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K3 on AM with AL811H amplifier

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AMFMTV

K3 on AM with AL811H amplifier

Just thought you'd all like to know that I have been getting GREAT AUDIO
reports from running K3 #1717 on AM, into an AL811H amplifier driving the amp
to about 125 watts carrier. Connecting the K3 to the amp was as simple as
plugging in the relay cable and the coax.

Running AM and using the sync detection on AM surpasses even my old boat
anchor AM receivers. For me, the K3 is the true all purpose radio.

73
Ted W8IXY
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AD4C2009

Re: K3 on AM with AL811H amplifier

Good morning Ted,let me tell you something,since the very first day I got my K3 serial 2192 I have been using it on AM on 40M with guys who work on 7180,I use it with my AL-80B,when I key up the K3 puts out 40W and that makes 400W out of the amp and when I talk it swings up to 1KW,the TX modulation percentage its about 90 to 95% and the reports from the old timers using vintage radios is great always,some guys says look that I am using a big boat anchor AM station,in fact there was a guy who loved it so much that he was asking which company made the K3 because he wanted to have one.
Without a doubt a K3 is an all mode perfect radio to own,73

AD4C

"For a refined ham it is compulsory to own a k3"

--- On Sun, 2/21/10, [hidden email] <[hidden email]> wrote:

From: [hidden email] <[hidden email]>
Subject: [Elecraft] K3 on AM with AL811H amplifier
To: [hidden email]
Date: Sunday, February 21, 2010, 3:27 AM

Just thought you'd all like to know that I have been getting GREAT AUDIO
reports from running K3 #1717 on AM, into an AL811H amplifier driving the amp
to about 125 watts carrier. Connecting the K3 to the amp was as simple as
plugging in the relay cable and the coax.

Running AM and using the sync detection on AM surpasses even my old boat
anchor AM receivers. For me, the K3 is the true all purpose radio.

73
Ted W8IXY
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Jan Erik Holm

Re: K3 on AM with AL811H amplifier

That will come out to 160W PEP on the K3 and 1600W PEP
on the amp. I would not set the K3 to more then 25W
(i e 100W PEP). Don´t know how much the AL80B can handle
but 1600W PEP sounds to be too much.

/ Jim
----------------------
Hector Padron wrote:

> Good morning Ted,let me tell you something,since the very first day I got my K3 serial 2192 I have been using it on AM on 40M with guys who work on 7180,I use it with my AL-80B,when I key up the K3 puts out 40W and that makes 400W out of the amp and when I talk it swings up to 1KW,the TX modulation percentage its about 90 to 95% and the reports from the old timers using vintage radios is great always,some guys says look that I am using a big boat anchor AM station,in fact there was a guy who loved it so much that he was asking which company made the K3 because he wanted to have one.
> Without a doubt a K3 is an all mode perfect radio to own,73
>
> AD4C
>
>
>
> "For a refined ham it is compulsory to own a k3"
>
> --- On Sun, 2/21/10, [hidden email] <[hidden email]> wrote:
>
>
> From: [hidden email] <[hidden email]>
> Subject: [Elecraft] K3 on AM with AL811H amplifier
> To: [hidden email]
> Date: Sunday, February 21, 2010, 3:27 AM
>
>
> Just thought you'd all like to know that I have been getting GREAT AUDIO
> reports from running K3 #1717 on AM, into an AL811H amplifier driving the amp
> to about 125 watts carrier. Connecting the K3 to the amp was as simple as
> plugging in the relay cable and the coax.
>
> Running AM and using the sync detection on AM surpasses even my old boat
> anchor AM receivers. For me, the K3 is the true all purpose radio.
>
> 73
> Ted W8IXY

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Joe Subich, W4TV-4

Re: K3 on AM with AL811H amplifier

> Don´t know how much the AL80B can handle
> but 1600W PEP sounds to be too much.

The AL-80B is a single 3-500Z. It is capable of 800W peak if
it is to remain clean and should not be run at more than 500 W
CW. 40W carrier from the K3 and 400W carrier from the AL-80B
are, in both cases, grossly out of spec.

