KPA-1500: Gain Mod when FCC Lifts 15db Rule
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KPA-1500: Gain Mod when FCC Lifts 15db Rule
 
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So if and when the FCC lifts the 15db gain rule, will there be a mod
available to increase the gain capability so a KX3 or KX2 could drive this bad boy? Rich - N5ZC ______________________________________________________________ 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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Administrator
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TBD.
Wayne N6KR > On Apr 21, 2017, at 3:43 AM, Richard Thorne <[hidden email]> wrote: > > So if and when the FCC lifts the 15db gain rule, will there be a mod available to increase the gain capability so a KX3 or KX2 could drive this bad boy? > > Rich - N5ZC > ______________________________________________________________ > 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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In reply to this post by Richard Thorne-4
Excellent question.
Do not expect an authoritative answer until AFTER the ink is dry on the gain limited approval from the FCC. ;-) ______________________ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 4/21/2017 5:43 AM, Richard Thorne wrote: > So if and when the FCC lifts the 15db gain rule, will there be a mod > available to increase the gain capability so a KX3 or KX2 could drive > this bad boy? > > Rich - N5ZC ______________________________________________________________ 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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In reply to this post by Richard Thorne-4
As I understand the way things work, they will not get approval for the
device, if it is easily modifiable to defeat the current limit, so I would expect them to play down any modifiability even if it can't be classed as easy. -- David Woolley K2 06123 On 21/04/17 11:43, Richard Thorne wrote: > So if and when the FCC lifts the 15db gain rule, will there be a mod > available to increase the gain capability so a KX3 or KX2 could drive > this bad boy? > ______________________________________________________________ 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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In reply to this post by wayne burdick
PLEASE do it!
Don't "punish" everybody outside the U.S. where this stupid limit never existed! Thanks, Olli - DH8BQA Am 21.04.17 um 18:01 schrieb Wayne Burdick: > TBD. > > Wayne > N6KR > > >> On Apr 21, 2017, at 3:43 AM, Richard Thorne <[hidden email]> wrote: >> >> So if and when the FCC lifts the 15db gain rule, will there be a mod available to increase the gain capability so a KX3 or KX2 could drive this bad boy? >> >> Rich - N5ZC >> ______________________________________________________________ >> 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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In reply to this post by Richard Thorne-4
On 2017-04-21 06:43 AM, Richard Thorne wrote:
> So if and when the FCC lifts the 15db gain rule For those of us not in the US and subject to FCC rules, what is the FCC 15dB rule? -- Cheers! Kevin. http://www.ve3syb.ca/ |"Nerds make the shiny things that distract Owner of Elecraft K2 #2172 | the mouth-breathers, and that's why we're | powerful!" #include <disclaimer/favourite> | --Chris Hardwick ______________________________________________________________ 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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It is a rule that an amplifier in the HF bands cannot have more than 15
db gain. This is because stupid people do stupid things here (and I'm sure elsewhere too). So it was simpler to block everyone, then stop some. Rick nhc On 4/21/2017 2:51 PM, Kevin Cozens wrote: > On 2017-04-21 06:43 AM, Richard Thorne wrote: >> So if and when the FCC lifts the 15db gain rule > > For those of us not in the US and subject to FCC rules, what is the > FCC 15dB rule? > ______________________________________________________________ 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] |
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This is correct.
On 4/21/2017 5:00 PM, Rick WA6NHC wrote: > It is a rule that an amplifier in the HF bands cannot have more than > 15 db gain. This is because stupid people do stupid things here (and > I'm sure elsewhere too). So it was simpler to block everyone, then > stop some. > > Rick nhc > > > On 4/21/2017 2:51 PM, Kevin Cozens wrote: >> On 2017-04-21 06:43 AM, Richard Thorne wrote: >>> So if and when the FCC lifts the 15db gain rule >> >> For those of us not in the US and subject to FCC rules, what is the >> FCC 15dB rule? >> > > ______________________________________________________________ > 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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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In reply to this post by Richard Thorne-4
A little more background for the FCC (USA) gain restriction for HF amplifiers:
I believe that was a result of wanting to stymie CB use of ham amplifiers using 5-15w drive. 15-dB for 1500w implies 47w min drive. The LDMOS being used for 1200w on 2m only require 3-4w drive; that is 26-dB gain! Likely the devices chosen by Elecraft for their KPA1500 have similar gain so they install attenuation into the drive path or change bias to lower gain (or both). My guess once the schematic is available any non-USA ham can bypass the input to enable lower drive requirements. A KX2 or KX3 ought to suffice. Of course this would violate warrantee. On a similar thought process, now that the KX3 is capable of 15w, I'm wondering if driving the KXPA100 harder than 8w will result in higher output? Would it be safe to do? I'm thinking 10w/100w. The KXPA100 I have drives easily to 110w saturated with about 4-5w on 80-15m, but requires 8w to achieve 70-80w at 6m. 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: [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] |
Re: KPA-1500: Gain Mod when FCC Lifts 15db Rule
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“any non-USA ham can bypass the input to enable lower drive
requirements.” Legal for US hams also. Restriction is just on the manufacturer. You are responsible for your equipment. My KPA500s are modified for lower drive (thanks to NX1P who did the hard work) so that I can drive two in parallel. Ken K6MR From: Edward R Cole<mailto:[hidden email]> Sent: Friday, April 21, 2017 5:03 PM To: Elecraft Reflector<mailto:[hidden email]> Subject: Re: [Elecraft] KPA-1500: Gain Mod when FCC Lifts 15db Rule A little more background for the FCC (USA) gain restriction for HF amplifiers: I believe that was a result of wanting to stymie CB use of ham amplifiers using 5-15w drive. 15-dB for 1500w implies 47w min drive. The LDMOS being used for 1200w on 2m only require 3-4w drive; that is 26-dB gain! Likely the devices chosen by Elecraft for their KPA1500 have similar gain so they install attenuation into the drive path or change bias to lower gain (or both). My guess once the schematic is available any non-USA ham can bypass the input to enable lower drive requirements. A KX2 or KX3 ought to suffice. Of course this would violate warrantee. On a similar thought process, now that the KX3 is capable of 15w, I'm wondering if driving the KXPA100 harder than 8w will result in higher output? Would it be safe to do? I'm thinking 10w/100w. The KXPA100 I have drives easily to 110w saturated with about 4-5w on 80-15m, but requires 8w to achieve 70-80w at 6m. 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: [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] |
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