thoughts about adding a second
> > RF input to the amp, similar to what the Yaesu VL-1000 has?
> >
> > Best 73,
> > Tom/W1QU
> >
> >
> > Sent from my iPad
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net Please help support this email
> > list: http://www.qsl.net/donate.html Message delivered to
> > [hidden email]
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message
> delivered to [hidden email]
>
>

Jim Brown-10

Re: KPA1500 Enhancement

Stubs, optimally applied, are an excellent and low cost substitute for
high power bandpass filters. A properly placed 2-stub filter using a
decent RG8/213 typically provides 60 dB of attenuation at the second
harmonic, that in addition to the suppression provided by the
amplifier's output network.

I've settled for 5B4AGN's W3NQN implementation of filter sets
conservatively rated for 200W between exciter and power amp. That takes
care of protecting the receiver and also killing any phase noise the
other radio is producing.

In my experience with SO2R and other multi-transmitter setups and all
K3s, killing the amplifier's second harmonic mostly matters between 80
and 40 CW, and 40 and 20 CW, because the harmonic lands in the same
part of the higher band where we want to operate.

73, Jim K9YC

On Wed,4/26/2017 10:50 PM, Matthew Cook wrote:
> So time to get back to working on the 1500W W3NQN filter designs... and the
> high power paperwork requirements from our regulatory body to run that sort
> of power level... sigh.

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

briancom

Re: KPA1500 Enhancement

In reply to this post by K7TV

Question:
Can the internal tuner be completely bypassed like the K3S can do with
its tuner?
Brian/K3KO

On 4/27/2017 2:59 AM, Erik Basilier wrote:

> Of course, in an SO2R scenario where the shared amplifier alternates between
> two different bands with every transmission, a shared ATU would exercise the
> relays a lot. Separate tuners might be needed in order to avoid the relays
> wearing out.
>
> 73,
> Erik K7TV
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of
> Matthew Cook
> Sent: Wednesday, April 26, 2017 5:45 PM
> To: Thomas Donohue <[hidden email]>
> Cc: Elecraft Reflector <[hidden email]>
> Subject: Re: [Elecraft] KPA1500 Enhancement
>
> If that were to happen then adding a second 15-way connector at the same
> time to said module to allow two K3/K3s to drive the one amp through each
> respective antenna input and matched output would start this amp towards the
> "basic" SO2R path. From there a smart 2x6 antenna switching unit some well
> designed BPF filters and your well on your way. The rest of the magic is
> then just firmware (says he that writes said firmware every day) within the
> upgraded processor the KPA1500 has been blessed with.
>
> I'm fingers crossed..
>
> 73
>
> Matthew
> VK5ZM
>
> On 26 April 2017 at 22:37, Thomas Donohue <[hidden email]> wrote:
>
>> Hi to all:
>>
>> Wayne or Eric. Are there any plans or thoughts about adding a second
>> RF input to the amp, similar to what the Yaesu VL-1000 has?
>>
>> Best 73,
>> Tom/W1QU
>>
>>
>> Sent from my iPad
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this email
>> list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Roy Koeppe

Re: KPA1500 Enhancement

Re:

Question:

"Can the internal tuner be completely bypassed like the K3S can do with
its tuner?"

I see a bypass button on front panel.

73, Roy K6XK

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Igor Sokolov-2

Re: KPA1500 Enhancement

In reply to this post by K7TV

May I mention that for SO2R in the same box the isolation should be in
order of 80db for 1500 w power level.

This is not that easy to obtain.

73, Igor UA9CDC

27.04.2017 7:59, Erik Basilier пишет:

K7TV

Re: KPA1500 Enhancement

In reply to this post by K7TV

Doing the switching outside the amplifier box may be an easier and more economical way to achieve that isolation. There may be further economy as well as simplification to be had if this switching hardware is combined as a single product with the antenna selection switch (2 antennas out of 6 etc). While some may be happy running without tuner, many would want duplicated tuners external to the shared amplifier. Incorporating separate tuners would not impose additional RF switching requirements, but possibly some additional considerations relating to the control scheme. Of course, the user would want to be able to purchase the amp without built-in tuner.

73.
Erik K7TV

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Igor Sokolov
Sent: Thursday, April 27, 2017 5:00 AM
To: [hidden email]
Subject: Re: [Elecraft] KPA1500 Enhancement

May I mention that for SO2R in the same box the isolation should be in order of 80db for 1500 w power level.

This is not that easy to obtain.

73, Igor UA9CDC

27.04.2017 7:59, Erik Basilier пишет:

> Of course, in an SO2R scenario where the shared amplifier alternates
> between two different bands with every transmission, a shared ATU
> would exercise the relays a lot. Separate tuners might be needed in
> order to avoid the relays wearing out.
>
> 73,
> Erik K7TV
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of
> Matthew Cook
> Sent: Wednesday, April 26, 2017 5:45 PM
> To: Thomas Donohue <[hidden email]>
> Cc: Elecraft Reflector <[hidden email]>
> Subject: Re: [Elecraft] KPA1500 Enhancement
>
> If that were to happen then adding a second 15-way connector at the
> same time to said module to allow two K3/K3s to drive the one amp
> through each respective antenna input and matched output would start
> this amp towards the "basic" SO2R path. From there a smart 2x6
> antenna switching unit some well designed BPF filters and your well on
> your way. The rest of the magic is then just firmware (says he that
> writes said firmware every day) within the upgraded processor the KPA1500 has been blessed with.
>
> I'm fingers crossed..
>
> 73
>
> Matthew
> VK5ZM
>
> On 26 April 2017 at 22:37, Thomas Donohue <[hidden email]> wrote:
>
>> Hi to all:
>>
>> Wayne or Eric. Are there any plans or thoughts about adding a second
>> RF input to the amp, similar to what the Yaesu VL-1000 has?
>>
>> Best 73,
>> Tom/W1QU
>>
>>
>> Sent from my iPad
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email
>> list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]