k3 tuning power question

[KD8NNU]

I have a K3 100 watt version and I am curious about what a proper tuning
outpower should be to minimize the potential to damage anything.

I have been using 10 watts but I think that I am then at full power for
low power operation amp so I am thinking I need to have the high power
section transmitting at a low power.  So I am thinking that you need to
be above 12.

Bottomline is I am not sure how this part of the radio really works and
sometimes if I start tuning and have a bad match it takes me some time
with the manual tuner to get the swr good.

So any pointers on the best way to set the radio up would be greatly
appreciated

Thanks
Don
KD8NNU


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[Matt Zilmer]

I had TUN PWR set to 10 W for a while with no damage to anything.
Since early 2008, it's been set to 25W.

Don't worry, the K3 is pretty much indestructible.

matt W6NIA


On Thu, 20 Jan 2011 18:08:39 -0500 (EST), you wrote:

>I have a K3 100 watt version and I am curious about what a proper tuning
>outpower should be to minimize the potential to damage anything.
>
>I have been using 10 watts but I think that I am then at full power for
>low power operation amp so I am thinking I need to have the high power
>section transmitting at a low power.  So I am thinking that you need to
>be above 12.
>
>Bottomline is I am not sure how this part of the radio really works and
>sometimes if I start tuning and have a bad match it takes me some time
>with the manual tuner to get the swr good.
>
>So any pointers on the best way to set the radio up would be greatly
>appreciated
>
>Thanks
>Don
>KD8NNU
>
>
>______________________________________________________________
>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

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[Jeff Cochrane - VK4XA]

CONTENTS DELETED

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[Phil Salas]

I set my tune power to 15 watts, as this runs the 100 watt PA close to
minimum output during tuning.  And 15 watts also gives me very good tuning
accuracy with my MFJ-998 external auto-tuner.

Phil - AD5X

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[W4GRJ]

This is more a educational question. When using the manual notch to take out
a constant carrier, I can see the notch take out the carrier on the DSM780
waterfall however, the carrier is still visible on the P3 waterfall. Just
wondering why you can't see the same notch effect in the P3 waterfall.
Thanks,
Jack
W4GRJ


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[Chuck Shefflette]

This is because the P3 waterfall is taken from the IF output. The notch is done with the DSP on the 15KHz IF, not the 8215KHz IF.

Chuck - AA3CS
On 21 Jan 2011, at 08:15, W4GRJ wrote:

> This is more a educational question. When using the manual notch to take out
> a constant carrier, I can see the notch take out the carrier on the DSM780
> waterfall however, the carrier is still visible on the P3 waterfall. Just
> wondering why you can't see the same notch effect in the P3 waterfall.
> Thanks,
> Jack
> W4GRJ
>
>
> ______________________________________________________________
> Elecraft mailing list
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[Johnny Siu]

The manual notch is NOT within AGC loop.

 cheers,


Johnny VR2XMC




________________________________
寄件人﹕ Chuck Shefflette <[hidden email]>
收件人﹕ W4GRJ <[hidden email]>
副本(CC) [hidden email]
傳送日期﹕ 2011/1/21 (五) 9:33:54 PM
主題： Re: [Elecraft] P3 Waterfall

This is because the P3 waterfall is taken from the IF output. The notch is done
with the DSP on the 15KHz IF, not the 8215KHz IF.

Chuck - AA3CS
On 21 Jan 2011, at 08:15, W4GRJ wrote:

> This is more a educational question. When using the manual notch to take out
> a constant carrier, I can see the notch take out the carrier on the DSM780
> waterfall however, the carrier is still visible on the P3 waterfall. Just
> wondering why you can't see the same notch effect in the P3 waterfall.
> Thanks,
> Jack
> W4GRJ



     
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[Joe Subich, W4TV-4]

 > The manual notch is NOT within AGC loop.

It's not a matter or the notch being within the AGC loop (although
it should be for other reasons).  The P3 is fed from the output of
the first mixer - before the "roofing filter."  That's the only
place to get a 200 KHz +/- bandwidth.

73,

    ... Joe, W4TV


On 1/21/2011 9:26 AM, Johnny Siu wrote:

> The manual notch is NOT within AGC loop.
>
>   cheers,
>
>
> Johnny VR2XMC
>
>
>
>
> ________________________________
> 寄件人﹕ Chuck Shefflette<[hidden email]>
> 收件人﹕ W4GRJ<[hidden email]>
> 副本(CC) [hidden email]
> 傳送日期﹕ 2011/1/21 (五) 9:33:54 PM
> 主題： Re: [Elecraft] P3 Waterfall
>
> This is because the P3 waterfall is taken from the IF output. The notch is done
> with the DSP on the 15KHz IF, not the 8215KHz IF.
>
> Chuck - AA3CS
> On 21 Jan 2011, at 08:15, W4GRJ wrote:
>
>> This is more a educational question. When using the manual notch to take out
>> a constant carrier, I can see the notch take out the carrier on the DSM780
>> waterfall however, the carrier is still visible on the P3 waterfall. Just
>> wondering why you can't see the same notch effect in the P3 waterfall.
>> Thanks,
>> Jack
>> W4GRJ
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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