Power amplifier for K2
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For those who don't want to wait for the Elecraft linear amplifiers, here
is an option that I pursued. I bought a Tokyo Hi-power amplifier the HL 1.2KFS that is rated at 750 watts output with typically 60 watts drive. But here is what I did, I asked Nobuki San, the chief engineer, to set up the amplifier to work with the K2 at 10 watts drive. He did this and now I get an easy 600 watts output. The amp uses 4 SD2933 power FET transistors. Since the transistor gain at 30 MHz is typically 23 dB, I knew that my little K2 could drive the amplifier nicely. He also included a second input attenuator so I can restore it to normal configuration and a special K2 keying interface at no extra charge. Nobuki San tested my amplifier using a K2 showing 10 watts CW in and 600 watts CW out.( I have a picture) The build quality is excellent. The protection circuits are bullet proof. Since each transistor is rated at 300 watts, the parts are loafing at 600 watts out. Operation is from 160 M through 10 M. I had it shipped air express direct from Japan and had it in 4 days at my house including the delay in customs. I believe the price will be comparable or better than the Elecraft amplifiers especially since you don't need KPA 100 amplifier in between the K2 and the amplifier. See my review at e-ham net. Just my $.02 worth Rich W3ACO _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I also like the Tokyo Hy-Power amps. I have the HL200Bdx and it has worked
wonderfully well with my K2. Also, Nobuki San is a pleasure to work with. These amps cost more than you typical CB type amp, like the RM Italy models, but are worth it and are true amateur band amps with proper band selection and filtering. I recommend them. 73, Bill - WA5PB -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Richard haendel Sent: Sunday, November 19, 2006 7:57 AM To: [hidden email] Subject: [Elecraft] Power amplifier for K2 For those who don't want to wait for the Elecraft linear amplifiers, here is an option that I pursued. I bought a Tokyo Hi-power amplifier the HL 1.2KFS that is rated at 750 watts output with typically 60 watts drive. But here is what I did, I asked Nobuki San, the chief engineer, to set up the amplifier to work with the K2 at 10 watts drive. He did this and now I get an easy 600 watts output. The amp uses 4 SD2933 power FET transistors. Since the transistor gain at 30 MHz is typically 23 dB, I knew that my little K2 could drive the amplifier nicely. He also included a second input attenuator so I can restore it to normal configuration and a special K2 keying interface at no extra charge. Nobuki San tested my amplifier using a K2 showing 10 watts CW in and 600 watts CW out.( I have a picture) The build quality is excellent. The protection circuits are bullet proof. Since each transistor is rated at 300 watts, the parts are loafing at 600 watts out. Operation is from 160 M through 10 M. I had it shipped air express direct from Japan and had it in 4 days at my house including the delay in customs. I believe the price will be comparable or better than the Elecraft amplifiers especially since you don't need KPA 100 amplifier in between the K2 and the amplifier. See my review at e-ham net. Just my $.02 worth Rich W3ACO _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.430 / Virus Database: 268.14.7/538 - Release Date: 11/18/2006 4:48 PM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Richard Haendel
Richard haendel wrote:
> For those who don't want to wait for the Elecraft linear amplifiers, here > is an option that I pursued. I bought a Tokyo Hi-power amplifier the HL > 1.2KFS that is rated at 750 watts output with typically 60 watts drive. But > here is what I did, I asked Nobuki San, the chief engineer, to set up the > amplifier to work with the K2 at 10 watts drive. He did this and now I get > an easy 600 watts output. The amp uses 4 SD2933 power FET transistors. Since > the transistor gain at 30 MHz is typically 23 dB, I knew that my little K2 > could drive the amplifier nicely. Unfortunately, he can't legally sell such a model in the US. There's an FCC rule that the gain of an amateur service amplifier can't exceed 16 dB. Of course, it is permissible for a licensed amateur to modify a commercial amplifier for his own use, as long as it meets purity/stability standards. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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