The K3 should not be run at more than 25W of carrier (28W absolute
max) and the AL-80B (or any single 3-500Z) should not be pushed to
more than 200W carrier (absolute maximum).

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Jan Erik Holm
> Sent: Sunday, February 21, 2010 6:29 AM
> To: Hector Padron
> Cc: [hidden email]; [hidden email]
> Subject: Re: [Elecraft] K3 on AM with AL811H amplifier
>
>
> That will come out to 160W PEP on the K3 and 1600W PEP
> on the amp. I would not set the K3 to more then 25W
> (i e 100W PEP). Don´t know how much the AL80B can handle
> but 1600W PEP sounds to be too much.
>
> / Jim
> ----------------------
> Hector Padron wrote:
> > Good morning Ted,let me tell you something,since the very
> first day I
> > got my K3 serial 2192 I have been using it on AM on 40M
> with guys who
> > work on 7180,I use it with my AL-80B,when I key up the K3
> puts out 40W and that makes 400W out of the amp and when I
> talk it swings up to 1KW,the TX modulation percentage its
> about 90 to 95% and the reports from the old timers using
> vintage radios is great always,some guys says look that I am
> using a big boat anchor AM station,in fact there was a guy
> who loved it so much that he was asking which company made
> the K3 because he wanted to have one. Without a doubt a K3 is
> an all mode perfect radio to own,73
> >
> > AD4C
> >
> >
> >
> > "For a refined ham it is compulsory to own a k3"
> >
> > --- On Sun, 2/21/10, [hidden email] <[hidden email]> wrote:
> >
> >
> > From: [hidden email] <[hidden email]>
> > Subject: [Elecraft] K3 on AM with AL811H amplifier
> > To: [hidden email]
> > Date: Sunday, February 21, 2010, 3:27 AM
> >
> >
> > Just thought you'd all like to know that I have been getting GREAT
> > AUDIO
> > reports from running K3 #1717 on AM, into an AL811H
> amplifier driving the amp
> > to about 125 watts carrier. Connecting the K3 to the amp
> was as simple as
> > plugging in the relay cable and the coax.
> >
> > Running AM and using the sync detection on AM surpasses even my old
> > boat
> > anchor AM receivers. For me, the K3 is the true all purpose radio.
> >
> > 73
> > Ted W8IXY
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html

Chuck - AE4CW

Re: K3 on AM with AL811H amplifier

Joe,

You are quite correct about limiting AM carrier power on the K3 to 25 watts and AL-80B carrier power to 200 watts. However, according to Ameritron and Tom, W8JI (designer of the AL-80B), 1000 watts PEP on SSB is the upper limit as is 800 watts on CW. The key to minimizing non-linearity is to tune with drive set to produce the maximum PEP that will be produced by the transmitted envelope and then slightly "over-tune" (less capacitance) the load control.

Chuck, AE4CW

<quote author="Joe Subich, W4TV-4">

> Don´t know how much the AL80B can handle
> but 1600W PEP sounds to be too much.

The AL-80B is a single 3-500Z. It is capable of 800W peak if
it is to remain clean and should not be run at more than 500 W
CW. 40W carrier from the K3 and 400W carrier from the AL-80B
are, in both cases, grossly out of spec.

The K3 should not be run at more than 25W of carrier (28W absolute
max) and the AL-80B (or any single 3-500Z) should not be pushed to
more than 200W carrier (absolute maximum).

73,

... Joe, W4TV

---
Chuck, AE4CW

Vic K2VCO

Re: K3 on AM with AL811H amplifier

In reply to this post by Joe Subich, W4TV-4

On 2/21/10 6:23 AM, Joe Subich, W4TV wrote:
>
> The AL-80B is a single 3-500Z. It is capable of 800W peak if
> it is to remain clean and should not be run at more than 500 W
> CW.

I'm surprised to hear this. Most people think a single 3-500Z can
produce 750w ICAS without problems.
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Joe Subich, W4TV-4

Re: K3 on AM with AL811H amplifier

In reply to this post by Chuck - AE4CW

> However, according to Ameritron and Tom, W8JI (designer of
> the AL-80B), 1000 watts PEP on SSB is the upper limit as is
> 800 watts on CW.

