KX3 2m external amplifier

[Jim Brown-10]

On Fri,7/29/2016 10:31 AM, Ron D'Eau Claire wrote:
> Are those capable of linear operation for SSB as the poster asked? The ones
> I had back then were non-linear (class C) strictly for FM/CW only.

CW is 100% modulation of a carrier by a rectangular wave, so the
harmonics associated with rise and fall times create at least as much
distortion as SSB. That distortion shows up in the form of clicky
sidebands. It's quite easy to see these sidebands on a P3. Here's some
work I did a year or two ago measuring some rigs that were available to me.

http://k9yc.com/P3_Spectrum_Measurements.pdf

The second file contains much of the same data, but focuses on
improvements made by firmware upgrades to the FTDX5000 a year or two ago.

http://k9yc.com/FTDX5000_Report.pdf

73, Jim K9YC

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[Elecraft mailing list]

If anyone needs information on the older KLM/Mirage amplifiers, I have some of the original documentation when I was at KLM/Mirage in the '70/'80 time period. Would be glad to share.

Mel, K6KBEOne of the founders of KLM Electronics


      From: Jim Brown <[hidden email]>
 To: [hidden email]
 Sent: Friday, July 29, 2016 12:15 PM
 Subject: Re: [Elecraft] KX3 2m external amplifier
   
On Fri,7/29/2016 10:31 AM, Ron D'Eau Claire wrote:
> Are those capable of linear operation for SSB as the poster asked? The ones
> I had back then were non-linear (class C) strictly for FM/CW only.

CW is 100% modulation of a carrier by a rectangular wave, so the
harmonics associated with rise and fall times create at least as much
distortion as SSB. That distortion shows up in the form of clicky
sidebands. It's quite easy to see these sidebands on a P3. Here's some
work I did a year or two ago measuring some rigs that were available to me.

http://k9yc.com/P3_Spectrum_Measurements.pdf

The second file contains much of the same data, but focuses on
improvements made by firmware upgrades to the FTDX5000 a year or two ago.

http://k9yc.com/FTDX5000_Report.pdf

73, Jim K9YC

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[Jim Brown-10]

That would be great, Mel.

I think I probably have about 8 brick amps of this generation carrying
the Mirage and RF Concepts nameplate. Up to now, I've never looked at
their spectral performance, and I don't have an easy way to do so with
the frequency resolution of the P3, because I have only one 2M CW
transceiver. OTOH, I could probably borrow a second one from W6GJB.

The most practical test I currently know of for IM performance is
transmitting CW dits in the range of 35WPM and looking at the occupied
bandwidth on a P3 with a display bandwidth on the order of 10 kHz.

73, Jim

On Fri,7/29/2016 12:57 PM, Mel Farrer wrote:

> If anyone needs information on the older KLM/Mirage amplifiers, I have
> some of the original documentation when I was at KLM/Mirage in the
> '70/'80 time period. Would be glad to share.
>
> Mel, K6KBE
> One of the founders of KLM Electronics
>
>
> ------------------------------------------------------------------------
> *From:* Jim Brown <[hidden email]>
> *To:* [hidden email]
> *Sent:* Friday, July 29, 2016 12:15 PM
> *Subject:* Re: [Elecraft] KX3 2m external amplifier
>
> On Fri,7/29/2016 10:31 AM, Ron D'Eau Claire wrote:
> > Are those capable of linear operation for SSB as the poster asked?
> The ones
> > I had back then were non-linear (class C) strictly for FM/CW only.
>
> CW is 100% modulation of a carrier by a rectangular wave, so the
> harmonics associated with rise and fall times create at least as much
> distortion as SSB. That distortion shows up in the form of clicky
> sidebands. It's quite easy to see these sidebands on a P3. Here's some
> work I did a year or two ago measuring some rigs that were available
> to me.
>
> http://k9yc.com/P3_Spectrum_Measurements.pdf
>
> The second file contains much of the same data, but focuses on
> improvements made by firmware upgrades to the FTDX5000 a year or two ago.
>
> http://k9yc.com/FTDX5000_Report.pdf
>
>
> 73, Jim K9YC
>
> ______________________________________________________________
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>
> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email] <mailto:[hidden email]>
>
>

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[Petr, OK1RP/M0SIS]

Dear Tim

where did you bought these 320Gs please? I am looking for them too but no
luck here in EU.

Thanks,



-----
73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
G+:http://goo.gl/w3u2s9
G+: http://goo.gl/gP99xq
--
Sent from: http://elecraft.365791.n2.nabble.com/
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