I don't normally disagree with Tom, W8JI. However, Eimac's
data sheets on the 3-500Z - both the 1968 version and the
current (1980) version - rate the PEP Output Power of a single
tube in AB2 at 750 Watts. The 1980 version includes a set of
at 3500V on the plate that pushes the output to 900 Watts
PEP - NOT 1KW.

> The key to minimizing non-linearity is to
> tune with drive set to produce the maximum PEP that will be
> produced by the transmitted envelope and then slightly
> "over-tune" (less capacitance) the load control.

And that's not something that one can do when trying to drive
the AL-80B/K3 combination to 400 W carrier/1600W PEP output.

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Chuck - AE4CW
> Sent: Sunday, February 21, 2010 5:30 PM
> To: [hidden email]
> Subject: Re: [Elecraft] K3 on AM with AL811H amplifier
>
>
>
> Joe,
>
> You are quite correct about limiting AM carrier power on the
> K3 to 25 watts and AL-80B carrier power to 200 watts.
> However, according to Ameritron and Tom, W8JI (designer of
> the AL-80B), 1000 watts PEP on SSB is the upper limit as is
> 800 watts on CW. The key to minimizing non-linearity is to
> tune with drive set to produce the maximum PEP that will be
> produced by the transmitted envelope and then slightly
> "over-tune" (less capacitance) the load control.
>
> Chuck, AE4CW
>
>
>
> > Don´t know how much the AL80B can handle
> > but 1600W PEP sounds to be too much.
>
> The AL-80B is a single 3-500Z. It is capable of 800W peak if
> it is to remain clean and should not be run at more than 500 W
> CW. 40W carrier from the K3 and 400W carrier from the AL-80B
> are, in both cases, grossly out of spec.
>
> The K3 should not be run at more than 25W of carrier (28W absolute
> max) and the AL-80B (or any single 3-500Z) should not be pushed to
> more than 200W carrier (absolute maximum).
>
> 73,
>
> ... Joe, W4TV
>
>
> --
> View this message in context:
> http://n2.nabble.com/K3-on-AM-with-AL811H-amplifier-tp4605487p

4609071.html
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Joe Subich, W4TV-4

Re: K3 on AM with AL811H amplifier

In reply to this post by Vic K2VCO

While it may be able to produce 750W ICAS, Eimac rate it at
600W PEP for minimum distortion products. I would not think
it wise to push it harder than that in AM.

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Vic, K2VCO
> Sent: Sunday, February 21, 2010 11:06 PM
> To: [hidden email]
> Subject: Re: [Elecraft] K3 on AM with AL811H amplifier
>
>
> On 2/21/10 6:23 AM, Joe Subich, W4TV wrote:
> >
> > The AL-80B is a single 3-500Z. It is capable of 800W peak
> if it is to
> > remain clean and should not be run at more than 500 W CW.
>
> I'm surprised to hear this. Most people think a single 3-500Z can
> produce 750w ICAS without problems.
> --
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Vic K2VCO

Re: K3 on AM with AL811H amplifier

I'm referring to your comment about 500W CW.

On 2/21/10 9:32 PM, Joe Subich, W4TV wrote:

>
> While it may be able to produce 750W ICAS, Eimac rate it at
> 600W PEP for minimum distortion products. I would not think
> it wise to push it harder than that in AM.
>
> 73,
>
> ... Joe, W4TV
>
>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of Vic, K2VCO
>> Sent: Sunday, February 21, 2010 11:06 PM
>> To: [hidden email]
>> Subject: Re: [Elecraft] K3 on AM with AL811H amplifier
>>
>>
>> On 2/21/10 6:23 AM, Joe Subich, W4TV wrote:
>>>
>>> The AL-80B is a single 3-500Z. It is capable of 800W peak
>> if it is to
>>> remain clean and should not be run at more than 500 W CW.
>>
>> I'm surprised to hear this. Most people think a single 3-500Z can
>> produce 750w ICAS without problems.

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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